Amphicyonidae
Amphicyonidae is an extinct family of terrestrial carnivorans belonging to the suborder Caniformia. They first appeared in North America in the middle Eocene (around 45 mya), spread to Europe by the late Eocene (35 mya), and appear in Asia, and Africa by the early Miocene (23 mya). They had largely disappeared worldwide by the late Miocene (5 mya), with the latest recorded species at the end of the Miocene in Africa. They were among the first carnivorans to evolve large body size. Amphicyonids are colloquially referred to as "bear-dogs".[1]
| Amphicyonidae | |
|---|---|
| Skeleton of Amphicyon | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Carnivora |
| Suborder: | Caniformia |
| Superfamily: | †Amphicyonoidea |
| Family: | †Amphicyonidae Haeckel, 1886 |
| Subfamilies | |
| †Amphicyoninae | |
Taxonomy
The family was erected by Haeckel (1886) [also attributed to Trouessart (1885)]. Their exact position has long been disputed. Some early paleontologists defined them as members of the family Canidae, but the modern consensus is that they form their own family. Some researchers have defined it as the sister clade to ursids (bears), based on morphological analysis of the ear region.[2][1] However, cladistic analysis and reclassification of several species of early carnivore as amphicyonids has strongly suggested that they may be basal caniforms, from lineages older than the origin of both bears and dogs.[3][4][5]
Description
Amphicyonids ranged in size from as small as 5 kg (11 lb) and as large as 100 to 773 kg (220 to 1,704 lb)[6] and evolved from wolf-like to bear-like body forms.[7] Early amphicyonids, such as Daphoenodon, possessed a digitigrade posture and locomotion (walking on their toes), while many of the later and larger species were plantigrade or semiplantigrade.[8] The amphicyonids were obligate carnivores, unlike the Canidae, which are hypercarnivores or mesocarnivores.[9]
There is often some confusion with the similar looking (and similarly named) "dog-bears", a more derived group of caniforms that is sometimes classified as a family (Hemicyonidae), but is more often considered a primitive subfamily of ursids (Hemicyoninae).
Evolution
It has long been uncertain where amphicyonids originated. It was thought that they may have crossed from Europe to North America during the Miocene epoch, but recent research suggests a possible North American origin from the miacids Miacis cognitus and M. australis (now renamed as the genera Gustafsonia and Angelarctocyon, respectively). As these are of North American origin, but appear to be early amphicyonids, it may be that the Amphicyonidae actually originates in North America.[3]
Other New World amphicyonids include the oldest known amphicyonid, Daphoenus (37–16 Mya).
Amphicyonids began to decline in the late Miocene, and disappeared by the end of the epoch. The exact reasons for this are unclear. The most recent known amphicyonid remains are teeth known from the Dhok Pathan horizon, northern Pakistan, dating to 7.4-5.3 mya.[10] The species is classically named Arctamphicyon lydekkeri, which may actually be synonymous with a species of Amphicyon.[11]
Fossils of juvenile Agnotherium, Ischyrocyon, and Magericyon all show an unusual type of tooth eruption in which there is a vulnerable stage at about two or three years of age where the subadult animal has no functional molar or carnassial teeth, the only functional cheek teeth being several milk premolars.[12] This period was suggested to be "presumably short" but would have made it very difficult for the animal to process food.[13] This type of tooth replacement is not seen in similar carnivorans like ursids or canids, and may have been one factor in the extinction of the Amphicyonidae.
Classification
- Family Amphicyonidae
- Genus Amphicyanis
- Genus Angelarctocyon
- A. australis (formerly Miacis australis)
- Genus Brachycyon
- B. reyi
- B. palaeolycos
- B. gaudryi
- Genus Gustafsonia
- G. cognita (formerly Miacis cognitus)
- Genus Guangxicyon
- G. sinoamericanus
- Genus Harpagocyon[14][15]
- H. inusitatus
- Genus Harpagophagus
- Genus Paradaphoenus
- P. cuspigerus
- P. minimus
- P. tooheyi
- Genus Sarcocyon (Possible affinities with the Haplocyoninae) [16][17]
- S. ferox
- Genus Storchictis[18]
- S. miacinus
- Genus Symplectocyon[15]
- S. praecursor
- Subfamily Amphicyoninae
- Genus Afrocyon[19]
- A. burolleti
- Genus Amphicyon
- A. astrei
- A. carnutense?
