Plakobranchidae Gray, 1840

Chow, Lai Him, Yu, Vriko Pik Fan, Kho, Zi Yi, See, Gomen Chun Lung, Wang, Adam, Baker, David M. & Tsang, Ling Ming, 2022, Garypus sanasai Lin, Huang & Chang 2022, sp. nov., Zoological Studies 61 (52), pp. 1-33 : 28

Family Plakobranchidae Gray, 1840

242. Elysia atroviridis Baba, 1955

Previous HK record: Jensen (1985 1998 2003).

Distribution: western Pacific ( Hong Kong, Japan, South Korea) ( Jensen 2003).

243. Elysia chilkensis Eliot, 1916

Previous HK record: Jensen (1985 1992 1998 2003).

Distribution: Indo-West Pacific ( Hong Kong, India, Thailand) ( Jensen 2003).

244. Elysia hirasei Baba, 1955

Previous HK record: Rudman (2005).

Distribution: Indo-West Pacific ( Hong Kong, India, Thailand, Japan, possibly South Africa) ( Rudman 2005).

245. Elysia flavomacula Jensen, 1990 * ( Fig. 10L ) Previous HK record: Jensen (1990 1998 2003).

Distribution: western Pacific ( Hong Kong, South Korea) ( Jensen 2003; Hong et al. 2008).

246. Elysia cf. japonica Eliot, 1913 * ( Fig. 10M ) Previous HK record: Jensen (1985 1998 2003) (as Elysia japonica ).

247. Elysia leucolegnote Jensen, 1990 * ( Fig. 10N ) Previous HK record: Jensen (1990 1992 1998 2003).

Distribution: Indo-West Pacific ( Hong Kong, Andaman Islands, Thailand, the Philippines) ( Sanchez-Escalona 2019).

248. Elysia marginata (Pease, 1871) * ( Fig. 10O ) Previous HK record: None.

Distribution: Indo-Pacific (from East Africa to Japan, Australia, Guam, Fiji, French Polynesia and Hawaii) ( Mehrotra et al. 2021).

249. Elysia nigrocapitata Baba, 1957

Previous HK record: Jensen (1985 1998 2003).

Distribution: western Pacific ( Hong Kong, Japan, South Korea) ( Jensen 2003).

250. Elysia obtusa Baba, 1938 * ( Fig. 10P )

Previous HK record: Jensen (1998 2003), Coleman (2008).

Distribution: Indo-Pacific ( Hong Kong, India, Taiwan, Japan, South Korea, Australia, Marshall Islands, Hawaii) ( Mehrotra et al. 2021).

251. Elysia trisinuata Baba, 1949 * ( Fig. 10Q )

Previous HK record: Jensen (1985 1992 1998 2003).

Distribution: western Pacific ( Hong Kong, Hainan Island, Taiwan, Japan) ( Jensen 1998).

252. Elysia verrucosa Jensen, 1985 * ( Fig. 10R ) Previous HK record: Jensen (1985 1998 2003).

Distribution: western Pacific ( Hong Kong, Taiwan) ( Coleman 2008).

253. Elysia sp. 1 * ( Fig. 11A )

Previous HK record: None.

254. Elysia sp. 2 * ( Fig. 11B )

Previous HK record: None.

255. Thuridilla gracilis (Risbec, 1928) * ( Fig. 11C ) Previous HK record: Jensen (2003) (as Thuridilla bayeri ).

Distribution: Indo-Pacific (from East Africa to Japan, Guam, Australia, Fiji and Marshall Islands) ( Mehrotra et al. 2021).

Figures

Fig. 10. (A) Gastropteron minutum; (B) Siphopteron makisig; (C) Philine paucipapillata; (D) Paromoionchis tumidus; (E) Lobiger sagamiensis; (F) Oxynoe viridis; (G) Costasiella cf. kuroshimae; (H) Ercolania boodleae; (I) Placida daguilarensis; (J) Placida kevinleei; (K) Stiliger ornatus; (L) Elysia flavomacula; (M) Elysia cf. japonica; (N) Elysia leucolegnote; (O) Elysia marginata; (P) Elysia obtusa; (Q) Elysia trisinuata; (R) Elysia verrucosa. Photographs by Alice Au (A), AFCD | Kevin Kin Chung Leung (B), Tim Lam (C, H–K), Chandler Tsang (D), AFCD (E, F, M, Q), Grape Tang (G), Gomen See (L), Sunny Chan (N), AFCD | Joseph Leung (O), Markus Rummel (P) and Simon Lorenz (R).

Fig. 11. (A) Elysia sp. 1; (B) Elysia sp. 2; (C) Thuridilla gracilis. Photographs by Tim Lam (A, B) and AFCD (C).