''Hemipneustidae'' is an extinct family of

sea urchin Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) of ...

s.WoRMS
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Genera

* ''

Hemipneustes ''Hemipneustes'' is an extinct genus of sea urchins belonging to the family Holasteridae. These semi-infaunal detritivores lived during the Upper Cretaceous period, from 70.6 to 66.043 million years ago. Fossils of this genus have been found in ...

'' L. Agassiz, 1835 † * '' Medjesia'' Jeffery, 1997 † * '' Opisopneustes'' Gauthier, 1889 † * '' Plesiohemipneustes'' Smith & Wright, 2003 † * ''

Toxopatagus ''Toxopatagus'' is an extinct genus of sea urchin Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal se ...

'' Pomel, 1883 †

References

Holasteroida {{paleo-echinoidea-stub