- A. cooperi
- A. frendens
- A. galushai
- A. giganteus?
- A. gutmanni
- A. ingens
- A. lactorensis
- A. laugnacensis
- A. longiramus
- A. lyddekeri?
- A. major (type)
- A. palaeindicus?
- A. pannonicus
- A. shahbazi
- A. ulungurensis
- A. zhanxiangi
- Genus Bonisicyon[20]
- B. illacabo
- Genus Cynelos[21]
- C. caroniavorus
- C. crassidens
- C. helbingo
- C. idoneus
- C. jitu
- C. jourdan
- C. lemanensis
- C. macrodon
- C. minor
- C. pivetaui
- C. rugosidens
- C. schlosseri
- C. sinapius
- Genus Cynodictis[22][15]
- C. cayluxensis
- "C. compressidens"
- C. crassus
- C. exilis
- C. ferox
- C. intermedius
- C. lacustris
- C. longirostris
- "C. palmidens"
- C. peignei
- Genus Dehmicyon
- D. schlosseri
- Genus Goupilictis
- G. minor
- Genus Hecubides[21]
- H. euryodon
- Genus Ictiocyon
- I. socialis
- Genus Ischyrocyon
- I. gidleyi
- Genus Janvierocyon
- J. pontignensis
- Genus Magericyon
- M. anceps
- M. castellanus
- Genus Myacyon[23]
- M. dojambir
- M. kiptalami
- M. peignei
- Genus Mogharacyon[21]
- M. anubisi
- Genus Namibiocyon [24]
- N. ginsburgi
- Genus Paludocyon[25]
- P. bohemicus
- Genus Pliocyon
- P. medius
- P. ossifragus
- P. robustus
- Genus Pseudamphicyon
- Genus Pseudocyon
- P. sansaniensis
- P. steinheimensis?
- P. styriacus
- Genus Pseudarctos
- P. bavaricus
- Genus Pseudocyonopsis[26][15]
- P. ambiguus
- P. antiquus
- P. landesquei
- P. quercensis
- Genus Tartarocyon
- T. cazanavei
- Genus Afrocyon[19]
- Subfamily Haplocyoninae (Eurasia)[17][27]
- Genus Aktaucyon
- A. brachifacialis
- Genus Gobicyon
- G. acutus
- G. macrognathus
- G. serbiae
- G. yei
- G. zhegalloi
- Genus Haplocyon[15]
- H. elegans
- H. dombrowskii
- H. crucians
- Genus Haplocyonoides
- H. mordax
- H. serbiae
- H. ponticus
- Genus Haplocyonopsis
- H. crassidens
- Genus Aktaucyon
- Subfamily Daphoeninae (North America)
- Genus Adilophontes
- A. brachykolos
- Genus Brachyrhyncocyon
- B. dodgei
- B. montanus
- Genus Daphoenictis
- D. tedfordi
- Genus Daphoenodon
- D. falkenbachi
- D. notionastes
- D. robustum
- D. periculosus
- D. skinneri
- D. superbus
- Genus Daphoenus
- D. felinus
- D. hartshornianus
- D. lambei
- D. nebrascensis
- D. socialis
- D. transversus
- D. vetus
- Genus Adilophontes
- Subfamily Temnocyoninae (North America)[28]
- Genus Delotrochanter
- D. major
- D. oryktes
- D. petersoni
- Genus Mammacyon
- M. ferocior
- M. obtusidens
- Genus Rudiocyon
- R. amplidens
- Genus Temnocyon
- T. altigenis
- T. ferox
- T. fingeruti
- T. macrogenys
- T. percussor
- T. subferox
- Genus Delotrochanter
- Subfamily Thaumastocyoninae[29]
- Genus Agnotherium
- A. antiquus
- Genus Ammitocyon
- A. kainos
- Genus Crassidia
- C. intermedia
- Genus Peignecyon
- P. felinoides
- Genus Thaumastocyon
- T. bourgeoisi
- T. dirus
- Genus Tomocyon[30]
- T. grivense
- Genus Ysengrinia
- "Y. americanus"
- Y. depereti
- Y. geraniana
- Y. tolosana
- "Y. valentiana"
- Genus Agnotherium
References
- ^ a b Wang, Xiaoming and Richard H. Tedford (2008). Dogs; their Fossil Relatives and Evolutionary History. Columbia University Press. pp. 10–11. ISBN 9780231135283.
