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 Nacospatangus altus (A. Agasszi 1864) FIGURE 23A–D FIGURE 23. Nacospatangus altus dried test. A. Aboral surface. B. Oral surface. C–D. Lateral views. Comments This species was identified in Liao & Clark (1995) as Pseudomaretia alta with subsequent placement into Nacospatangus by Schultz (2009). This species was is the first record of this species from Hong Kong , where it is rarely encountered. Only two sightings of this species were observed from wave-exposed habitat. Specimens collected from this area show a larger peristome when compared with that of Liao & Clark (1995) and Schultz (2017) . Occurrence/Distribution Hong Kong , 10 m . Outside Hong Kong . Central and Southern Japan , Philippines , South Pacific , Mauritius , Indian Ocean 2– 204 m .