Atrina tasmanica, commonly known as the Tasmanian fan shell, is a species of bivalve mollusc found in the coastal waters of Australia. This species is characterized by its unique fan-shaped shell, making it a captivating inhabitant of the marine environment.
Description & Characteristics
The shell of Atrina tasmanica is distinctively fan-shaped, with a delicate, translucent appearance. It can reach a maximum size of 30 cm in length, showcasing a graceful curvature. The shell surface exhibits fine radial ribs, creating a textured pattern. The color of the shell can vary from a pale cream to a light brown, often displaying iridescent hues. The interior of the shell is smooth and pearly, reflecting light beautifully.
Habitat and Occurrence
Atrina tasmanica is predominantly found in the coastal waters of Tasmania, Australia. It inhabits the intertidal zone and subtidal zone, typically residing on sandy or muddy bottoms. This species is well-adapted to the temperate waters of the region, thriving in depths ranging from the shallows to around 100 meters. This depth range places Atrina tasmanica within the neritic zone, a marine zone characterized by its proximity to the coast and its abundance of sunlight.
Taxonomy
Atrina tasmanica belongs to the Class: Bivalvia, Order: Ostreida, and Family: Pinnidae. This classification places it within a diverse group of molluscs, sharing features with other bivalve species such as oysters and mussels. The Pinnidae family, which encompasses fan shells, is distinguished by the distinctive fan-shaped shell and the ability to burrow into soft substrates.
Feeding
Atrina tasmanica is a filter feeder, relying on the water column for its sustenance. It uses its gills to filter out microscopic food particles, such as algae, plankton, and organic matter. This feeding strategy contributes to the ecological balance of the marine environment, playing a crucial role in nutrient cycling and maintaining water clarity.
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