Entomobrya nigrocincta Denis, 1923

Jordana, Rafael & Greenslade, Penelope, 2020, Biogeographical and ecological insights from Australasian faunas: the megadiverse collembolan genus, Entomobrya (Entomobryidae), Zootaxa 4770 (1), pp. 1-104 : 55-56

Entomobrya nigrocincta Denis, 1923

( Figs 2 L–M, 5F–G, 29A–G)

Entomobrya clitellaria sensu Womersley 1934 , nec Guthrie, 1903.

Entomobrya clitellaria newmani Womersley, 1934 , syn. nov.

Entomobrya atrocincta , ad partem, most European records are synonyms proposed by Salmon, 1964

Entomobrya atrocincta, Ramel et al. 2008

Type locality. France .

Other material examined. SAMA: female, NSW, Armidale no date, - 30.5016°S, 151.6662°E, 980m asl; female, 2 males , NSW, Armidale , - 30.5016°S, 151.6662°E, 980m asl; 1 male , NSW, Armidale , - 30.5016°S, 151.6662°E, 980m asl, September 1973, KK leg.; female NSW, Kosciusko N. P., Charlotte Pass , - 36.4317°S, 148.3289°E, 1,837m asl, leaf litter under bark, 4.i.1976, PG leg.; male SA, Urrbrae , - 34.9670°S, 138.6360°E, 118,m asl subclover, July 1930, HW leg.; male , SA, Adelaide , no date, - 35.928661°S, 138.598631°E, 50m asl; female SA, Glen Osmond , - 34.9600°S, 138.6502°E, 300m asl, May–July 1973, PG leg.; males , SA, Kangaroo Island , - 35.7752°S, 137.2142°E, 299m asl, 2.ii.1972, PG leg.; male SA, Cambrai , dune, 26.iii.1972, PG leg., - 34.6639°S, 139.3212°E, 305m asl; female SA, Glen Osmond , - 34.9600°S, 138.6502°E, 300m asl, May 1972, PG leg.; male , SA, Naracoorte Reserve , - 36.957°S, 140.738278°E, 61m asl, 5.x.1975, PG leg .; SA, Glen Osmond , - 34.9600°S, 138.6502°E, 300m asl, soils lab, May 1972, PG leg.; male, VIC, Melbourne Market, - 37.6529°S, 144.9975°E, 31m asl, in damp straw, 1.ii.1941, HW leg.; VIC, Studley Park, August; VIC, East Doncaster, maize cob, - 37.7901°S, 145.0087°E, 210m asl; June 1941, male,VIC, Lerderderg NP, - 37.4379°S, 144.2813°E, 440m asl, log debris, funnel extraction, 1.ix.2013, PG leg.; male, WA, - 33.8500°S, 116.0600°E, 324m asl, Greenbushes, long-term tin mining area, 18.viii.31; Juvenile, male, WA, Perth, - 31.986°S, 115.822°E, 7m asl, 8.viii.31, HW leg .

Redescription based on Australian material. Size. Length up to 1.3 mm (n=23) (1.0– 1.7 mm excluding antennae).

Colour. As in Fig. 2 L–M, with sexual dimorphism.

Head. Antennal length 770 μm, 2–3 times the length of the head, Ant IV with a simple or bilobed apical vesicle. Relative lengths of Ant I/II/III/IV=1/2.0/2.1/2.4. Four spinulate labral papillae. Four prelabral ciliated chaetae and 5,5,4 smooth labral chaetae, Lateral process of labial papilla E reaching or surpassing the papilla tip. Posterior labial row with MREL 1 L 2 ciliated chaetae, R smaller than M. 8 eyes, G and H smaller than E and F.

Thorax and abdomen. Ratio length of Abd IV/III> 4.

