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Miacoids
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
(unranked): Carnivoramorpha
Superfamily: Miacoidea
Cope, 1880
Families

Miacoidea is an extinct paraphyletic superfamily that has been traditionally divided into two families of carnivores: Miacidae (the miacids) and Viverravidae. They were primitive carnivores which lived during the Paleocene and Eocene Epoch about 33-65 million years ago. Today, Miacoidea is recognized as a paraphyletic array of stem taxa that probably resulted in some "miacoid" genera ending up just outside the order Carnivora. For this reason, Miacoidea are now grouped together in the crown clade Carnivoramorpha. Carnivoramorpha consists of both Miacoidea and Carnivora, but excludes the order Creodonta that evolved later alongside Carnivora. Miacoids are regarded as basal carnivoramorphs. The miacids may also be a paraphyletic family.

The transition from Miacoidea (miacoids) to Miacidae (miacids) to Caniform Carnivora, and Viverravidae to Feliform Carnivora, was a gradual trend during the Paleocene to late Eocene, with taxa from both North America and Eurasia involved. Cladistic analysis shows that different Miacoids evolved into different lineages of Carnivora. Viverravidae are related to Feliformes on the basis of a reduction of the number of molars to two, and an elongated skull. The miacids, however, did not appear until the very end of the Paleocene and are characterized by their shorter skull, and loss of contact between the calcaneum and fibula in the ankle. These two main lineages of modern Carnivora can be traced back to the Early Paleocene by fossil evidence.[1] The Miacidae (miacids) evolved into the modern Caniformes (dogs, bears, raccoons and weasels), while the Viverravidae evolved into the Feliformes (cats, hyaenas and mongooses), both of the order Carnivora.

Miacoids were mostly small marten-like carnivores. They probably fed on invertebrates, lizards, birds and smaller mammals like shrews and opossums, while others may have been insectivores. Some species were arboreal, others lived on the ground. Their teeth and skull show that the miacoids were less developed than modern carnivores.

Classification

References

  1. ^ Kemp, T.S. (2005). The Origin and Evolution of Mammals. Oxford University Press. pp. 247–252. ISBN 0198507607. 
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Wikispecies

Up to date as of January 23, 2010

From Wikispecies

Taxonavigation

Main Page
Cladus: Eukaryota
Supergroup: Unikonta
Cladus: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Mammalia
Subclassis: Theria
Infraclassis: Placentalia
Superordo: Laurasiatheria
Ordo: Carnivora
Subordo: †Miacoidea
Familiae: Miacidae - Viverravidae

Vernacular name

Türkçe: Miyasidler

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