Phanerophthalmus perpallidus Risbec, 1928
- Location
- Nazumado, Hachijo Island, Tokyo, Japan
- Date
- 2016/07/12
- Length
- 10mm
- Depth
- 12.0m
- Water temperature
- 26.0℃
Description
A small cephalaspidean reaching about 8 mm in body length. Body white to translucent with brown or green speckles scattered across the parapodial lobes and cephalic shield, and red-orange dots on the mantle. Cephalic shield triangular with a small posterior notch, often paler or white toward the rear, sometimes arrow-shaped. Margins of the parapodial lobes are richly pigmented with white. Eyes faintly visible through the body wall; periocular area pigmented. Shell external, oval, with both anterior and posterior ends rounded; shoulder not developed posteriorly.Distribution
West and Central Pacific, recorded from the Ryukyu Islands of Japan, northern Papua New Guinea, New Caledonia, French Polynesia and Hawaii. The species was originally described from a single fixed specimen from Noumea, New Caledonia. The type material is lost, and a neotype from Hekili Point, Maui, Hawaii (ZMBN 81693) was later designated.Etymology
From the Latin perpallidus, meaning "very pale" or "wan", referring to the species' pale, translucent body colour.Remarks
The sister species Phanerophthalmus lentigines closely resembles P. perpallidus in colour and morphology but is genetically distinct. P. perpallidus is restricted to the West and Central Pacific while P. lentigines ranges across the Indian and Western Pacific; the two are likely sympatric around Papua New Guinea and the Ryukyu Islands. The species inhabits intertidal to shallow subtidal habitats down to about 20 m, on coarse sand, rubble and hard bottoms of back-reef, fore-reef and outer-reef areas.References
- Phanerophthalmus perpallidus n.sp., 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]
- チョウチョウミドリガイ属の1種, 中野理枝. (2004). 本州のウミウシ. ラトルズ.
- コクテンチョウチョウミドリガイ（新称）, 中野理枝, 今川郁 & 今本淳. (2013). 南西諸島の後鰓類1. 頭楯亜目. ちりぼたん. 43(1-4): 1-22.
- Phanerophthalmus perpallidus, Austin J., Gosliner T. & Malaquias M.A.E. (2018). Systematic revision, diversity patterns and trophic ecology of the tropical Indo-West Pacific sea slug genus Phanerophthalmus A. Adams, 1850 (Cephalaspidea, Haminoeidae). Invertebrate Systematics. 32(6): 1336-1387. https://doi.org/10.1071/is17086
- コクテンチョウチョウミドリガイ, 中野理枝. (2018). 日本のウミウシ. 文一総合出版.
- Phanerophthalmus perpallidus, Terrence Gosliner, Ángel Valdés and David Behrens. (2018). Nudibranch and Sea Slug Identification Indo-Pacific 2nd Edition. New World Pubns Inc.
- Oskars T.R., Too C.C., Rees D., Mikkelsen P.M., Willassen E. & Malaquias M.A.E. (2019). A molecular phylogeny of the gastropod family Haminoeidae sensu lato (Heterobranchia: Cephalaspidea): a generic revision. Invertebrate Systematics 33(3): 426-472.
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, Phanerophthalmus perpallidus, is included in the book.
View on Amazon PR (Amazon Associates)Seasonality
Shooting Locations
Loading shooting locations...
Photos of Phanerophthalmus perpallidus
Same Genus Nudibranchs
Similar Colors Nudibranchs
Academic Database
Sea slug observation data is available in international marine biodiversity databases.