Colurella sanoamuangae Chittapun, Pholpunthin & Segers, 1999

Wei, Nan, Jersabek, Christian D., Xu, Runlin & Yang, Yufeng, 2019, New species and records of Colurella (Rotifera: Lepadellidae) from South China, with a key to Chinese Colurella, Zootaxa 4586 (3), pp. 475-490 : 486-488

Colurella sanoamuangae Chittapun, Pholpunthin & Segers, 1999

( Fig. 10 )

This species was to date only recorded from the Oriental region, in Thale Noi Lake on Malay Peninsula of Thailand ( Segers & Pholpunthin, 1997), in coastal peat swamps in the Phuket Province of Thailand ( Chittapun et al., 1999; 2007; Segers & Chittapun 2001) and from Northeast India ( Sharma & Sharma, 2005; 2014). We found it at three sites on Qi’ao Island ( Tab. 1 ) in low number and at two sites in the Nandujiang River Estuary, Haikou, Hainan Province (sampled biannually, Tab. 1 ).

Colurella sanoamuangae is characterized by the posterior end of the lorica forming a triangular projection (lateral view), that overlays the foot aperture as a tongue-shaped structure (ventral/dorsal view) ( Chittapun et al., 1999). This seems to be a stable morphological feature, as far as can be judged from previous observations. Accordingly, a previous record under this name from Iran, with posteriorly rounded lorica ( Reihan Reshteh & Rahimian, 2014), probably represents another as yet undescribed species ( Jersabek & Leitner, 2013). According to our present knowledge, C. sanoamuangae is an endemic species widely distributed in the Oriental region.

Measurements. Body (N = 5 females): lorica length 97.8–101.4 µm, lorica width 46.7–48.5 µm, lorica height 59.4–67.2 µm, anterior aperture width 45.8–48.2 µm, second foot pseudosegment 6.7–8.1 µm, third foot pseudosegment 7.9–10.1 µm, toe length 46.6–47.5 µm.

Figures

FIGURE 10. Colurella sanoamuangae Chittapun, Pholpunthin & Segers, 1999. A, C. Right lateral view. B. Ventral view. Scale bars: A–B: 50 µm.