Oligaphorura ussurica Shveenkova & Babenko

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: 260-265

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Oligaphorura ussurica Shveenkova & Babenko

sp. nov.

Oligaphorura ussurica Shveenkova & Babenko   , sp. nov.

Figs 13–19 View FIGURES 13–16 View FIGURES 17–19 , Tables 1, 2

Type material. Holotype, female on slide, Far East of Russia, Ussuriysky State Nature Reserve , Komarovskoye Forest District, Grabovaya Nipple [N 43.6367°, E 132.3499°], 383 m alt., mixed forest on slope, litter, 24.07.2016, leg. N. Kuznetsova & M. Potapov. GoogleMaps  

Paratypes, female and 2 males, same State Reserve, Komarovskoye Forest District, Turova Nipple , Khripunovsky Pass [N 43.6481°, E 132.3515°], 207 m alt., Pinus koraiensis   forest on slope, litter, 23.07.2016, leg. N. Kuznetsova & M. Potapov. Types are kept in the collection of the Department of Zoology & Ecology, Moscow State Pedagogical University GoogleMaps   .

Description. Size 0.75–0.80 mm in females, 0.6–0.7 mm in males; holotype length about 0.8 mm., color white in alcohol. Body shape cylindrical. Granulation regular, slightly coarser around dorsal pso (10–11 granules) located on head and Abd. IV–V ( Fig. 13 View FIGURES 13–16 ).

Number of pso: 4(1+3)2/144/5(6)5554 (dorsally) and 11/000/0000 (ventrally) ( Fig. 13, 14 View FIGURES 13–16 ). Anterior pso on head located as follows: one inside and three outside antennal area. Number of ventral psx: 0/000/222301+ 1 m ( Fig. 13 View FIGURES 13–16 , 17 View FIGURES 17–19 ). Upper Sc of legs I–III with one pso each and 1, 2, 2 (?3) psx, respectively. Pseudopore present as usual, sometimes not clearly seen.

Antennae somewhat shorter than head. Ant. IV with two slightly thickened S-chaetae, subapical organite present, microsensillum located in proximal row of chaetae ( Fig. 15 View FIGURES 13–16 ). AIIIO consisting of 5 papillae, 5 guard chaetae, 2 sensory rods, 2 granulated clubs (external one larger) and lateral ms ( Fig. 15, 16 View FIGURES 13–16 ). Ant. I–II with 8 and 13 chaetae, respectively. Antennal area well marked, with fine uniform granulation. PAO located laterally in cuticular furrow, with 4 (3) lobes, slightly or 1.5 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) ( Fig. 19 View FIGURES 17–19 ).

Dorsal chaetae poorly differentiated into macro- and microchaetae, symmetrical in general ( Fig. 13 View FIGURES 13–16 ). S-chaetae slightly marked and distributed as follows: 2/011/222111 (dorsally), 2/000/000100 (ventrally) and 0, 0, 1 on lower Sc. Head with two axial unpaired chaetae a0 and a0’, d0 absent as usual for genus. Chaetae p1 on head at level with p2. Th. I with 7+7 dorsal chaetae. Lateral ms present on both Th. II–III. Terga of Th. II–Abd. III with 3–4 pairs of axial chaetae. Axial chaetotaxy of Abd. IV variable with either unpaired chaeta m0 or paired m1 chaetae. On Abd. VI chaeta a0 as long as p0, chaetae a1 about 0.8 of chaeta a0, and a1 shorter than a2 (~0.5 a2). Thoracic sterna without chaetae. Ventral chaetotaxy of abdomen as in Fig. 17 View FIGURES 17–19 .

Upper Sc I–III with 4, (4)5, 5 chaetae, respectively. Tibiotarsal chaetotaxy most complete of genus with 20–20– 19 chaetae, respectively: distal whorl (T+A) with 11 chaetae, 7 B-chaetae (B7 absent only on Ti 3), unpaired chaeta M and one chaeta of C-whorl. Unguis with small lateral teeth (sometimes indistinct), unguiculus narrow with weak basal lamella, about 0.6 times as long as inner edge of unguis ( Fig. 18 View FIGURES 17–19 ). VT with 6–7+6–7 proximal chaetae and 2+2 at its base. Furca reduced to small cuticular fold with 2+2 axial chaetae in two rows posteriorly, also two manubrial rows of chaetae present behind; in other words, furcal area, according to Paśnik & Weiner (2017), with four rows of chaetae: 1+1 dental chaetae and three rows of manubrial chaetae. Each of lateral anal 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 tiny papillae.

