Entomobrya womersleyi Bagnall, 1939

Jordana, Rafael & Greenslade, Penelope, 2020, Biogeographical and ecological insights from Australasian faunas: the megadiverse collembolan genus, Entomobrya (Entomobryidae), Zootaxa 4770 (1), pp. 1-104: 84-87

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Entomobrya womersleyi Bagnall, 1939


Entomobrya womersleyi Bagnall, 1939  

( Figs 3N View FIGURE 3 , 45 View FIGURE 45 A–H, 46A–C)

Entomobrya maritima Womersley, 1934   , nom. praeoc. nec. Reuter 1891

Lectotype. Label states “ Entomobrya maritima   sp. nov., SA., Christies Beach, - 35.1350°S, 138.4770°E, 2m asl, 17.i.32, H. Womersley leg., Co-Type” On the slide was one cleared specimen so difficult to observe, [ SAMA I 22277 View Materials ]. GoogleMaps  

Paralectotype. The same label as lectotype, SAMA slide I 22545 View Materials . Specimen deteriorated, broken in many pieces   .

Other material examined. SAMA: Slide 1 with three specimens, 2 males and female, labelled: “ South Australia, Yorke Peninsula, Southern Head , N of Innes N. P., - 34°21′0″S 137°37′0″E, 2m asl, under stones between tides GoogleMaps   ,

4.ix.75, PG leg., det. as Entomobrya womersleyi Bagnall   , LA/Hoyer.” Slide 2 with the same label as slide 1 with three specimens, 2 male, 1 female. Slide 3 with 1 subadult female, 1 female and 1 juvenile. “ South Australia, Yorke Peninsula, Daly Head, Innes N. P., - 35.0293°S, 136.9303°E 2 m asl, 2.ix.75, PG leg., det GoogleMaps   .

Redescription. Size. Length up to 1.67 mm excluding antennae (holotype). (n=5 at 1.257 mm).

Colour. Uniform pale yellow. “Head with a dark spot between the antennae connected by a black line to the black ocellar patches. The third abdominal segment with posterior edge black, then a lighter line followed by a dark irregular band; abdomen IV with an irregular dark cross band placed rather beyond the middle. Posteriorly on abdomen IV a pair of lateral black spots.” ( Womersley, 1934).

Head. Eight eyes, A, C and D= 30 µ, B= 35 µ, E and F= 25 µ, G and H= 20 µ. ( Fig. 45A View FIGURE 45 ). Antennal length 935 μm, 3 times the length of the head (n= 9). Ant IV with bilobed apical vesicle without adjacent pin chaeta; a small rod and small sensillum near the tip of Ant. IV. Relative lengths of Ant I / II / III / IV =1/2.2/2.1/2.5 (n= 9). Sensory organ of Ant III with rod–-like sensillum in addition to the 3 guard sensilla ( Fig. 45B View FIGURE 45 ); Ant I with 3 smooth chaetae at its base. Four labral papillae with 0–2 projections each. ( Fig. 45C View FIGURE 45 ). Labral formula 4/554, 4 prelabral chaetae ciliated, labral chaetae smooth. Labial chaetae MREL 1 L 2 all ciliated, only with one M, and R smaller than other (80% of M). Five rows of postlabial ciliated chaetae   .

Thorax and abdomen. Ratio of lengths of Abd IV/III=4 (n=10). Trochanteral organ with 15–17 chaetae. Tibiotarsus without differentiated chaetae, with exception of the presence of the smooth terminal chaetae on legs 3, characteristic for the genus, and a longer, ciliated and pointed chaetae at the first third of tibiotarsus 3. Unguis length 60 μm. Unguis with 4 teeth: paired at 35–40% of the base and first unpaired at 70% from base; lateral teeth at the level of paired ones ( Fig. 45D View FIGURE 45 ). Unguiculus truncated, 35 μm, with external smooth lamella. Tenent hairs clavate, 65 μm. Length of manubrium and dens 327 and 447 μm respectively (n=10). Manubrial plate with 4 chaetae and 2 pseudopores. Mucro bidentate with anteapical tooth smaller than apical one, with mucronal basal spine reaching tip of the subapical tooth. Length of apical smooth part of dens a little longer than mucro ( Fig. 45I View FIGURE 45 ).

Macrochaetotaxy. Simplified Mc formula: 3,1,0,2,2/3,5/2,4/1,0,1/1(2,1 0 8(11),1 0 6(7),3(6),4(5). Head chaetotaxy ( Fig. 45E View FIGURE 45 ) An 1 mes, An 2, An 3a1 and An 3 Mc type 1 ( Fig. 45 View FIGURE 45 Fa). A 0, A 2 A 3 A 5 Mc type 2 ( Fig.45 View FIGURE 45 Fb). M 1, 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 (all of them as Mc type 2). Ps 2 (Mc type 2) and Ps 5 present. Some variations present in paratypes: S 0 present as mes in a paratype, and Ps 2 could be a mes in a paratype. Thoracic chaetotaxy with T1 having m 2, m 2i and m 2i2 Mc (in one specimen of 10 m 1 present as Mc); T2 area on Th II with 5 Mc (a 5 and m 4, m 4i, m 4p and m 5) ( Fig. 45G View FIGURE 45 ).

Abdominal chaetotaxy.; Abd II with a 1 present as Mc. A 1 area on Abd II with a 2 and a 3 Mc and A2 area on Abd II with 4 Mc (m 3, m 3ep, m 3ei and m 3e) ( Fig. 45H View FIGURE 45 ). Abd III with 1 Mc on areas A3 and A5, and no Mc on area A4 (a 1 and m 3) ( Fig. 46A View FIGURE 46 ). Abd IV macrochaetotaxy ( Fig. 46B View FIGURE 46 ) plurichaetotic, with B5 as Mc Type 2 (fig. 46C)   .

Remarks. Womersley (1934), described a new Australian marine littoral species of Entomobrya   as E. maritima   , but this name was used by Reuter in 1891. Bagnall (1939) renamed the species as Entomobrya womersleyi   . The original description is poor and lacking in detail, as well as containing some errors and only the three figures. Womersley’s (1934) description of the colour and mucro only are useful.

The above text is a redescription from the lectotype and complementary material captured by P. Greenslade. The species is restricted to a marine littoral habitat on South Australian coasts an unusual habitat for the genus. It is found under stones just below high tide mark. At high tides the animals aggregate under stones in a cavity surrounded by algae and shed skins giving some protection to salt water inundation.


Museum national d'Histoire Naturelle, Laboratiore de Paleontologie


South Australia Museum


Departamento de Geologia, Universidad de Chile














Entomobrya womersleyi Bagnall, 1939

Jordana, Rafael & Greenslade, Penelope 2020

Entomobrya maritima

Jordana & Greenslade 2020

Entomobrya maritima

Womersley 1934