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).