- ^ R. M. Hunt. 2001. Small Oligocene amphicyonids from North America (Paradaphoenus, Mammalia, Carnivora). American Museum Novitates 3331:1-20
- ^ a b Tomiya S., and Tseng Z. J. 2016 Whence the beardogs? Reappraisal of the Middle to Late Eocene 'Miacis' from Texas, USA, and the origin of Amphicyonidae (Mammalia, Carnivora). Royal Society Open Science. DOI: 10.1098/rsos.160518 http://rsos.royalsocietypublishing.org/content/3/10/160518
- ^ Hunt, Robert M, Jr. (2004) "Global Climate and the Evolution of Large Mammalian Carnivores during the Later Cenozoic in North America" July 20, 2007, at the Wayback Machine in Cenozoic Carnivores and Global Climate by Robert M. Hunt, Jr. Bulletin of the American Museum of Natural History (285) 139-285
- ^ M. Morlo, E. R. Miller, and A. N. El-Barkooky. 2007. Creodonta and Carnivora from Wadi Moghra, Egypt. Journal of Vertebrate Paleontology 27(1):145-159
- ^ Sorkin, B. 2008: A biomechanical constraint on body mass in terrestrial mammalian predators. Lethaia, Vol. 41, pp. 333–347.
- ^ Jacobs, Louis L. Jacobs; Scott, Kathleen Marie: Evolution of Tertiary Mammals of North America: Terrestrial carnivores, Cambridge University Press, 1998
- ^ Wang, Xiaoming and Tedford, Richard H. Dogs: Their Fossil Relatives and Evolutionary History. New York: Columbia University Press, 2008. p10-11, 29
- ^ Hunt, R. M. Jr. (1998). "Amphicyonidae". In Janis, Christine M.; Scott, Kathleen M.; Jacobs, Louis L. (eds.). Evolution of Tertiary Mammals of North America, volume 1: Terrestrial carnivores, ungulates, and ungulatelike mammals. Cambridge, England: Cambridge University Press. pp. 196–227. ISBN 978-0-521-35519-3.
- ^ Sehgal, R. K. and A. C. Nanda (2002). "Age of the fossiliferous Siwalik sediments exposed in the vicinity of Nurpur, District Kangra, Himachal Pradesh". Current Science. 82 (4): 392–395. JSTOR 24106648.
- ^ Stéphane Peigné (2006). "A new amphicyonid (Mammalia, Carnivora, Amphicyonidae) from the late middle Miocene of northern Thailand and a review of the amphicyonine record in Asia". Thailand Journal of Asian Earth Sciences. 26 (5): 519–532. Bibcode:2006JAESc..26..519P. doi:10.1016/j.jseaes.2004.11.003.
- ^ Morlo, Michael; Bastl, Katharina; Habersetzer, Jörg; Engel, Thomas; Lischewsky, Bastian; Lutz, Herbert; von Berg, Axel; Rabenstein, Renate; Nagel, Doris (3 September 2019). "The apex of amphicyonid hypercarnivory: solving the riddle of Agnotherium antiquum Kaup, 1833 (Mammalia, Carnivora)". Journal of Vertebrate Paleontology. 39 (5): e1705848. doi:10.1080/02724634.2019.1705848. S2CID 214431583.
