Parvulastra calcarata is a species of starfish belonging to the family Asterinidae. It is a small, distinctive starfish found in various marine environments. This species has a unique appearance and plays an important role in the ecosystem, contributing to the balance of marine life.
Description & Characteristics
Parvulastra calcarata is characterized by its small size, typically reaching a maximum diameter of 20 mm. The body is pentagonal in shape with five arms, often exhibiting a slight tapering towards the tips. The dorsal surface is typically covered in small, rounded granules, giving it a slightly rough texture. The color of this starfish can vary considerably, ranging from pale yellow to reddish-brown, sometimes displaying a mottled appearance. The ventral surface of Parvulastra calcarata features a mouth at the center and a distinct pattern of ambulacral grooves along each arm, which are used for locomotion.
Habitat and Occurrence
Parvulastra calcarata typically inhabits intertidal and subtidal zones, frequently residing on rocky substrata and seaweed. This species is commonly found in the infralittoral zone, which is the area of the ocean floor that is periodically exposed during low tide. The distribution of Parvulastra calcarata extends across various regions, with populations reported from the North Atlantic Ocean, including locations in the United Kingdom, Ireland, and the North Sea.
Taxonomy
Parvulastra calcarata belongs to the Class: Asteroidea, which encompasses all starfish, and the Order: Valvatida, known for their distinctive five-armed body plan and often colorful appearances. The starfish is classified within the Family: Asterinidae, a family that includes several other species of small, often brightly colored starfish, known for their preference for rocky habitats.
Feeding
Parvulastra calcarata is a carnivorous species, primarily feeding on a variety of small invertebrates, including polychaete worms, crustaceans, and other small marine animals. The starfish employs a unique feeding strategy by extending its stomach out of its mouth to envelop its prey. The digestive enzymes break down the food, allowing the starfish to absorb nutrients effectively.
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