Rhynchobdellida
Rhynchobdellida is an order of leeches belonging to the class Hirudinea, characterized by their unique proboscis. This order comprises about 150 species, most of which are freshwater inhabitants, although a few are marine. Rhynchobdellids are generally smaller than other leeches and typically possess a streamlined body shape. Their proboscis, an elongated, muscular organ located in the mouth, is used for piercing prey and sucking out blood or other bodily fluids.
Common Names
Rhynchobdellids are commonly referred to as "proboscis leeches" due to their distinctive proboscis.
Characteristics
Rhynchobdellids exhibit several key characteristics, including:
- A retractable proboscis that is used for feeding.
- A streamlined body shape, often with a flattened dorsal surface.
- The absence of jaws or teeth.
- The presence of sensory papillae on the head and body.
- A wide range of color patterns, depending on the species.
Environments
Most Rhynchobdellida species are found in freshwater habitats, including lakes, ponds, streams, and rivers. However, several marine species also exist, inhabiting intertidal zones, coastal waters, and even deep-sea environments. These marine species are typically associated with specific hosts, such as fish or other marine invertebrates.
References
For further information on Rhynchobdellida, consult the following references: