Stenothyra glabra A. Adams, 1861

Qi, Lu, Xu, Biyang, Kong, Lingfeng & Li, Qi, 2023, Checklist of the micromolluscs in the intertidal zone of the Yellow Sea and Bohai Sea, China, Biodiversity Data Journal 11, pp. 105444-105444 : 105444

Stenothyra glabra A. Adams, 1861

Native status

Inhabiting the surface of mud flats or attaching to the under surface of floating leaves in freshwater estuaries.

Distribution

Yellow Sea and Bohai Sea of China, Korea and Japan.

Notes

The type locality of Stenothyra glabra A. Adams, 1861 is "estuary of the Pei-ho, North China", which is on the coast of the Bohai Sea. One of the localities in this study, Yellow River Estuary, is adjacent to the type locality. Moreover, the shells exhibit remarkable similarity in terms of size, shape, and microsculpture when compared to the descriptions provided by Adams (1861), Yen (1939), Yen (1942), and Kantor and Sysoev (2006), although the available photograph of the holotype is lacking ( Agatsuma et al. 2005). We believe that specimens collected in this study belong to common species from the coasts of the Yellow Sea and Bohai Sea in China and are conspecific with the type material.

Diagnosis

Shell minute (2.1 ± 0.14 mm in length, 1.5 ± 0.07 mm in width), ovate-conic, rather thick, dorso-ventrically compressed, with rounded to angled inflation of last whorl (Fig. 8 ). Up to 5 whorls including protoconch, with less convex whorls and sutures moderately deep. Surface smooth, yellowish-brown, sculpture not dotted lines, but continuous spiral grooves. The aperture abruptly descending, contracted and near circular; peristome continuous, showing a weak triangular area above; outer lip round with marked grooves. Operculum ovate, yellowish, translucent, with very weak angulation aligning with posterior apex of aperture; exterior surface with central paucispiral nucleus close to the inner lip. Protoconch dome-shaped, smooth, 1-3/4-2 whorls; some pits in the first whorl.

Figures

Figure 8. Stenothyra glabra A. Adams, 1861.