Gastropods

Antiopella cristata – Crested Aeolis

Description

Antiopella cristata, also known as the crested aeolis, is a striking sea slug belonging to the Janolidae family. It can grow up to 8 cm in length and has a flat, elongated body covered with numerous cerata (dorsal appendages). The tips of the cerata are pale blue, while the tips of the rhinophores (sensory tentacles) are white. A distinctive feature is the crest or tuft on its head, which gives the species its name.

Diet

Antiopella cristata feeds on erect bryozoans (moss animals), particularly species from the genera Alcyonidium, Bicellariella, Bugula, and Bugulina (e.g., Bugula neritina, Bugula plumosa).

Lifestyle

• Habitat: It lives in shallow waters, especially in kelp forests and on rocky substrates, at depths of up to 40 meters.
• Reproduction: Like many nudibranchs, it is a hermaphrodite (having both male and female reproductive organs).
• Defense Mechanism: When disturbed, it can autotomize its papillae, which continue to twitch after detachment, likely as a defense against predators.

Fun Facts

• Color Variations: Its body color can range from blue to orange and light brown, but the tips of the cerata are always blue.
• Distribution: It is found in the North Sea, Northeast Atlantic, and Mediterranean Sea.
• Parasites: It is sometimes infested by the ectoparasitic copepod Doridicola agilis