Thalassaphorura xihuensis, Sun, Xin & Li, Yu, 2015
|
publication ID |
https://doi.org/ 10.11646/zootaxa.3931.2.5 |
|
publication LSID |
lsid:zoobank.org:pub:A61B92F6-8D88-4C29-BCCB-783E73D0A8DC |
|
DOI |
https://doi.org/10.5281/zenodo.6100568 |
|
persistent identifier |
https://treatment.plazi.org/id/03B487AE-1B59-093E-B3B4-FD72ADD9FD74 |
|
treatment provided by |
Plazi |
|
scientific name |
Thalassaphorura xihuensis |
| status |
sp. nov. |
Thalassaphorura xihuensis sp. nov.
Figs 12–24 View FIGURE 12 – 18 View FIGURE 19 – 24
Type material. Holotype female, China, Zhejiang Province, Hangzhou City, Xihu Park (30˚15’44” N, 120˚08’41” E), 0 6 December 2014, litter and soil in the broadleaved forest, Berlese extraction, Sun Xin leg. Paratypes 11 females and 3 males, same data as holotype.
Description. Body white in alcohol. Length of body 0.80–1.05 mm in females, 0.72–0.75 mm in males; holotype 0.9 mm. Shape of body: cylindrical with anal spines on papillae. Anal spines 0.7 times as long as inner edge of hind unguis.
Pso formulae 32/233/33343 dorsally and 11/000/01120 ventrally ( Figs 12, 18 View FIGURE 12 – 18 , 22 View FIGURE 19 – 24 ). Subcoxae 1 of legs I–III with 2 pso each. Psx formulae 00/000/110000 ventrally ( Figs 12, 18 View FIGURE 12 – 18 , 22 View FIGURE 19 – 24 ). Subcoxae 1 of legs I–III without psx. Psp formulae 00/011/ 111100 dorsally and 00/111/0001m0 0 ventrally ( Figs 12, 18 View FIGURE 12 – 18 , 22 View FIGURE 19 – 24 ).
Head. Antennae as long as head. Length ratio of Ant. I: II: III: IV as about 1: 1.5: 1.5: 2.0 ( Fig. 15 View FIGURE 12 – 18 ). Subapical organite on Ant. IV with globular apex; basolateral ms at about 1/4 length from the base, above the first proximal row of chaetae ( Fig. 15 View FIGURE 12 – 18 ). Ant. III sensory organ consists of 4 papillae, 5 guard chaetae, 2 small rods, and 2 smooth sensory clubs; lateral ms just behind sensory organ ( Figs 14, 15 View FIGURE 12 – 18 ). Ant. II with 13 chaetae. Ant. I with 8 chaetae. Antennal base not clearly marked. PAO with 20–24 simple vesicles arranged in two rows along axis of organ ( Fig. 17 View FIGURE 12 – 18 ). Dorsal cephalic chaeta d0 present. On head 3+3 medial p-chaetae present between posterior pso, p1 and p3 anterior to p2 ( Fig. 21 View FIGURE 19 – 24 ). Mandible with strong molar plate and 4 apical teeth. Maxilla bearing 3 teeth and 6 lamellae. Maxillary palp simple with 1 basal chaeta, with 2 sublobal hairs. Labral chaetae 4/142. Labium with 6 proximal, 4 basomedian (E, F, G, and f) and 6 basolateral (a, b, c, d, e, e’) chaetae ( Fig. 13 View FIGURE 12 – 18 ); labial type AC, papillae A–E with 1, 4, 0, 3 and 2 guard chaetae respectively ( Fig. 13 View FIGURE 12 – 18 ). Postlabial chaetae 4+4 along ventral groove ( Fig. 22 View FIGURE 19 – 24 ).
Body chaetotaxy. S-chaetae well differentiated, formulae as 11/011/222120 dorsally, 11/000/000100 ventrally ( Figs 12 View FIGURE 12 – 18 , 22 View FIGURE 19 – 24 ). Tiny and blunt ms present on both Th. II and III ( Figs 12 View FIGURE 12 – 18 , 19 View FIGURE 19 – 24 ). Th. I tergum with 6+6 chaetae. Th. II–Abd. III terga with 3+3 chaetae along axial line, without unpaired axial chaetae ( Fig. 12 View FIGURE 12 – 18 ). Abd. IV tergum with one axial chaeta m0, Abd. V tergum often with one axial chaeta a0, Abd. VI tergum with two axial chaetae a0 & m0 ( Figs 12 View FIGURE 12 – 18 , 20 View FIGURE 19 – 24 ). Th. I–III sterna with 1+1, 1+1, 1+1 chaetae respectively.
Appendages. Subcoxae 1 of legs I–III with 4 chaetae each, subcoxae 2 with 1, 4 and 4 chaetae respectively. All tibiotarsi with 18 (1, 8, 9) chaetae ( Fig. 16 View FIGURE 12 – 18 ). Unguis without teeth. Unguiculus 0.7 times as long as inner edge of unguis, without inner basal lamella ( Fig. 16 View FIGURE 12 – 18 ). Ventral tube with 1+1 anterior chaetae, 6+6 distal chaetae and 2+2 basal chaetae. Furca reduced to finely granulated area, with 4 small dental chaetae arranged in two rows posteriorly and one manubrial row of chaetae ( Figs 18 View FIGURE 12 – 18 , 23 View FIGURE 19 – 24 ).
Genital plate with 12–15 chaetae in females, 28–30 in males. Male ventral organ absent. Anal valves with numerous acuminate chaetae; each lateral valve with chaetae a0, 2a1 and 2a2; upper valve with chaetae a0, 2b1, 2b2, c0, 2c1 and 2c2 ( Fig. 24 View FIGURE 19 – 24 ).
Ecology. In broadleaved litter and soil, in an urban recreational park.
Derivatio nominis. Named after the type locality.
Discussion. T. xihuensis sp. nov. belongs to the small group of congeners characterized by the presence of only 4 papillae in AIIIO. Up to now, four such species are known: T. butrosi ( Christiansen, 1956) , T. franzi (Stach, 1946) , T. cryptopyga ( Denis, 1931) , and T. tovtrensis (Kaprus’ & Weiner, 1994). T. xihuensis sp. nov. can be separated from T. butrosi and T. franzi by the dorsal pso formula (32/233/ 33343 in the new species, 32/122/ 22(1)3(2)3(2)2 T. butrosi ). T. xihuensis sp. nov. differs from T. cryptopyga by the ventral pso formula (11/000/ 0 1120 in the new species, 11/000/01000 in T. cryptopyga ), anterior chaetae on the ventral tube (1+ 1 in the new species, absent in T. cryptopyga ), and the presence of AS (absent in T. cryptopyga ). T. tovtrensis is most similar to the new species having the same pso formulae (32/233/33343 dorsally and 11/000/01120 ventrally), 2 pso on subcoxae 1 of all legs, 1+1 chaetae on each thoracic sternum, ventral tube with 1+1/6+6/2+2 chaetae and 9 distal chaetae on tibiotarsi. Nevertheless the new species can be easily distinguished due to longer AS (two spiniformed chaetae present in T. tovtrensis instead of true AS, more vesicles in PAO (20–24 versus 10–13 in T. tovtrensis ), and 5 guard chaetae in AIIIO (versus 4 in T. tovtrensis ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.