Although uncommon, almost one third of the ctenophore species present benthic habit. Some of them lost or just have vestigial ctene rows. Tentacles are generally much longer them the body and can be rapidly contracted into the bulbs. Captured preys are transferred from the tentacles to the mouth, at the bottom side, through ciliated furrows.

In the São Sebastião Channel we can find one species, Vallicula multiformis, although it is unconspicuous and hard to identify at a first look.

More data on Vallicula can be found in the 236th edition of Ciência Hoje (April 2007), in a text by Oliveira & Migotto. [Text in Portuguese]

Ctenophores from the Order Platyctenida

(Modified from Rankin, 1956: A, Coeloplana; B, Vallicula; C, Lyrocteis; D, Tjalfiella)

Benthic ctenophores?!