Definitions

family hexanchidae

Time range of Hexanchiformes species

The shark order Hexanchiformes (in a broad sense, not only comprising the cow sharks, but also including the frilled sharks, Chlamydoselachidae) is often considered the most primitive of extant sharks, since they share some features with Paleozoic and early-Mesozoic shark groups as the Cladoselachiformes. Thus, it is interesting to see how far back the fossil record of this order reaches.

Family Chlamydoselachidae

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Species Lower Cretaceous Upper Cretaceous Paleocene Eocene Oligocene Miocene Pliocene Pleistocene Holocene Extant
B V H B A A C T C S C M D S T Y L B P R C A B L S T M Z P G L M U
Chlamydoselachus thomsoni
Chlamydoselachus gracilis
Chlamydoselachus goliath
Thrinax baumgartneri
Chlamydoselachus fiedleri
Chlamydoselachus tobleri .
Chlamydoselachus bracheri
Chlamydoselachus lawleyi
Chlamydoselachus anguineus

Family Heptranchidae

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Species Lower Cretaceous Upper Cretaceous Paleocene Eocene Oligocene Miocene Pliocene Pleistocene Holocene Extant
B V H B A A C T C S C M D S T Y L B P R C A B L S T M Z P G L M U
Heptranchias howelii .
Heptranchias ezoensis
Heptranchias tenuidens
Heptranchias perlo . . - - - - - -

Family Hexanchidae

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Genus Species Early Jurassic Middle Jurassic Upper Jurassic Lower Cretaceous Upper Cretaceous Paleocene Eocene Oligocene Miocene Pliocene Pleistocene Holocene Extant
H S P T A B B C O K T B V H B A A C T C S C M D S T Y L B P R C A B L S T M Z P G L M U
Hexanchus arzoensis
microdon “agassizii” . . . .
gracilis
collinsonae
hookeri
agassizi .
griseus .
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nakamurai “vitulus”
griseus “andersoni” “gigas" .
Notidanoides - .
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Notidanodon lanceolatus . -
antarcti
dentatus
pectinatus
brotzeni”
loozi”
Notorynchus “Notidanus” aptiensis”
“Notidanus” intermedius
“Notidanus” lawleyi
“Notidanus” munsteri
“Notidanus” cepedianus “primigenius” “kempi” . . .
“Notidanus” serratissimus
“Notidanus” serratus

References

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