Entomobrya militum, Jordana & Greenslade, 2020

Jordana, Rafael & Greenslade, Penelope, 2020, Biogeographical and ecological insights from Australasian faunas: the megadiverse collembolan genus, Entomobrya (Entomobryidae), Zootaxa 4770 (1), pp. 1-104: 51-52

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Entomobrya militum

sp. nov.

Entomobrya militum   sp. nov.

( Figs 2I View FIGURE 2 , 5C View FIGURE 5 , 26 View FIGURE 26 A–D)

Holotype. Female, ACT, Russell Offices, - 35.296°S, 149.150°E, 578m asl, alienated, mown native grassland, adjacent to remnant Themeda   with eucalypts, pitfalls, Nov. 94, PG leg. [ SAMA 22668 View Materials ]. GoogleMaps  

Paratype. Male, the same collection data as holotype.

Description. Size. Length 2.1 mm.

Colour. Dark blue including antennae, legs and manubrium ( Fig. 5C View FIGURE 5 ).

Head. Eight eyes, G and H smaller in size than E and F. Antennal length 952 μm, twice length of head. Ant IV with simple apical vesicle; relative length of Ant segments: 1/1.75/1.65/1.75. Labral papillae multispinate. Labral chaetotaxy with 5 prelabral ciliate chaetae, and 5,5,4 smooth. External process of labial papilla E not reaching to papilla tip. Only one chaetae L 2 of posterior labial row can be see and it is ciliated. Ratio Ant/head, 2.55.

Thorax and abdomen. Ratio lengths Abd IV/III=3. Tibiotarsus without differentiated chaetae, with exception of the presence of the smooth terminal chaetae on legs 3, characteristic for the genus. Unguis with 4 teeth, paired two at 50% of the base and long for an Entomobrya   , first unpaired tooth at 75 % from the base and small; lateral and dorsal teeth at intermediate level between base and internal paired teeth. Trochanteral organ with around 21 chaetae. Unguiculus acuminated, narrow, external lamella with three small teeth. Tenent hair clavate, longer than unguis. Manubrial plate with 4 chaetae and 2 pseudopores. Mucro bidentate, both teeth of similar size with mucronal basal spine. Mucro of 15 micrometers and distal, smooth part of dens twice length mucro.

Macrochaetotaxy. Simplified Mc formula: 3,1,0,1,1a/1,3/0,2/1,0,1/0,0,2,2,2. Head chaetotaxy ( Fig. 25A View FIGURE 25 ) An 2, An 3a1, An 3 and A 5 Mac. Only M 1 and M 4 present as Mc. In sutural row present S 0, S 2, S 3, S 4, S 5i and S 5. Only Ps 5 present. Thoracic chaetotaxy: Th II chaetotaxy ( Fig. 25B View FIGURE 25 ) with Mc m 1 on T1 area, on T2 area with Mc a 5, m 4 and m 5. Abdominal chaetotaxy ( Fig. 25C View FIGURE 25 ): Abd II m 3ep and m 3e; on Abd III a 1 and m 3 Mc present; Abd IV ( Fig. 25D View FIGURE 25 ) with Mc A 4 –A 6, B 4 –B 6. Sensillary formula usual of Entomobrya   , the bothriotricha on Abd IV in position T 2 and T 4 (0110).

Remarks. Only one adult was available which could be confused with other dark coloured Entomobrya   . The chaetotaxy of Abd II and III is similar to E. imbre   sp. nov. but m 5 Mc is present on Th II in E. militum   and absent on E. imbre   sp. nov. See also the remarks for E. imbre   sp. nov.

The collection site of this species is a small remnant of grassy woodland remaining in the centre of Canberra city that was surveyed for invertebrates as it was threatened with being cleared for a car park. On the basis of its vegetation and invertebrate fauna it was given protection. The site was adjacent to the offices of the Department of Defence hence the species name. The species appears to be a short-range endemic.

Etymology. Named for its location adjacent to Department of Defence offices.