Stephanometra
Stephanometra is a genus of crinoids, commonly known as feather stars, within the family Comatulidae. These are marine invertebrates that are characterized by their feathery arms and their ability to move freely across the ocean floor. They are often found in tropical and subtropical waters worldwide.
Characteristics
Stephanometra species typically have a distinctive, cup-shaped body called a calyx, which is supported by a long stalk. The calyx houses the animal's vital organs, and it is from this structure that the long, feathery arms extend. These arms are covered in cirri, small, finger-like projections that help the crinoid cling to surfaces and move about.
A key feature of Stephanometra is the presence of 10 arms, which are divided into two groups of five. This arrangement is a hallmark of the genus and helps to distinguish it from other crinoids.
Environment and Distribution
Stephanometra species are found in a variety of marine environments, including coral reefs, seagrass beds, and rocky shores. They prefer shallow, well-lit waters and are often observed in areas with strong currents. These currents help to bring them food, which they capture using their feathery arms.
The genus has a global distribution, with species found in the Atlantic, Pacific, and Indian Oceans. Some species are found in warm, tropical waters, while others are more tolerant of colder temperatures.
Notable Species
The genus Stephanometra includes a number of notable species, including:
- Stephanometra indica: Found in the Indian Ocean, this species is characterized by its long, slender arms.
- Stephanometra spinosa: This species is found in the Atlantic Ocean and has a distinctive, spiny appearance.
- Stephanometra intermedia: Found in the Indo-Pacific region, this species is known for its bright colors and its ability to change color depending on its surroundings.
References
For more information on Stephanometra, please refer to the following resources: