Parasalenia
Parasalenia is a genus of sea urchins in the family Parasaleniidae. This genus, which contains the only known species, Parasalenia gratilla, is known for its distinctive morphology and is a significant component of deep-sea benthic ecosystems. Its unique features and habitat preferences make it a subject of ongoing research in marine biology.
Common Names
Parasalenia gratilla is commonly referred to as the "deep-sea sand dollar" due to its flattened, disc-like shape reminiscent of the familiar sand dollar. However, it is important to note that this species is not directly related to true sand dollars (family Clypeasteridae).
Characteristics
Parasalenia gratilla exhibits several distinctive features that differentiate it from other sea urchins. These include:
- Flattened, disc-like body: Similar to sand dollars, Parasalenia has a flattened, disc-shaped test (skeleton).
- Five-pointed symmetry: The test is divided into five symmetrical segments, a characteristic common to most echinoderms.
- Absence of spines: Unlike most sea urchins, Parasalenia lacks the prominent spines typical of the group. Instead, it has a smooth, leathery covering over its test.
- Small size: The species is relatively small, typically reaching a diameter of 2-3 centimeters.
Environment
Parasalenia gratilla is a deep-sea dweller, found at depths ranging from 1000 to 4000 meters. It prefers muddy and sandy bottoms in the abyssal zone, where it feeds on organic matter and small invertebrates.
References
For further information and detailed research on Parasalenia gratilla, consult the following resources: