New Ecological Observations and Occurrence for Asteroidea and Echinoidea in Hong Kong Author Yiu, Sam King Fung 0000-0001-6212-7339 School of Biological Sciences, The University of Hong Kong, Hong Kong, China. cyclesamyiu @ hotmail. com; https: // orcid. org / 0000 - 0001 - 6212 - 7339 cyclesamyiu@hotmail.com Author Mah, Christopher L. 0000-0001-6212-7339 School of Biological Sciences, The University of Hong Kong, Hong Kong, China. cyclesamyiu @ hotmail. com; https: // orcid. org / 0000 - 0001 - 6212 - 7339 & Department of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington D. C. brisinga @ gmail. com; https: // orcid. org / 0000 - 0002 - 0178 - 8237 & School of Biological Sciences, The University of Hong Kong, Hong Kong, China. cyclesamyiu @ hotmail. com; https: // orcid. org / 0000 - 0001 - 6212 - 7339 cyclesamyiu@hotmail.com text Zootaxa 2024 2024-10-22 5526 1 1 69 http://dx.doi.org/10.11646/zootaxa.5526.1.1 journal article 10.11646/zootaxa.5526.1.1 1175-5334 14021526 987FAD00-32A7-4E38-AFAD-6EAC8D808FB2 Ophidiaster armatus Koehler 1910 FIGURE 37A–B Comments Images of this species were only taken of the abactinal surface. Diagnostic furrow spine characters were not observed. However, the R/r ratio as well as the size of the individuals were most consistent with descriptions outlined by Liao & Clark (1995) . In situ observations showed this species to be brown to light green with darker bands across the arms with dark papular areas. Both four and six-rayed variants of this species were observed.A 6-rayed specimen was observed at the Ninepins Islands, Hong Kong ( Fig. 37B ) Occurrence/Distribution Hong Kong , 10–20 m . Outside Hong Kong , central Pacific, Southern China , Taiwan , Andaman Islands, Queensland and Are Islands. 5–40 m ( Marsh & Fromont 2020 ).