Revision of the Danian Cow Sharks, Sand Tiger Sharks, and Goblin Sharks (Hexanchidae, Odontaspididae, and Mitsukurinidae) from Southern Sweden

Siverson, Mikael

doi:10.1080/02724634.1995.10011203

Cited by 42 publications

(29 citation statements)

References 20 publications

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“…H. microdon is a name usually applied to small, wide fossil teeth, resembling those of the Recent species H. nakamurai Teng , from the late Cretaceous worldwide and from the Palaeogene in North Africa. Similar, if not identical, teeth from the European Tertiary are referred to as H. agassizi (Cappetta , ; Siverson ).…”

Section: Hexanchus Microdon (Agassiz 1835) Figure S–ymentioning

confidence: 99%

“…It offers a unique opportunity to study how a shark fauna in the boreal realm was affected by the K/T boundary within a comparatively short period of time. Only a handful of papers include information on Danian shark faunas (Herman ; Siverson ; Noubhani and Cappetta ; Mannering and Hiller ), but none of these authors included boundary material in their descriptions, leaving a big gap in the understanding of how chondrichthyans coped with this catastrophic event.…”

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confidence: 99%

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Crossing the boundary: an elasmobranch fauna from Stevns Klint, Denmark

Adolfssen

Ward

2013

Palaeontology

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The chondrichthyan faunas from the Danish Maastrichtian chalk and the K/T boundary clay, the Fiskeler, are described for the first time. The rich and diverse fauna discovered in the late Maastrichtian chalk experienced a massive drop in diversity prior to the boundary. However, the fauna started to recover immediately after the deposition of the impact layer during earliest Danian times and had regained much of its diversity during the first few millennia after the bolide impact. Precision sampling has made it possible to document the recovery of the fauna, which did not suffer an extinction event of the same magnitude, as apparently observed in Morocco. At Stevns Klint, only 33 per cent of the chondrichthyan fauna became extinct compared with the 96 per cent in Morocco. The drop in diversity before the boundary is attributed to a sudden change in sea level. Among the sharks found in the chalk and Fiskeler are rare species such as Parasquatina and Echinorhinus and the first representative of Nebrius in Europe.

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Section: Hexanchus Microdon (Agassiz 1835) Figure S–ymentioning

confidence: 99%

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confidence: 99%

Crossing the boundary: an elasmobranch fauna from Stevns Klint, Denmark

Adolfssen

Ward

2013

Palaeontology

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“…The identification of isolated teeth remains problematic because of very similar and conservative morphological features, which have only changed slightly since the Early Cretaceous (e.g. Cappetta 1975;Siverson 1995).…”

Section: Phylogenetic Implicationsmentioning

confidence: 99%

Node age estimations and the origin of angel sharks, Squatiniformes (Neoselachii, Squalomorphii)

Klug

Kriwet

2013

Journal of Systematic Palaeontology

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The fossil record of angel sharks is reviewed with special focus on skeletal remains. A new family †Pseudorhinidae is established for two species based on complete specimens from the Late Jurassic and a possible third species based on isolated teeth. This clade is a member of the stem lineage of Squatiniformes. Squatinidae represents the crown with a reliable fossil record extending back into the Aptian based on a partial skeleton displaying characteristic morphological traits of Squatina. We also present revised morphological descriptions of the skeletal remains of †Squatina baumbergensis (Campanian of Germany) and †Squatina sp. (Miocene of Japan). In this study, we used reliable skeletal remains and a modified approach to establish the origin and divergence of the Squatiniformes and the Squatinidae. Isolated teeth are considered to be unreliable because of the poor knowledge of squatiniform dental character traits and their evolution. We estimate a 'hard' minimum age constraint of 156.2 Ma and a 'soft' maximum age constraint of 181.74 Ma for the origin of the Squatiniformes. For the crown represented by the Squatinidae, we estimate a 'hard' minimum age constraint of 114 Ma and a 'soft' maximum age constraint of 157.59 Ma. These age constraints most likely designate the timing of the origin of identifiable squatiniform and squatinid characters as currently understood rather than the origin of the Squatiniformes or the divergence between the †Pseudorhinidae and the Squatinidae. The lack of pre-Late Jurassic pseudorhinids and pre-Cretaceous squatinids probably represents an artefact because characteristic squatiniform tooth morphologies, which generally provide only a restricted set of diagnosable features, might not have yet been fully developed. Consequently, skeletal remains of neoselachians from the Early and Middle Jurassic are crucial for establishing reliable characters of stem-lineage representatives and to avoid misinterpretations resulting from transferring morphological traits of the crown to fossil groups with unresolved interrelationships, as well as sister-group relations.http://zoobank.org/urn:lsid:zoobank.org:pub:5A5FA554-C834-48E3-AE44-6F92DE9CB5F1

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“…The fossil faunas are composed of macro-invertebrates such as bryozoans, echinoderms (especially Echinocorys), and bivalves, but also remains of vertebrates, such as crocodiles, bony fishes, and sharks. Further information on the geology and palaeontology of the Limhamn quarry is provided by Brotzen (1959Brotzen ( , 1960, Holland & Gabrielson (1979), Siverson (1995), and Sivhed et al (1999).…”

Section: Geological Settingmentioning

confidence: 98%

“…49; between the uppermost level with chert and silicified limestone and the L31 sample in the figure). Biostratigraphically, this interval belongs to the lower-middle NP3 (Nanno-Plankton Zone 3) (Perch-Nielsen 1979;Siverson 1995). The bulk of the material was derived from two samples (93-14MS and 93-1MS) collected in situ from the southern quarry wall (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Scolecodonts from the Upper Danian (Paleocene) of Skåne, Sweden

Bergman¹,

Eriksson²

2003

GFF

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Jaws of fossil marine polychaete annelids, scolecodonts, from Sweden have chiefly been reported from Silurian strata. The specimens described in this paper come from Upper Danian (Paleocene) strata of the Limhamn quarry in Skåne (Scania), the southernmost province of Sweden. The jaws are assigned to the Recent genera Glycera and Drilonereis, but their state of preservation did not allow species identification. The low diversity fauna is almost exclusively composed of Glycera sp. It differs conspicuously in taxonomical composition from Palaeozoic assemblages and exhibits close affinity to other Mesozoic and Cenozoic faunas as well as and modern ones.

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Revision of the Danian Cow Sharks, Sand Tiger Sharks, and Goblin Sharks (Hexanchidae, Odontaspididae, and Mitsukurinidae) from Southern Sweden

Cited by 42 publications

References 20 publications

Crossing the boundary: an elasmobranch fauna from Stevns Klint, Denmark

Crossing the boundary: an elasmobranch fauna from Stevns Klint, Denmark

Node age estimations and the origin of angel sharks, Squatiniformes (Neoselachii, Squalomorphii)

Scolecodonts from the Upper Danian (Paleocene) of Skåne, Sweden

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