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Some bivalve marine molluscs that I've yet to ID. Possibly a species of mussel or beach pipi. This spotting has very fine radial lines that run longitudinally down the shell, whereas other species seem to have distinctive concentric growth rings around the shell. Native or foreign species unknown. NB: The third photo clearly shows plant-like filaments growing around the mouth of each mollusc. A species of 'opportunistic' algae perhaps?
This spotting was found in the ocean rock pools at North Avoca Beach in NSW, Australia. High seas had flushed these rock pools out and the water was clean and clear.
Molluscs of Australia.... http://www.mesa.edu.au/molluscs/molluscs... Australian shell classification plates.... https://bushblitz.org.au/wp-content/uplo... More shell images for NSW Coast.... https://seashellsofnsw.org.au/index.htm