Pteronisis
Pteronisis is a genus of marine flatworms belonging to the family Pseudocerotidae. These colorful and often striking worms are characterized by their flattened bodies, which are typically elongated and oval in shape. They are commonly referred to as “flatworms,” “planarians,” or “polyclad flatworms.”
Common Names
The genus Pteronisis does not have widespread common names. They are generally referred to by their scientific name or simply as "flatworms."
Characteristics
Pteronisis species exhibit several distinctive characteristics:
- Flattened Body: Their bodies are dorsoventrally flattened, giving them a ribbon-like appearance.
- Elongated and Oval Shape: They are typically elongated and oval in shape, with a distinct head region.
- Colorful and Patterned: Many Pteronisis species are vividly colored and exhibit complex patterns, often featuring stripes, spots, or intricate designs.
- Eyespots: They possess a pair of eyespots located on the dorsal surface of their head.
- Ventral Mouth: The mouth is located ventrally and leads to a branched gastrovascular cavity.
- Hermaphroditic: Pteronisis species are hermaphroditic, possessing both male and female reproductive organs.
Environments
Pteronisis species are typically found in marine environments, particularly in shallow coastal waters and coral reefs. They are often associated with rocky substrates, seaweeds, and sponges.