Trapania dalva is a species of sea slug, a nudibranch, a marine gastropod mollusc in the family Goniodorididae. It was first described in 2013 by Luisa Carmona, José Templado, and Ángel Valdés. This captivating nudibranch, often referred to by its common name, is characterized by its distinctive appearance and its fascinating ecological role in the marine environment.
Description & Characteristics
Trapania dalva is a relatively small nudibranch, typically reaching a maximum size of 15 millimeters in length. The body is elongated and slender, with a characteristically pointed head and tail. One of the most notable features of this species is its bright orange-red coloration, often accented with white or cream-colored markings. The rhinophores, or sensory organs on the head, are long and slender, while the cerata, the finger-like projections along the back, are short and club-shaped. The cerata are particularly striking due to their bright orange coloration, which is often interspersed with white or cream-colored tips, creating a vibrant and eye-catching appearance.
Habitat and Occurrence
Trapania dalva is known to inhabit the shallow waters of the Mediterranean Sea. It is particularly common in the western Mediterranean, where it has been observed in the waters of Spain, Italy, and France. This species is typically found in rocky areas with a moderate amount of algae and other invertebrates. Its preferred depth range is typically between 5 and 20 meters, placing it within the mesophotic zone. This zone, characterized by reduced light levels, presents a unique habitat for this nudibranch, along with other marine organisms adapted to these conditions.
Taxonomy
Trapania dalva is classified as a member of the Class Gastropoda, the largest and most diverse class of molluscs. It belongs to the Order Nudibranchia, a group of gastropods that lack a shell in their adult stage, and the Family Goniodorididae, a family of nudibranchs characterized by their generally elongated bodies and often bright coloration. The scientific classification reflects its evolutionary history and relationships with other marine organisms.
Feeding
Trapania dalva is a carnivorous nudibranch that feeds primarily on bryozoans, small colonial animals that are often found growing on rocks and other surfaces in the marine environment. The nudibranch uses its radula, a toothed ribbon-like structure in its mouth, to scrape and ingest the bryozoans. This specialized feeding behavior plays an important role in the marine ecosystem, helping to control the populations of bryozoans and maintain the delicate balance of the community.
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