Philodina chinensis Wang & Örstan, 2025

Philodina chinensis Wang & Örstan sp. nov.

Material examined.

Holotype: China • one female on permanent slide; Sichuan province, Chengdu city, Chengdu zoo ; 30.7104 ° N, 104.1063 ° E; 505 m a. s. l.; collected on 6 Jul. 2019; W. B. Wang leg.; collected from leaf litter; SYSBM Ro-20221229-01 GoogleMaps . Paratypes: • two females on permanent slides; same data as for holotype; SYSBM Ro-20221229-02 and SYSBM Ro-20221229-03 GoogleMaps . All deposited in the Museum of Biology, Sun Yatsen University, Guangzhou, China.

Differential diagnosis.

Dorsal posterior border of anal pseudosegment with wavy transverse ridge of multiple knobs; posterior border of pre-anal pseudosegment with V-shaped notch.

Description.

Body of medium size. Rostrum of moderate length; lamella with two tiny lobes. Trochal discs wider than head but not exceeding widest part of trunk when feeding. CW 113.6–125.6 % of HW, HL 15.4–17.4 % of TL. Upper lip medium height, with two distinctively separated wide lobes. Sulcus wide, without ligula . Neck stout, moderately long. Antenna long, approximately 1 / 2 of bearing pseudosegment width. Trunk stout; integument of trunk rough, sticky, with bark-like longitudinal ridges, covered with small papilla; BW 21.8–25.7 % of TL. V-shaped notch on posterior border of pre-anal pseudosegment. Wavy transverse ridge consisting of multiple knobs on posterior border of the anal pseudosegment, no knobs on ventral side. RL / TL 6.3–9.3 %, RW / RL 117.4–153.3 %. Foot short, of four pseudosegments; FL 3.8–6.9 % of TL; FW 100–200 % of FL. Spurs of moderate length, peg-shaped, divergent; interspace width slightly wider than spur width; SL 142.9–250 % of SSW. Four thick toes. No eyespots. Trophi, 10–16 μm long and 6–11 μm wide; dental formula 2 + 1 / 1 + 2. Egg oval and surface smooth, with protrusion on one side (Fig. 4 View Figure 4 ).

Comparison with other species.

Similar to subspecies P. rugosa coriacea Bryce, 1903 in the prominent ridges of the skin-folds of the trunk and shagreened integument. However, P. rugosa coriacea has a straight transverse ridge on the first foot pseudosegment ( Bryce 1903; Song and Kim 2000); in comparison, the transverse ridge in P. chinensis sp. nov. consists of knobs. In addition, P. rugosa has eyespots ( Bryce 1903; Song and Kim 2000) that are absent in P. chinensis sp. nov. The dental formula of P. rugosa is 3 / 3 ( Bryce 1903), but that of P. chinensis sp. nov. is 2 + 1 / 1 + 2.

Measurements.

See Table 2 View Table 2 . The proportion data of morphological parameters in the description were obtained from the Sichuan specimens of P. chinensis .

Distribution.

The new species is widely distributed in southern China. Seven specimens were documented in Chengdu city, Sichuan province. Thirteen specimens were documented in Guiyang city, Guizhou province. Thirteen specimens were documented in Lasa city, Tibet province.

Etymology.

The new species is named after the country of China, where it is widely distributed.