Low Ri's picture

Little cockle?

Observed: 24th January 2011 By: Low Ri

Solid, off white cockle around 1.5cm length & width. Radiating ribs / ridges and some concentric ridges / growth lines.

Species interactions

No interactions present.


BeckyH's picture

My Collins says 24-28 ribs :)

My Collins says 24-28 ribs :)

Mike Kendall's picture

The teeth matter

The books I've looked at say Parvicardium has up to 22 broad ribs; Cerastoderma has around 24 (or if you look in 60 year old books 24-28). The problem of course is the extent of variability.

A better way to separate the two species is to look at the shell teeth. Cerastoderma has two posterior lateral teeth, Parvicardium has one.

Mike Kendall