Gorgonocephalus arcticus

Technological advances have made it possible for scientists to view the basket starr in situ via remotely operated vehicles (ROVs).

[4] Basket stars move along the bottom of the ocean, and G. arcticus commonly lives in areas of moderate to strong current flow.

[4] G. arcticus have been observed living on the exterior of Boltenia ovifera, a species of tunicates found in a similar range of the Arctic to Cape Cod.

[7] They can react to water-borne chemicals, changing lighting, currents and vibrations or physical contact.

The mouth on the lower surface of the disc is framed by five jaws bearing spinelink teeth and papillae.

[7] Gorgonocephalus arcticus move by strong arm strokes that lift the disk and thrust them forward.

[3] Gorgonocephalus arcticus is a suspension feeder and feeds by extending its arms vertically into the water column in search of food.

[4] The upper extensions of the arms are more flexible than the lower parts of the extremities so they are more effective at ensnaring prey.

[4] Tube feet along with girdle hooks and spines are used to move the captured particles towards the oral surface.

[4] The girdle hooks are made of calcite and in reality are curved ossicles attached by ligaments to a boss suggesting that they are spines adapted to restrain prey items.

[4] The entire length of the arm is covered in lateral spines that increase in size and number from the tip towards the base.

Gorgonocephalus arcticus with arms curled inward and disk visible against a black background.
Close up of the disk of G. arcticus
Gorgonocephalus arcticus on a rock
Gorgonocephalus arcticus off St Francis, Newfoundland, Canada.