Thuridilla gracilis (Risbec, 1928)
- Location
- Red Beach, Okinawa Island (East coast), Okinawa, Japan
- Date
- 2015/09/07
- Length
- 15mm
- Depth
- 11.0m
- Water temperature
- 28.0℃
Description
Ground colour deep green with numerous fine, milky white longitudinal lines. Parapodial margin orange-red. Rhinophore tips orange-red. Reaches 25 mm.Distribution
New Caledonia (type locality), and through the tropical western Pacific: Guam, Mariana Islands, Great Barrier Reef (Lizard Island, Queensland), Indonesia (North Sulawesi, Bali), Philippines (Luzon), Japan, Fiji, Marshall Islands. Records from the Indian Ocean and Red Sea are most likely misidentifications of cryptic congeners (Martín-Hervás et al., 2021).Etymology
Latin gracilis, "slender, graceful."Remarks
Originally described as Elysia gracilis Risbec, 1928. Molecular work by Martín-Hervás et al. 2021 reinstated Thuridilla ratna and Thuridilla bayeri (Er. Marcus, 1965), which had previously been treated as synonyms.References
- Elysia gracilis, Risbec J. (1928). Contribution à l'étude des nudibranches néo-calédoniens. Faune des Colonies françaises, Tome II: 1-328, 12 pls. (Société d'Éditions géographiques, maritimes et coloniales, Paris). [doctoral thesis monograph]
- バイエリ, 小野篤司. (1999). ウミウシガイドブック. TBSブリタニカ.
- タスジミドリガイ（新称）, 小野篤司. (2000). ウミウシガイドブック. 第2版. TBSブリタニカ.
- ツリディラ・グラキリス, 殿塚孝昌. (2003). ウミウシガイドブック〈3〉. TBSブリタニカ.
- タスジミドリガイ, 中野理枝. (2004). 本州のウミウシ. ラトルズ.
- タスジミドリガイ, 小野篤司. (2004). 沖縄のウミウシ. ラトルズ.
- タスジミドリガイ, 小野篤司 & 加藤昌一. (2009). ウミウシ. 誠文堂新光社.
- Yonow N. (2012). Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda). ZooKeys. 197: 1-129. https://doi.org/10.3897/zookeys.197.1728
- Thuridilla gracilis, Terrence Gosliner, Ángel Valdés and David Behrens. (2015). Nudibranch and Sea Slug Identification Indo-Pacific. New World Pubns Inc.
- Thuridilla gracilis, Martín‐Hervás M.D.R., Carmona L., Malaquias M.A.E., Krug P.J., Gosliner T.M. & Cervera J.L. (2021). A molecular phylogeny of Thuridilla Bergh, 1872 sea slugs (Gastropoda, Sacoglossa) reveals a case of flamboyant and cryptic radiation in the marine realm. Cladistics. 37(6): 647-676. https://doi.org/10.1111/cla.12465
Featured in this book
Terrence Gosliner, Ángel Valdés and David Behrens. (2018). Nudibranch and Sea Slug Identification Indo-Pacific 2nd Edition. New World Pubns Inc.
New World Publications
This species, Thuridilla gracilis, is included in the book.
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Same Genus Nudibranchs
Similar Colors Nudibranchs
Academic Database
Sea slug observation data is available in international marine biodiversity databases.