Pseudechinus
Pseudechinus is a genus of sea urchins in the family Echinometridae. It is a genus of small, usually dark colored urchins commonly found in the intertidal and shallow subtidal regions of the Indo-Pacific region. These urchins are known for their relatively flat, disc-shaped test (shell) and short spines.
Common Names
Common names for Pseudechinus species include:
- Flat sea urchin
- Pancake urchin
- Keyhole urchin
Characteristics
Pseudechinus sea urchins share a number of characteristics, including:
- Test (Shell): Relatively flat, disc-shaped test with a diameter typically ranging from 2 to 5 cm. The test is usually covered in short, blunt spines.
- Spines: Short, blunt, and often dark in color. The spines can be quite variable in size and shape between different species.
- Tube Feet: Numerous tube feet are present on the oral (bottom) surface of the test, used for locomotion and feeding.
- Mouth: Located on the oral surface, surrounded by a ring of five teeth.
- Anus: Located on the aboral (top) surface, usually near the center of the test.
Environments
Pseudechinus species are primarily found in the intertidal and shallow subtidal zones of the Indo-Pacific region. They prefer rocky or coral reef environments and are often found amongst algae and seaweed.
References
For more information, refer to the following reliable references: