Entomobrya darelis, 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 : 31-32

Entomobrya darelis sp. nov.

( Figs1 J–K, 4F, 14A–H)

Holotype. Female , SA, Hindmarsh Island, revegetated site, Wayne’s property, - 35.516°S, 138.866°E, 25m asl, pitfalls, 4.x.2013, PG and G. Horrocke leg. [ SAMA 22643–01 ].

Paratypes. Female , same locality and date. [ SAMA 22643–02 ]; four specimens in ethyl alcohol same locality and date; female SA , Hindmarsh Island , revegetated sites, Anne old, - 35.5162°S, 138.8762°E, 25m asl, 4.x.2013,PG GH leg, [ SAMA 22643–03 ,]; female 8 specimens in ethyl alcohol, Grey Young Hindmarsh Island, 5.x.2013 [ SAMA 22643–04 ]; female, SA , Hindmarsh Island , revegetated sites, Anne young, - 35.5162°S, 138.8762°E, 25m asl, 4.x.2013, PG GH leg. [ SAMA 22643–05 ], and seventeen in ethyl alcohol, [ SAMA 22643–06 ] .

Other material examined. Female on slide, QLD, Lamington NP, (labelled as E. virgata ) - 28.188°S, 153.121°E, 700m asl, Eucalyptus forest, pitfalls, Oct. 2006, R. Kitching leg); juvenile, QLD, 15 km E of Killarney, Rosser’s property, - 28.3539°S, 152.338°E, 512m asl, wet sclerophyl forest, 16.v.1974, PG leg.; female, NSW, nr Armidale, Chiswick farm, - 32°S, 147°E, 980m asl, Pasture, 1971–9, K. King leg.; 2 specimens on slide, 32 specimens in ethyl alcohol; female WA, Perth, - 31.986°S, 115.822°E, 7m asl, 1932, HW leg; female, WA, Perth, - 31.986°S, 115.822°E, 7m asl, June 1930, HW leg.[ SAMA].

Description. Size. Length up to 1.929 mm (n=8) excluding antennae.

Colour. Variable, some specimens totally pigmented sky-blue, with darker blue bands posteriorly and laterally on body segments, Abd IV with white spots anteriorly on segment and two medio-lateral longitudinal stripes as in figure 1J–K. Some specimens, probably from mounting medium, slightly yellowish, with patches of faded blue pigment remaining in position of darkest areas of other specimens, but others totally lacking pigment ( Figs 1 J–K, 4F).

Head. Eight eyes, GH smaller than EF, 1/2 than EF ( Fig. 14A ). Antennal length 832 μm (n=7), 2.41 times the length of the head.Apical vesicle of Ant IV bilobed with pin chaetae. Relative length of Ant I/II/III/IV=1/2.00/1.9/2.2. Four prelabral chaetae ciliated. 5,5,4 labral chaetae smooth, labral papillae smooth with a little protrusion ( Fig. 14B ). Posterior labial chaetae –M 2 REL 1 L 2 all ciliated, only with, R smaller than others (1/2 than M2). Anterior labial chaetae smooth.

Thorax and abdomen. Length ratio of Abd IV/III=3:5 (n=8). Trochanteral organ with 18–22 smooth and spinelike chaetae ( Fig. 14C ). Tibiotarsus without smooth chaetae, with exception of smooth terminal chaeta on legs 3, characteristic for the genus. Trochanteral organ from 15 to 22 chaetae Unguis with 4 teeth, first pair at 50% of the unguis base and first unpaired tooth at 75%. Unguiculus with the external edge serrated, sometimes difficult to see. Mean length of manubrium and dens 759 μm (340+419 μm respectively, n=6)). Manubrial plate with 4 chaetae and 2 pseudopores. Mucro 10 μm with teeth similar in size and with mucronal spine reaching tip of subapical tooth, distal smooth part of dens 22 μm.

Macrochaetotaxy. Simplified Mc formula: 3,1,0,3,2/2,3/2,4(5)/1,2,2/1(3),3(4),4,2,2 (maximum in parentheses, some of them mes). Head chaetotaxy ( Fig. 14D ). With Mc An 2, An 3a1 and An 3 on H1 area, A 5 on H2 area, Without S’ 0, With S 0 –S 5. With Ps 2 and Ps 5 as Mc, without Mc Ps 3, sometimes as mesochaeta. Thoracic chaetotaxy: area T1 on Th II with Mc m 1 and m 2i; area T2 with 3 Mc (m 4, m 4i, and a 5) ( Fig. 14E ). Abd II with Mc a 2, a 3, m 3, m 3ep, m 3e and m 3eai2, sometimes m 3ea present ( Fig. 14F ). Abd III with Mc a 1, a 2, a 3, m 3 and m 3e ( Fig. 14G ). Abd IV with Mc A 2, A 4 –A 6, Ae 4, B 1, B 3 –B 6, C 2a and E 1. Mc Be 2, D 1 and C 1 can be present or absent ( Fig. 14H ).

Remarks. From the colour and its variations, this species could be mistaken for E. marginata ( Tullberg, 1871) Brook, 1884 , E. multifasciata ( Tullberg, 1871) Brook, 1884 , the female of E. nigrocincta Denis, 1923 or E. atrocincta Schött, 1896 from USA. However, the chaetotaxy of Abd segments II, III, is similar to Entomobrya naziridisi Jordana & Baquero, 2008 (in Ramel et al. 2008), Entomobrya tasmomarginata sp. nov., and Entomobrya irayae Baquero & Jordana, 2018 . The chaetotaxy of Th II (2,3) on areas T1 and T2 (m 1, m 2i, a 5, m 4 and m 4i) separates the new species by the presence of m 5 on E. tasmomarginata sp. nov., E. irayae , and E. naziridisi .

Etymology. Derived from an Old English girl’s name meaning “beloved” here relating to the study of Collembola.

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 14. Entomobrya darelis sp. nov. Line drawings A–H. A, eyes (bar=0.050 mm); B, labral papillae (bar=0.025 mm); C, trochanteral organ (bar=0.006 mm); D, head chaetotaxy (bar=0.08 mm); E, Th II chaetotaxy (bar=0.08 mm); F, Abd II chaetotaxy (bar=0.130 mm); G, Abd III chaetotaxy. Bar=0.125 mm; H, Abd IV chaetotaxy (bar=0.08 mm). Open circles unstable Mc.