The Variable Dorid, scientifically known as Aphelodoris brunnea, is a species of sea slug belonging to the family Dorididae. These colorful nudibranchs are easily recognized by their distinct appearance and are fascinating inhabitants of the marine world.
Description & Characteristics
Aphelodoris brunnea, commonly called the Variable Dorid, is a medium-sized nudibranch, typically reaching a maximum length of around 50 mm. Its body is characterized by a distinctive brown coloration, often exhibiting variations in shade and patterns. This variability in coloration is reflected in its common name. The dorsal surface of the Variable Dorid is covered with numerous rounded tubercles, adding to its textured appearance. Like many other nudibranchs, it possesses a pair of rhinophores, which are sensory organs located at the head, and a single pair of gills located on the posterior dorsal surface.
Habitat and Occurrence
The Variable Dorid is an inhabitant of shallow coastal waters, typically found in the intertidal zone to depths of around 20 meters. They are common inhabitants of rocky reefs and kelp forests, making them prevalent in the Neritic zone, the area of the ocean extending from the shoreline to the edge of the continental shelf. The distribution of Aphelodoris brunnea extends along the coasts of the northeastern Pacific Ocean, primarily in the western United States and Canada.
Taxonomy
Aphelodoris brunnea belongs to the family Dorididae, a large and diverse group of sea slugs. It is classified within the Order Nudibranchia, which includes a wide array of colorful and fascinating marine invertebrates. The Nudibranchia, in turn, belongs to the Class Gastropoda, a large and diverse class of mollusks that includes snails, slugs, and sea slugs.
Feeding
Aphelodoris brunnea is a food specialist, feeding exclusively on sponges. It plays an important role in marine ecosystems by consuming sponges and controlling their populations. This dietary specialization is reflected in its physical adaptations, including its radula, a tongue-like structure with rows of teeth, which are specialized for scraping sponge tissue.
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