Thalassaphorura tiani 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 tiani

description: Thalassaphorura tiani sp. nov.
Figs 1, 18, 24, 30 & 36, Tab. 1.
Type material. Holotype female, 1 paratype female, 3 paratype male and 3 paratype juvenile. China: Guangxi Province: Fushui: Bapen Nature Reserve: 4.iii.2005, soil, berlese, L. Deharveng & A. Bedos leg. (CHIgx05– 028). Holotype and 3 paratypes on slide in NJU, 4 paratypes on slide in MNHN.
Description. Body length: females 1.1 mm, males 0.8–0.92 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. 18). Parapseudocelli: Parapseudocelli: 1+1 on sternum of Abd. I, near base of ventral tube (Fig. 36). Pseudopore formula as 00/011/11110 dorsally, 00/111/000x0 ventrally.
S-chaeta formula as 11/011/222120 dorsally (Fig. 18). Sp present on head. S-microchaeta tiny and blunt, present on Th. II and III dorsally.
Head. Antennae short and distinctly segmented, 0.8 times as long as head. Length ratio of antennal segments I: II: III: IV = 1: 2: 1.5: 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 24–26 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. 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 AC 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 macro-chaetae, ratio Sp: m1: P1 on Abd. V = 1: 0.7: 2 (Fig. 24). Th. II–Abd. III respectively with 3+3 dorsal chaetae along axial line, without dorsal median chaetae. Abd. IV tergite with axial chaeta m0, Abd. V with axial chaeta a0, Abd. VI with axial chaeta a0 and m0 (Fig. 24). 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 4, 4 and 4 chaetae, subcoxa 2 with 1, 4 and 4 chaetae respectively.
Appendages. Tibiotarsi I, II and III with 18 (9, 8, 1), 18 (9, 8, 1) and 18 (9, 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. 30). Ventral tube with 1+1anterior chaetae, 6+6 distal chaetae and 2+2 basal chaetae (Fig. 36). Furca reduced to a finely granulated area, with 4 small chaetae in two rows posterior to furcal rudiment.
Genital plate with 12 chaetae in females, 29 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 distinct papillae, as long as inner edge of hind unguis (Fig. 24).
Ecology. In forest soil.
Etymology. Named in honor of Prof. Tian Mingyi, for its outstanding contribution to cave biodiversity survey in the project.
Remarks. Bisexual species. T. tiani sp. nov. is similar to lifouensis, petaloides and zschokkei (see key). It differs from lifouensis in number of chaetae between posterior pso on head (4+ 4 in lifouensis versus 3+ 3 in tiani sp. nov.), length of AS (AS equals 0.5 unguis in lifouensis versus AS as long as unguis in tiani sp. nov.), chaetae on ventral tube (8+ 8 in lifouensis versus 9+ 9 in tiani sp. nov.) and dorsal S-chaeta shape (not differentiated in lifouensis versus very differentiated in tiani sp. nov.). It differs from petaloides in dorsal Schaeta formula (10/011/ 221121 in petaloides versus 11/011/ 222120 in tiani sp. nov.), length of unguiculus (very small in petaloides versus 0.5 times as long as unguis in tiani sp. nov.) and distal whorl of tibiotarsi (7 in petaloides versus 9 in tiani sp. nov.). It differs from zschokkei in dorsal S-chaeta shape (not differentiated in zschokkei versus very differentiated in tiani sp. nov.), length of unguiculus (0.75 times as long as unguis in zschokkei versus 0.5 times as long as unguis in tiani sp. nov.) and axial chaeta dorsally on Abd. VI (one in zschokkei versus two in tiani sp. nov.).
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 34-35, DOI: 10.5281/zenodo.198236