Hesione
Hesione is a genus of marine polychaete worms, commonly known as Hesionid worms. These worms are typically found in marine environments worldwide, inhabiting a variety of habitats, from intertidal zones to deep sea trenches. They are characterized by their segmented bodies, parapodia (paired, fleshy appendages), and distinct head structures that often bear sensory organs.
Common Names
While the scientific name Hesione is the most commonly used, some species within the genus are known by other names. For instance, Hesione splendens is often called the "splendid Hesionid worm".
Characteristics
Hesione worms are relatively small, ranging in size from a few millimeters to several centimeters. They have elongated bodies segmented into a series of repeating units called somites. Each somite typically bears a pair of parapodia, which are paddle-like appendages used for locomotion.
One of the defining characteristics of Hesione worms is their head structure. Their heads typically have a well-developed prostomium (the first segment of the body), often bearing sensory organs like antennae, palps, and eyes. The prostomium also usually has a pair of tentacles that help the worms to sense their surroundings.
Environments
Hesione worms are found in a variety of marine environments, including:
- Intertidal zones
- Subtidal zones
- Deep-sea trenches
- Coral reefs
- Seagrass beds
They are often found living in association with other organisms, such as sponges, corals, and sea anemones. Some species are even considered commensal, meaning they benefit from living in association with another organism without harming it.
References
For more detailed information about Hesione worms, refer to the following resources: