Original paper
On the status of Kaiparaites Matsumoto, 1955 (Cretaceous; Ammonoidea: Kossmaticeratidae)
Cooper, Michael R.
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen Band 294 Heft 3 (2019), p. 307 - 310
14 references
published: Dec 23, 2019
manuscript accepted: Nov 13, 2019
manuscript received: Oct 21, 2019
ArtNo. ESP155029403004, Price: 29.00 €
Abstract
The kossmaticeratid ammonite Kaiparaites was on its inception synonymized by its author (Matsumoto 1955) with Natalites (Collignon 1954). However, close comparison of the type species of these two genera shows them to be morphologically and stratigraphically distinct. Whereas Santonian Natalites shares the flexed constrictions of late Turonian–Coniacian Kossmaticeras, the straight constrictions of late Campanian – Maastrichtian Kaiparaites are shared with Caledonites, Gunnarites, Grossouvrites and Jacobites. Consequently, Kaiparaites is resurrected from the synonymy of Natalites and demonstrates that, under phylogenetic consideration, characters first thought to be of prime taxonomic significance actually turn out to be secondary. Since treatment of Natalites as a subgenus of Kossmaticeras emphasizes primitive characters, it is returned to generic rank, as is Santonian Karapadites although, for those who find use for subgenera, the latter can be treated as a subgenus of Natalites.
Keywords
Ammonoidea • Cretaceous • Kossmaticeratidae • phylogeny • Kaiparaites