Species Account

Parvicardium exiguum var subangulatum (Scacchi, 1833)

Cardioidea : Cardiidae

Tebble name: Parvicardium exiguum (Gmelin)
Smith & Heppell name: Parvicardium exiguum (Gmelin, 1791)

To size: To 10mm. Shell Structure: Thin but robust. Equivalve: Equivalve. Equilateral: Inequilateral, beaks distinctly in front of the midline. Tumidity: Moderate. Outline: Sub quadrate; anterior dorsal margin very short sloping and a little excavated; posterior dorsal margin short. Posterior margin long, almost straight; ventral margin gently curved, anterior roundly angled. Contour: Posterior angle distinct, posterior area broad and flattened. Lunule oval, smooth.

Sculpture: As typical form but largely lacking any nodules or spines on ribs. Margin: Crenulated by interlocking ribs and interspaces. Furrows extending into the umbonal cavity in most specimens. Ligament: Prominent, on short nymph. Hinge: Weak, RV with 2 anterior laterals, 1 posterior lateral, 2 cardinals. LV with single anterior and posterior laterals and 2 cardinals. Pallial Musculature: Obscure. Periostracum: Persistent often as a fringe on the ribs. Colour: Mostly coloured mottled, tan, greenish brown, darker brown.

Distribution & Ecology

A form known from the Baltic and Loch Sween in Scotland. Inhabiting Zostera beds in very sheltered sites.

Depth Range
Continental Shelf (to 200m)

Additional Information & Related Species

Additional Comments

The exact significance of this form is under review.
Similar in outline and contour but a thinner shell largely lacking nodules and incisions. Mostly coloured mottled, tan, greenish brown darker brown.

Related Species


Listed are literature citing Parvicardium exiguum var subangulatum (Scacchi, 1833). Reference containing the species Type Description is highlighted.


  • Conchological Society of Great Britain & Ireland
    Provides resources for understanding, identifying, recording, and conserving molluscs
    Check List of European Marine Mollusca
  • MarLIN
    The Marine Life Information Network for Britain and Ireland (MarLIN) provides information for marine environmental management, protection and education. It is a centre of excellence in spatially based and time-series marine biological information and supports good stewardship in the marine environment.
  • NBN Gateway
    National Biodiversity Network's Gateway. Use it to explore UK biodiversity data, as contributed by participating data providers.
  • BivAToL
  • MarBEF
  • Malacological Society
  • Unitas Malacologica
  • Census of Marine Life
  • MarBEF
    MarBEF, a network of excellence funded by the European Union and consisting of 94 European marine institutes, is a platform to integrate and disseminate knowledge and expertise on marine biodiversity, with links to researchers, industry, stakeholders and the general public.

Record last modified: 29/03/2022