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Elysia grandifolia

2023 · Photo: Boaz Liebes

Elysia grandifolia Kelaart, 1858

Philippines · Indo Pacific - South China Sea

Migrant species Observed: 2001–2024
Size
⁦50–100⁩ mm · max 120 mm
Depth
⁦0–15⁩ m
Native range
Indian Ocean (Sri Lanka, southern India) and the Red Sea

Description

A large, leaf-like sacoglossan sea slug. It is "solar-powered": it keeps the chloroplasts of the algae it eats alive in its own body. By 2012 Israel had a large breeding population.

Share link: https://seaslugs.org.il/species/elysia-grandifolia-phillipines-indo-pacific-south-china-sea/

Identification

Light green body with small white spots. Very large, thin, veined green flaps (parapodia) on each side, edged with touching black and orange bands. Rolled, ear-like rhinophores.

Similar species

Elysia ornata usually has white between the black and orange bands and is smaller. The native Elysia timida is small and white with red specks.

Habitat & diet

Habitat

Rocky shores covered in Bryopsis algae, lagoons and piers; ~0.5–8 m.

Food

Sucks sap from green algae of the genus Bryopsis and keeps their chloroplasts.

In the Mediterranean

  1. 2001First recordÜç Adalar, Antalya, Turkey (5 m)
  2. 2024Latest documented recordLipsi, Aegean Sea, Greece
Status
Established (large population in Israel)
Route of arrival
Lessepsian (Suez Canal)
Sources (3)
Elysia grandifolia