Thracia
Thracia is a genus of saltwater clams, marine bivalve mollusks in the family Thraciidae. These clams are commonly known as “false angel wings” or “false angelwings” and are found in various environments, including intertidal zones and deeper waters.
Characteristics
Thracia clams are characterized by their thin, fragile shells with a distinct, elongated oval shape. The shells are typically smooth and lack ornamentation, with a slightly compressed appearance. The anterior end of the shell is rounded, while the posterior end is more pointed. The hinge line is straight and lacks teeth. The outer surface of the shell is often covered in a thin layer of periostracum, a protective organic coating.
Environments
Thracia clams are commonly found in soft sediments, such as mud, sand, and clay. They burrow into the substrate, creating a vertical burrow that extends into the sediment. These clams are filter feeders and obtain their food by drawing in water through their siphons, which are long, tube-like structures that extend above the sediment surface. Some species of Thracia are also known to live in association with other marine organisms, such as seagrass beds and sponge communities.
Distribution
Thracia clams are distributed throughout the world's oceans, with different species inhabiting various geographical regions. They can be found in both temperate and tropical waters.
References
* World Register of Marine Species* Marine Bivalve Mollusks: A Guide to the Common Species of the Pacific Coast* ScienceDirect - Thraciidae