# A Review of Necrotauliids from the Triassic/Jurassic of England (Trichoptera: Necrotauliidae)

Authors: Richard S. Kelly; Andrew J. Ross; Robert A. Coram
Journal: Psyche
 (2018)

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## Abstract

Species previously attributed to Necrotauliidae are revised from the Late Triassic and Early Jurassic of England based on examination of type specimens and non-type material. The necrotauliids have been considered as a basal family of caddisflies (Trichoptera) or as a paraphyletic assemblage of stem-amphiesmenopterans. Herein a new genus,Austaulius, is erected which includes all Lilstock Formation∖Lower Lias material from England; the previously described species are synonymized withA. furcatus and a new species,A. haustrum, is described from the Dorset Coast, the holotype of which preserves synapomorphic traits of the Trichoptera not previously described suggesting that the family is trichopteran. The type genus remainsNecrotaulius and type speciesN. parvulus (Geinitz, 1884) from the type locality of Dobbertin, Germany. One species ofNecrotaulius is represented in the UK,N. parvulus, which is found in the Upper Lias.


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## Body

## 1. Introduction

Trichoptera (caddisflies) are a relatively small order of insects with 13,000 living species [1] and 642 fossil species according to Morse [2]. Although more fossil species have been described since, for example, [3], the online Palaeobiology Database (PBDB—http://fossilworks.org) lists 553 valid species. Adults have a similar morphology to moths, highlighting their close relationship with the Lepidoptera. However, whereas Lepidoptera (“scale-winged”) have a layer of scales on their wings, Trichoptera (“hairy-winged”) usually have a layer of hairs, but there are exceptions and some caddisflies are known to have scales [4]. Most larvae are aquatic although some can be semiaquatic or terrestrial and they are among the few insects to have radiated into the marine realm [5]. Trichopterans from the early Mesozoic are usually preserved as isolated wings and are difficult to distinguish from early Lepidoptera and stem-Amphiesmenoptera.Trichoptera and Lepidoptera evolved from stem-Amphiesmenoptera early in the Mesozoic [6] with the extinct family Necrotauliidae filling an undefined space within or between the stem-Amphiesmenoptera and the evolving Lepidoptera and Trichoptera. The family Necrotauliidae was erected by Handlirsch [7], who described the genusNecrotaulius with seven species, five of which were new, plus two British species named by Giebel [8] that were transferred from the mecopteran (scorpionfly) genusOrthophlebia, and the genusMesotrichopteridium with one species,M. pusillum. Tillyard [9] madeN. liasinus (Giebel) a junior synonym ofN. furcatus (Giebel) and described four new species:N. westwoodi, N. stigmaticus, N. apicalis, andN. pygmaeus, from British material. Handlirsch [10] added 10 new species from the Upper Lias (Toarcian) of Germany. He named one species asN. pygmaeus, but this was identified as a homonym and renamedN. ulmeri [11]. Ansorge [12] transferredN. parvulus (Geinitz) from the genusOrthophlebia and madeN. pygmaeus Tillyard, 1933, a junior synonym. OnlyNecrotaulius has been hitherto described from the Triassic/Jurassic of England.Necrotauliidae has been described as a paraphyletic assemblage of species containing basal Trichoptera, basal Lepidoptera, and advanced stem-Amphiesmenoptera [6, 13]. A revision of the German Upper Lias (Toarcian) material was carried out by Ansorge [12, 14] and several major taxonomic changes were proposed including removing Necrotauliidae from Trichoptera completely. Previously named species within the family from Germany were restricted toN. parvulus andMesotrichopteridium intermedium and it was suggested that the latter may not be a necrotauliid [12] but that the Lower Jurassic material from England and Kyrgyzstan needed revising first to properly understand affinities. The genus was likened toProrhyacophila (in Prorhyacophilidae Riek as per [15]) and although the holotype was not examined it was suggested thatProrhyacophila was a junior synonym ofMesotrichopteridium. The following genera were considered as Lepidoptera by Ansorge [12]:Archiptilia Handlirsch;Epididontus Handlirsch;Metarchitaulius Handlirsch;Nannotrichopteron Handlirsch;Palaeotaulius Handlirsch;Pararchitaulius Handlirsch;Parataulius Handlirsch;Paratrichopteridium Handlirsch; andPseudorthophlebia Handlirsch. It was reiterated by Ansorge [14] thatArchiptilia,Nannotrichopteron,Pararchitaulius,Parataulius, andPseudorthophlebia were Lepidoptera because they had scales on the wing surface, and thatParatrichopteridium was either a hindwing ofLiadotaulius or belonged to Lepidoptera. They were all subsequently listed as polyphyletic Necrotauliidae under Lepidoptera [16].?N. maior, ?Paratrichopteridium areatum, Liadotaulius acutipennis, P. breve, and?P. angustum were synonymized withLiadotaulius maior[12] and it was proposed that this was the oldest known true trichopteran with uncertain familial taxonomy. The genus was provisionally placed in Philopotamidae [17] based on similarities in forewing venation and additional species have been included [18]. A possible philopotamid was described from the Ladinian∖Carnian of Madygen, Kyrgyzstan, and prorhyacophilids and necrotauliids have also been described from this locality; thus these are potentially the oldest true Trichoptera (see [19]).The genusAcisarcuatus was described from the Middle Jurassic of China and placed in the Necrotauliidae [20]. The authors were able to include body characteristics which they suggested supported the family’s placement in the Trichoptera. The specimen is well preserved, showing genitalia and maxillary palps, and [20] suggested that the presence of harpagones (“claspers”) is a synapomorphy of Trichoptera, citing [21, 22]. Both papers do mention the presence of harpagones but neither indicate that this is synapomorphic for the Trichoptera. Even if they meant that the form of the harpagones was synapomorphic (regularly curving towards the middle, narrowing at apex), this would still not be a true synapomorphy as this character is also recorded in other orders such as Diptera [23] and Raphidioptera [24]. Also, multiple variations including 1-segmented and 2-segmented forms and forms which are narrower at the base have been recorded in Trichoptera [22].The main issue with the higher taxonomy of Trichoptera is that much of the classification is based on larval morphology of extant species. Several characters have been proposed as synapomorphies for Trichoptera and these are listed by Holzenthal et al. [22] as follows: larvae aquatic and apneustic (no open spiracles) so respiration is epidermal, often by filamentous abdominal gills; larval tentorium reduced; larval antennae greatly reduced; larval abdominal segments 1–9 are without ventral prolegs; larval abdominal segment 9 is with dorsal tergite. Only one character was listed as being synapomorphic for adults: the formation of a haustellum, a modified form of mouthparts not seen in any other order. Other authors agree that the haustellum as found in Trichoptera is the only unequivocal autapomorphy of adult Trichoptera [25]. A similar structure is found in in the non-Glossatan Lepidoptera and is assumed to be present in Tarachoptera, but it is small and not