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Project Noah Nature School
Meridiastra calcar
Brightly coloured seastars, one orange and the other blue about 70 mm wide. These had eight short arms with large aboral discs. Clearly visible on the aboral/upper surface of blue seastar is the madreporite (pic 4) which is a pale calcareous perforated disc that controls the amount of water that gets in or out of the seastar's vascular system- like a pressure equaliser.
Spotted at low tide in rock pools in the tidal zone -Port Phillip Bay.
These were amongst the rocks with a myriad other marine creatures. Also called cushion seastar.
Spotted on Nov 22, 2023
Submitted on Nov 22, 2023
1 Comment
Pretty and pretty unusually coured.