Entomobrya bicincta Jordana & Baquero, 2021

Baquero, Enrique, Potapov, Mikhail & Jordana, Rafael, 2021, New species and a new record of Entomobryinae (Collembola, Entomobryomorpha) from Amurskaya Region (the Far East of Russia), Zootaxa 4969 (1), pp. 119-134 : 125-126

Entomobrya bicincta Jordana & Baquero sp. nov.

http://zoobank.org/ 6C824A10-4FD1-44CB-8292-32DD7CF82574

Figs 2B , 4A–E

Type material. Holotype: female on a slide, RUSSIA, Amurskaya Region , ~ 3 km NE Arkhara, top of a hill, dry young oak-forest, litter, (49.47551, 130.12499), 17.viii.2014, cod AO2014-2R-13 . Paratypes: same data as Holotype, three females on slide (AO2014-2R-14 to 16); 1 female on a slide (AO2014-19R-01), Khingansky Reserve , Kundur, in grass turf (49.103646, 130.758800, 168 m a.s.l.), 19.iv.2018, hand collection. All Potapov, M. and Kuznetsova, N. leg.

Diagnosis. The unequivocal identification of the species can only be done using the abbreviated formula of head (H1–5 areas), Th II (T1–2 areas), Abd II (A1–2 areas), Abd III (A3–5 areas), and Abd IV (A6–10 areas) Mc, that for it is: 3-1(2)-0-3-2/3-5/2-4(3)/0-2-1/0-0-2-2-2.

Description. Body length (excluding antennae) 1.10mm (n =1). Ground colour white or very pale, with pigment between the eyes, antennae, front and anterior Th II, more than half posterior Th III, complete dorsal Abd III, two dorsolateral patches on Abd IV, and lateral bands on AbdV–VI.

Head. Eight eyes, GH slightly smaller than EF. Antennae length 0.40mm, 2.05 times the length of the head (n =1); Ant IV with bilobed apical vesicle and pin chaeta present; subapical organite very small (drumstick shape); sensory organ of Ant III with the special sensilla long-ovoidal, and three guard additional sensilla; relative length of Ant I/II/III/IV=1/2.00/2.00/3.00 (n =1). Prelabral chaetae ciliated. Labral papillae almost smooth (a slight irregularity was observed). Lateral process of labial papilla E not reaching its apex. Maxillary palp bifurcate, with three sublobal chaetae.

Body. Length ratio of Abd IV/III=3.75 (n =1). Trochanteral organ with approximately eight chaetae. Tibiotarsus not sub-segmented, without smooth chaetae, except for smooth terminal chaeta on leg III. Claw with four inner teeth: paired teeth at 50% from the basis and first unpaired at 75% from the basis, second unpaired; subapical unpaired dorsal tooth basal ( Fig. 4E ). Empodium lanceolate, with smooth external lamella (pe) in leg III. Tenent hair clavate, longer than the claw. Length of manubrium and dens 0.20 and 0.21 mm, respectively (n =1). Manubrial plate with three chaetae and two pseudopores. Mucro with teeth similar in size, mucronal spine reaching the tip of the subapical tooth; area not crenulated of dens two times the length of mucro.

Macrochaetotaxy ( Figs 4A–D ). Simplified Mc formula: 3-1(2)-0-3-2/3-5/2-4(3)/0-2-1/0-0-2-2-2. Head: H1 area with Mc An 2, An 3a1, and An 3; H2 area with one Mc (A 5) and sometimes an additional chaeta (A 6); H4 area with three Mc (S 1, S 3, and S 4i); H4’ area with three Mc (S 5, S 5i, and S 4); H5 area with Ps 2 and Ps 5 Mc. Mesothorax: area T1 with three Mc (m 1, m 2, and m 2i); T2 with five Mc (a 5, m 4, m 4p, m 4i, and m 5). Abdomen: Abd II area A1 with two Mc (a 2 and a 3), area A2 with four Mc (m 3, m 3ep, m 3e, and m 3ea; one specimen from sample 2R has lacked Mc m 3ea); Abd III without Mc on A3, two on A4 (a 2 and a 3) and one on A5 (m 3); Abd IV without Mc on A6 and A7 areas, two on A8 (A 4 and B 4), two on A9 (A 5 and B 5), two on A10 (A 6 and B 6); sensillar formula from Th II to Abd V normal as in the rest of Entomobryinae : 2,2/1,2,2,7,3; microsensillar formula from Th II to Abd III: 1,0/1,0,1.

Ecology. Unknown.

Etymology. The specific epithet refers to the pigmented transversal bands on Th III and Abd III.

Remarks.

This species shares the dorsal macrochaetotaxy of Abd II–III with E. amurica sp. nov. Further comparisons are presented in the remarks of the late species (see also Table 1 ).

Figures

FIGURE 2. Colour patterns of the new species.A. Entomobrya amurica sp. nov.; B, E. bicincta sp. nov.; C, E. mediostriata sp. nov.; D, E. umbroviolacea sp. nov.; E, Willowsia babykinae sp. nov. (scale bars: 0.2mm).

FIGURE 4. Entomobrya bicincta sp. nov. A, head chaetotaxy; B, ThII dorsal macrochaetotaxy; C, AbdII–III dorsal macrochaetotaxy; D, AbdIV dorsal macrochaetotaxy; E, claw and empodium (scale bars: A–D, 0.1mm; E, 0.025 mm).