visible externally [26]. The haustellum has not previously been reported in any specimen of necrotauliid; coupled with the similarity of wing venation with other basal amphiesmenopterans it has been difficult to say with any degree of certainty whether Necrotauliidae do belong to Trichoptera [18, 20] or are stem-amphiesmenopterans [12, 14].There is a forewing venation character which has been proposed as diagnostic of the Trichoptera, the CuP tip desclerotised and abruptly bending towards the posterior margin [12]. Kristensen [27] noted the character as potentially important for indicating whether an amphiesmenopteran of uncertain affinity was of the trichopteran lineage or not, but it is not a synapomorphy and is limited in its diagnostic use as it is homoplasious, having evolved separately in different lineages of Trichoptera, some mecopterans (e.g., Bittacidae), and some basal Mecopterida (Microptysmatidae). Not all extant Trichoptera demonstrate this and a curved CuP can also be seen in some species of micro moths (see [28]); thus we do not regard it as a reliable character for separating Trichoptera from Lepidoptera.Also listed by Liu et al. [20] wereNecropsis Hong andKaratauliodes Sukatsheva; however the former was regarded as belonging to Mecoptera and the latter was designated as a junior synonym ofNecrotaulius [18]. Zhang et al. [18] also described a new species ofAcisarcuatus and listed the following additional genera within the Necrotauliidae:Cretotaulius Sukatsheva;Karataulius Sukatsheva;Mesotrichopteridium Handlirsch;Necrotaulius Handlirsch;Pteromixanum Sukatsheva and Jarzembowski; andScyphindusia Sukatsheva. Of these the latter is based on a larval case so is not useful for a discussion on wings. Carpenter [29] also listedLiadoptilia Handlirsch,Liadotaulius Handlirsch, andPhryganeidium Westwood; however,Liadoptilia was regarded as unplaced in Amphiesmenoptera [12] andLiadotaulius was tentatively regarded as belonging to the Philopotamidae [18].Phryganeidium Westwood (erected forP. pytho Westwood, 1854 [30] from the Lower Cretaceous of Dorset, UK) has been confused withPhryganidium Geinitz (erected forP. balticum Geinitz, 1880 [31] from the Lower Jurassic of Germany). It is possible that Geinitz misspelt Westwood’s genus, and subsequentlyP. pytho was listed underPhryganidium by Scudder (1891, p. 161) [32]. However, Geinitz does not refer to Westwood under the description ofP. balticum, even though he refers to other trichopteran specimens figured in Brodie, 1845 [33] (“Orthophlebia” furcata andliasina), and he does refer to Westwood when discussing other new species in the same paper. Geinitz said “Unfortunately, I lack both the necessary literature and a comparative collection of living insects, and for the time being I have to be modest in using the general family namePhryganidium for this genus.” This is ambiguous but does not rule out that he was not erecting a new name, and he erects other new generic names in the same paper but does not indicate that they are new.P. balticum was moved to the hemipteran genusFulgoridium Handlirsch by Handlirsch (1907, p. 496) [7], where it still resides [34]; andP. pytho was placed in the Jurassic trichopteran genusMesotrichopteridium Handlirsch by Handlirsch (1907, p. 616) [7].P. pytho is still a valid species and although Westwood’s figures are generally unreliable, his figure of the holotype (pl. 18, Figure 31) clearly shows far fewer branches thanFulgoridium and it differs fromMesotrichopteridium in having a branched R1. Thus, we regardPhryganidium Geinitz (type speciesP. balticum) as a junior synonym ofFulgoridium within the order Hemiptera andPhryganeidium Westwood (type speciesP. pytho) as a valid genus within the order Trichoptera.Phryganeidium pythohas a branched R1 which rejects the species from the Necrotauliidae according to the emended diagnosis provided below. It clearly needs to be redescribed and until that happens we regard it as Trichoptera: family uncertain.Herein we revise the taxonomy of Late Triassic and Early Jurassic Necrotauliidae from England. Most of these specimens are isolated wings, but several do preserve other body parts including one specimen from the Sinemurian of Dorset in which an external haustellum is preserved suggesting that the Necrotauliidae are trichopterans and not stem-Amphiesmenoptera. A new genus was also found, and although it is imperative to distinguish it from all the other genera listed above, a detailed redescription of these taxa is beyond the scope of this study. A robust definition for the Necrotauliidae based primarily on the type genusNecrotaulius is required and we have attempted to supply this based on the examination of some holotypes and non-holotype material and published descriptions. All known species of Necrotauliidae are listed in Table 1 as are the species previously associated with Necrotauliidae but are now excluded.Table 1
Known species of Necrotauliidae and previous species now associated with the lepidopteran lineage. T3: Late Triassic; J1: Early Jurassic; J2: Middle Jurassic; J3: Late Jurassic; K1: Early Cretaceous.
Genus
Species
Author
Age
Locality
Trichoptera: Necrotauliidae
Acisarcuatus
locellatus
Zhang et al., 2016
J2
Daohugou, China
Acisarcuatus
variradius
Liu et al., 2014
J2
Daohugou, China
Austaulius
furcatus
(Giebel, 1856)
T3
Aust Cliff, UK
Austaulius
haustrum
sp. nov.
J1
Monmouth Beach, UK
Cretotaulius
ultimus
Sukatsheva, 1982
J3
Unda, Russia
Karataulius
aeternus
Sukatsheva, 1968
J2/J3
Karatau, Kazakhstan
Mesotrichopteridium
intermedium
(Handlirsch, 1907)
J1
Dobbertin, Germany
Necrotaulius
fascialatus
Hong, 1983
J2
Xiaofanzhangzi, China
Necrotaulius
kritus
Lin, 1986
J3
Zhongshan, China
Necrotaulius
kubekovi
Sukatsheva, 1985
J2
Kubekovo, Russia
Necrotaulius
mantellorum
Jarzembowski, 1991
K1
Capel, UK
Necrotaulius
minutissimus
Sukatsheva, 1990
J3
Daya, Russia
Necrotaulius
minutus
(Sukatsheva, 1968)
J2/J3
Karatau, Kazakhstan
Necrotaulius
parvulus
(Geinitz, 1884)
J1
Dobbertin, Germany
Necrotaulius
proximus
Sukatsheva, 1973
T2/T3
Madygen, Kyrgyzstan
Necrotaulius
qingshilaense
Hong, 1984
K1
Shidongzi, China
Necrotaulius
tener
Sukatsheva, 1990
J3
Unda, Russia
Prorhyacophila
colliveri
Riek, 1955
T3
Mt. Crosby, Australia
Prorhyacophila
furcata
Sukatsheva, 1973
T2/T3
Madygen, Kyrgyzstan
Pteromixanum
inviolatum
Sukatsheva & Jarzembowski, 2001
K1
Durlston Bay, UK
Pteromixanum
poxwellense
Sukatsheva & Jarzembowski, 2001
K1
Poxwell, UK
Pteromixanum
purbeckianum
Sukatsheva & Jarzembowski, 2001
K1
Durlston Bay, UK
Pteromixanum
ruderatum
Sukatsheva & Jarzembowski, 2001
K1
Durlston Bay, UK
Scyphindusia
hydroptiliformis
Sukatsheva, 1985
J2/J3
Bolshoy, Russia
Trichoptera: family uncertain
Phryganeidium
pytho
Westwood, 1854
K1
Durlston Bay, UK
Lepidoptera: family uncertain
Architipula
ovata
Handlirsch, 1939
J1
Dobbertin, Germany
Epididontus
geinitzianus
Handlirsch, 1939
J1
Dobbertin, Germany
Metarchitaulius
longus
Handlirsch, 1939
J1
Dobbertin, Germany
Nannotrichopteron
gracile
Handlirsch, 1907
J1
Dobbertin, Germany
Palaeotaulius
vicinus
Handlirsch, 1939
J1
Dobbertin, Germany
Pararchitaulius
ovalis
Handlirsch, 1939
J1
Dobbertin, Germany
Parataulius
jurassicus
Handlirsch, 1939
J1
Dobbertin, Germany
Pseudorthophlebia
platyptera
Handlirsch, 1907
J1
Dobbertin, Germany
Amphiesmenoptera
Paratrichopteridium
efossum
Handlirsch, 1939
J1
Dobbertin, Germany
Paratrichopteridium
costale
Handlirsch, 1939
J1
Dobbertin, Germany


