Oligaphorura chankaensis, Sun, Xin & Wu, Donghui, 2012

Sun, Xin & Wu, Donghui, 2012, Two new species of the tribe Oligaphorurini Bagnall, 1949 (Collembola: Onychiuridae) from northeast China, Zootaxa 3526, pp. 45-52: 49-52

publication ID

http://doi.org/ 10.5281/zenodo.282740

publication LSID

lsid:zoobank.org:pub:8CA5233B-3ACF-4F91-BD47-DBA8FC719C6D

persistent identifier

http://treatment.plazi.org/id/03C81B31-FFFE-8D20-86EC-C4CAB4A87CEC

treatment provided by

Plazi

scientific name

Oligaphorura chankaensis
status

sp. nov.

Oligaphorura chankaensis   sp. nov.

Figs 16–28 View FIGURES 10 – 16 View FIGURES 17 – 23 View FIGURES 24 – 28

Type material. Holotype female, 2 females and 6 males paratypes. China: Heilongjiang Province: Lake Khanka (alt. ca 70m, 45 ° 19 ' 32 " S, 132 ° 31 ' 59 " W), litter and soil, Berlese extraction, 18.IX. 2011, leg. Wu Haitao and Song Lihong. Holotype and 8 paratypes on slides are deposited in the Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun.

Description. Body color white in alcohol. Size 0.8–0.85 mm in females, 0.7–0.8 mm in males; holotype: 0.8 mm. Body slender and elongated.

Pseudocellar formula dorsally: 43 / 144 / 5556 (7) 4 (5–6), ventrally: 11 /000/00000; subcoxa 1 of legs I –III with 1 pso each ( Figs 17, 22–26 View FIGURES 17 – 23 View FIGURES 24 – 28 ). Parapseudocellar formula ventrally 00/000/ 222301, absent dorsally ( Figs 17 & 23 View FIGURES 17 – 23 ); subcoxa 1 of legs I –III with 1, 2 and 2 or 3 psx each ( Fig. 17 View FIGURES 17 – 23 ). Pseudopore formula dorsally: 00/011/ 111100, ventrally: 00/ 111 /000 x00 ( Figs 17 & 23 View FIGURES 17 – 23 ).

Head. Antennae short and distinctly segmented, as long as head. Length ratio of antennal segments I: II: III: IV = 1: 2: 2: 2. Ant. IV with two distinct thickened S-chaetae, subapical organite with apex globular and basolateral ms just above posterior chaetae ( Fig. 19 View FIGURES 17 – 23 ). Ant. III sensory organ composed of 5 papillae, 5 guard chaetae, 2 small sensory rods, 2 granulated sensory clubs, the outer about twice as large as the inner, and a lateral ms ( Figs 19–20 View FIGURES 17 – 23 ). Ant. II with 14 chaetae. Ant. I with 9 chaetae. Antennal base with distinct granulation ( Fig. 18 View FIGURES 17 – 23 ). PAO located on cuticular furrow built with a 3 -lobed vesicle ( Fig. 18 View FIGURES 17 – 23 ). Dorsal cephalic chaeta d0 absent, 3 + 3 p-chaetae between posterior a-pso on head ( Fig. 17 View FIGURES 17 – 23 ). Mandible with a strong molar plate and 4 apical teeth. Maxilla bearing 3 teeth and 6 lamellae. Maxillary palp simple with 1 basal chaeta and 2 sublobal hairs. Labral chaetae formula 4 / 342. Labium with 6 proximal, 4 basomedian (E, F, G, f) and 6 basolateral (a, b, c, d, e, e’) chaetae; labial type ABC, papillae A –E with 1, 4, 0, 3, and 2 guard chaetae respectively ( Fig. 21 View FIGURES 17 – 23 ). Postlabial chaetae 4 + 4 along ventral groove ( Fig. 25 View FIGURES 24 – 28 ).

Body chaetotaxy. S-chaetae cylindrical, well differentiated, their formula dorsally: 11 /011/ 222111, ventrally: 11 /000/000100 ( Figs 17 & 23 View FIGURES 17 – 23 ); subcoxae 2 of legs I, II and III with 0, 0 and 1 S-chaeta, respectively. Smicrochaetae tiny and blunt, present on Th. II –III ( Fig. 17 View FIGURES 17 – 23 ). Ordinary chaetae differentiated in meso- and macrochaetae. Th. I tergum with 7 + 7 chaetae. Th. II –III and Abd. I –III terga with three chaetae on both sides of axial line, without dorsal axial chaetae ( Fig. 17 View FIGURES 17 – 23 ). Abd. IV tergum with one or two asymmetric chaetae, Abd. V tergum without axial chaetae, Abd. VI tergum with two axial chaetae ( Fig. 17 View FIGURES 17 – 23 ). Th. I, II and III sterna without chaetae.

Appendages. Subcoxa 1 of legs I –III with 4, 5 and 5 chaetae ( Fig. 17 View FIGURES 17 – 23 ), subcoxa 2 with 1, 4 and 4 chaetae, respectively. Tibiotarsi of legs I, II and III with 20 (11, 8, 1), 20 (11, 8, 1) and 19 (11, 7, 1) chaetae, respectively ( Fig. 22 View FIGURES 17 – 23 ). Unguis without teeth. Unguiculus slender and pointed, 0.6 times as long as inner edge of unguis, with inner basal lamella ( Fig. 22 View FIGURES 17 – 23 ). Ventral tube with 6–7 + 6–7 distal chaetae and 2 + 2 basal chaetae, without anterior chaetae. Furca reduced to a small cuticular fold with 2 + 2 dental chaetae in two rows posteriorly; two manubrial rows of chaetae present posteriorly to dental chaetae ( Fig. 27 View FIGURES 24 – 28 ).

Female genital plate with 10–13 chaetae ( Fig. 23 View FIGURES 17 – 23 ), male genital plate with 26–28 chaetae. Anal valves with numerous acuminate chaetae; each lateral valve with a0 and 2 a 1; upper valve with chaetae a 0, 2 b 1, 2 b 2, c 0, 2 c 1, 2 c 2 ( Fig. 28 View FIGURES 24 – 28 ). Anal spines present on indistinct papillae, 0.9 times as long as inner edge of unguis.

Etymology. Named for the name of the lake where we found the new species.

Ecology. Found in coniferous and broad-leaved mixed forest.

Remarks. Oligaphorura chankaensis   sp. nov. is similar to the Korean O. montana Weiner, 1994   and the Chinese species O. pseudomontana Sun & Wu, 2012   in having the same characters as following: number of pso on dorsal head and Th. I –Th. III terga (43 / 144), ventral pso formula (11 /000/00000) and pso on subcoxa 1 of legs I –III (1,1,1). But it differs from them by the dorsal pso formula (43 / 144 / 5556 (7) 4 (5–6) in the new species versus 43 / 144 / 54453 in O. montana   and 43 / 144 / 54464 in O. pseudomontana   ), the ventral psx formula (00/000/ 222301 in the new species versus indistinct in O. montana   and 00/000/ 222401 in O. pseudomontana   ), the ratio of AS /unguis (0.9 in the new species versus 0.75 in O. montana   and O. pseudomontana   ), the lateral tooth of the unguis (absent in the new species versus present in O. montana   and O. pseudomontana   ) and the psx on subcoxa 1 of legs I –III (1, 2, 2 or 3 psx in the new species versus indistinct in O. montana   and 1, 1, 1 in O. pseudomontana   ).