Xenostephanus (mammal)
''Xenostephanus'' may refer to: * preoccupied synonym (1963) of '' Zenostephanus'', an ammonite genus * ''Xenostephanus'' (mammal) (1962), a genus of notoungulates in the family Oldfieldthomasiidae Oldfieldthomasiidae is an extinct family of notoungulate mammals known from the Late Paleocene to Late Eocene of South America. The family was classified by George Gaylord Simpson in 1945 and a synonym is Acoelodidae, defined by Florentino Ameghi ...

Zenostephanus
''Zenostephanus'' is true ammonite genus from the lower part of the Upper Jurassic of eastern England and Scotland belonging to the ammonitid family, Perisphinctidae. ''Zenostephanus'' is revised from ''Xenostephanus'', a preoccupied name for a new genus of toxodont notoungulate from Argentina. The type is ''Aulacostephanus ranbyensis'' ''References'' * Perisphinctidae ''in the'' Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ..., Part L, Mollusca 4. Ammonitida genera Perisphinctidae {{Ammonitina-stub ...
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Xenostephanus (mammal)
''Xenostephanus'' may refer to: * preoccupied synonym (1963) of '' Zenostephanus'', an ammonite genus * ''Xenostephanus'' (mammal) (1962), a genus of notoungulates in the family Oldfieldthomasiidae Oldfieldthomasiidae is an extinct family of notoungulate mammals known from the Late Paleocene to Late Eocene of South America. The family was classified by George Gaylord Simpson in 1945 and a synonym is Acoelodidae, defined by Florentino Ameghi ...