Morsoravidae

Morsoravidae
Temporal range: Early Eocene
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Clade: Australaves
Family: †Morsoravidae
Mayr, 2023
Genera

Morsoravidae is a family of extinct birds known from the Early Eocene of Europe and North America, related to the Psittacopasseres, the clade containing parrots and songbirds. They have specialised feeding ecologies, and one morsoravid, Pumiliornis tesselatus, fed on nectar. The family contains the genera Morsoravis, Pumiliornis, and Sororavis.

Description

Common to the Morsoravidae is a distinctive morphology of the tarsometatarsus. The trochlea of the second and fourth metatarsals are distinct, and the fourth metatarsal trochlea is slanted in a way that strongly suggests that morsoravids were at least facultatively zygodactyl. The second metatarsal trochlea is characterised by large size (compared to Psittacopedidae and Zygodactylidae) and a cylindrical shape that allows little rotational movement of the toe. These adaptations are thought to improve these birds' climbing ability.[1]

One morsoravid, a 47-million year old specimen of Pumiliornis tesselatus, has been found with pollen grains in its gut,[2] indicating at least some level of nectarivory.[1] Another morsoravid, Sororavis solitarius, is similar to mousebirds in details of the legs, suggesting that it could have been able to hang off of branches to reach food items.[1]

Distribution

Although the named species of Morsoravidae are all known from European sites only, there is evidence that they also lived in North America in the early Eocene. A skeleton found from the Green River Formation in the United States is closely related to Morsoravis and Sororavis. Other morsoravids are known from the Fur Formation of Denmark, the Messel Pit in Germany, and the London Clay of England.[1]

See also

References

  1. ^ a b c d "A new fossil from the London Clay documents the convergent origin of a "mousebird-like" tarsometatarsus in an early Eocene near-passerine bird - Acta Palaeontologica Polonica". www.app.pan.pl. Retrieved 2023-11-04.
  2. ^ Mayr, Gerald; Wilde, Volker (2014-05-01). "Eocene fossil is earliest evidence of flower-visiting by birds". Biology Letters. 10 (5): 20140223. doi:10.1098/rsbl.2014.0223. ISSN 1744-9561. PMC 4046380. PMID 24872461.

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