Crowned jellyfish (Cnidaria: Scyphozoa: Rhizostomeae: Cepheidae) from waters off the coast of Pakistan, northern Arabian Sea

摘要

This report presents the occurrence of two species of crowned jellyfish, Cephea coerulea ?and Netrostoma setouchianum, ?recorded for the first time from waters off the coast of Pakistan in the northern Arabian Sea. Diagnosis of the genera Cephea and ?Netrostoma are ? provided. We also provide simple keys for the identification of cepheid genera. We found that long filaments on mouth arms in Cephea easily distinguish it from Netrostoma, which has no such filaments.