Atelostomata
Introduction The '''Atelostomata''' are a type of sea urchins. They are distinguished from other sea urchins by their irregular shape and the absence of a feeding lantern. The group includes the well known heart urchins, as well as some less familiar and extinct forms.
List of orders * order Holasteroida (Durham & Melville, 1957)* order Spatangoida (L. Agassiz, 1840)
References * *