Colinauropus chinensis, Bu, 2020

Bu, Yun, 2020, First record of the family Colinauropodidae (Myriapoda, Pauropoda) in China, with the description of three new species, ZooKeys 947, pp. 53-70: 53

publication ID

http://dx.doi.org/10.3897/zookeys.947.53723

publication LSID

lsid:zoobank.org:pub:7E8524DC-A5E1-4F8A-BE1F-089CDFFEE7F8

persistent identifier

http://treatment.plazi.org/id/DFA53888-8023-4745-B84C-82E51BCB5E57

taxon LSID

lsid:zoobank.org:act:DFA53888-8023-4745-B84C-82E51BCB5E57

treatment provided by

ZooKeys by Pensoft

scientific name

Colinauropus chinensis
status

sp. nov.

Colinauropus chinensis   sp. nov. Figures 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3

Material examined.

Holotype, female adult with 9 pairs of legs (slide no. JS-WX-PA2017033), China, Jiangsu Province, Wuxi City, Daji Mountain, extracted from soil samples in bamboo forest, elev. 5 m, 31°32'N, 120°12'E, 9-X-2017, coll. Y. Bu. Paratypes, 2 female adults with 9 pairs of legs (slides no. JS-WX-PA2017031, JS-WX-PA2017032), same data as holotype; 1 female adult with 9 pairs of legs (slide no. JS-WX-PA2018006), same locality as holotype, 9-X-2018, coll. Y. Bu.

Diagnosis.

Colinauropus chinensis   sp. nov. is characterized by the cylindrical, annulate setae on head, antennae and tergites; tergite I without distinct sclerotized plates; tergite II with 2 large and 4 small sclerotized plates; tergites III-V each with 4 large and 4 small plates; tergite VI with 2 large plates; seta st on tergum of pygidium cylindrical; bothriotrichum T 3 with thicker axis and dense tufted pubescence distally.

Description.

Adult body length (0.88-) 0.96 (-0.98) mm (N = 4); body white-yellow in alcohol, sclerotized plates on tergites brown (Fig. 2A View Figure 2 ).

Head (Figs 1A View Figure 1 , 2D View Figure 2 ). Dorsal setae cylindrical, annulate, first and second rows shorter than posterior rows. Relative lengths of setae, 1st row: a 1 = 10, a 2 = 8 (-9); 2nd row: a 1 = 13 (-14), a 2 = 7 (-9), a 3 = 7; 3rd row: a 1 = (18-) 20, a 2 = (23-) 24; 4th row: a 1 = 16 (-17), a 2 = 16 (-17), a 3 = 22 (-25), a 4 = 14 (-16); lateral group setae l 1 =21 (-26), l 2 = 26 (-31), l 3 = 29 (-35); the ratio a 1/ a 1- a 1 in 1st row 0.7 (-0.9), 2nd row 0.5, 3rd row1.2 and 4th row 0.7 (-0.8). Temporal organs oval in dorsal view, their length 0.8 of their shortest distance apart. Pistil present. Head cuticle faintly granular.

Antennae (Figs 1E View Figure 1 , 2B, C View Figure 2 ). Antennal segments 1-3 with 2, 2, 3 short, cylindrical, annulate setae respectively, and 1 rudimentary setae present on segment 3. Antennal segment 4 with 4 cylindrical setae; relative lengths of setae: p = 10, p ' = 6, p' ’’ = 5, r = 5; tergal seta p (1.3-) 1.4 times as long as tergal branch t; the latter cylindrical, 1.7 (-1.8) times as long as its greatest diameter and 0.8 of sternal branch s, which itself is 1.6 times as long as its greatest diameter. Seta q cylindrical, annulate, 0.9 of s. Relative lengths of flagella (base segments included) and base segments: F 1 = 100, bs 1 = 8 (-11); F 2= (41-) 49, bs 2 = (5-) 6; F 3 = (84-) 92, bs 3 = 9 (-10). F 1 (6.6-) 7.2 times as long as t, F 2 and F 3 (2.3-) 2.7 and (4.8-) 5.1 times as long as s respectively. Distal calyces spherical; apex of flagella fusiform, with a short lateral flap. Globulus g 1.7 times as long as wide; about 12 bracts, capsule spherical; width of g (0.5-) 0.6 of the greatest diameter of t. Antennal cuticle granulated.

