Alvania concinna 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

Alvania concinna A. Adams, 1861

Native status

Lives in intertidal areas in sheltered bays on seaweed.

Distribution

China, Japan and Korea.

Notes

The trait of the genus Alvania Risso, 1826 is that the teleoconch is ovate-conic to elongate-conic, with clathrate sculpture or spiral sculpture ( Adams 1850). The changes of morphological characteristics and surface colour are relatively large, the synonym Hydrobia plicosa E. A. Smith, 1875 is a northern form of this species ( Okutani 2017).

Diagnosis

Shell minute (4.5 ± 0.41 mm in length, 2.4 ± 0.11 mm in width), elongate conical (Fig. 10 ). Whorls about 6, slightly convex, with elevated spire, deeply sutured. Shell surface reddish-brown, sculptured with many spiral ribs and strong axial ribs; axials tend to weaken on body whorls in populations in temperate waters. Aperture simple, ovate, outer lip thin, without varix, the upper part of outer lip slightly angular. Apex generally not strongly tilted in species with paucispiral protoconch. No umbilicus.

Figures

Figure 10. Alvania concinna A. Adams, 1861.