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Polycera abei (Baba, 1960) [Greilada]

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Polycera abei is characterized by its translucent whitish/yellowish body with orange pigment and black spots. The rhinophores, the gills and the velar appendages have also black pigment.
Note the very small specimen bottom right, just above the water sign.
Most of the specimens from the Philippines are translucent orange with black spots, and with black velar appendages.
Robert F. Boland cites Baba's original species description at his Okinawa Slug Site: "Length about 15mm. Body limaciform, smooth above (non-tuberculate), no pallial ridge on each side. Velar papillae 6, long and digitiform. Rhinophores perfoliate, non-retractile. Branchial plumes 7, simply pinnate, non-retractile; no exo-branchial appendage on each side of the gill. Oral veil semicircular; foot-corners angulated. General body-colour translucent yellowish white, the above with black spots interspersed among the orange ones. Rhinophores and velar papillae black; gills yellowish white with black tips; sole without markings."
There are 17 more pictures (as of 14 July 2016) from Japan (from where it was decribed) online, which show some variation in this species, most of them are translucent whitish with diffuse orange, only one specimen looks similar to those from the Philippines, the velar appendages vary from solid orange to orange with black tips to dark gray/black. Similar varies the colour of the gills.
Cory Pittman & Pauline Fiene write at seaslugsofhawaii.com: "There's some chance that this name has been used for animals representing more than one species."
More information on Polycera abei are at Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2020), published 9 April 2020, Polycera abei (Baba, 1960)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Polycera_abei.htm

 
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