Gymnodoris nagoensis De Souza-Canal, R. Nakano & Á. Valdés, 2025
- Location
- Futami, Okinawa Island (Oura Bay), Okinawa, Japan
- Date
- 2017/02/18
- Length
- 10mm
- Depth
- 3.0m
- Water temperature
- 21.0℃
Description
Body elongate, smooth, lacking tubercles. Body color velvet black with blurry neon-blue lines visible on the mantle margin under certain light conditions. Rhinophores elongate (proportionally longer than in G. nigricolor), conical, fused at the base; the entire visible length of each rhinophore bears five transverse lamellae. Gill composed of 10 simple leaves arranged in a circle, lacking lamellae.Distribution
Type locality: Kouki, Nago, Okinawa Prefecture, Japan (10 m). Known from Okinawa main island and Amami Ōshima at depths of 3–30 m on sandy to silty bottoms.Etymology
Named after Nago, Okinawa Prefecture, Japan, the type locality.Remarks
Feeds on the fins of gobiid fishes by crawling into a goby's burrow; sometimes several individuals feed on the fins of the same goby simultaneously. Externally similar to G. boussionae n. sp. but distinguished by the smaller number of branchial leaves (10) and the proportionally longer rhinophores; differs from G. nigricolor in the elongate rhinophores and in lacking lamellae on the branchial leaves. Genetically very close to G. nigricolor (recovered as the same species in the ASAP analysis) but consistently distinct in the bPTP species delimitation, supporting recognition as a separate species.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 Gymnodoris nagoensis
Same Genus Nudibranchs
Similar Colors Nudibranchs
Academic Database
Sea slug observation data is available in international marine biodiversity databases.