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Leptasterias hexactis is a species of starfish in the family Asteriidae, commonly known as the six-rayed star. It is found in the intertidal zone of the western seaboard of the United States. It is a predator and is unusual among starfish in that it broods its eggs and young.
Like other starfish in the family Asteriidae, Marthasterias glacialis is a predator and feeds mostly on bivalve molluscs and other invertebrates. [6] It has been found that secondary metabolites known as saponins , found within the starfish's tissues, have a dramatic effect on the whelk Buccinum undatum .
Aboral surface of an Asterias forbesi sea star showing ring of pedicellariae surrounding spine. Asterias, like most starfish genera in the order Forcipulatida, are recognisable externally by their pedicellariae, many thousands of tiny jaw-like structures on the skin which can snap shut to nip at prey or predators.
Leptasterias muelleri, the northern starfish, is a species of starfish in the family Asteriidae. [1] It is found in the Arctic Ocean and the northern Atlantic Ocean . It is a predator and scavenger and is unusual among starfish in that it broods its young.
A study was performed to model individual growth and explore the relationship of changes in local abundance with variation in environmental factors and the reproductive status of individuals. [1] They studied the relationship between male and female organ wet weights with seawater temperature, salinity, monthly mean precipitation, and day-length.
Stylasterias is a genus of starfish in the family Asteriidae. Stylasterias forreri , the velcro star , is the only species in the genus. It is found on the Pacific coast of Canada and the United States.
Sladen, 1889 [1] Solaster paxillatus , the orange sun star , is a species of starfish found at varying depths in the northern Pacific Ocean. It is a natural predator of the starfish Asterias amurensis .
Test starfish were placed in the downstream odour plume, one metre (3 ft 3 in) away from the food source and the movements of each starfish were recorded on videotape. A control was provided using the same flow conditions but without an odour being present. 12 of the test starfish (20%) moved towards the target and got within 15 cm (6 in) of it ...