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7556-1.jpg (179971 bytes)



Fissidentalium horikoshii Okutani, 1982

Description: Shape large, slightly to moderately curved, fairly rapidly expanding. Weight solid. Aperture diameter up to 14 mm. Apex diameter 2.8 mm. Sculpture 1724 ribs at apex, increasing to 5080 ribs at aperture. Transverse sculpture absent. Aperture circular. Colour white.

Size: Up to 80 mm in length.

Distribution: Global distribution: Japan, eastern Australia. Within Australia, Cape York southwards to Bass Strait.

Habitat: Dredged in coarse sand in 16153500 m (Lamprell & Healy, 1998). Moderately common.

Comparison: This species has a rapidly expanding shell creating a relatively large aperture, with a large number of ribs at the aperture.

Fig. 1: East of Merimbula, NSW, in 33003500 m (C.174375).


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