Hadranderaster abbreviatus |
A very scarce form from the White Chalk, whose ossicles are best recognised by their circular rather than blocky profile. Some of the ossicles of the arm tips possess a flattened circular area; this is slightly raised and located centrally on the outer surface of the ossicle. The marginals are almost indistinguishable from the ossicles of the aboral surface.
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1). Aboral view of the type specimen, preserving two arms and a portion of the disc; x1.6; Bromley, Kent, BMNH (British Museum (Natural History) London) 57538). Image © 2005 The Natural History Museum, by kind permission.
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2). Details of the type specimen; (A) Typical ossicles displaying the rounded profile and the variably present flattened circular areas (x9.0); (B) Aboral view of the arm-tip (x4.0). Images © 2005 The Natural History Museum, by kind permission.
3). Detail of the type specimen (x4.0); lateral (side) view of the arm-tip; the marginals are almost indistinguishable from the ossicles of the aboral surface. Image © 2005 The Natural History Museum, by kind permission.
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4). Side view of the arm (x3.0). Image © 2005 The Natural History Museum, by kind permission.