An updated inventory of sea slugs from Koh Tao, Thailand, with notes on their ecology and a dramatic biodiversity increase for Thai waters Author Mehrotra, Rahul Reef Biology Research Group. Department of Marine Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand & Aow Thai Marine Ecology Center, Koh Mun Nai, Kram, Klaeng District, Rayong 21110, Thailand Author A. Caballer Gutierrez, Manuel American University of Paris, Department of Computer Science Math and Environmental Science, 6 rue du Colonel Combes, 75007 Paris, France & Museum national d'Histoire naturelle, 55 rue de Buffon, 75005 Paris, France Author M. Scott, Chad Conservation Diver. 7321 Timber Trail Road, Evergreen, Colorado, 80439, USA Author Arnold, Spencer Conservation Diver. 7321 Timber Trail Road, Evergreen, Colorado, 80439, USA Author Monchanin, Coline Aow Thai Marine Ecology Center, Koh Mun Nai, Kram, Klaeng District, Rayong 21110, Thailand & Research Center on Animal Cognition (CRCA), Center for Integrative Biology (CBI); CNRS, University Paul Sabatier, Toulouse III, France Author Viyakarn, Voranop https://orcid.org/0000-0002-2089-6356 Reef Biology Research Group. Department of Marine Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand Author Chavanich, Suchana https://orcid.org/0000-0001-6266-7300 Reef Biology Research Group. Department of Marine Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand & Center of Excellence for Marine Biotechnology, Department of Marine Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand suchana.c@chula.ac.th text ZooKeys 2021 2021-06-09 1042 73 188 http://dx.doi.org/10.3897/zookeys.1042.64474 journal article http://dx.doi.org/10.3897/zookeys.1042.64474 1313-2970-1042-73 9CF986D86A474E179A67245C78FB8AFD 1BB0A10A35DD5541850FDAFFDB7119C2 * Hallaxa iju Gosliner & Johnson, 1994 Figure 9A Material examined. One specimen 10 mm , SO. Ecology. Among rubble in coral reef and reef edge habitats. Associated with an unidentified pale/creamy white sponge. Depth 4-12 m. Distribution. Across the Pacific including Australia ( Nimbs and Smith 2016 ), the Philippines, Papua New Guinea, Japan, the Marshall Islands ( Gosliner and Johnson 1994 ), Hong Kong, and Hawaii ( Gosliner et al. 2008 ). Here representing a first record for Thai waters. Figure 9. A Hallaxa iju 10 mm B Hallaxa indecora 8 mm C Cadlinella ornatissima 30 mm (photograph by Mati Pauner) D Ceratosoma tenue 85 mm E Chromodoris mandapamensis 50 mm (photograph by Tine Kvamme) F Chromodoris cf. mandapamensis 7 mm G Chromodoris cf. balat 25 mm (photograph by Elouise Haskin) H Diversidoris aurantionodulosa 30 mm I Diversidoris crocea 8 mm (photograph by Pau Urgell Plaza) J Doriprismatica atromarginata 60 mm K Glossodoris cf. cincta 40 mm L Goniobranchus cf. albonares 5 mm.