Ailuridae is a family in the mammal order Carnivora. The family consists of the red panda (the sole living representative) and its extinct relatives.
Georges Cuvier first described Ailurus as belonging to the raccoon family in 1825; this classification has been controversial ever since. It was classified in the raccoon family because of morphological similarities of the head, colored ringed tail, and other morphological and ecological characteristics. Somewhat later, it was assigned to the bear family.
Molecular phylogenetic studies had shown that, as an ancient species in the order Carnivora, the red panda is relatively close to the American raccoon and may be either a monotypic family or a subfamily within the procyonid family. An in-depth mitochondrial DNA population analysis study stated: "According to the fossil record, the Red Panda diverged from its common ancestor with bears about 40 million years ago." With this divergence, by comparing the sequence difference between the red panda and the raccoon, the observed mutation rate for the red panda was calculated to be on the order of 109, which is apparently an underestimate compared with the average rate in mammals. This underestimation is probably due to multiple recurrent mutations as the divergence between the red panda and the raccoon is extremely deep.
The most recent molecular-systematic DNA research places the red panda into its own independent family, Ailuridae. Ailuridae are, in turn, part of a trichotomy within the broad superfamily MusteloideaFlynn et al., 2001 that also includes the Procyonidae (raccoons), the Mephitidae (skunks), and Mustelidae (weasels); but it is not a bear (Ursidae).
Ailurids appear to have originated during the Late Oligocene to Early Miocene in Europe. The earliest known member, Amphictis, was likely an unspecialised carnivore, based on its dentition. Ailurids subsequently dispersed into Asia and North America. The puma-sized Simocyon found in Middle Miocene-Early Pliocene of Europe, North America and China was likely a hypercarnivore. Like modern red panda it had a "false thumb" to aid in climbing. Members of the subfamily Ailurinae, which includes the modern red panda as well as the extinct genera Pristinailurus and Parailurus, developed a specialised dental morphology with blunted cusps, creating an effective grinding surface to process plant material.
Classification The relationship of the Ailuridae with other carnivorans is shown in the following phylogenetic tree, which is based on the molecular phylogenetic analysis of six genes in Flynn (2005), with the musteloids updated following the multigene analysis of Law et al. (2018).
In addition to Ailurus, the family Ailuridae includes seven extinct genera, most of which are assigned to three subfamilies: Amphictinae, Simocyoninae, and Ailurinae.
Family Ailuridae J.E. Gray, 1843 Subfamily †Amphictinae ?Winge, 1896 †Amphictis ?Pomel, 1853 †Amphictis borbonica Viret, 1929 †Amphictis ambigua (Gervais, 1872) †Amphictis milloquensis (Helbing, 1936) †Amphictis antiqua (de Blainville, 1842) †Amphictis schlosseri Heizmann & Morlo, 1994 †Amphictis prolongata Morlo, 1996 †Amphictis wintershofensis Roth, 1994 †Amphictis cuspida Nagel, 2003 †Amphictis timucua J.A. Baskin, 2017 Subfamily †Simocyoninae Dawkins, 1868 †Actiocyon Stock, 1947 †Actiocyon parverratis Smith et al., 2016 †Actiocyon leardi Stock, 1947 †Alopecocyon Camp & Vanderhoof, 1940 †Alopecocyon getti Mein, 1958 †Alopecocyon goeriachensis (Toula, 1884) †Protursus Crusafont & Kurtén, 1976 †Protursus simpsoni Crusafont & Kurtén, 1976 †Simocyon Wagner, 1858 †Simocyon primigenius (Roth & Wagner, 1854) †Simocyon diaphorus (Kaup, 1832) †Simocyon batalleri Viret, 1929 †Simocyon hungaricus Kadic & Kretzoi, 1927 Subfamily Ailurinae J.E. Gray, 1843 †Magerictis Ginsburg et al., 1997 †Magerictis imperialensis Ginsburg et al., 1997 Tribe Pristinailurini Wallace & Lyon, 2022 †Pristinailurus Wallace & Wang, 2004 †Pristinailurus bristoli Wallace & Wang, 2004 †Parailurus Schlosser, 1899 †Parailurus anglicus (Dawkins, 1888) [Parailurus hungaricus Kormos, 1935] †Parailurus tedfordi Wallace & Lyon, 2022 †Parailurus baikalicus Sotnikova, 2008 Tribe Ailurini Ailurus F. Cuvier, 1825 Ailurus fulgens - Red panda Ailurus fulgens styani Thomas, 1902 – Eastern red panda Ailurus fulgens fulgens F. Cuvier, 1825 – Western red panda
In 2025, a comprehensive study describing new material of Magerictis imperialensis also reviewed the phylogeny of the entire family; it placed Magerictis and the new genus Rothictis in the new subfamily Magerictinae, recovered Simocyoninae as paraphyletic to the Ailurinae, and resurrected the family Amphictidae for Amphictis and the new genus Bonisictis.
