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Stauranderasterids;

Primary Interadials and the Centrodorsal Plate

he domed central disc of  Stauranderasterids has a crown formed from six expanded ossicles.  These vary in form from bulbous, to horn-like.  The central ossicle is the centrodorsal plate, which is surrounded by a ring of five primary interadials (situated between the arms).  The madreporite slots into the base of a primary interadial.

 

    A B

1).  Very well preserved Stauranderasterids; (A) Stauranderaster squamatus ( Booth Museum, by kind permission of John Cooper); (B) Manfredaster bulbiferus ( HCCMS (Hampshire County Council Museum's Service) by kind permission of Dave Kemp, Gosport Museum).

 

A B C

2).  Primary interadials; (A) Manfredaster bulbiferus, bulbous; (B) Stauranderaster pistilliferus, conical; (C) Manfredaster cf. bulbiferus, the madreporite slots into the primary interadial ( Booth Museum, by kind permission of John Cooper).