Sea urchins of Hong Kong: corrections of misidentifications and an updated species list

Abstract

The monograph by Yiu & Mah (2024) on the ecology and occurrences of echinoderms in Hong Kong reported 25 echinoid species observed during more than 1500 SCUBA dives, including 11 new species records. However, the identifications of five species are problematic. The specimen identified as Echinometra mathaei (Blainville) (Figure 7, page 16) is the yet unnamed species Echinometra sp. A, which was discovered in the 1980s. The specimens identified as Pseudoboletia indiana (Michelin) (Figure 15, page 25) are Pseudoboletia maculata Troschel. The specimen identified as Brissus latecarinatus (Leske) (Figure 18, page 28) is Brissus agassizii Döderlein. The specimen identified as Metalia spatagus (Linnaeus) (Figure 19, page 29) is Metalia angustus de Ridder. The specimen identified as Peronella lesueuri (Agassiz) (Figure 21, page 31) is Laganum decagonale (Blainville). After these corrections, updated Hong Kong echinoid records from published literature were provided and discussed herein (Table S1). The species list of sea urchins in Hong Kong water includes 42 species (18 families) to date.

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ORCID for Chia-Hsin Hsu: orcid.org/0009-0007-2540-5660

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