## 2. Materials and Methods

There are 57 specimens identified as Necrotauliidae from the Upper Triassic and Lower Jurassic of Britain, all from England. 22 of these are held at the Natural History Museum, London (NHMUK), 15 of which are in the collection of Rev. Peter Bellinger Brodie, two were collected by Edmund Jarzembowski, two by Sydney Buckman, one by David Sole, and two more recently by RAC; 13 are held at the Yorkshire Museum, York (YORYM), all of which are in the Brodie collection; one is held at the Oxford University Museum of Natural History (OUMNH) from the Rev. Hope collection; one is held at the Somerset Heritage Centre for Taunton Museum (TTNCM) from the Charles Moore collection. Additional material was examined from the Paleontological Institute of the Russian Academy of Sciences, Moscow (PIN), the Ernst-Moritz-Arndt Universität, Greifswald (EMAUG), and the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences (NIGPAS).All specimens were examined first-hand by the primary author except where specifically stated. Examinations were carried out using a light microscope (different model at each museum) and photographs were taken with a digital camera attached to a Leica microscope where possible, or with a Nikon D3300 with AF-S Micro Nikkor 40 mm macro lens attached to a stand. Light sources were altered and applied at various angles to capture as much of the preserved venation as possible and where applicable alcohol was used to further highlight venation. Drawings were made from photographs using the Serif DrawPlus X6 graphics package. The locality map (Figure1) was plotted on the “light grey standard” base map in ArcGIS desktop 10.0; design alterations were made in Serif DrawPlus X6.Figure 1
Locality map. (1) Blue Anchor, (2) Aust Cliff, (3) Wainlode Cliff, (4) Apperley, (5) Forthampton, (6) Brockeridge, (7) Brown’s Wood, (8) Binton, (9) Copt Heath, (10) Monmouth Beach, (11) Ilminster, and (12) Alderton Hill/Dumbleton Pit.


### 2.1. Nomenclatural Acts

The new names contained in this article are available under the International Code of Zoological Nomenclature. This work and the nomenclatural acts it contains have been registered in ZooBank. ZooBank Life Science Identifier (LSID) for this publication is: urn:lsid:zoobank.org:pub: 7528E2B8-E53D-4395-A73F-BAFD3F5A20AF. The LSID registration and any associated information can be viewed in a web browser by adding the LSID to the prefix “http://zoobank.org/.”


## 2.1. Nomenclatural Acts

The new names contained in this article are available under the International Code of Zoological Nomenclature. This work and the nomenclatural acts it contains have been registered in ZooBank. ZooBank Life Science Identifier (LSID) for this publication is: urn:lsid:zoobank.org:pub: 7528E2B8-E53D-4395-A73F-BAFD3F5A20AF. The LSID registration and any associated information can be viewed in a web browser by adding the LSID to the prefix “http://zoobank.org/.”


## 3. Localities and Ages

Necrotauliids have been collected from 12 localities in the UK all of which are found in England (Figure1). Most of these localities (those that are inland) are historical and have not been collected from for over 100 years. The literature for the stratigraphy of the insect bearing horizons is equally outdated and so we aim to update the ages of these historical localities to current geological nomenclature. The Rhaetian localities of Brown’s Wood, Warwickshire and Apperley, Forthampton, and Wainlode Cliff (Gloucestershire) along with the Hettangian localities of Binton (Warwickshire) and Copt Heath (Birmingham) and the Toarcian locality of Strawberry Bank, Ilminster (Somerset), were previously discussed [35]. The Rhaetian localities of Aust Cliff and Brockeridge (Gloucestershire) and the Sinemurian locality of Monmouth Beach, Lyme Regis (Dorset) were also previously discussed [36]. The localities not previously discussed are described below.


### 3.1.Blue Anchor, Somerset [National Grid Reference ST 033 435] (Rhaetian)

A section at this coastal locality was described and figured by Hauser and Martill [37] showing the succession from the Norian Mercia Mudstone Formation through the entire Rhaetian and into the Lower Lias Blue Lias Formation at the top of the cliff. This is the type locality for the lower Rhaetian Blue Anchor Formation [38]. Several insects have been collected from this site by RAC from loose rocks on the foreshore which are consistent with the limestones of the Cotham Member of the Lilstock Formation.


