Aplysiopsis toyamana (Baba, 1959)
Description
A small sacoglossan, 7 mm in length. Rhinophores auriculate; oral tentacles lobiform; foot-corners rounded. Cerata arranged in about 13 oblique rows on each side, with 2-3 cerata in each row. The ridge-like veins on the inner surface of the cerata are weaker and less densely branched than in the closely related Aplysiopsis orientalis. Body yellowish white in ground colour. A median black band on the head (a brown band in orientalis) extends forward along the anterior margin of the rhinophores; posteriorly the band becomes ill-defined but still extends down the back. Cerata grass-green with black tips. The outer surface of each ceras is often marked by a pair of brown bands running obliquely down from the tip, with an additional opaque-white median line on the outer surface; the branching veins on the inner surface are opaque white. Rhinophores with a longitudinal opaque white line. Sole yellowish white, with two longitudinal black bands (brown bands in orientalis).Distribution
Type locality: Abugashima, Toyama Bay, Japan. Additional type-series localities along the Toyama Bay coast (Amaharashi) and at Mera, Fukui Prefecture. Subsequently re-recorded among the Honshū and Okinawa filamentous-green-alga sacoglossan guild.Etymology
The specific epithet toyamana is a place-name adjective from Toyama, all type-series localities (Abugashima, Amaharashi) lying within Toyama Bay.Remarks
Original combination: Hermaeina (Hermaeina) toyamana. Hermaeina Trinchese, 1874 is treated as a junior synonym of Aplysiopsis. Tentatively separated from Aplysiopsis orientalis on the weaker veins on the inner surface of the cerata and on body-colour detail.References
- Hermaeina (Hermaeina) toyamana BABA, n. sp. Toyama-moumiusb,i (n. n.)., Baba K. (1959). THE FAMILY STILIGERIDAE FROM JAPAN (OPISTHOBRANCHIA-SACOGLOSSA). Publications of the Seto Marine Biological Laboratory. 7(3): 327-334. https://doi.org/10.5134/174635
- トヤマモウミウシ, 高岡高等学校生物研究会(編). (1964). 富山湾産後鰓類図譜.
- 高岡生物研究会. (2002). 日本海のウミウシ. 第2版.
- トヤマモウミウシ, 中野理枝. (2004). 本州のウミウシ. ラトルズ.
- Aplysiopsis toyamana, Trowbridge C.D., Hirano Y.M., Hirano Y.J., Nishida K. & Sudo K. (2011). North-west Pacific sacoglossan guild associated with filamentous green algae (Family Cladophoraceae and Family Boodleaceae). Marine Biodiversity Records. 4: e67. https://doi.org/10.1017/S1755267211000170
- トヤマモウミウシ, 中野理枝. (2019). 日本のウミウシ. 第二版. 文一総合出版.
- トヤマモウミウシ, 小野篤司 & 加藤昌一. (2020). 新版 ウミウシ. 誠文堂新光社.
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小野篤司 & 加藤昌一. (2020). 新版 ウミウシ. 誠文堂新光社.
誠文堂新光社
This species, Aplysiopsis toyamana, 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.