Cestidae

Family of comb jellies

Cestidae is a family of comb jellies within the class Tentaculata. This family is notable for its unique body structure and locomotion, which distinguishes it from other ctenophores. Members of the Cestidae family are commonly referred to as "Venus girdles" due to their ribbon-like appearance.

Description

Venus girdle at Rocky Bay

Cestidae are characterized by their elongated, ribbon-like bodies that can reach lengths of up to 1.5 meters. Unlike other ctenophores, which typically have a more rounded or oval shape, Cestidae have a flattened, band-like form. This unique morphology allows them to move gracefully through the water.

The body of a Cestidae is composed of a gelatinous material, which is translucent and often iridescent. The surface of the body is covered with rows of cilia, known as comb rows, which are used for locomotion. These cilia beat in a coordinated fashion, propelling the animal through the water with a distinctive undulating motion.

Habitat and Distribution

Cestidae are found in warm and temperate oceans around the world. They are pelagic, meaning they live in the open ocean rather than near the sea floor. These comb jellies are often found in the upper layers of the ocean, where they can capture prey and avoid predators.

Feeding

Cestidae are carnivorous and feed on small planktonic organisms. They use their long, ribbon-like bodies to ensnare prey, which is then transported to the mouth by the action of the cilia. The diet of Cestidae typically includes small crustaceans, larvae, and other tiny marine organisms.

Reproduction

Cestidae reproduce sexually, with individuals releasing eggs and sperm into the water column. Fertilization occurs externally, and the resulting larvae develop into miniature versions of the adult form. These larvae grow and mature into fully developed Cestidae, continuing the life cycle.

Ecological Role

As predators of plankton, Cestidae play an important role in marine ecosystems. They help regulate the populations of their prey species and serve as a food source for larger predators. Their presence in the ocean contributes to the overall biodiversity and health of marine environments.

Related pages

• Ctenophora
• Tentaculata
• Plankton
• Marine biology