Fig. 18From: Roveacrinida (Crinoidea) from Late Triassic (early Carnian) black shales of Southwest China Osteocrinus sinensis n. sp., Lower Xiaowa Formation, Wolonggong. Two short secundibrachials from median arm region articulated by synostosis, the upper is broken near the muscular facet, note adoral spine on the secundibrachial at the top; MHI 2137/2/1. SEM photograph BonnBack to article page