Late Cretaceous (Cenomanian-Campanian) mid-palaeolatitude sharks of Cretalamna appendiculata type

Siversson, Mikael; Newbrey, Michael G.; Cederström, Peter; Cook, Todd D.

doi:10.4202/app.2012.0137

Cited by 25 publications

(75 citation statements)

References 43 publications

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“…Labiolingually compressed crowns with no ornamentation, small lateral cusplets in the anterior teeth and large diverging lateral cusplets in the lateral teeth, bilobate root, absence of nutritive groove in the lingual protuberance of the root are some of the important characters diagnostic of the genus Cretalamna . Though many Cretalamna teeth from different parts of the world have generally been referred to C. appendiculata , recent revision of this group indicates the presence of many species groups (Siverson, Lindgren, Newbrey, Cederström, & Cook, ). The specimens described here differ from well‐known African species, C. maroccana and C. biauriculata in having bilobate root and only one pair of lateral cusplets.…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…The specimens described here differ from well‐known African species, C. maroccana and C. biauriculata in having bilobate root and only one pair of lateral cusplets. Siverson et al () are of the opinion that the highly diagnostic root of Cretalamna, if moderately to severely abraded, will render the identification of isolated teeth below genus level difficult. Therefore, the worn and partially preserved roots of the present specimens referred to Cretalamna do not permit their identification at species level and are described as Cretalamna sp.…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…Though many Cretalamna teeth from different parts of the world have generally been referred to C. appendiculata, recent revision of this group indicates the presence of many species groups(Siverson, Lindgren, Newbrey, Cederström, & Cook, 2015). The specimens described here differ from well-known African species, C. maroccana and C. biauriculata in having bilobate root and only one pair of lateral cusplets Siverson et al (2015). are of the opinion that the highly diagnostic root of Cretalamna, if moderately to severely abraded, will render the identification of isolated teeth below genus level difficult.…”

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Elasmobranch fauna from the upper most part of the Cretaceous Bagh Group, Narmada valley, India

Prasad

Verma²,

Sahni

et al. 2017

Island Arc

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In India, Cretaceous elasmobranchs are known from the uppermost Cretaceous Deccan intertrappean sedimentary sequences of peninsular India and the lower Upper Cretaceous (Cenomanian) Karai Formation of the Cauvery basin, South India. The intertrappean elasmobranchs are represented mainly by rays and skates, whereas the Karai fauna is known by hexanchiform, squaliform, and lamniform sharks. The latter assemblage is dominated by cool temperate water forms in addition to some cosmopolitan forms. Here new shark teeth recovered from the upper part of the marine Cretaceous Bagh Group, in the lower Narmada valley, Western India are described. This is the first detailed description of sharks from the Bagh Group and the first record of sharks from the youngest horizons (Coniacian to Late Maastrichtian) of this marine sedimentary sequence. The fauna, recovered from an oyster shell‐rich green sandstone at the top of the youngest geological unit (the Coralline Limestone) of the Bagh Group, is assigned to Ptychodus sp., Scapanorhynchus sp. aff. S. raphiodon (Agassiz, 1844), Cretodus sp. aff. C. crassidens (Dixon, 1850), Cretalamna sp., Squalicorax sp. aff. S. falcatus Agassiz, 1843, and Elasmobranchii indet. This assemblage, previously widely documented from the Cretaceous deposits of North and South Americas, Europe, North and West Africa, Far East and Near East, demonstrates that there is a clear change in elasmobranch faunal composition of India from cool temperate water forms in the early Late Cretaceous to essentially cosmopolitan forms in the Late Cretaceous.

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Section: Systematic Paleontologymentioning

confidence: 99%

Section: Systematic Paleontologymentioning

confidence: 99%

mentioning

confidence: 99%

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Elasmobranch fauna from the upper most part of the Cretaceous Bagh Group, Narmada valley, India

Prasad

Verma²,

Sahni

et al. 2017

Island Arc

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“…Teeth of the otodontid shark Cretalamna sarcoportheta are abundant in Bed 3 (about as common as the teeth of A. kopingensis and S. lindstromi combined) and their size, relative to the maximum recorded for this species, indicates that the vast majority originate from large juveniles to adult individuals. Assuming a low tooth count similar to that of C. hattini Siversson et al, 2015, we estimate that the combined width of all upper jaw teeth was about 145-150 mm on each palatoquadrate in large individuals (see Siversson et al, 2015, fig. 19c).…”