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

Affinities. The most characteristic features of O. ussurica   sp. nov. are the presence of 4+4 pso at antennal base together with developed anal spines. Such combination of characters rather rarely occurs among Oligaphorurini   although is known for a number of Asian forms, i.e. O. montana Weiner, 1994   , O. pseudomontana Sun & Wu, 2012   (in: Sun & Wu 2012b) and O. chankaensis   (Sun & Wu, 2012; in: Sun & Wu 2012c). These species, together with O. ussurica   sp. nov. and O. kedroviensis   sp. nov. (see description below), can be combined into a distinct montana   - group, most probably united closely related Asian forms and characterized by the presence of 4+4 pso at antennal base (of them only one anterior pso inside Ant. basis), both Th. II-III with ms, full tibiotarsal chaetotaxy with 11 chaetae in distal whorls, furcal remnant with cuticular fold and 2+2 posterior chaetae and full-sized anal spines. Oligaphorura ussurica   sp. nov. differs from the other known species of this group (excepting O. kedroviensis   sp. nov., see below) by the presence of only 2+2 posterior pso and axial chaetae a0’on the head. O. ussurica   sp. nov. can also be easily distinguished by the number of abdominal pso, i.e. 5(6) 5554 in O. ussurica   sp. nov. vs 54453 in O. montana   and 54464 in O. pseudomontana   . Only O. chankaensis   have a comparable number of abdominal pso [5556(7)4(5-6)] with O. ussurica   sp. nov. but these two species clearly differ in the labial type: ABC in O. chankaensis   vs AC in O. ussurica   sp. nov. Main differences with O. kedroviensis   sp. nov. are listed in Table 1 and remarks to the latter species.

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

Remarks: * – W.Weiner, pers. com.

TABLE 1. Differences between Oligaphorura species of the montana-group.

Species O. montana O. pseudomontana O. chankaensis O. ussurica   sp. nov. O. kedroviensis   sp. nov.
Dorsal pso 43/144/54453 43/144/54464 43/144/5556(7)4(5- 6) 42/144/5(6)5554 42/144/44454
Ventral psx indistinct 0/000/222401m 0/000/222301m 0/000/222301+1m 0/000/222301+1m
Psx on upper Sc indistinct 1, 1, 1 1, 2, 2(3) 1, 2, 2(?3) 1, 2, 2(?3)
Labium type A AC ABC AC AC
Chaeta a0’ on head* absent absent absent present present
Distribution North Korea Northeastern China Northeastern China Russian Far East Russian Far East

Remarks: *—This chaeta [a0’] is present in all adult type specimens of both new species, but absent in a single available juvenile.

TABLE 2. Main diagnostic characters of Oligaphorura species from East Asia and adjacent areas.

Species Dorsal pso Ventral pso pso on Sc Labium Furcal remnant ms on Th. III Others specific traits
          Cuticular fold Posterior chaetae    
O. ambigua 42/133/33354 2/000/1111 222 ABC absent 2+2 absent AIIIO with 4 papillae
O. kedroviensis   sp. nov. 42/144/44454 2/000/0000 111 AC present 2+2 present axial chaeta a0’ on head present
O. ussurica   sp. nov. 42/144/5(6)5554 2/000/0000 111 AC present 2+2 present axial chaeta a0’ on head present
O. chankaensis 43/144/5556(7)4(5-6) 2/000/0000 111 ABC present 2+2 present axial chaeta a0’ on head absent
O. montana 43/144/54453 2/000/0000 111 A present 2+2 present axial chaeta a0’ on head absent
O. pseudomontana 43/144/54464 2/000/0000 111 AC present 2+2 present axial chaeta a0’ on head absent
O. palissai 32/133/33333 2/000/0000 111 ? ? ? ? AIIIO with 4 papillae
O. tottabetsuensis 32/033/33333 2/000/0000 111 ? present 2+2 ? AIIIO with 5 short papillae
O. kurtshevae 33/0(1)44/3334(5)4 1?/000/0000 111 ? present 2+2 ? posterior pso on head in triangular arrangement
O. absoloni 32/133/33343 2/000/0000 111 AC present 1+1 absent AIIIO with 4 short papillae; labrum with 9 chaetae
O. nataliae 32/033/33343 2/000/0000 111 AC present 2+2 absent  
O. sabulosa 32/133/33353 2/000/0000 111 AC present 2+2 absent 0 - 1 - 1 chaetae on thoracic sterna I–III
O. ursi ( Fjellberg, 1984) sensu Babenko   & Fjell- berg 2015 32/133/33343 2/000/0000 111 A present 2+2 absent psx 0/000/212201+1m (ventral); 1- 2(1)-2(1) (subcoxal); 10 guards on labial palp
O. ursi sensu Sun & Wu, 2012 32/133/33343 2/000/0000 111 A present 2+2 absent psx 0/000/122200 (ventral); 000 (subcoxal); 11 guards on labial palp
O. changbaiensis 32/133/44454 2/000/0000 111 ABC present 1+1 present  
O. shifangensis 32/133/33343 2/000/0000 111 AC present 1+1 present  
O. sanjiangensis 32/033/33343 2/000/0000 111 A absent 1+1 present  

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