### 3.2. Dumbleton/Alderton, Gloucestershire [SP 006 345] (Toarcian)

There are several hills in Gloucestershire from which Toarcian aged insects have been collected and the most productive are in the Dumbleton-Alderton area, although there has been some confusion over the names of the locality/ies. “Dumbleton” and “Alderton” have been described as separate localities [33] but this is not the case even though there are two hills in the area, “Alderton Hill” and “Dumbleton Hill.” After seeking consultation from Michael Simms, a geologist local to the area, Palmer [39] treated them as the same locality, indicating that “Dumbleton pit” was not actually on Dumbleton Hill and was only 100 m away from “Alderton Hill quarry.” Either way the insect horizon in both the pit and the quarry occupy the same stratigraphic position. Alderton/Dumbleton is a well-known locality for insects from the lower Toarcian fish beds (“Fish and insect beds”, “Saurian and fish beds”) which are found in the Whitby Mudstone Formation [40]. The fish beds are described as laminated limestone nodules overlaying paper shales [41] and are contiguous with the fish beds found at Ilminster [42] being found in thefalciferum Ammonite Zone.


## 3.1.Blue Anchor, Somerset [National Grid Reference ST 033 435] (Rhaetian)

A section at this coastal locality was described and figured by Hauser and Martill [37] showing the succession from the Norian Mercia Mudstone Formation through the entire Rhaetian and into the Lower Lias Blue Lias Formation at the top of the cliff. This is the type locality for the lower Rhaetian Blue Anchor Formation [38]. Several insects have been collected from this site by RAC from loose rocks on the foreshore which are consistent with the limestones of the Cotham Member of the Lilstock Formation.


## 3.2. Dumbleton/Alderton, Gloucestershire [SP 006 345] (Toarcian)

There are several hills in Gloucestershire from which Toarcian aged insects have been collected and the most productive are in the Dumbleton-Alderton area, although there has been some confusion over the names of the locality/ies. “Dumbleton” and “Alderton” have been described as separate localities [33] but this is not the case even though there are two hills in the area, “Alderton Hill” and “Dumbleton Hill.” After seeking consultation from Michael Simms, a geologist local to the area, Palmer [39] treated them as the same locality, indicating that “Dumbleton pit” was not actually on Dumbleton Hill and was only 100 m away from “Alderton Hill quarry.” Either way the insect horizon in both the pit and the quarry occupy the same stratigraphic position. Alderton/Dumbleton is a well-known locality for insects from the lower Toarcian fish beds (“Fish and insect beds”, “Saurian and fish beds”) which are found in the Whitby Mudstone Formation [40]. The fish beds are described as laminated limestone nodules overlaying paper shales [41] and are contiguous with the fish beds found at Ilminster [42] being found in thefalciferum Ammonite Zone.


