Semicerura goryshini Martynova, 1969

Potapov, Mikhail, Xie, Zhijing, Kuprin, Alexander & Sun, Xin, 2020, The genus Semicerura (Collembola; Isotomidae) in Asia, Zootaxa 4751 (1), pp. 105-118 : 115-116

Semicerura goryshini Martynova, 1969

Figs 33–37

Type material. Holotype and one paratype collected in Far East of Russia, the former labelled as: “Д. В., Приморский Край, окр.Владивостока, май 1963, ГорЫШин. Tomocerura (Semicerura) goryshini Martynova, 1969 . Голотип” (F.E. Primorsky Krai, environs of Vladivostok, May 1963, leg. Goryshin, ... Holotype). Kept in Zoological Institute of S.- Petersburg ( Russia).

Other material. China, Jilin province. Fusong County, Manjiang town forest (foothills of Changbai Mts ); 41.96° N, 127.59° E; Mar. 2018; D. Wu leg. Changbai Mts ; 41.847° N, 127.798° E; altitude ca 1100 m; May 2015 and Jul. 2015; D. Wu leg.; forest. Huinan county , Triangle longwan forest; 42.37° N, 126.44° E; Mar. 2018; D. Wu leg. South Korea, Gangwon-do, near Yeongwol, Pal-san Mt. ; 09. Sep. 2017; A. Kuprin leg.; foothills (mixed forest), litter .

Description. Body size of fully adult specimens unknown (1.4 mm in the largest subadult specimen). Abd. V and VI fused, without a wrinkle. Spotty grey, intensity of pigmentation varies, legs and antennae paler. 5+5 ocelli, 4 in anterior group and 1 posterior ( Fig. 36 ). PAO larger (1.6–1.8) than nearest ocellus, 0.5–0.7 as long as Claw III. Ant. I ventrally with 4 long s-chaetae and 3–4 short ones in apical position. Ant. IV with simple subapical pin chaeta and small organite. Labrum with 4/554 chaetae, apical edge with 4 broad ridges. Maxillary outer lobe with trifurcate palp and 4 sublobal hairs. Labial palp with all apical papillae (A–E) and 16 guards, e7 present. 5 proximal chaetae as in S. draconis sp. nov., arranged in two groups (3 and 2). Basal fields of labium with 6 median and 5 lateral chaetae, 7+7 postlabial chaetae along ventral line.

Tibiotarsi with 9–10 acuminate apical chaetae on legs. Claws with strong inner and lateral teeth, unguiculus 0.6–0.7 as long as inner edge of claw, with or without inner tooth. Base of Leg I with 3 outer chaetae. Ventral tube with 4+4 anterior, 8+8 latero-distal and several posterior chaetae with 4 in transversal row. Retinaculum with 4+4 teeth and 3–5 chaetae. Ventral chaetae on thorax absent. Mucro, dens, ventroapical thickening and chaetotaxy of manubrium as in S. draconis sp. nov., type specimens with 2+2 medial spine-like chaetae, two individuals from China with 1+1 and 1+2 chaetae.

Chaetae cover sparse and heterochaetotic. Axial chaetotaxy of Abd. I–IV as 3, 3–4, 4–6, 4–6 (for half of tergite, without consideration of unpaired chaetae). Macrochaetotaxy 2,2/3,3,3,3 (Th. II–Abd. V). Macrochaetae thick, sparsely serrated on anterior half of body, and usually smooth on posterior tergites, on Abd. V 2.9–3.5 as long as claw of Leg III. Sensillar chaetotaxy on Th. II—Abd.V as 4,4/3,3,3,4,6 (s) and 1,1/1,1,1 (ms) ( Fig. 35 ), as in S. draconis sp. nov., apart from Abd. IV that is with 3 long and 1 short accp-s ( Figs 33, 34, 37 ).

Discussion. Our description is based on eight specimens from Russia (types), Korea and China. Consequently, the range of variation given above is possibly underestimated. The new species resembles S. draconis sp. nov. and can occur together with it. See the Discussion of the latter species for their morphological differences.

Distribution and ecology. Semicerura goryshini is distributed in the south of Primorski Krai ( Russia), in northeast China and Korea (Fig. 40).

Figures

FIGURES 33–37. Semicerura goryshini: 33, Abd. III–VI; 34, s-chaetae of Abd. IV–V; 35, macro- and s-chaetae on Abd. II–VI; 36, ocelli and PAO; 37, Holotype, Abd. IV–V (dorsal area).