Tetraclitidae
Tetraclitidae is a family of barnacles in the order Sessilia. They are characterized by their conical or pyramidal shape and their ability to adhere to hard surfaces. These barnacles are commonly found in marine environments, particularly in intertidal and subtidal zones, and are often associated with rocky shores and other hard substrates.
Common Names
Tetraclitidae are often referred to as "acorn barnacles" or "rock barnacles."
Characteristics
Members of this family possess several defining characteristics that distinguish them from other barnacles:
- Conical or Pyramidal Shape: Tetraclitidae are typically cone-shaped or pyramidal, with a distinct base that attaches to the substrate.
- Four Plates: They have four movable plates, known as "terga" and "scuta," that open and close to allow for feeding and water circulation.
- Adhesive Base: Tetraclitidae have a strong adhesive base, often composed of a cement-like substance, that firmly attaches them to rocks, shells, and other hard surfaces.
- Cirri: Like other barnacles, they possess six pairs of feathery appendages called "cirri" that filter food particles from the water.
- Sessile Lifestyle: Tetraclitidae are sessile organisms, meaning they are permanently attached to a substrate and cannot move independently.
Environments
Tetraclitidae are commonly found in a variety of marine environments, including:
- Intertidal Zones: They thrive in areas that are exposed to air during low tide and submerged during high tide.
- Subtidal Zones: They can also be found in deeper waters, below the low tide mark.
- Rocky Shores: Tetraclitidae are frequently observed on rocky shorelines and cliffs.
- Other Hard Substrates: They can also attach to shells, ship hulls, and other man-made structures.
References
For further information on Tetraclitidae, consult the following resources: