Gymnodoris okinawae Baba, 1936
- Location
- Horse Shoes, Okinawa Island (Onna and Yomitan area), Okinawa, Japan
- Date
- 2015/01/25
- Length
- 12mm
- Depth
- 5.0m
- Water temperature
- 21.0℃
Description
A medium-sized Gymnodoris, about 40 mm long, limaciform. The head is indistinctly expanded into a subquadrate veil; the body swells in the middle (at the gill position) and tapers to an elongated tail. The back passes into the sides without clear demarcation, and is sparsely covered with indistinct tubercles. The head bears a pair of small conical, perfoliated rhinophores, retractile within sheaths. The branchial plumes are rather small, tripinnate, 9 in number, non-retractile, and arranged in a circle around the anal papilla. The foot is linear, with the anterior end obtusely truncated and the hinder end passing off into a pointed tail. The mouth lies in front of the foot and is flanked by a pair of lobe-like oral tentacles.The ground colour is pale yellow; the upper surface is ornamented with orange-yellow spots and short streaks, and the perfoliated portions of the rhinophores are tinged with orange-yellow.
Distribution
Type locality: Ishigaki-shima, Ryukyu Islands.Etymology
The specific epithet okinawae is a place-name genitive referring to Okinawa, the locality also used in the title of the original paper on Ryukyu opisthobranchs.Remarks
Gymnodoris is carnivorous and its members are known to feed on other opisthobranchs.References
- Gymnodoris okinawae, Baba K. (1936). Opisthobranchia Of The Ryukyu (Okinawa) Islands. Journal of the Faculty of Agriculture, Kyushu University. 5(1): 1-50. https://doi.org/10.5109/22580
- ハクテンオバキュウウミウシ（仮称）, 益田一. (1999). 海洋生物ガイドブック. 東海大学出版会.
- シロボシキヌハダウミウシ, 益田一. (1999). 海洋生物ガイドブック. 第2刷. 東海大学出版会.
- シロボシキヌハダウミウシ（仮称）, 小野篤司. (1999). ウミウシガイドブック. TBSブリタニカ.
- オキナワキヌハダウミウシ, 小野篤司. (2004). 沖縄のウミウシ. ラトルズ.
- オキナワキヌハダウミウシ, 中野理枝. (2004). 本州のウミウシ. ラトルズ.
- オキナワキヌハダウミウシ, 小野篤司 & 加藤昌一. (2009). ウミウシ. 誠文堂新光社.
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
Shooting Locations
Loading shooting locations...
Photos of Gymnodoris okinawae
Tag:
Same Genus Nudibranchs
Similar Colors Nudibranchs
Academic Database
Sea slug observation data is available in international marine biodiversity databases.