Oligaphorura kedroviensis Shveenkova & Sun, 2019

Sun, Xin, Shveenkova, Yu. B., Xie, Zhijing & Babenko, A. B., 2019, New Oligaphorura species (Collembola: Onychiuridae) from the forests of East Asia, Zootaxa 4661 (2), pp. 256-270 : 266

Oligaphorura kedroviensis Shveenkova & Sun , sp. nov.

Figs 20, 21 , Tables 1 , 2

Type material. Holotype, female on slide, Far East of Russia, Kedrovaya Pad Nature Reserve, Central shelter [N 43.1147°, E 131.4872°], 119 m alt., northern slope, mixed forest with Pinus koraiensis and Abies holophylla , litter, 27.07.2016, leg. N. Kuznetsova & M. Potapov .

Paratypes, 4 females, 1 male, 1 juv., same data as holotype. Types are kept in the collection of the Department of Zoology & Ecology, Moscow State Pedagogical University.

Description. Size 0.8–0.95 mm in females, 0.7–0.8 mm in males; holotype – 0.93 mm, color white in alcohol. Body shape cylindrical. Granulation of body regular, coarser around dorsal pso (9–10 granules) located on head and Abd. IV–V.

Number of pso: 4(1+3)2/144/44454 (dorsally) and 11/000/0000 (ventrally) ( Fig. 20 ). Antennal pso on head located as follows: one inside antennal area and three pso outside this area. Number of ventral psx: 0/000/222301+ 1 m. Upper Sc of legs I–III with one pso each and with 1, 2, 2 (?3) psx, respectively ( Fig. 21 ). Pseudopore present, not always clearly visible.

Antennae slightly shorter than head. Ant. IV with two negligibly thickened S-chaetae, subapical organite present, microsensillum located in proximal row of chaetae. AIIIO consisting of 5 papillae, 5 guard chaetae, 2 sensory rods, 2 granulated clubs (external one larger) and lateral ms. Ant. I–II with 9 and 14 chaetae, respectively. Antennal base marked with fine uniform granulation. PAO located laterally in cuticular furrow, with 4 (3) lobes, about 2 times larger than nearest pso. Maxilla unmodified. Maxillary palp simple with 1 basal chaeta and 2 sublobals. Labrum with 4/342 chaetae. Labium with 6 proximal, 4 basomedian, 6 basolateral chaetae and 10 guards (6 long, 4 spiniform), terminal sensilla of papillae A and C thickened (labium of AC type).

Dorsal chaetae poorly differentiated into macro- and microchaetae, symmetrical in general ( Fig. 20 ). S-chaetae well developed, located as follows: 2/011/222111 (dorsal), 2/000/00010(1)0 (ventral) and 0, 0, 1 on lower Sc. Head with two axial unpaired chaetae a0 and a0’, without d0. Chaetae p1 on the head at level with p2. Th. I with 7+7 dorsal chaetae. Lateral ms present on both Th. II–III. Axial chaetotaxy of Abd. IV variable with or without unpaired chaetae m0. On Abd. VI chaetae a0 as long as p0, chaetae a1 rather short (~0.5 a0 and 0.4 a2). Sterna of Th. I–III without chaetae. Ventral chaetotaxy of abdomen as in Fig. 21 .

Upper Sc of legs I–III with 4, 5(4), 5 chaetae, respectively. Tibiotarsi of legs I–III with 20–20–19 chaetae, respectively, 11 chaetae on their distal whorls. Unguis with small lateral teeth (sometimes indistinct), unguiculus with narrow basal lamella, about 0.6 times as long as inner edge of unguis. VT with 6–7+6–7 distal chaetae and 2+2 at base. Furca reduced to small cuticular fold with 2+2 axial chaetae in two posterior rows, two manubrial rows of chaetae also present behind; or, according to Paśnik & Weiner (2017), furcal area bearing four rows of chaetae: one anterior dental with 1+1 chaetae and three posterior rows of manubrial chaetae. Each of anal lateral valves with a0, 2a1 chaetae, upper valve with a0, 2b1, 2b2 and 5 chaetae in c-row (b0 and a1 absent). Anal spines short, set on very small papillae.

Etymology. The species is named after Kedrovaya Pad Nature Reserve, an area of its type locality.

Affinities. Oligaphorura kedroviensis sp. nov. belongs to the same montana -group, all known species of which are characterized by the presence of anal spines and 4+4 pso on antennal base. O. kedroviensis sp. nov. is most similar to O. ussurica sp. nov. having the same number of pso on a head and thoracic terga and axial a0’ chaetae on head, the same psx formula and comparable differentiation of sensilla on the body. Nevertheless, less number of dorsal abdominal pso, i.e. 44454 in O. kedroviensis sp. nov. vs 5(6) 5554 in O. ussurica sp. nov., can easily distinguished these species (see also Table 1 ). Also O. kedroviensis is slightly larger (0.8–0.95 vs 0.6–0.8).

Distribution and ecology. The species is so far known only from litter of mixed forests of the Southern Primorye.

Figures

FIGURES 20–21. Oligaphorura kedroviensis sp. nov.: 20, dorsal chaetotaxy; 21, ventral chaetotaxy of abdomen. Scale 0.1 mm.