Entomobrya potterae, 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 : 56-59

Entomobrya potterae sp. nov.

( Fig. 2N , 30 A–E)

Holotype. Female, NSW, Robertson, - 34.5833°S, 150.5833°E, 731m asl, on Protea , 10.5.95, C. Weller leg. [ SAMA 22654 ].

Description. Size. Length 2300 µm.

Colour. Label notes pale colour of specimens.

Head. Eight eyes, G and H smaller than E and F. Antennal length 1187 μm, 2.8 times the length of the head. Ant IV with bilobed apical vesicle; relative length of Ant segments: 1/1.6/1.6/1.8. Labral papillae spinulate ( Fig. 30A ). Prelabral chaetae ciliated, labral chaetae 5,5,4 smooth. Lateral process of labial papilla E not reaching the papilla tip. Labial posterior row with MREL 1 L 2 all ciliated and R smaller than M.

Thorax and abdomen. Ratio of lengths Abd IV/III=3.5. Tibiotarsus without differentiated chaetae, with exception of the presence of the smooth terminal chaetae on legs 3, characteristic for the genus. Trochanteral organ with around 22 chaetae. Unguis with 4 teeth: paired two at 50% from base, first unpaired tooth at 75 % from the base, dorsal tooth basal. Unguiculus acuminated, narrow, external lamella of leg 3 smooth. Tenent hair clavate, longer than unguis. Manubrial plate with 4 chaetae and 2 pseudopores. Mucro bidentate, both teeth similar in size with mucronal basal spine. Mucronal length 15 micrometers; smooth apical portion of dens twice length mucro.

Macrochaetotaxy. Simplified Mc formula: 3,3,0,3,2/3,4/2,3/1,2,2(1)/3,3,4,2,2. Head chaetotaxy ( Fig. 30B ) An 1 (mes), Mac An 2, An 3a1, An 3 and A 5, (A 6 and A 7 as Mc). M 1 –M 4 present as Mc. In sutural row 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 with Th II chaetotaxy ( Fig. 30C ) T1 area with Mac m 1, m 2 and m 2i, T2 area with Mc a 5, m 4, m 4i and m 5. Abdominal chaetotaxy ( Fig. 30D ) of Abd II with a 2, a 3, m 3,m 3ep and m 3e, on Abd III a 1, a 2, a 3 and m 3 Mc present, Mc m 3a asymmetrically present or absent; Abd IV (Fig. 274) with Mc A 2, A 4 –A 6, A e4, B 1 –B 2, B 4 –B 6, B e2, B e3, C 2a and E 1. Sensillary formula as normal for Entomobrya . Bothriotricha on Abd IV in position T 2 and T 4 (0110).

Remarks. Only one adult specimen available, but the chaetotaxy, with every chaetae present, is unique among world Entomobrya . However, the Mc distribution on Abd II and III, means this new species is similar to some other Entomobrya . The Mc of T1 area on Th II (m 1, m 2 and m 2i) made it similar to E. dungeri Jordana, Schulz & Baquero, 2009 , E. leeparkae Jordana, 2012 and E. turcestanica Stach, 1963 , These three species differ by having 3, 3 and 6 Mc on T2 area on Th II instead of 4 (m 5 present) Table 8 .

Etymology. Named for the completeness of its chaetotaxy.

Figures

FIGURE 2. Habitus and colour of: A, Entomobrya herberti sp. nov.; B, Entomobrya imbre sp. nov.; C, Entomobrya karta sp. nov. sp.; D, Entomobrya kitchingi sp. nov.; E, E. lamingtonensis Schött, 1917; F, Entomobrya loftyensis sp. nov.; G, Entomobrya ludimus sp. nov.; E. mauretanica Handschin, 1925 sensu Baquero et al., 2009; I, Entomobrya militum sp. nov.; J, E. multifasciata (Tullberg, 1871) Brook, 1884; K, Entomobrya niger comb. nov.; L–M, E. nigrocincta Denis, 1923, L, female, M, male; N, Entomobrya potterae sp. nov.; O, Entomobrya peregrina sp. nov. Bar=0.5 mm.

FIGURE 30. Entomobrya potterae sp. nov. Line drawings A–E: A, labral papillae (bar=0.020 mm); B, head chaetotaxy; C, Th II chaetotaxy; D, Abd II–III chaetotaxy; E, Abd IV chaetotaxy. Open circle mean unstable Mc. Bar for B–E=0.050 mm.