Entomobrya karta, 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: 42

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Entomobrya karta

sp. nov.

Entomobrya karta   sp. nov.

( Figs 2C View FIGURE 2 , 4L View FIGURE 4 , 21 View FIGURE 21 A–F)

Holotype. Female marked specimen ( LHS) on the slide with two specimens. SA, Kangaroo Island, Rocky River mouth; - 35.965°S, 136.653°E; 3m asl, under stone, 7.iv.1972, PG leg., [ SAMA 22650–01 View Materials ]. GoogleMaps  

Paratypes. Female on the same slide ( RHS), SA   , Kangaroo Island , D’Estrees Bay, - 35.9295°S, 137.5966°E, 5m asl, under stone, 6.ix.1972, PG leg., [ SAMA 22650–02 View Materials ] GoogleMaps   .

Other material examined. Two specimens cleared. NSW, Nundle, - 31.4628°S, 151.126°E, 600m asl, under wet stones, 9.v.1974, PG leg. [ SAMA]. One specimen on this slide is a juvenile of a uniform bluish colour, with chaetotaxy of Abd IV reduced GoogleMaps   .

Description. Size. Length up to 2.179 mm excluding antennae.

Colour. Ground colour beige with a some faded stripes of violet colour on the lateral and posterior part of Th II, posterior stripe on Th III–Abd III and two lateral bands on each side of Abd IV. Legs and antennae dark blue and short. Head with an anterior black spot between antennae, the ocular spot black.

Head. Eight eyes, G and H smaller in size than E and F. Antennal length 810 μm, twice the length of the head. Ant IV with bilobed apical vesicle; relative length of Ant segments: 1/2.5/1.9/2.7. Labium with MREL 1 L 2 ciliated chaetae, R 2/3 of M in length. External process of labial papilla E not reaching at the papilla tip. Four labral multispinate papillae. Four prelabral chaetae ciliated and labral chaetae 5,5,4 smooth.

Thorax and abdomen. Length ratio of Abd IV/III=3.3. Tibiotarsus without differentiated chaetae, with exception of the presence of the smooth terminal chaetae on legs 3, characteristic for the genus. Unguis ( Fig. 21F View FIGURE 21 ) with 4 teeth: paired at 33% of the base and long for an Entomobrya   , first unpaired at 75 % from the base and small; lateral and dorsal teeth basal. Unguiculus acuminated, a little broad in its 1/3 basal, external lamella serrated. Tenent hair clavate, longer than unguis. Trochanteral organ with near 24 chaetae. Manubrial plate with 4 chaetae and 2 pseudopores. Mucro bidentate anteapical tooth smaller than apical one, mucronal basal spine reaching the tip of the subapical tooth, Mucro of 14 micrometers and not annulated dens two times the length mucro ( Fig. 21E View FIGURE 21 ).

Macrochaetotaxy. Simplified Mc formula: 3,1,0,2,2/3,4/2,2/0,0,1/2,3,2,3,3. Head chaetotaxy ( Fig. 21A View FIGURE 21 ) An 2, An 3a1, An 3 and A 5 Mc. Only 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. Ps 2 and Ps 5 present. Thoracic chaetotaxy of Th II ( Fig. 21B View FIGURE 21 ) with Mc m 1, m 2 and m 2i on T1 area, on T2 area with Mc a 5, a 5’ (as mesochaeta) m 4, m 4i and m 5. Abdominal chaetotaxy ( Fig. 21C View FIGURE 21 ) of Abd II with a 2 and a 3, m 3 and m 3e, on Abd III only m 3 Mc present on A5 area, Abd IV ( Fig. 21D View FIGURE 21 ) with Mc A 1, A 3 –A 6, A i2, A e5pp, B 3 –B 6, B e3 and E 1. Sensillary formula as normal for Entomobrya   , the bothriotricha on Abd IV in position T 2 and T 4 (0110).

Remarks. The chaetotaxy as Abd II and III (2,2/0,0,1) approximates to that of E. regina   sp. nov. and to some variations of E. varia   , but the chaetotaxy of Th II separates them definitively. Th II of E. karta   sp. nov. has Mc m 1, m 2, m 2i2, a 5, m 4, m 4i and m 5 (and usually a 5’) while E. regina   sp. nov. has the Mc m 2i, a 5, m 4 and m 4i, and E. varia   has the Mc m 1, a 5 and m 4.

Etymology. The name refers to the ancient culture of indigenous people of the island.


Museum national d'Histoire Naturelle, Laboratiore de Paleontologie


Plant Pathology, The Royal Horticultural Society


Royal Botanic Gardens, National Herbarium of New South Wales


South Australia Museum