Family †Amphictidae Winge, 1895 Amphictis Pomel, 1853 Amphictis antiquus Pomel, 1853 Amphictis schlosseri Heizmann & Morlo, 1994 The remaining species A. borbonica, A. ageniensis, A. cuspida, A. timicua were stated to be of indeterminate generic status. Bonisictis Bonisictis ambiguus Gervais, 1872 Bonisictis milloquensis (Helbing, 1928) Family Ailuridae Gray, 1843 Subfamily †Magerictinae Magerictis Ginsburg, Morales, Soria, and Herráez, 1997 Magerictis imperialensis Ginsburg, Morales, Soria, and Herráez, 1997 Rothictis Rothictis prolongata (Morlo, 1996) Rothictis wintershofensis (Heizmann and Morlo, 1994) Subfamily †Simocyoninae Dawkins, 1868 Actiocyon Stock, 1947 Actiocyon leardi Stock, 1947 Actiocyon parverratis Smith et al., 2016 Alopecocyon Camp and Vanderhoof, 1940 Alopecocyon leptorhynchus (Filhol, 1881) [syn.Alopecocyon goeriachensis] Protursus Crusafont & Kurtén, 1976 Protursus simpsoni Crusafont & Kurtén, 1976 Simocyon Wagner, 1858 Simocyon batalleri Viret, 1929 Simocyon diaphorus (Kaup, 1832) Simocyon hungaricus Kadic & Kretzoi, 1927 Simocyon primigenius (Roth & Wagner, 1854) Simocyon marshi Thorpe, 1921 Subfamily Ailurinae Gray, 1843 †Parailurus Schlosser, 1899 Parailurus anglicus (Dawkins, 1888) Parailurus tedfordi Wallace & Lyon, 2022 Parailurus baikalicus Sotnikova, 2008 †Pristinailurus Wallace & Wang, 2004 Pristinailurus bristoli Wallace & Wang, 2004 Ailurus Cuvier, 1825 Ailurus fulgens, the modern red panda
Taxonomic history The species Ailurus fulgens was described by George Cuvier in 1825.Cuvier, F. (1825). Panda. In: G. Saint-Hillaire (Ed.), Histoire naturelle des Mammiferes, avec des figures originales, colorees, desinees d’apres des animaux vivants (pp. 1–3). Chez A. Belin.
In 1843, J.E. Gray assigned Ailurus fulgens to the new subfamily Ailurinae.Gray, J. E. (1843). List of the specimens of Mammalia in the collection of the British Museum. British Museum (Natural History) Publications, The Trustees.
In 1853, Pomel described the new genus Amphictis for "Viverra" antiqua.Pomel, A. (1853). Catalogue methodique et descriptif desvertebres fossiles decouverts dans le bassin hydrographique superieur de la Loire et surtout dans la vallee de son affluent principal l'Allier. In Libraire de L'academie Imperiale de Medecine, Paris (pp. 3–193). Libraire de L’academie Imperiale de Medecine
In 1858 the genus Simocyon was described.Wagner, A. (1858). Geschichte der Urwelt, mit besonderer Ber€ucksichtigung der Menschenrassen und des mosaischen Sch€opfungsberichtes (2nd ed.). Leopold Voss.
The subfamily Simocyoninae was named in 1868 for the genus Simocyon Dawkins, W. B. (1868). Fossil animals and geology of Attica, by Albert Gaudry. (Critical summary). Quarterly Journal of the Geological Society of London, 24, 1–7.
In 1899 the genus Parailurus was named.Schlosser, M. (1899). Parailurus anglicus und Ursus b€ockhi aus den Ligniten von Baroth-K€opecz, Comitat Haromszek in Ungarn. Mitt Jahrbuche K€oniglich Ungarischen Geol Anstalt, 13, 66–95.
In 1940 the new genus Alopecocyon was described.Camp, C. L., & Vanderhoof, V. L. (1940). Bibliography of fossil vertebrates 1928–1933. Geological Society of America, Special Paper, 27, 1–503
In 1947 the new genus Actiocyon was described.
In 1976 the new genus Protursus was described.Crusafont Pairo M., & Kurten B. (1976). Bears and bear-dogs from the Vallesian of the Valles-Penedes Basin, Spain. Acta Zoologica Fennica, 144, 1–29.
In 1997 the new genus Magerictis was described.
An additional, unnamed taxon called only "Ailurinae indet." was described in 2001 based on an upper molar from Four, a Middle Miocene-age locality near Isère, France.
In 2004 the genus Pristinailurus was named.
The new genera Bonisictis and Rothictis were described in 2025, both for species previously assigned to Amphictis. That genus along with Bonictis were assigned to the ressurected family Amphictidae, while Rothictis and Magerictis were assigned to the new ailurid subfamily Magerictinae.
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