Entomobrya pseudomarginata Jordana & Greenslade 2020, sp. nov.
Creators: name: Jordana, Rafael
name: Greenslade, Penelope
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Entognatha
Collembola
Entomobryidae
Entomobrya
Entomobrya pseudomarginata

description: Entomobrya pseudomarginata sp. nov.
(Figs 3B, 5I, 33 A–G)
Holotype. Male, WA, Reabold Hill, Perth, 1976–77, - 31.9405°S, 115.7760°E, 93m asl, pitfalls, J. Major leg. [SAMA 22657-01].
Paratypes. On same slide as holotype, male and two females, [SAMA 22657-02]; male, three females and juvenile, [SAMA 22657-03]; 3 females and juvenile, [SAMA 22657-04]; 2 females and juvenile, [SAMA 22657- 04]; numerous specimens in alcohol; all paratypes from same locality and date as holotype. Originally labelled as E. marginata.
Other material examined. Male, SA, Fairview Conservation Park, - 36.8277°S, 140.4153°E 35m asl, under stones in lake bed, 9.x.1982, PG leg.
Description. Size. Length up to 1.28 mm excluding antennae, (n= 8), males smaller than females (1.067 vs 1.414).
Colour. Purple appearing granulated with dark antennae, anterior part of the head, legs and a transverse stripe posteriorly on each tergite (Fig. 3B and 5I).
Head. Eight eyes, G and H 2/3 of E and F in size (Fig. 33D). Antennal length 542 μm (n=5), 1.88 times the length of the head (n= 5). Ant IV with bilobed apical vesicle with adjacent pin chaeta; relative length of Ant I/II/III/ IV=1/1.8/1.9/2.8 (n=5). Sensory organ of Ant III with straight rod-like sensilla in addition to the normal guard sensilla); four labral smooth papillae (Fig. 33A). Labral Mc formula 4/554; 4 prelabral ciliated chaetae; labral chaetae smooth. Labial chaetae MREL 1 L 2 all ciliated, with only one Mc M, and R smaller than M. Labial papilla E with external process reaching the papilla tip. Maxillary palp bifurcate with three sublobal chaetae.
Thorax and abdomen. Ratio of lengths Abd IV/III=4 (n=8). Tibiotarsus without differentiated chaetae, with exception of the smooth terminal chaetae on legs 3, characteristic for the genus. Trochanteral organ with 6 spiny chaetae. Unguis length of internal edge 30 μm and 40 μm at external one. Unguis (Fig. 33B) with 4 teeth, paired two at 33% from base and first unpaired tooth at 66% from the base, the terminal one minute, difficult to see; lateral teeth below the level of paired ones Unguiculus lanceolate, with external serrated lamella. Tenent hair clavate, same size as internal unguis edge. Length of manubrium and dens 255 + 290=545 μm (n= 8), dens a little longer than the manubrium, with small differences in length between them for Entomobrya. Manubrial plate with 4 chaetae and 2 pseudopores. Mucro bidentate with apical tooth longer than subapical one, with mucronal basal spine reaching the tip of the subapical tooth (Fig. 33C). Mucro 15 μm, (n=6). The length of smooth apical part of dens 36.5 μm.
Macrochaetotaxy. Simplified Mc formula: 3,1,0,3,2/3,3/1,2/0,0,1/0,0,2,2,2. Head chaetotaxy (Fig. 33D) Mc An 1, An 2, An 3a1 and An 3 present and with A 5 mac on A2 area. M 1 to M 4 present as Mc. In sutural row S 0, S 1, S 3, S 4i, S 4, S 5i and S 5, Ps 2 and Ps 5 present. Thoracic chaetotaxy on Th II (Fig. 33E) with Mc m 1, m 2 and m 2i present on T1 area. On T2 area with Mc a 5, m 4 and m 4i present. Abdominal chaetotaxy (Fig. 33F), a 2 and a 3 absent on A1 area at Abd II, only m 3 and m 3e Mc present on A2 area of Abd II, on Abd III only m 3 Mc present on A5 area, Abd IV (Fig.33G) with Mc A 4 –A 6, B 5 –B 6 and C 2a. Sensillary formula not seen because of dark colour.
Remarks. Several Australian Entomobrya have 0,2/0,0,1 Mc on Abd II and III as does Entomobrya pseudomarginata sp. nov. They are E. assuta, E. additae sp. nov., E. boreensis sp. nov., E. clarki, E. niger comb. nov. and E. stirlingensis sp. nov. but E. pseudomarginata sp. nov. differs in the presence of smooth labral papillae, and 3, 3 Mc on T1 and T2 areas of Th II as well as having a different colour.
Etymology. Named for its similarity superficially to E. marginata.
description: Published as part of Jordana, Rafael & Greenslade, Penelope, 2020, Biogeographical and ecological insights from Australasian faunas: the megadiverse collembolan genus, Entomobrya (Entomobryidae), pp. 1-104 in Zootaxa 4770 (1) on pages 62-64, DOI: 10.11646/zootaxa.4770.1.1, http://zenodo.org/record/3797958