Elpistostege

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Elpistostege
Temporal range: Frasnian
Elpistostege watsoni on display at the Miguasha National Park
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Sarcopterygii
Clade: Tetrapodomorpha
Clade: Stegocephali
Family: Elpistostegidae
Genus: Elpistostege
Westoll, 1938
Species:
E. watsoni
Binomial name
Elpistostege watsoni
Westoll, 1938

Elpistostege is an

Late Devonian epoch. Its only known species, E. watsoni, was first described in 1938 by the British palaeontologist Thomas Stanley Westoll, based on a single partial skull roof discovered at the Escuminac Formation in Quebec, Canada.[1]

In 2010, a complete specimen was found in the same formation, which was described by Richard Cloutier and colleagues in 2020. It reveals that the paired fins of Elpistostege contained bones

lepidotrichia (fin rays), which indicates that the origin of phalanges preceded the loss of fin rays, rather than the other way around.[2][3]

Relationships

An analysis conducted by Swartz in 2012 found Elpistostege to be the sister taxon of Tiktaalik. Both were found to be primitive members of the group Elpistostegalia, along with other advanced stem-tetrapods.[4]

Elpistostegalia

Panderichthys

Stegocephalia
sensu Laurin, 1998

The 2020 study by Cloutier et al. instead recovers Elpistostege as the sister taxon of all limbed vertebrates, crownward of Tiktaalik:[2]

References

External links