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Lesser Starlet Coral Video Stock Footage

Siderastrea radians is either encrusting or grows in small, dimpled hummocks up to 30 centimetres (12 in) across but most colonies are much smaller than this. Occasionally it occurs as small calcareous pebbles that roll around in seagrass meadows or as loose flat discs in shallow rocky places. The corallites are not circular but are triangular or four-sided and deep, with 30 to 40 small ridges called septa. They have a dark interior that contrasts in colour with the pale surface of the coral which is greyish, greenish or light brown. The polyps are retracted back into these corallites during the day but emerge at night, extending their tentacles to feed. Each of these has a small knob of stinging cnidocytes at its tip. The lesser starlet coral can be confused with the closely related massive starlet coral (Siderastrea siderea) but that usually grows at greater depths, is larger and has less deep, more rounded corallites, each with 50 to 60 septa. Learn more about Lesser Starlet Coral


View related species in family group: Coral and Sea Whip

Animalia: Cnidaria: Scleractinia: Anthozoa: Siderastreidae: Siderastrea radians

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