Species Account

Idas lamellosus Verrill, 1882

Mytiloidea : Mytilidae

Tebble name: n/a
Smith & Heppell name: n/a

To size: To 8 mm. Shell Structure: Fragile, translucent. Equivalve: Equivalve. Equilateral: Inequilateral, beaks close to the anterior margin. Tumidity: Moderate. Outline: Modioliform, narrow height to length ratio, posterior slightly expanded, posterior dorsal and ventral margins subparallel, posterior obliquely curved, anterior narrowly rounded.

Sculpture: Smooth with weak concentric growth lines, some with a few irregular radial corrugations over the median area. Margin: Inner margin smooth. Ligament: External, a thin band behind the beaks. Hinge: Hinge plate narrow, 10-12 crenulations below and in front of beaks; 15-20 crenulations behind the ligament with traces of crenulations beneath ligament. Pallial Musculature: Obscure. Periostracum: Thin, silky, tan in colour and drawn out into sparse, long, simple bristles over the posterior area. Colour: Shell white.

Distribution & Ecology

Found in sunken wood in the borings of shipworms from relatively deep water in both NE and NW Atlantic. From British waters there is only a single record from SW of the Wyville-Thomson Ridge.

Depth Range
Bathyal (500 - 2000m)

Additional Information & Related Species


Listed are literature citing Idas lamellosus Verrill, 1882. Reference containing the species Type Description is highlighted.

Oliver PG & Holmes AM 2009. Idas lamellosus Verrill, 1881 (Bivalvia: Mytiloidea) a woodfall mussel new to the fauna of the northeast Atlantic. Journal of Conchology. 39 (6): 705-708.
Verrill A E 1882. Catalogue of marine Mollusca added to the fauna of the New England region, during the past ten years. Transactions of the Connecticut Academy of Arts and Sciences. 5(2): 447-587 pl. 57-58.


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Record last modified: 22/03/2016