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Elysia cf. hirasei

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Elysia cf. hirasei

Author: Undescribed

Order: Sacoglossa  Family: Plakobranchidae

Maximum Size: 30 mm

Sightings: Whitsundays

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Elysia cf. hirasei Undescribed

Limaciform body shape, translucent green in colour. Parapodia tend to meet at the midline from approximately one third to halfway posteriorly from the rhinophores. The anterior margin appears to have an indent. The auriculate rhinophores are not especially long and present with black pigment on the tips and running down their anterior faces. Parapodial edges carry a cream to brown band and cream to brown spotted patches are distributed over the external surface. A distinctive pattern of black pigment is arranged upon the head and neck thus: a median black band runs posteriorly from between the rhinophores and between the eye spots almost reaching the parapodia – also on each side from the anterior point of the parapodia a black patch bifurcates to run anteriorly each side of the eyespots. This black pattern on the head/neck is said to be characteristic of Elysia hirasei but this is not that species.

As with almost all sacoglossans it feeds by piercing the cell wall of algae and sucking out the contents.

Baba, 1949 originally called Elysia hirasei Elysia viridis (Plate 8 Fig. 25) however in Baba, 1955 he redescribed it as Elysia hirasei.

David A. Mullins – December 2023

References:
– ​Baba, K. (1949) Opisthobranchia of Sagami Bay collected by His Majesty The Emperor of Japan. Iwanami Shoten, Tokyo.

– ​Rudman, W. B. (2005 April 14) Elysia hirasei Baba, 1955. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/elyshira and associated messages.

– Jensen, K. R. (2007). Biogeography of the Sacoglossa (Mollusca, Opisthobranchia). Bonner Zoologische Beiträge. 55: 255–281

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