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 Cretaceous						Upper Cretaceous						Paleocene			Eocene				Oligocene		Miocene						Pliocene			Pleistocene			Holocene	Extant
Species	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	Holocene	Extant
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 Cretaceous						Upper Cretaceous						Paleocene			Eocene				Oligocene		Miocene						Pliocene			Pleistocene			Holocene	Extant
Species	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	Holocene	Extant
Heptranchias howellii												.
Heptranchias ezoensis
Heptranchias tenuidens
Heptranchias perlo																											.	.	-	-	-	-	-	-

Genus	Species	Early Jurassic				Middle Jurassic				Upper Jurassic			Lower Cretaceous						Upper Cretaceous						Paleocene			Eocene				Oligocene		Miocene						Pliocene			Pleistocene			Holocene	Extant
Genus	Species	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	Holocene	Extant
Hexanchus	arzoensis
	microdon “agassizii”																	.							.			.				.
	gracilis
	collinsonae
	hookeri
	agassizi																											.
	griseus																															.		-	-	-	-	-	-	-	-	-	-	-	-	-
	nakamurai “vitulus”
	griseus “andersoni” “gigas"																																	.
Notidanoides	-										.	-	-	-	-	-	-	-	-	-	-	-
Notidanodon	lanceolatus														.		-
	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

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]
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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[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]

[Antunes-Cappetta-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]