Elysia hamatanii Baba, 1957

Description

A small Elysia reaching 5-13 mm in length. The black bands on the head are more accentuated than in E. hirasei: three black bands run from between the rhinophores to the anterior end of the pericardium, and an additional black band lies immediately below the eyes on each side. The paired rhinophores are linked by a black transverse band across the front of the head. General body colour yellowish green or grass-green; the outer surface of the parapodia is somewhat darker with white spots throughout.

Distribution

Type locality: Seto, Kii Province (Wakayama Pref., Japan), near the Seto Marine Biological Laboratory of Kyoto University. Subsequently recorded along the Pacific coast of Honshu on filamentous green algae.

Etymology

The specific epithet hamatanii honours Iwao Hamatani, the collector of the type material.

Remarks

A Japanese sacoglossan associated with filamentous green algae on temperate Pacific coasts.

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References

• Elysia (Elysia) hamatanii BABA, n. sp. Hamatani-midorigai (n.n.), Baba K. (1957). THE SPECIES OF THE GENUS ELYSIA FROM JAPAN. Publications of the Seto Marine Biological Laboratory. 6(1): 69-74. https://doi.org/10.5134/174573
• 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