The Echinoid Directory

Key to the genera of Micropygidae

1a.Ambulacral plates with a single large primary tubercle. Interambulacral plates (illustrated above) with a single row of primary tubercles.

Micropyga

1b.Ambulacral plates with two or three subequal tubercles. Interambulacral plates with a double offset row of primary tubercles adradially.

Kierechinus