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

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Entomobrya darelis

sp. nov.

Entomobrya darelis sp. nov.

( Figs1 View FIGURE 1 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 View Materials ]. GoogleMaps

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

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 View FIGURE 1 J–K, 4F).

Head. Eight eyes, GH smaller than EF, 1/2 than EF ( Fig. 14A View FIGURE 14 ). 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 View FIGURE 14 ). 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 View FIGURE 14 ). 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 View FIGURE 14 ). 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 View FIGURE 14 ). Abd II with Mc a 2, a 3, m 3, m 3ep, m 3e and m 3eai2, sometimes m 3ea present ( Fig. 14F View FIGURE 14 ). Abd III with Mc a 1, a 2, a 3, m 3 and m 3e ( Fig. 14G View FIGURE 14 ). 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 View FIGURE 14 ).

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.


Museum national d'Histoire Naturelle, Laboratiore de Paleontologie


Departamento de Geologia, Universidad de Chile


Royal Botanic Gardens, National Herbarium of New South Wales


South Australia Museum