The Echinoid Directory

Actinocidaris thomasi (Agassiz & Clark, 1907); Recent, off Hawaii. Lateral view. From Agassiz, A. & Clark, H. L. 1907. Hawaiian and other Pacific Echini. Memoirs of the Museum of Comparative Zoology at Harvard University 34(1), 1-42, pls 1-42 (pl. 28, fig. 1).

Test diameter 70 mm.