Thalassaphorura tibiotarsalis Sun, Chen & Deharveng, 2010, sp. nov.
Creators: name: Sun, Xin
name: Chen, Jian-Xiu
name: Deharveng, Louis
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Entognatha
Collembola
Onychiuridae
Thalassaphorura
Thalassaphorura tibiotarsalis

description: Thalassaphorura tibiotarsalis sp. nov.
Figs 1, 19, 25, 31 & 37, Tab. 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). Parapseudocelli: 1+1 on sternum of Abd. I, near base of ventral tube (Fig. 37). Pseudopore formula as 00/011/11110 dorsally, 00/111/000x0 ventrally.
S-chaeta formula as 11/011/222120 dorsally (Fig. 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). 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). 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). Ventral tube with 6+6(7) distal chaetae and 2+2 basal chaetae, without anterior chaetae (Fig. 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).
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.
description: Published as part of 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, pp. 20-38 in Zootaxa 2627 on pages 35-36, DOI: 10.5281/zenodo.198236