Ishigakidiplosis Elsayed 2024, gen. nov.
Creators: name: Elsayed, Ayman Khamis
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Cecidomyiidae
Ishigakidiplosis

description: Ishigakidiplosis Elsayed, gen. nov.
LSID: urn:lsid:zoobank.org:act: 7C7C95AB-19FE-41F3-9E70- 3E2C134A4F31
Type species: Ishigakidiplosis karamae Elsayed * sp. nov. designated here.
Diagnosis
The new genus Ishigakidiplosis belongs to the supertribe Cecidomyiidi because of the presence of an occipital dorsal protuberance on the adult head (Fig. 2A * B)* the cylindrical female flagellomeres* the binodal male flagellomeres (Fig. 2C–F)* and the loss of setae on the ventral papillae of the larval abdominal segment VIII (Gagné 1994 * Gagné and Jaschhof 2021). Ishigakidiplosis differs from all genera of Cecidomyiidi by the following combination of characters: the palpus is four-segmented (Fig. 2A * G* H); the tarsal claws are toothed and bent after the basal third (Fig. 3A); the wing vein R 5 joins C posteriad of the wing apex (Fig. 3B); the ovipositor is protrusible; the female cerci are separated* and each cercus bears ventral and apicoventral setae slightly thicker and longer than the surrounding ones (Figs 3C * 4); the gonocoxal mediobasal lobes are absent (Fig. 5F); the male hypoproct is bilobed* and the lobes are large and splayed and connected dorsomedially to a central* triangular* microtrichose lobe (Fig. 5C * D* F); the aedeagus has a remarkable dorsal slit (Fig. 5F * G); the pupation takes place in soil and the pupal exuviae is mostly hyaline (Fig. 6); the larval spatula is bilobed (Fig. 7A); and the larval terminal abdominal segment bears six corniform and two setiform papillae (Fig. 7B * C). In particular* Ishigakidiplosis is unique among known gall midges for its triangular lobe connecting the hypoproctal lobes dorsomedially (Fig. 5C * D* F). This lobe has been reported rarely in some taxa of Cecidomyiinae * but it is usually smaller than that of Ishigakidiplosis and situated basally on the hypoproct (Peter Kolesik* pers. comm.* 2023). It can be present either ventrally* as in Odontodiplosis Felt and some species of Lestodiplosis Kieffer (Gagné and Lill 1999* Gagné 2018)* or dorsally* as in Stomatosema gagnei Kolesik (Kolesik and Halling 2022; Peter Kolesik* pers. comm.* 2023).
Description
Adult& head: Eyes connate. Occiput with dorsal protuberance (Fig. 2A * B). Antenna: female flagellomeres cylindrical* with two connected bands of circumfila* with short necks (Fig. 2C * D); male flagellomeres binodal* with looped circumfila (Fig. 2E * F). Palpus four-segmented (Fig. 2A * G* H).
Adult& thorax: Anepimeron with setae; anepisternum with scales; katepisternum bare. Tarsomere I without ventroapical extension. Acromere (Fig. 3A): claws toothed basally* bent after basal third. Wing (Figs 1E * F* 3B): R 1 joining C slightly before mid-length of wing; Sc pigmented; R S slightly closer to end of R 1 than arculus; R 5 joining C posteriad of wing apex; C broken after conjunction with R 5; wing fold present; M 4 forked with CuA.
Female abdomen: Ovipositor (Figs 3C * 4): protrusible portion bare dorsally* mostly covered with short and a few long setae ventrally and laterally; cerci separated* each with several ventral and apicoventral setae slightly thicker and longer than surrounding ones; hypoproct with two apical setae.
Male abdomen: Terminalia (Fig. 5C–G): cercal lobes oval; hypoproct bilobed* lobes large* ellipsoid* splayed* concave ventrally* with microtrichose surface and several subapical dorsal setae* lobes connected dorsomedially to central* triangular* microtrichose lobe; aedeagus cylindrical* slightly wider at base* with remarkable dorsal slit; gonocoxite without mediobasal lobe* setose; gonostylus microtichose basally* carinate and setose distally.
Pupal exuviae: Mostly Hyaline* except prothoracic spiracle and enlarged dorsal abdominal spines (Fig. 6). Prothoracic spiracles (Fig. 6C) elongate* slightly curved* with trachea extending to tip. Abdominal segments II–VI with tiny stigma-like spiracles. Terga II–VIII with enlarged spines on anteromedian third (Fig. 6D).
Larva& third instar: Spatula bilobed (Fig. 7A). Ventral and dorsal papillar pattern largely in accordance with the basic pattern in Cecidomyiidi (Möhn 1955) but with the following peculiarities: ventral papillae asetose on thoracic and abdominal segments I–VIII; two pairs of pleural papillae* asetose on thorax* setose on abdominal segments I–VIII; six dorsal papillae* asetose on thorax* setose on abdominal segments I–VII; two setose dorsal papillae on abdominal segment VIII. Terminal segment with two setose and six corniform papillae (Fig. 7B * C).
Etymology
The name combines ‘Ishigaki’* the island where the gall midge was collected* with ‘diplosis’* the commonly used suffix for Cecidomyiini that means double* referring to the binodal male flagellomeres.
description: Published as part of Elsayed, Ayman Khamis, 2024, Integrative taxonomy reveals a new gall midge genus and species (Diptera: Cecidomyiidae) developing in the flower buds of Pongamia pinnata (Fabaceae) in Japan, pp. 1-13 in Zoological Journal of the Linnean Society 202 on pages 3-10, DOI: 10.1093/zoolinnean/zlad152, http://zenodo.org/record/14275453