Roulletia canadensis
Underwood & Cumbaa, 2010
Classification: Elasmobranchii Lamniformes Odontaspididae
Reference of the original description
Chondrichthyans from a Cenomanian (Late Cretaceous) bonebed, Saskatchewan, Canada. Palaeontology, 53(4), 903–944
Chondrichthyans from a Cenomanian (Late Cretaceous) bonebed, Saskatchewan, Canada. Palaeontology, 53(4), 903–944
Description:
Citation: Roulletia canadensis Underwood & Cumbaa, 2010: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 09/2026
Description
Original diagnosis after Underwood & Cumbaa, 2010 [12632]: Dentition of Carcharias type with three differentiated upper and three lower anterior teeth, upper intermediate teeth and lower parasymphyseal teeth. All but first upper and lower teeth somewhat asymmetrical. Ornament lacking on all teeth. Crown rather flared on labial face, overhanging top of root. Cutting edge continuous across main and lateral cusps in all teeth. Anterior teeth with steadily tapering, triangular main cusp and very small to incipient lateral cusplets not reaching base of main cusp. Root of all teeth with clearly defined lobes and welldeveloped nutritive groove. Root of anterior and first lateral teeth strongly ‘V’ shaped. Root lobes roughly parallel sided with rounded terminations and only slightly flattened basal face. Lateral teeth all have main cusp inclined to posterior, in teeth posterior of second lateral position main cusp strongly curved. One pair of lateral cusplets sometimes with incipient outer pair present but short and triangular. Root lobes in lateral teeth with wide and flat basal face giving ‘swollen’ profile to posterior root lobe.
Original diagnosis after Underwood & Cumbaa, 2010 [12632]: Dentition of Carcharias type with three differentiated upper and three lower anterior teeth, upper intermediate teeth and lower parasymphyseal teeth. All but first upper and lower teeth somewhat asymmetrical. Ornament lacking on all teeth. Crown rather flared on labial face, overhanging top of root. Cutting edge continuous across main and lateral cusps in all teeth. Anterior teeth with steadily tapering, triangular main cusp and very small to incipient lateral cusplets not reaching base of main cusp. Root of all teeth with clearly defined lobes and welldeveloped nutritive groove. Root of anterior and first lateral teeth strongly ‘V’ shaped. Root lobes roughly parallel sided with rounded terminations and only slightly flattened basal face. Lateral teeth all have main cusp inclined to posterior, in teeth posterior of second lateral position main cusp strongly curved. One pair of lateral cusplets sometimes with incipient outer pair present but short and triangular. Root lobes in lateral teeth with wide and flat basal face giving ‘swollen’ profile to posterior root lobe.
Remarks
shark-references Species-ID=10843;
shark-references Species-ID=10843;
References
Climate cooling and clade competition likely drove the decline of lamniform sharks. Proceedings of the National Academy of Sciences of the United States of America, 116(41), 20584–20590
DOI: 10.1073/pnas.1902693116
Chondrichthyans from a Cenomanian (Late Cretaceous) bonebed, Saskatchewan, Canada. Palaeontology, 53(4), 903–944
DOI: 10.1111/j.1475-4983.2010.00969.x
Mid-Cenomanian vertebrate faunas of the WesternInterior Seaway of North America and their evolutionary, paleobiogeographical, and paleoecological implications. Palaeogeography, Palaeoclimatology, Palaeoecology, 295(1–2), 199–214
DOI: 10.1016/j.palaeo.2010.05.038
Climate cooling and clade competition likely drove the decline of lamniform sharks. Proceedings of the National Academy of Sciences of the United States of America, 116(41), 20584–20590
DOI: 10.1073/pnas.1902693116
Chondrichthyans from a Cenomanian (Late Cretaceous) bonebed, Saskatchewan, Canada. Palaeontology, 53(4), 903–944
DOI: 10.1111/j.1475-4983.2010.00969.x
Mid-Cenomanian vertebrate faunas of the WesternInterior Seaway of North America and their evolutionary, paleobiogeographical, and paleoecological implications. Palaeogeography, Palaeoclimatology, Palaeoecology, 295(1–2), 199–214
DOI: 10.1016/j.palaeo.2010.05.038
