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Leptocyon

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Extinct genus of carnivores

Leptocyon Temporal range:Oligocene-Miocene (Whitneyan-Clarendonian) ~30.8–10.3 Ma PreꞒ Ꞓ O S D C P T J K Pg N

Drawing of theholotype skull ofLeptocyon gregorii

Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Carnivora
Family:	Canidae
Subfamily:	Caninae
Genus:	†Leptocyon Matthew, 1918
Species
†L. delicatusLoomis 1932 †L. gregoriiMatthew 1907 †L. vaferLeidy 1858 †L. vulpinusMatthew 1907

Fossil range ofLeptocyon species
Synonyms
NeocynodesmusMacdonald 1963

The genusLeptocyon (Greek:leptos slender +cyon dog) includes 11 species and was the firstcanine. They were small and weighed around 2 kilograms (4.4 lb). They first appeared inNorth America around 34 million years ago in theOligocene, at the same time as theBorophaginae, with whom they share features, indicating that these were two sister groups. Borophaginae skull and dentition were designed for a powerful killing bite compared with the Leptocyon which were designed for snatching small, fast-moving prey. The speciesL. delicatus is the smallest canid to have existed. At the close of their genus 9 million years ago oneLeptocyon lineage resembled the modernfox.^[1]

*L. vafer* skull cast (bottom) of a specimen fromCalifornia, compared to ared fox skull (top). At theAMNH.

Leptocyon were small-bodied, fox-like animals with a long, narrow jaw and delicate teeth. They were probably omnivorous, feeding on small animals and fruit in a diet that remained relatively unchanged during theMiocene.^[2]

References

[edit]

^Wang & Tedford 2008, p. 53.
^Wang & Tedford 2008, p. 51.

Bibliography

[edit]

Wang, Xiaoming;Tedford, Richard H. (2008).Dogs:Their Fossil Relatives and Evolutionary History. Columbia University Press, New York.ISBN 978-0-231-13529-0.

ExtinctCanidae

KingdomAnimalia
PhylumChordata
ClassMammalia
Order:Carnivora
Suborder:Caniformia

Canidae

†Prohesperocyon

†Hesperocyoninae

Hesperocyon Mesocyon Cynodesmus Sunkahetanka Philotrox Enhydrocyon Paraenhydrocyon Caedocyon Ectopocynus
Osbornodon	O. brachypus O. fricki O. iamonensis O. renjiei O. sesnoni O. scitulus O. wangi

†Borophaginae

Phlaocyonini

Cynarctoides
Phlaocyon	P. achoros P. annectens P. latidens P. leucosteus P. mariae P. marslandensis P. minor P. multicuspus P. taylori P. yatkolai

Borophagini

Cynarctina

Paracynarctus
Cynarctus

Aelurodontina

Tomarctus
Aelurodon

Borophagina

Paratomarctus Carpocyon Protepicyon Epicyon
Borophagus	B. diversidens B. dudleyi B. hilli B. littoralis B. orc B. parvus B. pugnator B. secundus

Caninae	see below↓

Caninae

†Leptocyon
†Metalopex

Urocyon	†U. citrinus †U. galushai †U. minicephalus †U. progressus †U. webbi

Vulpini

†Ferrucyon †Prototocyon
Nyctereutes (raccoon dogs)	†N. abdeslami †N. donnezani †N. lockwoodi †N. megamastoides †N. sinensis †N. tingi †N. vinetorum
Vulpes (true foxes)	†V. hassani †V. odessana †V. praeglacialis †V. qiuzhudingi †V. riffautae †V. rooki †V. skinneri †V. stenognathus

Canini(true dogs)

†Canis gezi
†Nurocyon

Cerdocyonina
(zorro)

†Protocyon †Theriodictis
Speothos	†Pleistocene bush dog (S. pacivorus)
†Dusicyon	Falkland Islands wolf (D. australis) D. avus D. cultridens
Lycalopex (South American foxes)	†L. cultridens (?) †L. ensenadensis

Canina(wolf-like canids)	see below↓

Falkland Islands wolf (Dusicyon australis)

Canina(wolf-like canids)

Canina

†Eucyon	E. davisi E. debonisi E. ferox E. intrepidus E. khoikhoi E. kuta E. marinae E. minor E. monticinensis E. skinneri E. wokari E. zhoui
Lycaon	†L. magnus †L. sekowei
Dhole (Cuon alpinus)	†C. a. antiquus †C. a. caucasicus †European dhole (C. a. europaeus) †Tien Shan dhole (C. a. hesperius)

Canis

Coyote (C. latrans)	†Pleistocene coyote (C. l. orcutti)
Red wolf (C. rufus)	†Florida black wolf (C. r. floridanus) †Gregory's wolf (C. r. gregoryi)

Wolf (C. lupus)

†Prehistoric

†Recently
extinct

Sicilian wolf (C. l. cristaldii) Hokkaido wolf (C. l. hattai) Japanese wolf (C. l. hodophilax) Austro-Hungarian wolf
Synonymized underC. l. arctos:Bernard's wolf (C. l. bernardi)
Synonymized underC. l. occidentalis:Kenai Peninsula wolf (C. l. alces) Manitoba wolf (C. l. griseoalbus)
Synonymized underC. l. nubilus:Newfoundland wolf (C. l. beothucus) Cascade mountain wolf (C. l. fuscus) Mogollon mountain wolf (C. l. mogollonensis) Texas wolf (C. l. monstrabilis) Southern Rocky Mountain wolf (C. l. youngi)