## 4. Systematic Palaeontology

Superorder Amphiesmenoptera Kiriakoff, 1948 [43]
Order Trichoptera Kirby, 1813 [44]
Family Necrotauliidae Handlirsch, 1907 [7]
=Prorhyacophilidae Riek, 1955 [45]Emended Diagnosis. Forewings with the following combination of characters: R1 simple; Rs with two forks (each with two branches); M with two forks (each with two branches); CuA forked; m-cu cross-vein (or base of CuA) present; anal veins 2 and 3 merge, then merge with A1 which terminates on the posterior margin. In hindwing, MP simple and anal veins are simple, terminating on the posterior margin. Hairs present on forewing and around wing-margins of both fore- and hindwings (if preserved).Discussion. Ansorge [12] consideredProrhyacophila a junior synonym ofMesotrichopteridium; however this has not been followed by others. Certainly, from the diagnosis provided above it is not possible to exclude the type speciesProrhyacophila colliveri Riek, 1955 from the Necrotauliidae; thus the family Prorhyacophilidae needs to be regarded as a junior synonym.Prorhyacophila andMesotrichopteridium differ in the positions of cross-veins so are kept separate here. The Permian speciesProrhyacophila rasnitsyni Sukatsheva & Aristov, 2013 in [15, Figure 68(e)] has a branched R1 thus it is rejected from the Necrotauliidae andProrhyacophila.Description. In addition to the diagnosis of the forewing Sc is either simple or with one or two anterior oblique branches; Sc-r, r-m, m-cua, cua-cup, and a1-a2 cross-veins may be present, though may not be visible on poorly preserved specimens.Remarks. Hairs are not always preserved as most specimens are not well preserved but there are examples of bothNecrotaulius andAustaulius with hairs (Figures 2(b)–2(d)). The family is extinct and only known from the Triassic to Cretaceous but as only preserved characters can be included in the diagnosis there may be superficial similarity with some extant taxa.GenusNecrotaulius Handlirsch [7]Figure 2
Two examples of necrotauliid wings with hairs and labial palps: (a)Necrotaulius tener Sukatsheva, 1990 from Daya, Russia (PIN 3015/819); (b) hairs; (c) labial palps; (d)Austaulius furcatus (NHMUK II 3104 a); (e) counterpart NHMUK II 3104 b; (f) hairs on NHMUK II 3104 b magnified.Type Species. Necrotaulius parvulus (Geinitz, 1884) [46]Emended Diagnosis. Sc simple, r-m cross-vein absent, CuA connected by “Y-shape” to M and CuP; labial palps longer, second segment more elongate than first or third (Figure 2(c)).Remarks. The apex of CuP does not seem to be desclerotised in the British specimens of this genus and more gently curves towards the posterior marginNecrotaulius parvulus (Geinitz, 1884) [46]Holotype. EMAUG 119/7 (see [12]) from the Falciferum Chronozone of the Posidonia Shale Formation (lower Toarcian), Schwinz near Dobbertin, Germany.Additional Material. See [12] for list of lower Toarcian German specimens. British Toarcian: NHMUK I.15014 (holotype ofNecrotaulius pygmaeus Tillyard, Figure 3) and I.11425, both Dumbleton and TTNCM 39/2011/0733, Ilminster, Somerset.Figure 3
Example of EnglishNecrotaulius parvulus (Geinitz, 1884), NHMUK I.15014 from Dumbleton pit, Gloucestershire (previous holotype ofNecrotaulius pygmaeus Tillyard, 1933). Scale bar = 1 mm.Remarks. The three British specimens match the diagnosis and description of this species as provided by Ansorge [12]. Sohn et al. [16] indicated that Ansorge [12] redefinedNecrotaulius to only include the type speciesN. dobbertinensis but this is incorrect. Ansorge designatedN. dobbertinensis a junior synonym ofN. parvulus based on the latter’s date priority.GenusAustauliusgen. nov.
urn:lsid:zoobank.org:act:D1FBC755-D8BD-45DA-9934-9C78F029DF8EType Species. Austaulius furcatus (Giebel, 1856) [8]Etymology. Aust- after the holotype locality for the type species, and-taulius after the suffix forNecrotaulius.Diagnosis. Sc with 1 anterior branch, r-m cross-vein absent, CuA fuses with M for a short distance near the base then with an oblique cross-vein connecting MP + CuA to CuP; labial palps shorter; second segment about same length as first segment (Figure 4).Figure 4
Holotype ofAustaulius furcatus (Giebel, 1856) from Aust Cliff, Gloucestershire. (a) YORYM YM 815; (b) NHMUK I.11522; (c) original holotype figure in Brodie (1845, pl. 9, Figure 16); (d) figure of “holotype” in Tillyard (1933, Figure 25). Scale bars = 1 mm.
(a)
(b)
(c)
