Entomobrya driesseni Jordana & Greenslade 2020, sp. nov.

Entomobrya driesseni sp. nov.

(Figs 1L, 4G, 15 A–F)

Holotype. Female, TAS, Warra Forest, 100 m site, - 43.016°S, 146.7°E, pitfalls, 5.iii.2012, M. Driessen leg. [SAMA 22644].

Paratypes. Two males, same data as holotype.

Description. Size. Length up to 1.284 mm excluding antennae (n=3).

Colour. Dark blue with darker colour laterally and posterior parts of Th II and III, a posterior stripe on Abd I, lateral and posterior stripe on Abd II. Posterior stripe on Abd III and a lateral and posterior spot on Abd IV. Legs and antennae dark blue. Head with an anterior black spot between antennae, the ocular spot black (Figs 1L, 4G).

Head. Eight eyes, G and H smaller than E and F. Antennal length 440 μm, 2.2 times the length of the head. Ant IV with simple apical vesicle; relative length of Ant segments: 1/1.7/1.3/2.3. Four labral multispinate papillae (Fig.15B). Four prelabral ciliated chaetae and 5,5,4 smooth labral chaetae. External process of labial papilla E reaching the papilla tip. Labium chaetotaxy not seen clearly, only the posterior chaetae seems ciliated.

Thorax and abdomen. Length ratio of Abd IV/III=5.8. 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 similar in size: paired at 50% of the basis, first unpaired at 75 % from the basis; lateral teeth at the level of paired ones. Unguiculus acuminated, external lamella serrated. Tenent hair clavate, longer than unguis. Trochanteral organ with 13 chaetae. Manubrial plate with 4 chaetae and 2 pseudopores. Mucro bidentate both teeth the same size, and with mucronal basal spine surpassing a little the tip of the subapical tooth, Mucro of 10 micrometers and not annulated dens five times the mucro.

Macrochaetotaxy. Simplified Mc formula: 3,1,0,3,2/3,3/1,2/1,0,1/0,2,1,2,2. Head chaetotaxy (Fig. 15A) An 2, An 3a1, An 3 and A 5 Mac. Only M 1, M 2 and M 4 present as Mc. In sutural row present S 0, S 1, S 2, S 3, S 4i, S 4, S 5i and S 5. Ps 2 and Ps 5 present. Thoracic chaetotaxy as Th II chaetotaxy (Fig. 15C) with Mc m 1 and m 2i on T1 area, on T2 area with Mc a 5, m 4 and m 4i. Abdominal chaetotaxy with Abd II (Fig. 15D) with a 2, m 3ep and m 3e Mc present on A2 area of Abd II. On Abd III (Fig. 15E) a 1 and m 3 Mc present on A5 area; Abd IV (Fig. 15F) with Mc A 3, A 5 –A 6, A e3, A e4, B 4 –B 6 and C 1. Sensillary formula usual of Entomobrya, the bothriotricha on Abd IV in position T 2 and T 4 (0110).

Remarks. In colour pattern, E. driesseni sp. nov. could be confused with E. marginata. In the chaetotaxy of Th II and the chaetotaxy of Abd II and III, it is similar to E. albocincta and E. germanica Jordana, Schulz & Baquero, 2011. The colour differentiates them. Also, only E. germanica has multispinate labral papillae as does this new species but the chaetotaxy of head and Abd IV differs between them: 1,1,0,2,2 for the head and 0,0,3,2,2 for Abd IV. The external unguiculus is serrate in this new species and smooth in E. germanica.

Etymology. The species is dedicated to Dr Michael Driessen, Tasmanian World Heritage Zoologist, who has collected many Collembola from the area.