Tetracanthella wui

Xie, Zhijing, Potapov, Mikhail & Sun, Xin, 2019, Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China, Zootaxa 4585 (3), pp. 573-580: 578-580

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Tetracanthella wui

sp. nov.

Tetracanthella wui  sp. nov.

Figs 2View FIGURES 1–2, 12–20View FIGURES 12–17View FIGURES 18–20, 22, 23View FIGURES 21–23

Type material. Holotype: female, China. Jilin province. Changbai Mts. , 141.75801°N 127.93890°E, 1700 m alt., 13.IX. 2015, 10 cm deep coniferous forest soil, leg. Donghui Wu; paratypes: 1 paratype collected on 15.V.2015 and 3 paratypes on 05.VIII.2009 from the same site  . Holotype and 2 paratypes are deposited in Northeast Institute of Geography and Agroecology, CAS ( Changchun , China), 2 paratypes––in Moscow State Pedagogical University (Moscow, Russia)  .

Description. Body length about 1.6 mm (based on largest subadult male and female specimens). Body rather broad. Coloration spotty, dark. Antennae unpigmented, with dark tips ( Fig. 23View FIGURES 21–23). The largest polygons of cuticular reticulation subequal to mesochaeta socket ( Fig. 22View FIGURES 21–23). Canals between polygons well marked, smooth fields absent. Dorsal mesochaetae of medium size, not shortened in axial part of tergites, in posterior row of Abd. IV longer than on other parts of body (Md/p1 = 1.2–1.3). Abd. IV with p3 slightly longer than p1 (1.1–1.3). Macrochaetae middlesized and acuminate.

8+8 ocelli, G and H reduced (dcA: dcH = 1.5–2.0). PAO short, about 2.2–2.5 times longer than ocellus A. 4 prelabral chaetae. Outer maxillary lobe with 4 sublobal hairs and simple maxillary palp. Labium with complete set of guards [A(1)B(4)C(0)D(4)E(7)], papilla E with 7 guards (e7 present), 3 proximal and 4 basomedian chaetae. 4– 5+4–5 postlabial chaetae. Frontal chaeta ap present.

Axial chaetotaxy of body 12,8/6,6,6,6 ( Figs 15View FIGURES 12–17, 18, 19View FIGURES 18–20). Macrochaetotaxy: 3(A),3(A)/3,3(5),3(5) (A: Mdl macrochaetae in anterior position). Abd. II and III with 2 additional macrochaetae on each side, these macrochaetae weakly developed on Abd. I. Corner mesochaetae on Th. II and III slightly stronger than other mesochaetae of prow. Number of s-chaetae: 3,3/2,2,2,2,4 (s), 1,1/1,1,1 (ms). S-chaetae of medium size, medial ones on Abd. I–III arranged lateral to Mdl macrochaetae. Sternite of Th. III without chaetae.

Coxa I without an external chaeta. Tibiotarsi with 1,2,2 dorsal tenent hairs acuminate and ventral tenent hair hardly developed ( Fig. 20View FIGURES 18–20). Tibiotarsi I and II with 21 chaetae each, tibiotarsus III with 25–26 chaetae. Empodial appendage 0.6–0.7 of inner edge of claw in length. Ventral tube with 4 posterior chaetae. Retinaculum with 4+4 teeth and 1 chaeta. Anterior furcal subcoxa with 3–4 chaetae, posterior one with 6–10 chaetae. Manubrium with 9– 11+9–11 dorsal chaetae, including 3+3 on baso-lateral flaps ( Fig. 16View FIGURES 12–17). Mucro bidentate, compact. Dens with 1 anterior and 5 posterior chaetae ( Figs 16, 17View FIGURES 12–17), dens: claw III = 1.6–1.8. Manubrium: dens: mucro = 7.8–9.6: 4.0– 4.7: 1.

Anal spines parallel, small, on low and not sclerotised papillae. Medial mesochaetae (a1) of Abd. V slightly in front of medial macrochaetae (a2). Macrochaetae of Abd. VI stiff and set together forming a cluster ( Figs 13, 14View FIGURES 12–17). Males present.

Remarks. The new species belongs to the asiatic ' stebaevae ' group with 3,3,3 main macrochaetae on Abd. I– III, respectively. It resembles species having numerous chaetae on furca: T. czernovae Kutyreva, 1980 (south part of the Far East of Russia) and T. antoni Potapov, 1997 (East Siberia, Russia), with 6 and 5 chaetae on posterior side of dens, respectively. The new species differs from T. czernovae by fewer chaetae on anterior side of dens (1/5 vs. 2–3/6) and from T. antoni by more chaetae in axial group of Abd. I–III (6,6,6 vs. 4,4,4).

Distribution. It is known only from Changbai Mountain massive in northeast China.

Derivatio nominis. The species is named after Dr. Donghui Wu, whose scientific activity made considerable input to knowledge of fauna of Collembola  of Changbai Mountains.


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