Teeth of Meristodonoides sp. from the Late Cretaceous of Russia
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Class:
Chondrichthyes
Subclass:
Elasmobranchii
Order:
†Hybodontiformes
Family:
†Hybodontidae
Genus:
†Meristodonoides Underwood & Cumbaa, 2010
Species
See text
Meristodonoides is an extinct genus of hybodont. The type species is M. rajkovichi, which was originally a species in the genus Hybodus. The species, along with other Hybodus species such as H. butleri and H. montanensis, was reassigned to Meristodonoides by Charlie J. Underwood and Stephen L. Cumbaa in 2010.[2][3] The species is primarily known from remains from the Cretaceous of North America, spanning from the Aptian/Albian to Maastrichtian, making it one of the last surviving hybodont genera, though records of the genus likely extend back as far as the Late Jurassic, based on an undescribed skeleton from the Tithonian of England, and fragmentary teeth from the Kimmeridgian of Poland, England and Switzerland.[4] Other remains of the genus are known from the Coniacian of England, the Aptian-Albian of France,[5] and the Campanian of European Russia.[6] The morphology of the teeth suggests an adaptation to tearing prey.[4] Fossils from the Western Interior Seaway suggest that it preferred nearshore marine environments, being absent from deeper-water areas, with it likely also being able to tolerate brackish and freshwater conditions.[3]
^Stumpf, S.; Meng, S.; Kriwet, J. (2022). "Diversity Patterns of Late Jurassic Chondrichthyans: New Insights from a Historically Collected Hybodontiform Tooth Assemblage from Poland". Diversity. 14 (2). 85. doi:10.3390/d14020085.
^Underwood, Charlie J.; Cumbaa, Stephen L. (2010). "Chondrichthyans from a Cenomanian (Late Cretaceous) bonebed, Saskatchewan, Canada". Palaeontology. 53 (4): 903–944. Bibcode:2010Palgy..53..903U. doi:10.1111/j.1475-4983.2010.00969.x.
^ abOccurrence of the Hybodont Shark Genus Meristodonoides (Chondrichthyes; Hybodontiformes) in the Cretaceous of Kansas, Michael J. Everhart
^ abStumpf, Sebastian; Meng, Stefan; Kriwet, Jürgen (2022-01-26). "Diversity Patterns of Late Jurassic Chondrichthyans: New Insights from a Historically Collected Hybodontiform Tooth Assemblage from Poland". Diversity. 14 (2): 85. doi:10.3390/d14020085. ISSN 1424-2818.
^Guinot, Guillaume; Underwood, Charlie J.; Cappetta, Henri; Ward, David J. (August 2013). "Sharks (Elasmobranchii: Euselachii) from the Late Cretaceous of France and the UK". Journal of Systematic Palaeontology. 11 (6): 589–671. Bibcode:2013JSPal..11..589G. doi:10.1080/14772019.2013.767286. ISSN 1477-2019. S2CID 84892884.
^Jambura, Patrick L.; Solonin, Sergey V.; Cooper, Samuel L.A.; Mychko, Eduard V.; Arkhangelsky, Maxim S.; Türtscher, Julia; Amadori, Manuel; Stumpf, Sebastian; Vodorezov, Alexey V.; Kriwet, Jürgen (March 2024). "Fossil marine vertebrates (Chondrichthyes, Actinopterygii, Reptilia) from the Upper Cretaceous of Akkermanovka (Orenburg Oblast, Southern Urals, Russia)". Cretaceous Research. 155: 105779. doi:10.1016/j.cretres.2023.105779. PMC 7615991.
Meristodonoides is an extinct genus of hybodont. The type species is M. rajkovichi, which was originally a species in the genus Hybodus. The species,...
to only a handful of species, including members of Lonchidion, and Meristodonoides. The last hybodonts disappeared, seemingly abruptly, as part of the...
earlier genus of Lissodus. †Meristodonoides †M. montanensis Aptian–Maastrichtian Montana and Wyoming, USA Meristodonoides montanensis was one of the latest...
microcuspidatus (a carpet shark) Ischyrhiza mira (a sclerorhynchid) Meristodonoides montanensis (a shark) Myledaphus bipartitus (a ray) Protoplatyrhina...
butleri, H. rajkovichi, and H. montanensis, were later reassigned to Meristodonoides. H. basanus and H. fraasi are now included in the genus Egertonodus...
Chattian to Aquitanian) United States A relative of the megamouth shark. Meristodonoides multiplicatus Sp. nov Valid Cicimurri, Ciampaglio & Runyon Late Cretaceous...
et al. Oxfordian Qigu Formation China A lonchidiid hybodontiform. Meristodonoides Valid Underwood Cumbaa Aptian to Maastrichtian Canada USA A new genus...
well as whole coprolites, are abundant. Hybodont shark (primarily Meristodonoides), ganoid-scaled and teleost fish, and invertebrate fossil ammonoids...