Contributed by Andrew Smith, March 2012
|Distribution||Lower Cretaceous (Aptian), Alexander Island, Antarctica|
|Type||Australidiadema alexanderi Smith & Crame, 2012, p. 313 (holotype BAS KG.1681.14)|
|Species Included||Only the type species|
|Classification and/or Status||Diadematoida, Diadematidae|
|Remarks||The combination of nonverticillate spine morphology with strongly differentiated primary tubercles that become more prominent towards the ambitus and the ambulacral plating with primary and secondary tubercles alternating gives this taxon a unique appearance.
Smith, A. B. & Crame, J. A. 2012. Echinoderm faunas from the Lower Cretaceous (Aptian-Albian) of Alexander Island, Antarctica. Palaeontology 55, 305-324.