Entomobrya umbroviolacea 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 : 128

Entomobrya umbroviolacea Jordana & Baquero sp. nov.

http://zoobank.org/ 829F5C76-7558-4063-B6E2-63C4CED6E41F

Figs 2D , 6A–F

Type material. Holotype: female on a slide, RUSSIA, Amurskaya Region , Zeysky Reserve , ~ up from 52km of road Zeya-Beregovoy, “ 52km ” station, the valley of Bolshaya Erakingra River, forest, under bark (coordinates 54.085668, 126.873681, 604m a.s.l.), 21.vii.2014, hand collection, cod. AO2014-28R-01 . Paratypes (same data as Holotype) : one female on a slide (AO2014-28R-02). Kuznetsova, N. and Potapov, M. 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: 3-1-0-3-3/4-7/2-5/0-2-1/0-2-1-2-2.

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. 2D ).

Head. Eight eyes, GH slightly smaller than EF ( Fig. 6A ). 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. 6B . 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. 6C ). 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 6A, D–F ). Simplified Mc formula: 3-1-0-3-3/4-7/2-5/0-2-1/0-2-1-2-2. Head: H1 area with Mc An 2, An 3a1, and An 3; H2 area with one Mc (A 5); 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, Ps 3, and Ps 5 as Mc. Mesothorax: area T1 with four Mc (m 1, m 2, m 2i, and m 2i2); T2 with seven Mc (a 5, m 4, m 4i, m 4p, m 4pi, and m 5; an additional Mc is present near m 4i and m 4pi). Abdomen: Abd II area A1 with two Mc (a 2 and a 3), area A2 with five Mc (m 3, m 3ep, m 3e, m 3ea, and m 3ei); Abd III without Mc on A3, two Mc on areas A4 (a 2 and a 3) and one on A5 (m 3); Abd IV without Mc on A6 area (B 1 and B e3 as mes and could be confused with Mc), two on A7 (A 3 and B 3), one on A8 (B 4), two on A9 (A 5 and B 5), and two on A10 (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.

Ecology. Unknown.

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

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 (3-1-0-3,1b), (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.

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 6. Entomobrya umbroviolacea sp. nov. A, head chaetotaxy; B, trochanter and femur III (the arrows point to the smooth chaetae); C, claw and empodium; D, ThII dorsal macrochaetotaxy; E, AbdII–III dorsal macrochaetotaxy; F, AbdIV dorsal macrochaetotaxy (scale bars: B–C, 0.02 mm; D–F, 0.1mm).