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Family CRANIIDAE Menke, 1828

Introduction

Occurence: ?Mid Cambrian, Later Ordovician to Recent.

 

Diagnosis

Shell calcareous, punctate, punctae in branchial valve, branching in some Recent genera, arborescently towards distal end. Branchial valve usually conical, pedicle valve subconical or convex when free, conforming to shape of surface of attachment when fixed. Principal muscles consist of two pairs of adductors traversing shell dorsoventrally and two pairs of oblique muscles. Recent species with anus posteriorly placed on mid-line of shell, no marginal setae. From Moore (1965A: H289) and Lee (1986: 143).

 

History of changes

Note that this list may be incomplete for dates prior to September 2013.
Published As part of group Action Date Action Type Compiler(s)
12-Feb-2010 (import)