Entomobrya charlotteensis, 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 : 27-29

Entomobrya charlotteensis sp. nov.

( Figs 1 G–H, 12A–G)

Holotype. Female NSW, Kosciusko NP, Charlotte Pass, - 36.4317°S, 148.3289°E, 1837m asl, Leaf litter Eucalyptus Woodland , 4.i.1976, PG leg. [ SAMA 22642–01 ].

Paratype. Male on another slide with the same, locality and date. [ SAMA 22642–02 ] .

Description. Size. Length female 1.649 mm, male 1.113 mm.

Colour. Cleared but some bands and stripes seen (Figs G–H).

Head. Eight eyes, G and H small in size than E and F. Antennae length 996 μm (female) and 552 μm (male), 2.8– 2.5 times the length of the head.Ant IV with bilobed apical vesicle; relative length of Ant segments: 1/1.75/1.65/1.99 (female) 1/2.51/2.38/3.01 (male). Sensory organ Ant III similar drawing on figure 12B. Labral papillae spinulate. Labral chaetotaxy with 4/554 chaetae, prelabral ciliate and labral smooth. Labial chaetae with MREL 1 L 2, all ciliated with R 2/3 of M in length. External process of labial papilla E reaching at the papilla tip.

Body. Length ratio of Abd IV/III=3 (female), 5 (male). 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 at 50–60% of the basis, first unpaired at 75 % from the basis; lateral and dorsal teeth intermediate at a level below the internal paired teeth. Unguiculus acuminated, narrow, external lamella of leg serrated. Tenent hair clavate, longer than unguis. Trochanteral organ with near 20 chaetae. Manubrial plate with 4 chaetae and 2 pseudopores. Mucro bidentate both teeth of similar size with mucronal basal spine.

Macrochaetotaxy. Simplified Mc formula: female 3,1,0,2,2/4,4/0,2/U,0,1/0,0,2,2,2. male: 3,1,0,2,2/3,4/0(1),2/1,0,1/0,0,2,2,2. Head chaetotaxy for male and female ( Fig. 12A ) An 2, An 3a1, An 3 and A 5 Mac. Only M 2 and M 4 present as Mc. In sutural row present S 0, S 2, S 3, S 4i, S 4, S 5i and S 5. Ps 2 and Ps 5 present. Thoracic chaetotaxy as female Th II chaetotaxy ( Fig. 12D ) Mc m 1, m 2, m 2i and m 2i2. Male ( Fig 12C ) similar but without m 2i2. Abdominal chaetotaxy as female Abd II ( Fig. 12F ) with m 3 and m 3e; on Abd III m 3 Mc present but a 1 not possible to see because the intestinal content. Male ( Fig 12E ) with Mc a 2 present or absent asymmetrically, m 3 and m 3e present, but in one side appear m 3e2; Abd IV similar for male and female ( Fig. 12G ) with Mc A 4 –A 6, B 4 –B 6. Sensillary formulae usual for Entomobrya , the bothriotricha on Abd IV in position T 2 and T 4 (0110).

Remarks. These two specimens could be the same species exhibiting sexual dimorphism in colour and variable chaetotaxy (asymmetrical in male) or two species captured in the same locality and on the same date. Both are adult. No other Entomobrya has the chaetotaxy of either of these two specimens, male or female. Three species have 3,4 Mc on T1 and T2 areas on Th II and with 0 or 1 Mc on A1 area of Abd II: Entomobrya ligata Folsom, 1924 , Entomobrya brinevi Jordana, Potapov & Baquero, 2011 ,, and this new species. Abd III and IV of E. ligata has 0,0,1/0,1,1,2,2 Mc and E. brinevi has 0,1,1/0,1,2,2,2 Mc different to E. charlotteensis .

Etymology. Named after the locality in the Snowy Mountain Range from where it was collected.

Figures

FIGURE 1. Habitus and colour of: A, Entomobrya additae sp. nov.; B, Entomobrya albocincta; C, E. assuta; D, Entomobrya bioblitzi, sp. nov.; E. Entomobrya boreensis, sp. nov.; F, Entomobrya caputovisensis sp. nov.; G–H, Entomobrya charlotteensis sp. nov. 7, male, H, female; I, E. clarki; J–K, Entomobrya darelis sp. nov.; L, Entomobrya driesseni sp. nov.; M, Entomobrya durrasensis sp. nov.; N, Entomobrya grisacea sp. nov.; O, Entomobrya herbacea sp. nov. Bar=0.5 mm.

FIGURE 12. Entomobrya charlotteensis sp. nov. Line drawings A–G.A, head chaetotaxy (bar=0.04 mm for male and 0.06 mm for female); B, Ant III organ (bar=0.006 mm); C, male Th II chaetotaxy (bar=0.06 mm); D, female Th II chaetotaxy (bar=0.04 mm); E, male Abd II–III chaetotaxy (bar=0.1 mm); F, female Abd II–III chaetotaxy (bar=0.085 mm); G, Abd IV male (left) and female (right) chaetotaxy, (bar=0.1 mm).