Thalassianthidae
Thalassianthidae is a family of colonial marine animals belonging to the order Alcyonacea, commonly known as soft corals. They are found in a wide range of habitats, from shallow coastal waters to the deep sea, with a global distribution. Thalassianthidae are characterized by their unique morphology and ecological roles in the marine ecosystem.
Common Names
Members of the Thalassianthidae family are often referred to as "sea pens" due to their resemblance to quill pens. This name is shared with other members of the Pennatulacea order, and some species within Thalassianthidae may be called "feather stars" due to their branching structure.
Characteristics
Thalassianthidae are colonial organisms, meaning they consist of many individual polyps connected by a central stalk. The polyps are typically small and have eight feathery tentacles that surround a central mouth. Unlike other soft corals, Thalassianthidae lack a distinct skeleton, relying on their flexible, fleshy structure for support. The central stalk is usually buried in the sediment, while the polyps extend upwards, creating a feather-like appearance. Some species have bioluminescent polyps, adding to their unique appearance.
Environments
Thalassianthidae are found in a variety of marine environments, including:
- Coastal waters: They are common in shallow, sandy or muddy bottoms.
- Deep sea: Some species thrive in deeper environments, often on soft substrates.
- Tropical and temperate regions: They have a global distribution, found in both warm and cold waters.