Perinereis
Perinereis is a genus of marine polychaete worms belonging to the family Nereididae. These worms are commonly known as “clam worms” or “sandworms” and are widely distributed in coastal waters around the world. They are characterized by their segmented bodies, parapodia (fleshy appendages) with bristles, and a distinct head with sensory organs.
Common Names
Common names for species within the genus Perinereis include:
- Clam worms
- Sandworms
- Ragworms
Characteristics
Perinereis species share several key characteristics, including:
- Segmented bodies: Their bodies are composed of numerous segments, each with a pair of parapodia.
- Parapodia with bristles: The parapodia bear numerous bristles called setae, which aid in locomotion and burrowing.
- Distinct head: The head region is well-defined and equipped with sensory organs, including antennae, palps, and eyes.
- Prostomium: The prostomium, the first segment of the worm, is often prominent and may have a pair of sensory tentacles.
- Size: Perinereis species can range in size from a few centimeters to over 20 centimeters in length.
- Coloration: They can exhibit a variety of colors, including brown, green, and red, with some species exhibiting iridescent patterns.
Environment
Perinereis species are typically found in intertidal and subtidal environments, inhabiting a variety of habitats, including:
- Sandy beaches
- Mudflats
- Rocky shores
- Seagrass beds
- Coral reefs
They are often found burrowing in the sediment or under rocks, where they can find food and shelter.
References
World Register of Marine Species (WoRMS)
Perinereis cultrifera (Gruby, 1841) a common intertidal polychaete in India