They are characterized by shells in which the whorls bear growth lines or lamellar folds, or both, commonly corresponding to constrictions in the internal mold. The external suture, that not lying against the previous whorl, has two lateral lobes (per side), the first being much larger. The internal lobe, which lies against the previous whorl, has a cruciform dorsal lobe.
lytoceratinae, subfamily, ammonoid, cephalopods, that, make, part, family, lytoceratidae, temporal, range, pliensbachian, cenomanian, preꞒ, fossil, shells, protetragonites, obliquestrangulatum, from, alpes, haute, provence, display, galerie, paléontologie, ana. Lytoceratinae is a subfamily of ammonoid cephalopods that make up part of the family Lytoceratidae LytoceratinaeTemporal range Pliensbachian Cenomanian PreꞒ Ꞓ O S D C P T J K Pg N Fossil shells of Protetragonites obliquestrangulatum from Alpes de Haute Provence on display at Galerie de paleontologie et d anatomie comparee in Paris Scientific classification Domain Eukaryota Kingdom Animalia Phylum Mollusca Class Cephalopoda Subclass Ammonoidea Order Ammonitida Family Lytoceratidae Subfamily LytoceratinaeNeumayr 1875 Genera 1 Ammonoceratites Bowditch 1822 Argonauticeras Anderson 1938 Carinolytoceras Wiedmann 1962 Eulytoceras Spath 1927 Hemilytoceras Spath 1927 Lytoceras Suess 1865 Metalytoceras Spath 1927 Pictetia Uhlig 1883 Protetragonites Hyatt 1900 Pterolytoceras Spath 1927 PtycholytocerasDescription editThey are characterized by shells in which the whorls bear growth lines or lamellar folds or both commonly corresponding to constrictions in the internal mold The external suture that not lying against the previous whorl has two lateral lobes per side the first being much larger The internal lobe which lies against the previous whorl has a cruciform dorsal lobe Fossil range editLytoceratinae has a long stratigraphic and temporal range 196 5 to 89 3 Ma 1 extending from the Early Jurassic Pliensbachian to the Late Cretaceous Cenomanian although most included genera have much shorter ranges Lytoceras the type genus ranges from Early Jurassic to early late Cretaceous 2 Ptycholytoceras is confined to the Early Jurassic Toarcian while Hemilytoceras is present in the Late Jurassic Oxfordian Tithonian 2 Five genera are known from the Early Cretaceous Pterolytoceras and Metalytoceras from the Valanginian Petrolytoceras may extend back to the Tithonian Eulytoceras from the Hauterivian Barremian Argonauticeras and Pictetia from the Aptian Albian Ammonoceratites ranges from the Aptian to the Cenomanian 2 References edit a b The Paleobiology Database a b c Sepkoski Jack Sepkoski s Online Genus Database Cephalopoda W J Arkell B Kummel amp C W Wright 1957 Mesozoic Ammonoidea Treatise on Invertebrate Paleontology Part L Ammonoidea R C Moore ed nbsp This Ammonitida related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Lytoceratinae amp oldid 1165999421, wikipedia, wiki, book, books, library,
