Sertularella
Sertularella is a genus of colonial hydroids in the family Sertulariidae. They are commonly found in marine environments worldwide, with a diverse range of species inhabiting various coastal and deep-sea habitats. These colonial animals are characterized by their distinctive branching structures and small, polyp-like structures known as hydranths.
Common Names
Sertularella species do not have widely recognized common names, often being referred to simply by their scientific name.
Characteristics
Members of this genus are characterized by their branching, arborescent colonies that are typically small and delicate. These colonies are composed of a network of interconnected tubes, known as hydrocauli, which provide structural support. Each hydrocaulus contains a series of cup-like structures called hydrothecae, where the feeding polyps, or hydranths, reside.
Hydranths are small, polyp-like structures that extend from the hydrothecae. They possess a ring of tentacles that capture small prey, such as plankton and other microscopic organisms. The presence and shape of the hydrothecae are significant features used to differentiate between species.
Sertularella species also exhibit a characteristic reproductive cycle. The polyps produce medusae, a free-swimming stage that releases gametes for sexual reproduction. After fertilization, the resulting planula larvae settle and develop into new colonies.
Environment
Sertularella species are found in a wide range of marine environments, including:
- Coastal regions: They are common in intertidal zones, estuaries, and shallow waters.
- Deep sea: Some species inhabit the deep ocean floor, where they attach to rocks, kelp forests, and other substrates.
- Temperate and tropical waters: Sertularella species can be found in both temperate and tropical waters around the world.
References