Trochanteral organ with 12–14 chaetae, Unguis with 4 teeth on internal edge: the first pair at 50–60% distance from the base of the unguis, and 2 unpaired teeth, first one at 70–75% distance from the base and the most distal one minute. Dorsal tooth approximately at the level of an internal pair of teeth or intermediate with basal part of the unguis. Unguiculus spike–like, with a smooth external edge on leg III. Furca length 557 μm (n=22). Manubrial plate with 4 chaetae and 2 psp. Mucro with 2 teeth, subapical tooth in size similar to the apical one. Mucronal spine present.

Chaetotaxy. Simplified formula: 3,1,0, 3,2/2,3/1,2/1,1(2),1/0,2(3),3,2,2. Head chaetotaxy ( Fig. 29A ): H1 area with A n2, An 2a1 and An 3, H2 area with A 5. With M 1 –M 4 medial Mac. H3 area without S’ 0. Complete series of S 0 –S 5 present. Thoracic chaetotaxy with Area T1 on Th II with 2 Mc (m 1 and m 2i present) ( Fig. 29B ). Area T2 on Th II with 3 Mc present (a 5, m 4 and m 4i). Abdominal chaetotaxy Area A1 on Abd II with 1 Mc (a 2) as in Fig. 29C and area A2 on Abd II with 2 Mc (m 3 and m 3ea. Abd III with 1 Mc on areas A3, A4 and A5 (in some specimens there 2 Mc a 2 and a 3). Abd IV (fig. 29D) with Mc A 2, A 4 –A 6, B 4 –B 6 (B 2 present in some specimens) and C 1 or E 1 and C 2a.

Remarks. Womersley (pp 110–111, 1934) identified Entomobrya clitellaria Guthrie, 1902 from Australia, finding two forms of E. clitellaria that do not differ from that described from Minnesota and another form that he calls var. newmani . Both forms he studied come from either Western Australia or South Australia, as well as from Studley Park, Victoria, collected in August 1931. There is confusion on the name because E. clitellaria ( Fig 23 ) is blueblack from Th II to Abd III, while the specimens described by Womersley have with this pigment from the posterior border of Th II to Abd I, and lack colour elsewhere. This is similar to males of E. nigrocincta sensu Jordana, 2012 , while the females are similar to E. multifasciata in colour. Australian material from different localities conforms to the colour of E. nigrocincta sensu Jordana, 2012 .

The South Australian ( Figs 29 F–G) specimens have small differences in chaetotaxy from European specimens. This can be interpreted as typical of a founder population. In Europe, E. nigrocincta is a corticolous and arboreal species, while in Australia it lives on the soil surface. As well as chaetotaxic differences, there is some colour differentiation, in that males are yellow and the females white with transverse bands like E. multifaciata . On the specimens with 1,2,1 Mc on Abd III (Australian specimens), the male colour is white as the female, but the colour distribution is as European E. nigrocincta specimens (see figure 29E–F). Katz (2015) does not distinguish between E. nigrocincta and E. atrocincta but Jordana (2012) considers them separate species.

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 23. Entomobrya lamingtonensis sp. nov. Line drawings A–J: A, Ant organ III (bar=0.005 mm); B, labral papillae (bar=0.010 mm); C, trochanteral organ (bar=0.020 mm);; D, unguis, leg 3 (bar=0.020 mm); E, manubrial plate (bar=0.020 mm); F, tip of dens and mucro (bar=0.020 mm); G, head chaetotaxy; H, Th II chaetotaxy; I, Abd II–III chaetotaxy; J, Abd IV chaetotaxy. Bar for G–J=0.050 mm.

FIGURE 29. Entomobrya nigrocincta Line drawings A–G: A, head chaetotaxy; B, Th II chaetotaxy; C, Abd II–III chaetotaxy; D, Abd IV chaetotaxy. Open circles unstable Mc. (Sensillum at level B5 Mc on Abd IV with 0.015 mm of length, other sensilla 0.025 mm of length); E–G, colour and chaetotaxy of European vs Australian specimens with its chaetotaxy formula. Open circles mean unstable Mc. Bar=0.05 mm.