. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . orld-wide distribution in theMaastrichtian, but records as far back as early Campanian have been quoted. Due to the generallyfragmentary nature of the material and intraspecific variation, systematics of the genus are to recent comprehensive reviews by Kennedy (1986a, 1987 etseq.), the genus appears to bemonospecific, consisting of the type species, Diplomoceras cylindraceum (Defrance, 1816) preservation of internal moulds of the phragmocone and body chamber respectively, andsimi

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. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . orld-wide distribution in theMaastrichtian, but records as far back as early Campanian have been quoted. Due to the generallyfragmentary nature of the material and intraspecific variation, systematics of the genus are to recent comprehensive reviews by Kennedy (1986a, 1987 etseq.), the genus appears to bemonospecific, consisting of the type species, Diplomoceras cylindraceum (Defrance, 1816) preservation of internal moulds of the phragmocone and body chamber respectively, andsimilarities in suture lines suggest that the origins of Diplomoceras cylindraceum may be sought inNeoglyptoxoceras annulatum (Collignon, 1969), a species thus far known only from the lowerCampanian of Madagascar. CONTENTS PAGE Introduction 173 Systematics 175 Geographic and stratigraphic distribution 175 Origin of Diplomoceras cylindraceum 177 Acknowledgements 191 References 194 Ann. S. Afr. Mus. 110 (4), 2003: 171-198, 17 figs. 171 172 ANNALS OF THE SOUTH AFRICAN MUSEUM §^3m.

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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory