Entomobrya umbroviolacea

Ecology. Unknown.

Description. Body length (excluding antennae) 1.78 mm (Holotype). Ground colour intense violet, darker on the frontal head, a fine posterior area behind the eyes and antennae; there are some small paler patches on anterior Abd IV (Fig. 2 D). Head. Eight eyes, GH slightly smaller than EF (Fig. 6 A). Antennae length 0.80 mm, 2.03 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 / 2.40 / 2.70 (n = 1). Prelabral chaetae ciliated. Labral papillae with a long projection. Maxillary palp bifurcate, with three sublobal chaetae. Body. Length ratio of Abd IV / III = 6.9 (n = 1). Trochanteral organ with approximately 16 chaetae. Femur III with at least eight smooth chaetae as shown in Fig. 6 B. Tibiotarsus slightly sub-segmented, without smooth chaetae (a double row of wide chaetae with appressed ciliation is present), except for smooth terminal chaeta on leg III. Claw with four main teeth: inner paired at 50 – 60 % and first unpaired at 75 % from the basis, second unpaired minute and subapical; unpaired dorsal tooth basal. Empodium lanceolate, with almost smooth external lamella (pe) in leg III (two or three small indentations present). Tenent hair clavate (Fig. 6 C). Length of manubrium and dens 0.35 and 0.40 mm, respectively (n = 1). Manubrial plate with four chaetae and two pseudopores. Mucro with teeth similar in size, mucronal spine reaching the tip of the subapical tooth; area not crenulated of dens three times the length of mucro. Macrochaetotaxy (Figs 6 A, D – F). Simplified Mc formula: 3 - 1 - 0 - 3 - 3 / 4 - 7 / 2 - 5 / 0 - 2 - 1 / 0 - 2 - 1 - 2 - 2. Head: H 1 area with Mc An 2, An 3 a 1, and An 3; H 2 area with one Mc (A 5); H 4 area with three Mc (S 1, S 3, and S 4 i); H 4 ’ area with three Mc (S 5, S 5 i, and S 4); H 5 area with Ps 2, Ps 3, and Ps 5 as Mc. Mesothorax: area T 1 with four Mc (m 1, m 2, m 2 i, and m 2 i 2); T 2 with seven Mc (a 5, m 4, m 4 i, m 4 p, m 4 pi, and m 5; an additional Mc is present near m 4 i and m 4 pi). Abdomen: Abd II area A 1 with two Mc (a 2 and a 3), area A 2 with five Mc (m 3, m 3 ep, m 3 e, m 3 ea, and m 3 ei); Abd III without Mc on A 3, two Mc on areas A 4 (a 2 and a 3) and one on A 5 (m 3); Abd IV without Mc on A 6 area (B 1 and B e 3 as mes and could be confused with Mc), two on A 7 (A 3 and B 3), one on A 8 (B 4), two on A 9 (A 5 and B 5), and two on A 10 (A 6 and B 6); sensillar formula from Th II to AbdV 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.

Figs 2 D, 6 A – F

Diagnosis. The unequivocal identification of the species can only be done using the abbreviated formula of head (H 1 – 5 areas), Th II (T 1 – 2 areas), Abd II (A 1 – 2 areas), Abd III (A 3 – 5 areas), and Abd IV (A 6 – 10 areas) Mc, that for it is: 3 - 1 - 0 - 3 - 3 / 4 - 7 / 2 - 5 / 0 - 2 - 1 / 0 - 2 - 1 - 2 - 2.

Remarks. E. umbroviolacea sp. nov. is similar to four other species that share a similar dorsal macrochaetotaxy of Abd II – III (E. emiliae; E. pulcherrima; E. leviset a; and E. mediostriata sp. nov.). E. emiliae has a different formula for the head (3 - 2 - 0 - 3 - 2), Th II and Abd IV (3 - 6), labral papillae with a projection but not seta-like, shorter antennae, and a different shape for the claw (dorsal tooth not basal); E. pulcherrima has a different macrochaetotaxy formula for the head (4 - 1 - 0 - 3 - 2), Th II (4 - 4) and Abd IV (0 - 0 - 2 - 2 - 3), labral papillae simple and smooth, antennal apical vesicle simple, a different number of Mc on the manubrial plate and subapical tooth of mucro bigger than the apical one. E. leviseta has a different macrochaetotaxy formula for the head (3 - 1 - 0 - 3,1 b), (the dorsal Abd IV is plurichaetotic, and eyes GH similar in size to EF. The color pattern is too very different when all these species are compared.

Etymology. The specific epithet refers to the uniform violet colour.

Type material. Holotype: female on a slide, RUSSIA, Amurskaya Region, Zeysky Reserve, ~ up from 52 km of road Zeya-Beregovoy, “ 52 km ” station, the valley of Bolshaya Erakingra River, forest, under bark (coordinates 54.085668, 126.873681, 604 m a. s. l.), 21. vii. 2014, hand collection, cod. AO 2014 - 28 R- 01. Paratypes (same data as Holotype): one female on a slide (AO 2014 - 28 R- 02). Kuznetsova, N. and Potapov, M. leg.