Pirenella incisa ( Hombron & Jacquinot, 1848 )

Zvonareva, Sofya & Kantor, Yuri, 2016, Cheсklist of gastropod molluscs in mangroves of Khanh Hoa province, Vietnam, Zootaxa 4162 (3), pp. 401-437 : 415

Pirenella incisa ( Hombron & Jacquinot, 1848)

Figs 5A –D

Cerithium incisum Hombron & Jacquinot, 1848: 97 , pl. 23, figs 8–9.

Cerithideopsilla djadjariensis (K. Martin, 1899) : Lozouet & Plaziat 2008: 110 –111, pl. 19, figs 5–7; Poppe 2008a: 284 –287, pl. 87, fig. 2, pl. 88, fig. 2; Zvonareva et al. 2015: 8.

Cerithidea (Cerithideopsilla) djadjariensis: Okutani 2000: 132 –133, pl. 66, fig. 5.

Cerithideopsilla incisa A: Ozawa et al. 2015: fig. 2.

Pirenella incisa: Reid & Ozawa 2016: 30 –35, figs 1, 2G, H, 4I, 10, 11A (full synonymy).

Material examined. Nha Phu Bay, about 10 specimens.

Abundance. Uncommon.

Measurements. Up to 50 mm ( Okutani 2000).

Ecological notes. Development with planktonic phase of 10–12 days.

On intertidal mudflats from mid to low tide level, and beneath mangrove trees in non-drying puddles, in seaward estuarine mangroves. Often co-occurs with Pirenella cingulata ( Reid & Ozawa 2016) .

In studied sites it was found on mud under mangrove trees.

Relation to mangroves. Predominantly mangrove-associated.

Distribution in Vietnam. From northern-east coast to central Vietnam ( Reid & Ozawa 2016).

General distribution. Vietnam, Malayan archipelago and Philippines ( Reid & Ozawa 2016).

Remarks. The current molecular analysis of world fauna of Cerithideopsilla demonstrated much higher species diversity than was anticipated previously ( Ozawa et al. 2015). In particular three entities were recognized within former ‘ Cerithideopsilla djadjariensis’, of which one, P. i n c i s a is found in Central Vietnam . This species also extends to Malaysia and Philippines ( Reid & Ozawa 2016).

Figures

FIGURE 5. A – B. Pirenella incisa (22 mm). C – D. Pirenella incisa (25 mm). E – F. Pirenella microptera (22 mm). G – H. Pirenella cingulata (22 mm). I – J. Pirenella cingulata (16 mm). K – L. Cerithidea moerchii (31 mm). M – N. Cerithidea moerchii (27 mm). O. Cerithidea quoyii (43 mm). P. Cerithidea quoyii (41 mm). Q – R. Cerithidea quoyii (35 mm). S – T. Terebralia sulcata (43 mm).