Colinauropus chongzhoui, 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

Colinauropus chongzhoui sp. nov. Figures 4 , 5 , 6

Material examined.

Holotype, female adult with 9 pairs of legs (slide no. JS-WX-PA2018007), China, Jiangsu Province, Wuxi City, Daji Mountain, extracted from soil samples in bamboo forest, elev. 5 m, 31°32'N, 120°12'E, 8-X-2018, coll. Y. Bu. Non-type specimens, 1 juvenile with 8 pairs of legs (slides no. JS-WX-PA2017034), 2 juveniles with 6 pairs of legs (slides no. JS-WX-PA2018008, JS-WX-PA2018009), same data as holotype.

Diagnosis.

Colinauropus chongzhoui sp. nov. is characterized by the slender, annulate-striate setae on head, antennae and tergites; tergite I with 1 large sclerotized plate; tergite II with 6 small and 2 large 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 clavate; bothriotrichum T 3 brush-shaped, with branched pubescence distally.

Description.

Adult body length 0.97 mm (N = 1); body white-yellow in alcohol, sclerotized plates on tergites brown (Fig. 5A ).

Head (Figs 4A , 5C ). Dorsal setae short, cylindrical, annulate-striate, except seta a 3 of second row which is slender and tapering. Relative lengths of setae, 1st row: a 1 = 10, a 2 = 10; 2nd row: a 1 = 8, a 2 = 14, a 3 = 14; 3rd row: a 1 = 9, a 2 =10; 4th row: a 1 = 12, a 2 = 14, a 3 = 21, a 4 = 12; lateral group setae l 1 =23, l 2 = 21, l 3 = 19; the ratio a 1/ a 1- a 1 in 1st row 1.5, 2nd row 0.6, 3rd row 0.9 and 4th row 0.7. Temporal organs oval in dorsal view, their length 1.1 times as long as their shortest distance apart. Pistil present. Head cuticle with dense granules.

Antennae (Figs 4E , 5B ). Antennal segments 1-3 with 2, 2, 3 short, cylindrical, annulate setae respectively, and 1 rudimentary seta present on segment 3. Antennal segment 4 with 4 cylindrical setae and rudimentary seta u; relative lengths of setae: p = 10, p ' = 6, p' ’’ = 6, r = 6, u = 1; tergal seta p 1.1 times as long as tergal branch t; the latter cylindrical, 2.2 times as long as its greatest diameter and 0.9 of sternal branch s, which itself is 1.9 times as long as its greatest diameter. Seta q cylindrical, annulate, 1.3 times as long as s. Relative lengths of flagella (base segments included) and base segments: F 1 = 100, bs 1 = 10; F 2 = 52, bs 2 = 5; F 3 = 88, bs 3 = 9. F 1 6.4 times as long as t, F 2 and F 3 2.9 and 4.9 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 of the greatest diameter of t. Antennal cuticle densely granulated.

Trunk. Setae on collum segment cylindrical, annulate; sublateral setae length 23 μm, 2.1 times as long as submedian setae; sternite process triangular, furcate and granulated; appendages cylindrical and tapering (Fig. 5D ). Tergite I with 4+4 cylindrical setae (12-13 μm) and 1 large sclerotized plate (Fig. 5E ) (2 plates in juveniles, Fig. 5F ); Tergite II with 6+6 setae (12-23 μm), 6 small anterior and 2 large posterior sclerotized plates (Figs 4B , 5G ); Tergites III-V each with 6+6 setae (6-27 μm), 4 large and 4 small sclerotized plates (Fig. 5H-J ); Tergite VI with 4+2 setae and 2 large plates (Fig. 5K ), posterior setae 23 μm long, their mutual distance 18 μm (Fig. 5K ). Sclerotized plates with dense, brown granules, diameter 2-4 μm, and each granule with one short straight apical hair (Fig. 4B ). Other areas of cuticle on tergites with coarse granules.

