Coelopleurus longicollis A. Agassiz & H.L. Clark

Family: Arbaciidae

Order: Arbacioida

Locality: China Sea

Dimensions: 43 Ø x 26 mm

According to Dr. Simon Coppard this is a Coelopleurus longicollis, but, of course, for a 100% certainty spines and pedicellariae are necessary.