Abstract

Shallow-water sea stars of the Bay of Nhatrang (Southern Vietnam) and their obligatory macrosymbionts are studied. A total of 39 sea star species of 13 families are recorded; 19 of them are new for the Vietnamese fauna. More than half of species (61.6%) belong to the families Oreasteridae and Ophidiasteridae. The fauna of obligatory macrosymbionts of sea stars of the Bay of Nhatrang includes 21 species (including one sedentary ctenophoran, five polychaetes, four mollusks, two shrimps, eight copepods, and one fish), 18 of which are recorded in Vietnam for the first time. The taxonomic composition of sea stars and fauna of their symbionts have shown a high species diversity of these groups in the Bay of Nhatrang compared to other regions.

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