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Laytonia Temporal range: Zemorrian to Upper Miocene^[1] PreꞒ Ꞓ O S D C P T J K Pg N

L. californica and Bolbocara
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Notacanthiformes
Family:	Halosauridae
Genus:	†Laytonia
Type species
Laytonia californica David 1943
Species
L. californica L. zemorrensis David 1948

Laytonia is an extinct genus of prehistoric halosaur that lived in deep water off the North American Pacific Coast from the Zemorrian Epoch (comprising either the latest Oligocene or lower Miocene) until during the Upper Miocene subepoch, when tectonic uplift effectively destroyed the genus' habitat by making the deep water too shallow.^[2]

There are two species recognized, the type species, L. californica, which is known from at least 2 whole fossils, and fossil scales from Upper Miocene strata of Southern California, and L. zemorrensis, known from fossil scales in Zemorrian strata (either Oligocene or Lower Miocene) from Oregon and California.

According to the fossils of L. californica, the living animals were very slender, and had a long, fringe-like dorsal fin running almost the entire length of the body, from the head to the tip of the tail. The dorsal fin forms two crests, a first, low crest on top of the back of the head, and a second, large crest near the upper back, above the pectoral fins.

The name comes from discoverer of the fossil, Melvin E. Layton.

References

^ David, Lore "Halosauridae from the California Tertiary" 1948
^ David, Lore Rose. January 10, 1943. Miocene Fishes of Southern California The Society

Elopomorph genera

Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Subclass: Neopterygii
Infraclass: Teleostei

Actinopterygii

- see Actinopterygii

Neopterygii

- see Neopterygii

Teleostei

see Teleostei
Elopomorpha	see below↓

Elopomorpha

Elopiformes

†Anaethalion †Aulothrissus †Daitingichthys †Davichthys †Echinelops †Eichstaettia †Elopsomolos †Eoprotelops †Epaelops †Flindersichthys †Ichthyemidion †Leptoelops †Naiathaelon †Protelops
†Phyllodontidae	Egertonia Eodiaphyodus Paralbula Phyllodus Pseudoegertonia
Elopidae	†Ctenodentelops Elops †Kipalelops †Lyrolepis †Protoelops
Megalopidae	†Arratiaelops †Brouweria †Elopoides Megalops †Paratarpon †Promegalops †Protarpon †Sedenhorstia

Albuliformes

†Baugeichthys †Brannerion †Bullichthys †Euroka †Farinichthys †Holcolepis †Lebonichthys †Marathonichthys †Osmeroides †Palealbula †Paraelops †Protalbula †Stewartichthys
Albulidae	Albula †Casierius †Deltaichthys †Elopothrissus †Hajulia †Istieus †Italoalbula Nemoossis †Nunaneichthys †Phosphonatator †Pteralbula Pterothrissus

Notacanthiformes

Notacanthidae	Lipogenys Notacanthus Polyacanthonotus
Halosauridae	Aldrovandia †Echidnocephalus Halosauropsis Halosaurus †Laytonia

Anguilliformes

- see Eels

Category

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This page was last edited on 30 May 2022, at 21:05

Laytonia

From Wikipedia, the free encyclopedia

See also

References