(d)Remarks. Clearly the form of CuA was misinterpreted by Tillyard [9] and begs the question as to whether any otherNecrotaulius species have been misinterpreted. OtherNecrotaulius holotypes were checked in person by the senior author. The following do not possess the diagnostic form of CuA as seen inAustaulius:N. parvulus (Geinitz) (EMAUG 119/7) from the Upper Lias of Germany;N. kubekovi Sukatsheva (PIN 1255/193) from the Middle Jurassic of Russia;N. minutissimus Sukatsheva (PIN 3063/742),N. minutus (Sukatsheva) (PIN 2066/1303), andN. tener Sukatsheva (PIN 3015/819) (Figures 2(a)–2(c); also figured in [6], Figure 13.1 and [13], Figure 283) from the Late Jurassic of Russia and Kazakhstan andN. kritus Lin (NIGPAS 70078) from the Middle Jurassic of China.N. fascialatusHong andN. qingshilaense Hong were described from the Late Jurassic and Early Cretaceous of China, respectively. Unfortunately, it is not known where Hong’s holotypes are although researchers at NIGPAS have been searching for them (Wang Bo, pers. comm., 2016). Based on Hong’s figures it appears that the basal area of the wing is not preserved inN. fascialatus ([47], Figure 46); the character may be present inN. qingshilaense ([47], Figure 47) but it is not at all clear; the holotype would need to be examined.N. mantellorum Jarzembowski (Booth Museum, Brighton 014897/8) was described from the Early Cretaceous of England [48]. It requires reexamination to confirm whether it belongs toNecrotaulius or not. One specimen (NHMUK II 3104 a and b) was identified asAustaulius sp. indet. and is included because it preserves hair on the wings (Figures 2(d)–2(f)).Austaulius furcatus (Giebel, 1856) [8]comb. nov.
“Neuropterous insects” Westwood in Brodie (1845) [33], p. 127, pl. 9, Figures 16 and 17.
Orthophlebia furcata Giebel, 1856 [8] p. 261.
Orthophlebia liasina Giebel, 1856 [8] p. 261.
Orthophlebia furcata Giebel; Goss (1879) [49], p. 145.
Orthophlebia liasina Giebel; Goss (1879) [49], p. 145.
Orthophlebia furcata Giebel; Scudder (1891) [32], p. 156 (nos. 1024, 1025).
Orthophlebia liasina Giebel; Scudder (1891) [32], p. 157 (no. 1029).
Orthophlebia furcataGiebel; Woodward (1893) [50], p. 367.
Orthophlebia liasina Giebel; Woodward (1893) [50], p. 367.
Necrotaulius furcatus (Giebel); Handlirsch (1907) [7], p. 484, pl. 42, Figure 37.
Necrotaulius liasinus (Giebel); Handlirsch (1907) [7], p. 485, pl. 42, Figure 38.
Necrotaulius furcatus(Giebel); Tillyard (1933) [9], p. 62, Figures 23–25.
Necrotaulius stigmaticus Tillyard, 1933 [9], p. 65, Figure 27.syn. nov.
Necrotaulius westwoodi Tillyard, 1933 [9], pp. 64, 65, Figure 26.syn. nov.
Necrotaulius apicalis Tillyard, 1933 [9], p. 66, Figure 28.syn. nov.
Necrotaulius furcatus (Giebel); Willmann (1978) [51], p. 115.
Necrotaulius westwoodi Tillyard; Sukatsheva (1985) [52], p. 13, Figure 32.
Necrotaulius westwoodi Tillyard; Carpenter (1992) [29], p. 362, Figure 201,7.
Necrotaulius furcatus (Giebel); Jarzembowski (1999) [53], p. 159, text-Figures 18(A), 18(B).
Necrotaulius furcatus (Giebel); Jarzembowski and Palmer (2010) [54], p. 170, Figure 4.19.
Necrotaulius westwoodi Tillyard; Zhang et al. (2017) [18], p. 28, Figure 7(B).
Necrotaulius furcatus (Giebel); Zhang et al. (2017) [18], p. 28, Figure 7(C).Holotype. YORYM YM 815/NHMUK I.11522 (Figure 4) from the Cotham Member of the Penarth Group (Rhaetian), Aust Cliff, Gloucestershire.Remarks. The holotype of this species was originally reported as YM 815 [55] with the counterpart being sent to the “British Museum” (NHMUK) according to R. Wootton (note in specimen box at YORYM). NHMUK I.11522 was later reported as the holotype by Tillyard [9] who thought that the differences in the specimens were due to breakage after the original holotype figure. However, based on the original figure of the holotype by Brodie ([33], pl. 9, Figure 16) and writing on the rock of the specimens, it is clear that the first report was correct. YM 815 matches the holotype figure by Brodie ([33], pl. 9, Figure 16) and written on the rock in Brodie’s handwriting is “Pl 9 F 16.” Figure 4 shows the specimens involved and copies of the figures from [9, 33]. It is unclear why Tillyard figured I.11522 without the very prominent left forewing (Figure 4(d)); he did suggest that the specimen had broken since Brodie’s original figure, so perhaps it was further prepared after Tillyard had figured it, revealing the forewing. Although the part and counterpart look different, there is a calcite vein that cuts diagonally across the hindwing at the same position in both parts.Additional Material. Rhaetian: NHMUK I.11545, I.11544 (previously holotype ofO. liasina, figd Brodie [33, pl. 9, Figure 17]), I.11534; YORYM: YM1984/7F, YM1984/6F, YM1984/1F from Aust Cliff; I.3081 from Wainlode Cliff (previous holotype ofN. apicalis, Figure 5(a)); one other in the private collection of RAC collected from Blue Anchor. Hettangian: I.11019 from Copt Heath; I.11584 from unknown locality in England (“W” on museum label) (previous holotype ofN. stigmaticus Figure 5(b)); I.11761 (previous holotype ofN. westwoodi, Figure 5(c)) and 11574 both from unknown localities in England.Figure 5
