The Echinoid Directory

Order Echinoida Troschal, 1872

[=Echinina Mortensen, 1942]

Diagnosis	Regular euechinoids with: imperforate, non-crenulate tubercles; peristome with shallow buccal notches; lantern with keeled teeth and epiphyses fused above the foramen magnum; perignathic girdle with auricles fused perradially; ambulacral plates compound in echinid style (lowest element the largest).
Range	?Maastrichtian (Late Cretaceous) to Recent; worldwide.
Remarks	The following taxon probably belongs here but is currently too poorly known to be placed into any family with certainty: Gajechinus Lambert & Thiery, 1914

Diagnosis

Regular euechinoids with:

Range

?Maastrichtian (Late Cretaceous) to Recent; worldwide.

Remarks

The following taxon probably belongs here but is currently too poorly known to be placed into any family with certainty:

Gajechinus Lambert & Thiery, 1914