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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.

 

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.

 

A B

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.

 

4).  Side view of the arm (x3.0).  Image  2005 The Natural History Museum, by kind permission.