Pleurobranchida

Characteristics

Pleurobranchids have a number of defining characteristics that separate them from other sea slugs:

• Flattened, oval-shaped body: Pleurobranchids are typically flattened, oval-shaped creatures with a broad foot that allows them to crawl over surfaces. They lack prominent rhinophores (sensory organs) that are characteristic of nudibranchs.
• Prominent gills: Pleurobranchids have large, feathery gills located on the right side of their mantle. These gills are used for respiration and can be retracted into a cavity when threatened.
• Reduced shell: Most pleurobranchids have a reduced internal shell, which is often covered by the mantle. This shell provides some protection, but it is not as substantial as the shells of other gastropod molluscs.
• Lack of prominent rhinophores: Unlike nudibranchs, pleurobranchids lack prominent rhinophores (sensory organs) on their heads.
• Carnivorous diet: Pleurobranchids are carnivorous and feed on a variety of invertebrates, including sponges, hydroids, and other sea slugs. They have a radula, a ribbon-like structure with teeth, which they use to scrape food off surfaces.

Environments

Pleurobranchids are found in a variety of marine environments around the world, typically in shallow waters. They are most commonly found in tropical and subtropical regions, but some species can also be found in colder waters. Pleurobranchids can be found in a variety of habitats, including rocky shores, coral reefs, and seagrass meadows. They often live in crevices and under rocks, where they can find food and shelter from predators.

References

For more detailed information on Pleurobranchida, please consult the following reliable sources:

• World Register of Marine Species (WoRMS)
• ResearchGate
• Wikipedia