Section: Chondrichthyans As Palaeoenvironmental Indicatorsmentioning

confidence: 99%

“…Because of the relatively large aperture mesh (2 mm), meaningful studies of population dynamics are restricted to large-toothed lamniform sharks. Four of the larger lamniforms in Bed 3 are represented by abundant material: Archaeolamna kopingensis (Davis, 1890), "Carcharias" latus (Davis, 1890), Cretalamna sarcoportheta Siversson et al (2015) and Squalicorax lindstromi (Davis, 1890). Teeth of A. kopingensis are common in Bed 3 but are of smaller size compared with specimens from Beds 1 and 2, indicating a larger percentage of immature individuals (Fig.…”

Section: Chondrichthyans As Palaeoenvironmental Indicatorsmentioning

confidence: 99%

Did mangrove communities exist in the Late Cretaceous of the Kristianstad Basin, Sweden?

McLoughlin

Haig

Siversson

et al. 2018

Palaeogeography, Palaeoclimatology, Palaeoecology

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Previous inferences of oyster-dominated communities occupying mangrove-like depositional settings in the Kristianstad Basin, Sweden, during the late early Campanian are reassessed. A significant percentage of oysters (Acutostrea incurva) from the Belemnellocamax mammillatus zone in Bed 3 at Åsen bear indentations on their left valves indicating attachment to plant axes. Many of these axes bear morphological features characteristic of the distal subaerial portions of woody plant branches and appear to have been rafted into the marine environment rather than representing in situ mangrove stems and roots. Foraminiferal assemblages recovered from sediment within the oyster body cavities differ from modern mangrove-community associations by the absence of siliceous agglutinated Foraminifera, the presence of diverse and relatively abundant Lagenida, relatively common triserial Buliminida, and a notable percentage of planktonic taxa. Chondrichthyan teeth assemblages from the same beds are similarly incompatible with the interpretation of a mangrove depositional environment based on comparisons with the distribution of related extant taxa. Apart from oyster shells and belemnite rostra, these beds are notably depauperate in diversity and abundance of macroinvertebrate remains compared with coeval carbonate shoal and rocky shoreline assemblages from the same basin. The collective palaeontological and sedimentological evidence favours an inner neritic sandy-substrate setting, but not nearshore or mangrove-like depositional environment for the oyster-rich Bed 3 at Åsen. The absence of mangrove-like assemblages at Åsen is consistent with the development of modern mangrove ecosystems much later (during the Maastrichtian and Cenozoic) based on the global palynological record.

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Lamniform sharks from the Cenomanian (Upper Cretaceous) of Venezuela

Guinot

Carrillo-Briceño

2018

Cretaceous Research

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Sampling of Cenomanian fossil-rich horizons within the La Luna Formation of two localities in the Zulia and Trujillo states (northern Venezuela) yielded numerous shark teeth belonging to various species within the order Lamniformes (Mackerel sharks). Twelve lamniform species were identified including three new species (Squalicorax lalunaensis sp. nov., Squalicorax moodyi sp. nov., Acutalamna karsteni gen. et sp. nov.) and the genus Microcarcharias gen. nov. is proposed to accommodate with the peculiar morphology of the small-sized odontaspidid M. saskatchewanensis. Other taxa reported here include Cretoxyrhina mantelli, Cretolamna sp., cf. Nanocorax sp. and five Squalicorax species left in open nomenclature. This is the first report of chondrichthyans from the mid-Cretaceous of Venezuela and one of the few records of this group from the Cenomanian of South America. The composition of these assemblages suggests some degree of endemism in the La Luna Sea but also possible connexions with the Western Interior Seaway. One of the most striking features of these assemblages is the high anacoracid diversity (eight species) despite the corresponding outer shelf/upper slope palaeoenvironments of the La Luna Formation. The high diversity of these opportunistic predators is probably related to the high diversity of medium to large marine vertebrates that provided food resources. Keywords Chondrichthyes;

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Late Cretaceous (Cenomanian-Campanian) mid-palaeolatitude sharks of Cretalamna appendiculata type

Cited by 25 publications

References 43 publications

Elasmobranch fauna from the upper most part of the Cretaceous Bagh Group, Narmada valley, India

Elasmobranch fauna from the upper most part of the Cretaceous Bagh Group, Narmada valley, India

Did mangrove communities exist in the Late Cretaceous of the Kristianstad Basin, Sweden?

Lamniform sharks from the Cenomanian (Upper Cretaceous) of Venezuela

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