Selachians from the Niobrara Formation of the Upper Cretaceous (Coniacian) of Carrot River, Saskatchewan, Canada

Case, Gerard R.; Tokaryk, Tim T.; Baird, Donald J.

doi:10.1139/e90-112

Cited by 32 publications

(36 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Those ConiacianCampanian I. mantelli teeth are all without lateral cusps (cf. [1,13,28,50,51,[61][62][63][64][65][66]), which allow to separate I. appendiculatus, I. denticulatus from I. mantelli only on complete tooth sets.…”

Section: Lateralmentioning

confidence: 99%

Skeleton of the Fossil SharkIsurus denticulatusfrom the Turonian (Late Cretaceous) of Germany—Ecological Coevolution with Prey of Mackerel Sharks

Diedrich¹

2014

Paleontology Journal

View full text Add to dashboard Cite

AnIsurus denticulatus(Glickman, 1957) shark skeleton from the late Turonian (Late Cretaceous) of Germany is described within a diverse upwelling influenced fish fauna of northern Germany, Europe. It was found in the turbiditic marly limestones at the submarine Northwestphalian Lippe Swell in the southern Proto-North Sea Basin. Compared to modern mackerel sharkIsurus oxyrinchusRafinesque, 1809, including cranial denticles, this allows a revision of the younger synonym “CretoxyrhinaGlickman, 1964”. Within the CretaceousIsurus, a loss of the lateral tooth cusps and nutritive clefts of the roots (considered as plesiomorphic character of the Lamnidae) took place from the Albian (Early Cretaceous) to the Campanian (Late Cretaceous). The tooth morphology changed during the Albian-Turonian from a tearing (I. denticulatus) to a cutting (I. mantelli) type (Coniacian-Campanian). The complete lateral cusplet and symphyseal teeth reduction inIsurusat the end of the Cretaceous seem to be a result of the coevolutionary changing feeding habits of a worldwide expanding shark. In a second evolutionary adaptation, parallel to the new radiation of marine mammals (Paleocene/early Eocene), fromIsurus, the white shark ancestors (Carcharodon) seem to originate. In another radiation fromIsurus, coevolving with appearance of dolphins and further marine mammal evolution within the Middle Miocene, a second timeIsurusdeveloped serrated teeth (I. escheri).

show abstract

Section: Lateralmentioning

confidence: 99%

Skeleton of the Fossil SharkIsurus denticulatusfrom the Turonian (Late Cretaceous) of Germany—Ecological Coevolution with Prey of Mackerel Sharks

Diedrich¹

2014

Paleontology Journal

View full text Add to dashboard Cite

show abstract

“…E. paucicorrugata sp. nov. teeth differ from those of ‘ Odontaspis ’ saskatchewanensis Case et al . 1990 (which is probably conspecific with Carcharias sp.…”

mentioning

confidence: 97%

“…Subsequent descriptions of Squalicorax from the northern part of the Western Interior Seaway have recognized two morphotypes, and have either included all in S. falcatus Agassiz, 1843 (e.g. Case et al. 1990) or have separated them into S. falcatus and S. curvatus (e.g.…”

mentioning

confidence: 99%

“…Shimada 2008). The smaller parasymphyseal teeth may easily be mistaken for teeth of co‐occurring Cretomanta canadensis Case et al. , 1990, but may be separated from them by, amongst other things, a less erect cusp and presence of a cutting edge.…”

mentioning

confidence: 99%

“…Despite the poor quality of figures of some specimens referred to this species (e.g. Case et al. 1990; Cicimurri 2001 a , 2004), teeth appear to be widespread within the Western Interior Seaway, and range from Upper Albian to at least Coniacian (Everhart 2007).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Chondrichthyans from a Cenomanian (Late Cretaceous) bonebed, Saskatchewan, Canada

Underwood

Cumbaa

2010

Palaeontology

View full text Add to dashboard Cite

Acid preparation of samples of a bonebed from the Cenomanian of central Canada yielded several thousand well-preserved chondrichthyan teeth, in addition to numerous other vertebrate remains. Teeth and other remains of one species of chimaeroid, one species of hybodont shark, three species of Ptychodus, 10 species of neoselachian sharks and two species of batoid were recorded. The family Archaeolamnidae fam. nov., genera Meristodonoides gen. nov. and Telodontaspis gen. nov. and species Ptychodus rhombodus sp. nov., Telodontaspis agassizensis gen et sp. nov., Eostriatolamia paucicorrugata sp. nov., Roulletia canadensis sp. nov., Cretorectolobus robustus sp. nov. and Orectoloboides angulatus sp. nov. are described. Status of the genus Palaeoanacorax and the species Cretoxyrhina denticulata, Squalicorax curvatus and 'Rhinobatos' incertus are discussed, and reconstructed dentitions of Archaeolamna and Roulletia presented. The fauna is of low diversity and dominated by active hunters, with many species apparently endemic to the northern Western Interior Seaway.

show abstract

Marine vertebrates from the Hartland Shale (Upper Cretaceous: Upper Cenomanian) in southeastern Colorado, USA

Nagrodski

Shimada

Schumacher

2012

Cretaceous Research

View full text Add to dashboard Cite

The Hartland Shale Member of the Greenhorn Limestone was deposited in the middle of the Late Cretaceous Western Interior Seaway of North America. Rock samples rich in micro-vertebrate fossils were collected from the lower part of the Hartland Shale (ca. 94.6 Ma: early Late Cenomanian) in southeastern Colorado, USA. Through acid treatment of the rock samples, 25 marine vertebrate taxa are identified including chondrichthyans, osteichthyans, and a reptile. Chondrichthyans are represented by seven species: Ptychodus anonymus, Squalicorax curvatus, Carcharias saskatchewanensis, Archaeolamna kopingensis, Cretoxyrhina mantelli, Cretomanta canadensis, and Rhinobatos incertus. Osteichthyan fishes consist of 17 taxa: Micropycnodon kansasensis, cf. Palaeobalistum sp., Caturidae indet., Protosphyraena sp., Plethodidae indet., Elopopsis sp., Pachyrhizodus minimus, cf. Pachyrhizodus sp., Albulidae indet., Cimolichthys nepaholica, Enchodus cf. E. gladiolus, E. cf. E. shumardi, Apateodus sp., and four unidentified teleosts. The only reptilian recognized is the small aquatic lizard Coniasaurus crassidens (Dolichosauridae). The taxonomic composition of the Hartland Shale fauna is similar overall to the extensively sampled, underlying mid-Cenomanian Lincoln Limestone fauna in Colorado and Kansas, although the occurrence of Apateodus and Cimolichthys from the Hartland Shale is notable as they represent geologically the oldest record for the two genera. The vertebrates identified are mostly carnivores that include piscivorous and durophagous forms, providing new insights into the trophic structure of the palaeocommunity.

show abstract

Selachians from the Niobrara Formation of the Upper Cretaceous (Coniacian) of Carrot River, Saskatchewan, Canada

Cited by 32 publications

References 1 publication

Skeleton of the Fossil SharkIsurus denticulatusfrom the Turonian (Late Cretaceous) of Germany—Ecological Coevolution with Prey of Mackerel Sharks

Skeleton of the Fossil SharkIsurus denticulatusfrom the Turonian (Late Cretaceous) of Germany—Ecological Coevolution with Prey of Mackerel Sharks

Chondrichthyans from a Cenomanian (Late Cretaceous) bonebed, Saskatchewan, Canada

Marine vertebrates from the Hartland Shale (Upper Cretaceous: Upper Cenomanian) in southeastern Colorado, USA

Contact Info

Product

Resources

About