Echinostrephus
Echinostrephus is a genus of sea stars belonging to the family Ophidiasteridae. These marine invertebrates are commonly known as “spiny sea stars” and are characterized by their prominent spines, often arranged in radial rows. They are found in tropical and subtropical regions of the Indo-Pacific, typically inhabiting coral reefs and rocky shores.
Characteristics
Echinostrephus sea stars possess a distinctive five-rayed body with a central disc and radiating arms. Their most striking feature is the presence of numerous, sharp spines covering their aboral surface (the upper side of the body). These spines can vary in size and shape depending on the species. In addition to spines, they also have pedicellariae, small pincer-like structures used for defense and cleaning. The color of Echinostrephus sea stars can range from pale cream to vibrant orange, brown, or even purple.
Habitat and Ecology
Echinostrephus sea stars are primarily found in shallow, coastal waters, with a preference for coral reef environments. They are often seen amongst corals, sponges, and algae, where they feed on a variety of organisms, including invertebrates, algae, and detritus. Their diet varies depending on the specific species and their feeding habits.
Notable Species
The genus Echinostrephus includes several notable species, each with its unique characteristics and distribution. Some common examples include:
- Echinostrephus aciculatus: Known for its slender, pointed spines and a distinctive, almost "spiky" appearance. Found in the western Pacific.
- Echinostrephus mollis: Characterized by its softer, less pronounced spines and a more rounded body shape. Found in the Indo-Pacific.
- Echinostrephus diadema: Has a distinctive pattern of dark bands across its arms, along with well-developed spines. Found in the western Pacific.