Pseudostrandesia calapanensis ( Tressler, 1937 )

Ma, Shunxin & Yu, Na, 2020, Freshwater ostracods (Crustacea) from Hainan Island, southern China, with description of a new species, Zootaxa 4767 (2), pp. 201-243 : 216-217

Pseudostrandesia calapanensis ( Tressler, 1937)

Figures 9 and 10C .

1937 Strandesia calapanensis nov. spec. — Tressler: 197 –198, figs. 33–35.

1938a Strandesia uenoi n. sp. — Klie: 30 –33, figs. 12–15.

2009 Pseudostrandesia calapanensis — Savatenalinton & Martens: 19.

Material examined: Two females and five female valves from JFL16, two females ( ECNU 20170413/HN33–34) dissected; eleven females and nine female valves from 11JFL16.

Dimensions: Female, LV, n = 2, length 0.654 –0.659 mm, height 0.311 –0.317 mm; RV, n = 1, length 0.651 mm, height 0.311 mm.

Description: In lateral view, carapace elongated, with greatest height anterior of mid-length. Surface of cara-

pace slightly pitted. Dorsal margin slightly arched. Ventral margin slightly concave. Anterior margin more rounded than posterior ( Fig. 9A ). LV with inner groove along valve margins except dorsal margin ( Fig. 9B ). In dorsal view, LV overlapping RV. Rome organ on A1 long. Seta d on L5 absent. Seta d1 longer than seta d2 on L6. Triebel’s loop situated between dorsal and ventral branches of UR attachment ( Fig. 10C ).

Distribution: This species has previously been found in Thailand ( Savatenalinton & Martens 2010), the Philippines ( Tressler 1937; Victor & Fernando 1981c), and the Chinese provinces (reported as Strandesia uenoi ) from Hubei and Taiwan ( Chen 1982), Jiangsu ( Yu et al. 2005), Jiangxi ( Zhang et al. 1994), Sichuan ( Huang 1986) and Taiwan ( Klie 1938a). This species was found in Jianfengling National Forest Park on Hainan Island.

Remarks: Following the generic revision of subfamily Cypricercinae by Savatenalinton & Martens (2009), this species can be identified by the presence of a groove and one inner list, the long Rome organ, the absence of the d seta on L5, the longer d1 seta on L6 and the mid-position of the Triebel’s loop on UR attachment ( Fig. 10C ). Specimens from Hainan (length 0.651 –0.659 mm) are smaller than specimens found at other locations (length of Thai specimens is 0.806 –0.822 mm; length of the Taihu Lake specimens is 0.800 – 0.830 mm.) ( Savatenalinton & Martens 2010; Yu et al. 2005). Specimens found at Hainan are more similar to specimens from the Philippines (carapace with pitted surface) than Thai specimens (carapace smooth) ( Victor & Fernando 1981c; Savatenalinton & Martens 2010).

Figures

FIGURE 9. Pseudostrandesia calapanensis (Tressler, 1937). Female. ECNU20170413/HN33. A, external view of RV; B, internal view of LV. Scale bar: 100 μm.

FIGURE 10. A–B, Pseudostrandesia mamarilorum (Victor & Fernando, 1981c). Female. ECNU20170417/HN35. A, L6; B, UR attachment. C, Pseudostrandesia calapanensis (Tressler, 1937). ECNU20170413/HN33, female, UR attachment. Scale bars: 100 μm.