Previous holotypes now considered conspecific withAustaulius furcatus (Giebel, 1856). (a)“Necrotaulius apicalis” Tillyard, 1933 (NHMUK I.3081); (b)“N. stigmaticus” Tillyard, 1933 (NHMUK I.11584); (c)“N. westwoodi” Tillyard, 1933 (NHMUK I.11761), all from Wainlode Cliff, Gloucestershire. Scale bars = 1 mm.
(a)
(b)
(c)Diagnosis. Forewings 4.3–5.6 mm in length, 1.4–1.8 mm in width. Anterior fork (F1) of Rs branching point is almost in line with the branching point of posterior fork (F2), or slightly distal.Description. Holotype forewing 5.3 mm in length. It is an almost whole specimen with both forewings wholly preserved (one on each part); right hindwing nearly complete. Body, head, and antennae also preserved in the counterpart but poorly. One antenna with 15 antennomeres preserved including scape. In forewing Sc terminating on C just beyond mid-wing, with two cross-veins between Sc and C; R simple, reaching anterior margin in apical quarter of the wing within the pterostigma; oblique cross-vein near base between R and Sc; Rs splits from R in basal quarter further bifurcating into two forks of subequal length (posterior fork slightly longer than anterior). M lying very close to R at base and fused with CuA shortly after leaving CuP for a short distance; M bifurcates forming two forks, the anterior shorter than the posterior (this is clearest in the counterpart of the holotype, Figure 3); one cross-vein between M and CuA; CuP is preserved almost to the posterior margin; one cross-vein between CuA and CuP. Additional cross-vein between 1A and 2A near the base. Hindwings are poorly preserved but, in the counterpart, it seems that the venation is similar except there are three veins in the medial system rather than four, the posterior vein being simple. Colour pattern evident in most specimens although it may be faint.Remarks. The remaining species described by Tillyard [9] (N. westwoodi,N. stigmaticus, andN. apicalis) all show the fusion of M and Cu typical ofAustaulius. The backward bent CuP is preserved in the holotype and in the previous holotypes ofN. apicalisandN. westwoodi; inN. stigmaticus this character is not preserved but it can be assumed by its absence that it was desclerotised. Although the type specimens are less well preserved than the type ofA. furcatus, and not all the cross-veins are visible, there is nothing significant to distinguish any of them as being different fromA. furcatus, so they are considered to be junior synonyms. Tillyard drew the outlines ofN. stigmaticus andN. apicaliswith a more pointed tip than is apparent from the specimens. The holotypes ofN. westwoodi,N. stigmaticus, andN. apicalis were collected from Wainlode Cliff and the holotype ofA. furcatus was collected from Aust Cliff. Both localities were reported in Zhang et al. [18] as Early Jurassic (J1) but the insect bearing horizon at these localities is found in the Penarth Group which is Late Triassic in age.Austaulius haustrum sp. nov.
urn:lsid:zoobank.org:act:09920586-B224-437C-A567-46808E8D1AAEHolotype. NHMUK II 3103 a and b (Figure 6), Sinemurian, Turneri Chronozone, Brooki Bed, Monmouth Beach, Lyme Regis, Dorset, UK. Collected by R. A. Coram.Figure 6
Holotype ofAustaulius haustrum gen. et sp. nov. (NHMUK II 3103 a and b) from Monmouth Beach, Lyme Regis, Dorset. Bottom left figure is the right forewing of the holotype flipped so the costal margin is on top. Scale bars = 1 mm.Etymology. Haustrum is the original Latin word for “haustellum” indicating the presence of this character in the holotype.Diagnosis. Forewing length 4.7 mm, width 1.8 mm. Anterior fork (F1) of Rs branches distally of branching point of posterior fork (F2), much further than inA. furcatus.Description. The holotype is a well preserved specimen with two forewings and a partial hind wing, thorax, head, some antennomeres, some leg segments, maxillary and labial palps, and the haustellum. Pronotum is small and heavily sclerotized. Fore coxa broader than the fore femur, mid coxa appears broader but not well preserved. Head is hypognathous. Maxillary palps are longer than the labial palps, two elongate segments of one palp preserved; three labial palp segments preserved (as well as another unidentified palp with two segments), attached to the haustellum. Eye socket appears large, but only a small portion of the actual eye is preserved and there is a groove above the eye where the lateral ocellus would be found. The apex of CuP appears to be desclerotised as inA. furcatus.Remarks. This specimen was figured by Coram ([56], Figure 5) as a “Caddisfly-like necrotauliid.” This is the only necrotauliid specimen to preserve the haustellum. As discussed in the introduction, this is the only specified adult synapomorphy for Trichoptera [22] and suggests that the Necrotauliidae are trichopterans.


