The Burrowing Fine Spine Urchin, scientifically known as Echinostrephus molaris, is a species of sea urchin belonging to the family Echinometridae. It is a relatively common and widely distributed species found in various marine habitats.
Description & Characteristics
Echinostrephus molaris is characterized by its relatively small size, with adults typically reaching a maximum diameter of around 5-7 cm. Its body is covered in numerous, fine, and tightly packed spines that give it a distinctive appearance. The spines are typically a pale grayish-brown color, although they can vary in shade depending on the individual and its environment.
The urchin also possesses a hard, calcareous test (shell) that provides protection and support. The test is typically covered in small, granular tubercles that give it a rough texture. This species, like most sea urchins, lacks a distinct head or tail, instead possessing a radial symmetry with its mouth located on the underside and its anus on the upper side.
Habitat and Occurrence
The Burrowing Fine Spine Urchin is a common inhabitant of a range of marine zones, from the lower limits of the intertidal zone to the shelf edge at depths of approximately 200 meters. This species is found in Subtidal, sublittoral, infralittoral, and deep zone of the oceans, often referred to as the neritic zone. These areas encompass a diverse array of habitats, including rocky reefs, sandy bottoms, and seagrass meadows.
The Echinostrephus molaris is known for its burrowing behavior, often excavating shallow burrows in soft sediments. This burrowing habit allows the urchin to seek refuge from predators, find food sources, and create a stable microhabitat for itself. The presence of these burrows can be a noticeable feature of the benthic environment.
Taxonomy
The species Echinostrephus molaris belongs to the Class: Echinoidea, Order: Camarodonta, and Family: Echinometridae. This classification places it within the larger group of echinoderms, which includes other well-known marine invertebrates such as starfish and sea cucumbers. The Camarodonta order encompasses a diverse group of sea urchins with distinctive characteristics, including the presence of a well-developed jaw apparatus and specific spine arrangements.
Feeding
Echinostrephus molaris is an herbivorous species, primarily feeding on a diet of algae. It uses its specialized mouthparts, known as Aristotle’s lantern, to scrape algae from surfaces and ingest it. This feeding habit plays a vital role in regulating the growth and distribution of algae in its habitat. The Burrowing Fine Spine Urchin’s diet consists mainly of algae and, to a lesser extent, detritus.
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