Brachystomia bipyramidata Nomura, 1936

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

Brachystomia bipyramidata Nomura, 1936

Native status

Sucking body fluid of Crassostrea gigas on rocks in intertidal zones.

Distribution

North of China, Japan.

Notes

The genus Brachystomia Monterosato, 1884 is very similar to Odostomia spp. in shell characters, but differs in the protoconch turning down on the teleoconch apex, attaching to other molluscs when alive ( Okutani 2017).

Diagnosis

Shell minute (3.2 ± 0.27 mm in height, 1.5 ± 0.34 mm in width), oval conical, moderately thick, translucently milky-white, solid (Fig. 15 ). Whorls about 5, each spiral slightly convex, the height of the body whorl is larger than spire. Surface covered with yellowish-brown periostracum. Suture distinct, grooved. Growth lines coarse and flexuous. Aperture ovate. Columella with a weak fold. Outer lip margin with a shallow posterior sinus.

Figures

Figure 15. Brachystomia bipyramidata (Nomura, 1936).