Sea slugs often share a range of standard external features. Some sea slugs will have all these features, while others will only have one. These attributes are:
Tentacles: These long extensions are placed at the front of the head and are usually sensitive to smells and touch.
Rhinophores: These are short and horn-like extensions on the front of the head placed above tentacles if the sea slug has tentacles. The rhinophores are sensitive to smell.
Cerata: These are multiple extensions on the top of the body. Cerata are respiratory structures, and they use this as a defense.
Gills: Their gills are a feathery patch of branded structures on their bodies. The gills function in respiration and can retract.
All sea slugs have eyes that can distinguish light from dark. This visual ability means that sea slugs cannot see images. In some species, you will also see their eyes located on top of their heads. In others, the eyes are at the front of the body.
- https://a-z-animals.com/blog/incredible-sea-slug-facts/
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