## 5. Discussion

The necrotauliids have been considered to be primitive trichopterans, advanced stem-amphiesmenopterans, and a paraphyletic assemblage of primitive trichopterans, primitive lepidopterans, and stem-amphiesmenopterans. Therefore, necrotauliids represent an important group for understanding the evolution of the Amphiesmenoptera but much of the taxonomy of the group was in need of revision. Ansorge [12, 14] revised the Upper Lias German material, restricting the Necrotauliidae to two species and removing the family from Trichoptera, suggesting thatLiadotaulius (Philopotamidae) was the only true trichopteran from the German Upper Lias.EnglishNecrotaulius are sparse and only three specimens were identified asN. parvulus; this is also the only species of this genus from the Lias of England. Most of the specimens previously attributed toNecrotaulius are herein considered to belong to a separate and older genus(Austaulius)which, based on the current fossil record, survived the end Triassic mass extinction but is not recorded after the appearance ofNecrotaulius in England. This genus can be separated fromNecrotaulius by the fusion of M and CuA near the base for a short distance.The holotype ofA. haustrum is well preserved and exhibits several mouthpart characters that are rare in amphiesmenopteran fossils. The head is visible with a partial eye preserved; ventral to the main head capsule there is a structure from which the labial palps originate. The labial palps appear to be formed of three elongated segments and would probably be about half the length of the maxillary palps as in extant Trichoptera [57]. The haustellum is the only suggested autapomorphy for adult Trichoptera [25] and we propose that the structure in the holotype ofA. haustrum ventral to the head and attached to the labial palps is the haustellum. It is a composite of the prelabium and the hypopharynx which forms a short proboscis used for sucking up liquids [22]; it is not homologous to the structure of the same name in Diptera [58]. For an in-depth description of the morphology of an adult trichopteran head see [58]; [25] provides a lateral photograph of a trichopteran head with a short haustellum and palps similar to those seen in the holotype ofA. haustrum. The presence of a haustellum in the holotype ofA. haustrum suggests that the family Necrotauliidae belongs to the Trichoptera.



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