Thalassaphorura tibiotarsalis, Sun, Xin, Chen, Jian-Xiu & Deharveng, Louis, 2010

Sun, Xin, Chen, Jian-Xiu & Deharveng, Louis, 2010, Six new species of Thalassaphorura (Collembola, Onychiuridae) from southern China, with a key to world species of the genus, Zootaxa 2627, pp. 20-38 : 35-36

publication ID	https://doi.org/ 10.5281/zenodo.198236
DOI	https://doi.org/10.5281/zenodo.5668537
persistent identifier	https://treatment.plazi.org/id/761E3C0C-5E5C-903F-FF78-F93DFA80F98E
treatment provided by	Plazi
scientific name	Thalassaphorura tibiotarsalis
status	sp. nov.

Treatment

Thalassaphorura tibiotarsalis sp. nov.

Figs 1 View FIGURE 1 , 19 View FIGURES 14 – 19 , 25 View FIGURES 20 – 25 , 31 View FIGURES 26 – 31 & 37 View FIGURES 32 – 37 , Tab. 1 View TABLE 1 .

Type material. Holotype male, 2 paratypes male, 2 paratypes female and 2 paratype juveniles on slide, about 60 paratypes in alcohol. China: Guangxi: Fushui: Bapen Nature Reserve: 4.iii.2005, soil, berlese, L. Deharveng & A. Bedos leg. (CHIgx05–016); ibid: 4 paratypes on slide, about 50 paratypes in alcohol, 4.iii.2005, soil, berlese, L. Deharveng & A. Bedos leg. (CHIgx05–022); Guangxi: Longzhou: Nonggang Nature Reserve: 7.iii.2005: 6 paratypes on slide, about 50 paratypes in alcohol, soil, berlese, L. Deharveng & A. Bedos leg. (CHIgx05–067). Holotype and 8 paratypes on slide and many paratypes in alcohol in NJU; 4 paratypes on slide and many paratypes in alcohol in MNHN.

Description. Body length: females 0.6–0.7 mm, males 0.6 mm. Body shape: cylindrical, body sides parallel. Body color: white in alcohol.

Pseudocelli formula as 32/233/33343 dorsally, 11/000/01120 ventrally, subcoxa 1 of legs I, II and III with 2, 2 and 2 pso respectively ( Fig. 19 View FIGURES 14 – 19 ). Parapseudocelli: 1+1 on sternum of Abd. I, near base of ventral tube ( Fig. 37 View FIGURES 32 – 37 ). Pseudopore formula as 00/011/11110 dorsally, 00/111/000x0 ventrally.

S-chaeta formula as 11/011/222120 dorsally ( Fig. 19 View FIGURES 14 – 19 ). Sp present on head. S-microchaeta tiny and blunt, present on Th. II and III dorsally.

Head. Antennae short and distinctly segmented, as long as head. Length ratio of antennal segments I: II: III: IV = 1: 1.7: 1.7: 2. Ant. I with 9 chaetae. Ant. II with 13 chaetae. Ant. III sensory organ composed of 5 papillae, 5 guard chaetae, 2 small rods and 2 smooth subequal clubs; lateral ms just behind sensory organ. Ant. IV subapical organite with apex globular; basolateral ms at about 2/5 length from base. Antennal base without distinct granulation. PAO composed of 17–18 simple vesicles arranged in 2 rows along axis of organ. Dorsal cephalic chaeta d0 present. 3+3 p-chaetae between posterior a-pso on head present, p1 anterior to others. Mandible with 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 4/142. Labial papillae of ABC type, papillae A–E respectively with 1, 4, 0, 3 and 2 guard chaetae. Labium with 6 proximal, 4 (E, F, G and f) basomedian and 6 (a, b, c, d, e, e’) basolateral chaetae. Postlabial chaetae 4+4 along ventral groove.

Body chaetotaxy. Ordinary chaetae differentiated in meso- and macrochaetae, ratio Sp: m1: P1 on Abd. V = 1: 0.5: 1.6 ( Fig. 25 View FIGURES 20 – 25 ). Th. I with 5+5 dorsal chaetae. Th. II–Abd. III respectively with 3+3 dorsal chaetae along axial line, without dorsal axial chaetae. Abd. IV tergite with axial chaeta m0, Abd. V without axial chaetae, Abd. VI with axial chaeta a0 ( Fig. 25 View FIGURES 20 – 25 ). Th. I, II and III with 1+1, 1+1 and 1+1 chaetae respectively between legs. Subcoxa 1 of legs I, II and III with 3, 3 and 3 chaetae, subcoxa 2 with 1, 3 and 3 chaetae respectively.

Appendages. Tibiotarsi I, II and III with 16 (7, 8, 1), 16 (7, 8, 1) and 16 (7, 8, 1) chaetae. Unguis without teeth. Unguiculus slender and pointed, 0.5 times as long as inner edge of unguis, with narrow inner basal lamella ( Fig. 31 View FIGURES 26 – 31 ). Ventral tube with 6+6(7) distal chaetae and 2+2 basal chaetae, without anterior chaetae ( Fig. 37 View FIGURES 32 – 37 ). Furca reduced to a finely granulated area, with 4 small chaetae in two rows posterior to furcal rudiment.

Genital plate with 11 chaetae in females, 24 in males. Anal valves with numerous acuminate chaetae; each lateral valve with chaetae a0 and 2a1; upper valve with chaetae a0, 2a1, 2b1, c0, 2c1, 2c2. Anal spines set on indistinct papillae, as long as inner edge of hind unguis ( Fig. 25 View FIGURES 20 – 25 ).

Ecology. Only in deep soil layers.

Etymology. The name of the new species is derived from the number of chaetae on distal whorl of tibiotarsi.

Remarks. Bisexual species. The new species has the same formula of pso ventrally and dorsally as the following species: encarpata , lifouensis, qixiaensis , tenui s, tovtrensis and zschokkei . But it is easily separated from them by labial papillae of ABC type and presence of 7 chaetae in the distal whorl of tibiotarsi.