Trunk. Setae on collum segment cylindrical, annulate; sublateral setae length (20-) 22 μm, (1.9-) 2.0 times as long as submedian setae; sternite process triangular, furcate and granulated; appendages barrel shaped (Fig. 2E View Figure 2 ). Tergite I with 4+4 short, cylindrical setae (14-15 μm), posteriorly with two patches of thickened cuticles but not form distinct sclerotized plates (Fig. 2F View Figure 2 ); Tergite II with 6+6 setae (9-20 μm), 4 small anterior and 2 large posterior sclerotized plates (Figs 1B View Figure 1 , 2G View Figure 2 ); Tergites III-V each with 6+6 setae (9-21 μm), 4 large and 4 small sclerotized plates (Fig. 2H-J View Figure 2 ); Tergite VI with 4+2 setae and 2 large plates (Fig. 2K View Figure 2 ), posterior setae 10 (-11) μm long, their mutual distance 20 (-23) μm (Fig. 2K View Figure 2 ). Sclerotized plates with dense, brown granules, diameter 1.5-3.2 μm (Fig. 1B View Figure 1 ). Other areas of cuticle on tergites with pale and fine granules.

Bothriotricha   . Relative lengths: T 1 = 100, T 2 = (110-) 117, T 3 = (122-) 128, T 4 =133(-140), T 5 = (167-) 178. T 1, T 2, T 4 and T 5 long, with short erect and oblique pubescence on axis (Fig. 1C View Figure 1 ). T 3 with thicker axis and dense tufted pubescence distally (Fig. 1D View Figure 1 ).

Legs. First and last pair of legs 5-segmented, others 6-segmented (Fig. 3A-C View Figure 3 ). Setae on coxa and trochanter of legs 1-8 cylindrical, annulate (Fig. 3A, C View Figure 3 ), length 13 (-14) μm and 18 (-20) μm respectively. Setae on coxa of leg 9 cylindrical, annulate, length (15-) 17 μm (Fig. 3B, D View Figure 3 ). Setae on trochanter of leg 9 furcate, with subcylindrical, annulate, blunt branches, shorter one about (0.6-) 0.7 of longer one (Fig. 3B, D View Figure 3 ). Tarsi 1-8 with short, annulate distal seta (6 μm) only (Fig. 3A, C View Figure 3 ). Tarsus of leg 9 tapering, 35 μm in length, 3.2 (-3.5) times as long as its greatest diameter (Fig. 3B View Figure 3 ), proximal seta slender, pointed, striate, 10 (-13) μm in length; distal seta cylindrical, annulate, 6 (-7) μm in length, about 0.2 of the tarsal length. Cuticle of tarsus pubescent.

Pygidium. Tergum. Posterior margin waved. Relative lengths of setae: a 1 = 10, a 2 = 13, a 3 = 15, st = 10 (-12). Setae distinctly differentiated, a 1 short, clavate, pubescent; a 2 and a 3 slender and pubescent (Figs 1F View Figure 1 , 2K View Figure 2 ); st thick and pubescent (Figs 1G View Figure 1 , 2K View Figure 2 ). Distance a 1- a 1 as same long as a 1; distance a 1- a 2 2.0 (-2.5) times as long as a 2- a 3; distance st - st (1.5-) 1.6 times as long as st and 1.6 (-1.8) times as long as distance a 1- a 1.

Sternum (Figs 1G View Figure 1 , 2L View Figure 2 ). Posterior margin with a deep indention between b 1. Relative lengths of setae (a 1 =10): b 1 = 33(-35), b 2 =13 (-15). Seta b 1 cylindrical, thick and annulate; b 2 slender and short, pubescent. Distance b 1- b 1 (0.7-) 0.8 of length of b 1; distance b 1- b 2 (0.7-) 0.9 of b 2.

Anal plate linguiform, glabrous, 2.0 times longer than broad, lateral margins concave in anterior part, posterior margin with three small lobes; two pairs of appendages present: inner one tiny and conical; outer one cylindrical and longer, (0.4-) 0.5 of the length of plate and with short pubescence (Figs 1G View Figure 1 , 2L View Figure 2 ).

Etymology.

The species is named after China where the type specimens were collected.

Distribution.

China (Jiangsu). Only known from the type locality.

Remarks.

Colinauropus chinensis   sp. nov. is most similar to C. haginoi   Scheller, 2009 from Philippines in the similar shape of the anal plate and absence of sclerotized plates on tergite I. They can be easily distinguished by the number of sclerotized plates on tergites II and VI (6 and 2 in C. chinensis   sp. nov., vs. 8 and 4 in C. haginoi   ), length of setae on collum segment (sublateral setae 1.9-2.0 times as long as submedian setae in C. chinensis   sp. nov. vs. 3.2 times in C. haginoi   ), and the shape of T 3 (subcylindrical, not clavate in C. chinensis   sp. nov. vs. proximal half distinctly clavate in C. haginoi   ).