Spinoaglaja orientalis (Baba, 1949)
- Location
- Horse Shoes, Okinawa Island (Onna and Yomitan area), Okinawa, Japan
- Date
- 2006/11/10
- Length
- 10mm
- Depth
- 5.0m
- Water temperature
- 24.0℃
Description
A small aglajid, 5-18 mm in body length, slightly more elongate than congeners. A low, blunt transverse ridge sits just behind the anterior end of the head-shield. The two posterior leaflets of the rear head-shield are equal in size. Body colour dark brown, with white fine dots scattered on the dorsum and outer faces of the parapodia. Two parallel black transverse bands (separated by a narrow yellow band) run across the dorsum: one across the anterior transverse ridge, the other across the posterior end of the head-shield, extending laterally onto both parapodial margins. Black patches are scattered on the anterior parapodial edges. The posterior leaflets of the head-shield bear a marginal series of small yellow spots, with an additional black band just inside.Distribution
Type locality is off Kurosaki, Sagami Bay (600 m offshore, 15 m depth, August 1939) and Hayama-Koiso, Sagami Bay (intertidal, August 1939). The original description (Baba, 1949) records the species only from Sagami Bay.Etymology
The specific epithet orientalis is Latin for of the East. The original description does not give an explicit etymology paragraph; the descriptive sense (eastern occurrence) is self-evident from context.Remarks
Originally described as Aglaia orientalis and later transferred to Spinoaglaja. Distinguished from the striped congener Aglaia lineolata by the two-banded transverse colour pattern.References
- Spinoaglaja orientalis (Baba, 1949), Baba K. (1949). Opisthobranchia of Sagami Bay collected by His Majesty the Emperor of Japan (相模湾産後鰓類図譜). Iwanami Shoten, Tokyo. 4+2+194+7 pp., pls. 1-50.
- トウヨウキセワタ, 高岡高等学校生物研究会(編). (1964). 富山湾産後鰓類図譜.
- トウヨウキセワタ, 小野篤司. (2004). 沖縄のウミウシ. ラトルズ.
- トウヨウキセワタ, 中野理枝. (2004). 本州のウミウシ. ラトルズ.
- トウヨウキセワタ, 小野篤司 & 加藤昌一. (2009). ウミウシ. 誠文堂新光社.
- Philinopsis orientalis, Terrence Gosliner, Ángel Valdés and David Behrens. (2015). Nudibranch and Sea Slug Identification Indo-Pacific. New World Pubns Inc.
- Andrea Zamora-Silva and Manuel António E. Malaquias Molecular phylogeny of the Aglajidae head-shield sea slugs (Heterobranchia: Cephalaspidea): new evolutionary lineages revealed and proposal of a new classification Zoological Journal of the Linnean Society, 2017
- トウヨウキセワタ, 小野篤司 & 加藤昌一. (2020). 新版 ウミウシ. 誠文堂新光社.
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, Spinoaglaja orientalis, is included in the book.
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Photos of Spinoaglaja orientalis
Same Genus Nudibranchs
Similar Colors Nudibranchs
Academic Database
Sea slug observation data is available in international marine biodiversity databases.