title: suture line patterns in Olcostephanidae and Spiticeratidae, ammonites of the upper Jurassic-Lower Cretaceous: systematic considerations
abstract: The systematic classification of the ammonites in the family Olcostephanidae here proposed is in according to different sutural line patterns. The saddle S1 is bifurcated in the Family Spiticeratidae Spath, 1924, and trifurcated in the Family Olcostephanidae Haug, 1910. New taxa are proposed based on the suture line and their ornamentation, Groebericeratinae n. subfam., Saynoceratinae n. subfam., Garcitinae n. subfam., Kurdistanites n. gen., Peruvites n. gen., Spiticeras (Djanelidzeites) n. subg
journal: Paleontología mexicana.