Why are hyenas feliforms
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Why Are Hyenas Feliforms?
Evolutionary Lineage and Classification
Hyenas belong to the family Hyaenidae, which is part of the order Carnivora. Within Carnivora, they are classified under the suborder Feliformia, which is characterized by cat-like carnivores. This classification is supported by molecular and morphological evidence that places hyenas as a deeply diverging branch within the Feliformia, closely related to cats (family Felidae) Koepfli2006Westbury2018.
Molecular Phylogenetics
Recent molecular studies have provided robust evidence for the phylogenetic placement of hyenas within Feliformia. By analyzing a molecular supermatrix that includes nuclear gene segments and the complete mitochondrial cytochrome b gene, researchers have confirmed that hyenas form a monophyletic group within Feliformia. This group is closely related to a clade containing species of mongoose (Herpestidae) and the fossa (Cryptoprocta ferox) . These findings are consistent across various phylogenetic reconstruction methods, including maximum parsimony, maximum likelihood, and Bayesian analyses, all of which show strong nodal support for the placement of hyenas within Feliformia .
Morphological Evidence
Morphological studies also support the classification of hyenas as feliforms. The dentition and craniodental morphology of hyenas show adaptations that are consistent with other feliform carnivores. For example, the postcanine dentition of percrocutoid hyenas, an extinct group closely related to modern hyenas, exhibits features that are similar to those of other feliforms, such as specialized bone-cracking adaptations . These morphological traits further corroborate the molecular data, reinforcing the classification of hyenas within Feliformia.
Divergence and Evolutionary History
The divergence of hyenas from their feliform relatives is estimated to have occurred around 29.2 million years ago, during the Middle Oligocene . This timeline is supported by molecular clock estimates and suggests a long evolutionary history within the Feliformia suborder. The aardwolf (Proteles cristatus), a termite-feeding specialist, represents the most basal lineage within the Hyaenidae, indicating a diverse evolutionary path that includes both specialized and generalized feeding strategies .
Conclusion
Hyenas are classified as feliforms due to a combination of molecular and morphological evidence that places them within the cat-like carnivores of the suborder Feliformia. Their evolutionary history, supported by robust phylogenetic analyses and morphological traits, confirms their deep divergence within this group. This classification highlights the complex and diverse evolutionary pathways that have shaped the Hyaenidae family.
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Most relevant research papers on this topic
Molecular systematics of the Hyaenidae: relationships of a relictual lineage resolved by a molecular supermatrix.
The molecular supermatrix resolves the evolutionary relationships among living hyena species, challenging traditional morphological assessments.
Assessing niche conservatism using a multiproxy approach: dietary ecology of extinct and extant spotted hyenas
Chinese Crocuta may have exhibited dietary behavior distinct from that of living extant spotted hyenas, challenging the assumption of niche conservatism in species widely distributed over time and space.
Altered behaviour in spotted hyenas associated with increased human activity
Increased human activity in a Kenyan wildlife reserve led to altered spotted hyena behavior, including larger home ranges, nocturnal behavior, and smaller groups, but these changes did not decrease hyena population density.
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