The Humped Ancula, Pacific Ancula, Pacific Ancula Sea Slug, Atlantic Ancula, scientifically known as Ancula gibbosa, is a species of colorful sea slug belonging to the family Goniodorididae. This nudibranch is a small, but vibrant creature that plays a vital role in the marine ecosystems it calls home.
Description & Characteristics
Ancula gibbosa is a relatively small sea slug, with adults reaching a maximum size of about 15 millimeters. It is characterized by its distinctive humped back and bright orange or reddish-orange body. The hump is prominent and rounded, giving the slug a distinctive shape. The mantle of Ancula gibbosa is often covered in small, white spots, which contribute to its overall vibrant appearance.
Habitat and Occurrence
The Humped Ancula, Pacific Ancula, Pacific Ancula Sea Slug, Atlantic Ancula, Ancula gibbosa, thrives in a variety of coastal habitats. It is commonly found in the intertidal zone, where it can be exposed to air during low tides. Ancula gibbosa also inhabits shallow water kelp forests and rocky reefs, often preferring areas with abundant algae growth. This sea slug is adapted to life in seawater, and its presence indicates healthy coastal environments.
Taxonomy
The species Ancula gibbosa belongs to the Class: Gastropoda, Order: Nudibranchia, and Family: Goniodorididae. This classification places it among the diverse group of sea slugs that lack external shells and exhibit striking colors and patterns.
Distribution and Occurrence
The Humped Ancula, Pacific Ancula, Pacific Ancula Sea Slug, Atlantic Ancula, Ancula gibbosa, is widely distributed in coastal waters around the world. Its range extends from the northeastern Atlantic Ocean to the Mediterranean Sea and the Pacific Ocean. This species is particularly common in the intertidal zone and in shallow, rocky reefs, making it a prevalent presence in these aquatic ecosystems.
Feeding
Ancula gibbosa is a specialist feeder, primarily consuming a specific type of marine invertebrate known as Kelchwürmer (Entroprocta). These small, colonial animals are often found attached to algae and rocks, providing a readily available food source for Ancula gibbosa. In addition to Kelchwürmer, this sea slug may also feed on sea squirts, which are filter-feeding invertebrates. Ancula gibbosa plays an important role in the food web by keeping populations of its prey in check.
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