Favorinus pacificus Baba, 1937
Description
A small aeolid, body length about 10 mm. The antero-lateral corners of the head are continued out into two exceedingly slender oral tentacles. The rhinophores are a little shorter and cylindrico-conical, with indistinct constrictions along the whole length. The margin of the back bears fusiform branchial papillae in 7 oblique rows on each side, the largest on the inside and the smallest outside: about 3 in the 1st-4th rows, and 2 in the succeeding rows. The foot is fairly narrow, passing off to a point behind; the front edge is rounded, with the corners produced outward into tentaculiform processes. The general colour of the body is translucent white, as are the oral tentacles, tail and foot; the rhinophores are chocolate-tinted except at the distal third, which is colourless. The branchial papillae are dark yellow almost up to the tip, which terminates in a white cap with a purple marking below.Distribution
Type locality: Tomioka, Amakusa (Kumamoto Pref., Japan).Etymology
The specific epithet pacificus is the Latin adjective "of the Pacific Ocean", a geographic naming indicating that this Favorinus was first recorded from Pacific (Japanese) waters.Remarks
Family Aeolidiidae, subfamily Favorininae.References
A Kindle field guide by the site author
Kimoto N. (2026). Sea Slugs of Japan & the Indo-Pacific, 2nd Edition.
Kindle Edition
View on Amazon PR (Amazon Associates)Seasonality
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Photos of Favorinus pacificus
Tag:
Same Genus Nudibranchs
Similar Colors Nudibranchs
Academic Database
Sea slug observation data is available in international marine biodiversity databases.