[In this family,]the disc is small in relation to the arms, which are long, narrow and cylindrical. The aboral plates are arranged as a fine or coarse mesh, usually bearing short spines, alone or in groups. No pedicellariae. The tube feet have single ampullae.
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Henricia aspera aspera is a long-armed sea star with a coarse, meshwork of ridges on the aboral surface bearing groups of 5 to 15 small, sharp spinelets, and with large papular areas between the ridges. The body colour is yellow to brick red with a paler oral side. The five thin arms are up to 16 cm long, and the arm-to-disc ratio is from 5.3 to 7.2. The supero- and inferomarginals form an obvious double series along the arm. The intermarginals form a triangular patch in the proximal one-fifth of the arm. The oral intermediates occur proximally for three-quarters of the arm. The adambulacrals have 1 or 2 spinelets deep in the furrow with 2 to 8 coarse spinelets in a transverse zigzag or double row on the oral surface, the two nearest the furrow being the largest.
Henricia aspera aspera can be distinguished from other Henricia species by its large size, the open meshwork of ridges on the aboral surface bearing groups of small spinelets, and the small number of adambulacral spines.
Nothing is known about the biology of this species.
The Bering Sea to Santa Barbara, California, and to the Sea of Japan. Found on mud, sand, pebbles and rock at depths of 6 to 904 metres. Uncommon in this region (the area from Glacier Bay to Puget Sound to a depth to 200 metres). I have collected it on rock while scuba diving in Desolation Sound and Barkley Sound, and off Lasqueti Island and the Queen Charlotte Islands.
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2019. E-Fauna BC:
Electronic Atlas of the Fauna of British Columbia [efauna.bc.ca]. Lab
for Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
2021-04-18 7:12:48 PM]
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