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 as far back 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]
| Meristodonoides Temporal range: Possible Late Jurassic records[1]
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| Teeth of Meristodonoides sp. from the Late Cretaceous of Russia | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Order: | †Hybodontiformes |
| Family: | †Hybodontidae |
| Genus: | †Meristodonoides Underwood & Cumbaa, 2010 |
| Species | |
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See text | |
Species
edit- M. butleri (Thurmond, 1971), (Aptian/Albian, Texas)[4]
- M. montanensis (Case, 1978) (Campanian, Montana and Wyoming, with similar remains from the Santonian of New Mexico[7])[4]
- M. novojerseyensis (Case and Cappetta, 2004[8]) (Maastrichtian, New Jersey)[4]
- M. rajkovichi (Case, 2001) (Cenomanian, Minnesota)[4]
- M. multiplicatus Cicimurri et al., 2014 (Santonian-Campanian, Mississippi)[4]
References
edit- ^ 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.
- ^ a b Occurrence of the Hybodont Shark Genus Meristodonoides (Chondrichthyes; Hybodontiformes) in the Cretaceous of Kansas, Michael J. Everhart
- ^ a b c d e f g Stumpf, 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. Bibcode:2024CrRes.15505779J. doi:10.1016/j.cretres.2023.105779. PMC 7615991. PMID 38799703.
- ^ "Selachians from the Upper Cretaceous (Santonian) Hosta Tongue of the Point Lookout Sandstone, central New Mexico". New Mexico Museum of Natural History & Science. 2011.
- ^ Case, G.R.; Cappetta, H. Additions to the elasmobranch fauna from the late Cretaceous of New Jersey (lower Navesink Formation, early Maastrichtian). Palaeovertebrata 2004, 33, 1–16
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