Journal
HISTORICAL BIOLOGY
Volume 25, Issue 2, Pages 183-192Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/08912963.2012.714658
Keywords
enamel microstructure; HunterSchreger bands; schmelzmuster; Arsinoitherium; Palaeoamasia; Phenvcolophus
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The enamel microstructure in molars of Arsinoitherium is reinvestigated and a new modification of radial enamel (RE), arsinoitheriid radial enamel (ARE)', is defined. It is characterised by alternating stripes with different organisation of the interprismatic matrix but no prism decussation. Recognition of this new subtype leads to a reinterpretation of structure previously identified as modified radial enamel and of HunterSchreger bands in Arsinoitherium. The newly differentiated ARE of Arsinoitherium is more derived in relation to corresponding microstructures of Palaeoamasia and Crivadiatherium. A careful reinvestigation of RE in other Paenungulata will be required to provide additional data bearing on phylogenetic reconstruction. The enamel of Phenacolophus argues against inclusion of this genus in the Embrithopoda.
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