- ^ Morlo, Michael; Bastl, Katharina; Habersetzer, Jörg; Engel, Thomas; Lischewsky, Bastian; Lutz, Herbert; von Berg, Axel; Rabenstein, Renate; Nagel, Doris (3 September 2019). "The apex of amphicyonid hypercarnivory: solving the riddle of Agnotherium antiquum Kaup, 1833 (Mammalia, Carnivora)". Journal of Vertebrate Paleontology. 39 (5): e1705848. doi:10.1080/02724634.2019.1705848. S2CID 214431583.
- ^ Berger, Jean-Pierre (June 1998). "'Rochette' (Upper Oligocene, Swiss Molasse): a strange example of a fossil assemblage". Review of Palaeobotany and Palynology. 101 (1–4): 95–110. doi:10.1016/S0034-6667(97)00071-7.
- ^ a b c d e Fournier, Morgane; Ladevèze, Sadrine; Le Verger, Kévin; Fischer, Valentin; Speijer, Robert P.; Solé, Floréal (2020). "On the morphology of the astragalus and calcaneus of the amphicyonids (Carnivora, Mammalia) from the Paleogene of Europe: implications for the ecology of the European bear-dogs". Geodiversitas. 42 (18): 305–325. doi:10.5252/geodiversitas2020v42a18.
- ^ Solé, Floréal; Fischer, Valentin; Denayer, Julien; Speijer, Robert P.; Fournier, Morgane; Le Verger, Kévin; Ladevèze, Sandrine; Folie, Annelise; Smith, Thierry (2020). "The upper Eocene-Oligocene carnivorous mammals from the Quercy Phosphorites (France) housed in Belgian collections". Geologica Belgica. 24 (1–2): 1–16. doi:10.20341/gb.2020.006.
- ^ a b Jiangzuo, Q.; Wang, S.; et al. (September 2019). "New material of Gobicyon (Carnivora, Amphicyonidae, Haplocyoninae) from northern China and a review of Aktaucyonini evolution". Papers in Palaeontology. 7 (1): 307–327. doi:10.1002/spp2.1283. S2CID 204264754.
- ^ de Bonis, Louis (2020). "New genus of amphicyonid carnivoran (Mammalia, Carnivora, Amphicyonidae) from the phosphorites of Quercy (France)". Fossil Imprint. 76 (1): 201–208. doi:10.37520/fi.2020.013.
- ^ Morales, Jorge; Pickford, M.; Valenciano, Alberto (2016). "Systematics of African Amphicyonidae, with descriptions of new material from Napak (Uganda) and Grillental (Namibia)". Journal of Iberian Geology. 42 (2): 131–150. doi:10.13039/501100003329. hdl:10261/137042. ISSN 1698-6180.
- ^ Werdelin, Lars; Simpson, Scott W. (2009). "The last amphicyonid (Mammalia, Carnivora) in Africa". Geodiversitas. 31 (4): 775–787. doi:10.5252/g2009n4a775. ISSN 1280-9659. S2CID 73677723.
- ^ a b c Morales, Jorge; Pickford, Martin (2022). "The taxonomic status of "Ysengrinia" ginsburgi Morales et al. 1998 (Amphicyonidae, Carnivora) from the basal middle Miocene of Arrisdrift, Namibia" (PDF). Communications of the Geological Survey of Namibia. 24: 1–16 – via Google Scholar.
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- ^ Peign, Stphane; Salesa, Manuel J.; Antn, Mauricio; Morales, Jorge (2008). "A New Amphicyonine (Carnivora: Amphicyonidae) from the Upper Miocene of Batallones-1, Madrid, Spain". Palaeontology. 51 (4): 943–965. doi:10.1111/j.1475-4983.2008.00788.x. S2CID 55334897.
- ^ Morales, J.; Abella, J.; et al. (May 2021). "Ammitocyon kainos gen. et sp. nov., a chimerical amphicyonid (Mammalia, Carnivora) from the late Miocene carnivore traps of Cerro de los Batallones (Madrid, Spain)". Journal of Systematic Palaeontology. 19 (5): 393–415. doi:10.1080/14772019.2021.1910868. S2CID 235363054.
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External links
- Whence the beardogs? Reappraisal of the Middle to Late Eocene 'Miacis' from Texas, US, and the origin of Amphicyonidae