Divarilima is a genus of marine bivalve molluscs in the family Limidae, the file shells or file clams.

Description

Illustration of D. albicoma by William Healey Dall(1902)

In the original description, Powell described the genus as below:

It is a miniature Lima with a Ctenoides sculptural pattern of divaricating threads. It resembles the typical species except that a mature stage of arrested growth is reached at a small size, corresponding with the early post-larval stages in Lima typical.

Members of the genus are small, trigonally ovate, strongly inequilateral, and have sharp. backward-pointing umbones. The anterodorsal outline almost straight, extended, coinciding with well-marked a umbonal ridge which borders a concave lunule.

Taxonomy

The genus was first described by A. W. B. Powell in 1958, who named Lima sydneyensis as the type species of the genus. The genus is in the family Limidae.

Distribution

Divarilima is found in oceans across the globe, including waters near Japan, the western Atlantic, South Africa, Australia and New Zealand.

Species

Species within the genus Divarilima include:

  • Divarilima abscisa (Barnard, 1964)
  • Divarilima albicoma (Dall, 1886)
  • † Divarilima aucklandensis (Laws, 1950)
  • Divarilima elegans Hayami & Kase, 1993
  • Divarilima handini J. Gibson-Smith & W. Gibson-Smith, 1982
  • Divarilima iwaotakii (T. Habe, 1961)
  • Divarilima sydneyensis (Hedley, 1904)

Further reading

External links

  • at SealifeBase