Bothriotricha . Relative lengths: T 1 = 100, T 2 = 113, T 3 = 86, T 4 =118, T 5 = 167. T 1, T 2, T 4 and T 5 thin, long, with short erect or oblique pubescence on axis (Fig. 4C ). T 3 brush-shaped, with thicker axis and branched pubescence in distal 2/3 (Figs 4D , 6E ).

Legs. First and last pair of legs 5-segmented, others 6-segmented. Setae on coxa and trochanter of legs 1-8 cylindrical, annulate, length 13-15 μm and 16-20 μm respectively (Fig. 6D ). Setae on coxa of leg 9 cylindrical, annulate, length 12 μm (Fig. 6C ). Seta on trochanter of leg 9 furcate, with two subcylindrical, annulate, blunt branches, shorter one about 0.5 of longer one (Fig. 6C ). Tarsi 1-8 with short annulate distal seta (8 μm) only. Tarsus of leg 9 tapering, 40 μm in length, 3.6 times as long as its greatest diameter (Fig. 6B ), proximal seta slender, pointed, striate, 11 μm in length; distal one cylindrical, annulate, 9 μm in length, about 0.2 of the tarsal length. Cuticle of tarsus pubescent.

Pygidium. Tergum. Posterior margin blunt triangular. Relative lengths of setae: a 1 = 10, a 2 = 12, a 3 = 16, st = 5. Setae distinctly differentiated, a 1 cylindrical, pubescent; a 2 and a 3 slender, pubescent (Fig. 4F ); st short, clavate, pubescent (Figs 4G , 6A ). Distance a 1- a 1 0.7 of length of a 1; distance a 1- a 2 1.6 times as long as a 2- a 3; distance st - st 2.0 times as long as st and 1.5 times as long as distance a 1- a 1.

Sternum (Figs 4G , 6A ). Posterior margin with one lower indention between b 1. Relative lengths of setae (a 1 =10): b 1 = 28, b 2 =12. Seta b 1 cylindrical, thick, annulate; b 2 slender, short, pubescent. Distance b 1- b 1 0.8 of length of b 1; distance b 1- b 2 0.9 of b 2.

Anal plate linguiform, 1.7 times longer than broad; a pair of clavate appendage inserted posteriorly, 0.4 of the length of plate, and with short pubescence (Figs 4G , 6A ).

Etymology.

The species is dedicated to the honor of the late Professor Chongzhou Zhang (1930-2014) who was an eminent zoologist from Institute of Zoology, Chinese Academy of Sciences, for his great contribution to the knowledge of Myriapoda of China ( Stoev et al. 2014).

Distribution.

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

Remarks.

Colinauropus chongzhoui sp. nov. is similar to Colinauropus regis Remy, 1956 in the shape of anal plate. They can be easily distinguished by the number of sclerotized plates on tergite I (1 large plate in C. chongzhoui sp. nov. vs. 2 in C. regis ) and tergite II (8 in C. chongzhoui sp. nov., vs. 6 in C. regis ), shape of setae on tergites (slender and striate in C. chongzhoui sp. nov. vs. clavate and pubescent in C. regis ), and the shape of seta a 1 on pygidium (tapering in C. chongzhoui sp. nov. vs. clavate in C. regis ).

Figures

Figure 4. Colinauropus chongzhoui sp. nov. A head, dorsal view, right side B tergite II, right side C T 5 D T 3 E right antenna, tergal view F tergum of pygidium G sternum of pygidium and anal plate. Scale bars: 20 μm.

Figure 5. Colinauropus chongzhoui sp. nov. A habitus, tergal view B left antenna, sternal view C head, dorsal view D collum segment, sternal view E tergite I of adult F tergite I of juvenile G tergite II H tergite III I tergite IV J tergite V K tergite VI. Scale bars: 100 μm (A); 20 μm (B-K).

Figure 6. Colinauropus chongzhoui sp. nov. A sternum of pygidium and anal plate B tarsus of leg 9 C coxa and trochanter of leg 9 D coxa and trochanter of leg 1 E T 3. Scale bars: 20 μm.