An updated inventory of sea slugs from Koh Tao, Thailand, with notes on their ecology and a dramatic biodiversity increase for Thai waters Mehrotra, Rahul A. Caballer Gutierrez, Manuel M. Scott, Chad Arnold, Spencer Monchanin, Coline Viyakarn, Voranop Chavanich, Suchana ZooKeys 2021 2021-06-09 1042 73 188 994D3877-8295-5897-A10A-AF3CBB17B9DC Mehrotra & A. Caballer Gutiérrez & M. Scott & Arnold & Monchanin & Viyakarn & Chavanich, 2021 Mehrotra & A. Caballer Gutiérrez & M. Scott & Arnold & Monchanin & Viyakarn & Chavanich 2021 Gastropoda Colinatydidae Colinatys CoL Animalia Colinatys Cephalaspidea 0 73 Mollusca genus sp.  Material examined. One specimen 3 mm, CB.  Ecology. Endobenthic in sand in coral reef habitats. Depth 3-11 m.  Distribution. The genus is currently recognised to be monospecific with  Colinatys alayoi(Espinosa & Ortea Rato, 2004) known from the Bahamas, Cuba, Florida, and Martinique Island ( Romani et al. 2015; Ortea Rato and Buske 2018). Indo-Pacific records are limited to specimens from Hawaii ( Oskars et al. 2015) and Japan ( SSW 2017) with species identity yet to be confirmed. Here representing a first record of the family from Thai waters.   Figure 6. A  Elysia pusilla7 mm B Elysia cf. tomentosa37 mm C Thuridilla cf. gracilis18 mm D  Colinatyssp. 3 mm E  Aliculastrum cylindricum30 mm F  Aliculastrum debilis28 mm G  A. debilis(shell 12 mm) captured alive and predated by Haptosquilla cf. nefanda H  Roxaniella multistriata9 mm I  Atys semistriatus8 mm J  Atyssp. 11 mm K  Diniatys dentifer5 mm L  Diniatys dubius6 mm.