Bryozoans and other encrusting organisms are common on pebbles and rocks in the intertidal zone.

Éfira.

Medusa.

Distal introvert.

Ossicles viewed through body wall.

Larva.

Adult specimen.

Porpita is a colonial hydrozoan which lives floating on the sea surface. The polyps are arranged concentrically on the lower surface of a hard, chitinous central disk. There is a large central polyp (gastrozooid) around of which are arranged numerous gastro-gonozoids, polyps responsible for food intake and production of jellyfish. The dactilozooids are the polyps responsible for capturing food and defense, being located more externally.

Porpita is a colonial hydrozoan which lives floating on the sea surface. The polyps are arranged concentrically on the lower surface of a hard, chitinous central disk. There is a large central polyp (gastrozooid) around of which are arranged numerous gastro-gonozoids, polyps responsible for food intake and production of jellyfish. The dactilozooids are the polyps responsible for capturing food and defense, being located more externally.

Larva.

A consumer feeding on the fouling community, the crab Cronius ruber competes with the introduced crab Charybdis hellerii of the Indo-Pacific .

Distal introvert.

The sea pansy is a collection of polyps having different forms and functions, being common in sand flats in protected areas.

The sea pansy is a collection of polyps having different forms and functions, being common in sand flats in protected areas.

Porpita is a colonial hydrozoan which lives floating on the sea surface. The polyps are arranged concentrically on the lower surface of a hard, chitinous central disk. There is a large central polyp (gastrozooid) around of which are arranged numerous gastro-gonozoids, polyps responsible for food intake and production of jellyfish. The dactilozooids are the polyps responsible for capturing food and defense, being located more externally.

The fire-worms are benthic animals that live under rocks and among other marine organisms; they have white, numerous, and large bristles that may cause skin irritation.

Porpita is a colonial hydrozoan which lives floating on the sea surface. The polyps are arranged concentrically on the lower surface of a hard, chitinous central disk. There is a large central polyp (gastrozooid) around of which are arranged numerous gastro-gonozoids, polyps responsible for food intake and production of jellyfish. The dactilozooids are the polyps responsible for capturing food and defense, being located more externally.

Adult specimen.

Adult medusa.

Male colony.

Skeleton of a sand dollar.

Adult medusa.