The Black-striped Hypselodoris – Hypselodoris nigrostriata, commonly known as the Black-striped Hypselodoris, is a species of colorful sea slug belonging to the family Chromodorididae. These nudibranchs are known for their striking appearance and are a fascinating element of the marine ecosystem.
Description & Characteristics
Hypselodoris nigrostriata is a relatively small nudibranch, typically reaching a maximum size of around 20 millimeters. Its body is characterized by a vibrant white background, adorned with distinctive black stripes that run lengthwise along its mantle. These black stripes are a defining feature of this species and are what give it its common name. The gills of Hypselodoris nigrostriata are located on the dorsal side of the body, and are typically a bright orange color, adding to its vibrant appearance.
Habitat and Occurrence
The Black-striped Hypselodoris is predominantly found in the tropical waters of the Indo-Pacific region. This species thrives in a range of marine environments, with its distribution extending across the Indian Ocean and the western Pacific Ocean. It is particularly abundant in the coral reefs and rocky shores of these regions. Hypselodoris nigrostriata prefers habitats with a good amount of algae and sponges, which serve as both food sources and shelter. The typical depth range for this species is between 5 and 20 meters, making it a common sight in the shallow waters of its preferred marine zones.
Taxonomy
Hypselodoris nigrostriata is classified within the phylum Mollusca, belonging to the Class Gastropoda, Order Nudibranchia, and Family Chromodorididae. The Nudibranchia order encompasses a diverse array of sea slugs, known for their striking colors and lack of external shells. The Chromodorididae family is particularly notable for its vibrant and diverse species, many of which are highly sought-after by marine enthusiasts and photographers.
Feeding
Hypselodoris nigrostriata is primarily a sponge-feeder, relying on these sessile invertebrates as its main food source. The species exhibits a distinct preference for certain types of sponges, with its diet often consisting of encrusting sponges found within its preferred habitats. Like other nudibranchs, Hypselodoris nigrostriata is able to extract and store defensive chemicals from its diet, providing it with protection against predators. The bright coloration of Hypselodoris nigrostriata is likely a form of aposematic signaling, warning potential predators of its toxicity.
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