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

Species Lower CretaceousUpper CretaceousPaleoceneEoceneOligoceneMiocenePliocenePleistoceneHoloceneExtant
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Chlamydoselachus thomsoni[1]
Chlamydoselachus gracilis[2]
Chlamydoselachus goliath[2]
Proteothrinax baumgartneri
Chlamydoselachus fiedleri
Chlamydoselachus tobleri.
Chlamydoselachus bracheri
Chlamydoselachus lawleyi
Chlamydoselachus anguineus

Family Hexanchidae

Species Lower CretaceousUpper CretaceousPaleoceneEoceneOligoceneMiocenePliocenePleistoceneHoloceneExtant
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Heptranchias howellii.
Heptranchias ezoensis
Heptranchias tenuidens
Heptranchias perlo..------


GenusSpeciesEarly JurassicMiddle JurassicUpper JurassicLower CretaceousUpper CretaceousPaleoceneEoceneOligoceneMiocenePliocenePleistoceneHoloceneExtant
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Hexanchusarzoensis
microdon “agassizii”....
gracilis
collinsonae
hookeri
agassizi.
griseus.
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nakamurai “vitulus”
griseus “andersoni” “gigas".
Notidanoides-.
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Notidanodonlanceolatus.-
antarcti
dentatus
pectinatus
brotzeni”
loozi”
Notorynchus“Notidanus” aptiensis”
“Notidanus” intermedius
“Notidanus” lawleyi
“Notidanus” munsteri
“Notidanus” cepedianus “primigenius” “kempi”...
“Notidanus” serratissimus
“Notidanus” serratus
gollark: Anyway, for now the DNS to IRC bridge is basically just a moderately funny thing and/or a way to send messages someone might eventually read out of very constrained networks.
gollark: Applications may occasionally be answered.
gollark: https://a.gh0.pw/3
gollark: I mean making good use of the DNS packets, not CPU use on each end; I don't really care about that.
gollark: So you probably need checksums now and you use up even more of the packet size.

References

  1. Richter & Ward (1990 ): "Fish remains from the Santa Marta Formation (Late Cretaceous) of James Ross Island, Antarctica." Antarct Sci 2 (1) : 71 [Zoological Record Volume 126]
  2. Antunes & Cappetta (2002): [Selachians from the Cretaceous (Albian-Maastrichtian) from Angola.] Palaeontogr Abt A Palaeozool-Stratigr 264 (5-6) April: 107 [Zoological Record Volume 138]


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