Campanulinidae
Campanulinidae is a taxonomic family of sessile, marine cnidarians belonging to the class Hydrozoa. These small, colonial animals are often found attached to submerged surfaces such as rocks, shells, and seaweed. The individual units within a campanulinid colony, known as zooids, are typically enclosed in a protective cup-shaped structure called a hydrotheca. This hydrotheca is often campanulate, meaning bell-shaped, which gives the family its name.
Within the Campanulinidae, the zooids are specialized for different functions. Some zooids, called polyps or hydranths,
The distribution of Campanulinidae is largely cosmopolitan, found in temperate and tropical waters worldwide. Their ecological