White Flabellina

Luisella babai can reach a length of about 30–53 millimetres (1.2–2.1 in). Body is usually white to light blue, elongated and translucent with a white edge and a long sharp pointed tail. Cerata are arranged in groups of 3–9. They show the same body color with yellow-orange rings on the terminal parts. The two long tentacles in their anterior part have the same color of the body. Also the two rhinophores in their upper part shows the same color of the body, with a yellow terminal part. Digestive system and liver are visible in transparency. This species is rather similar to Samla bicolor (Kelaart, 1858), but S. bicolor can be found only in the Indo-Pacific.

This species was described from the Mediterranean Sea where it is a fairly common species. It is also present in the Adriatic Sea and it has also been reported from the Atlantic coasts of Spain, Portugal and Senegal. It inhabits rocky bottoms at depths of 5 to 50 m.