Peignecyon
| Peignecyon Temporal range: Early Miocene
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Carnivora |
| Family: | †Amphicyonidae |
| Subfamily: | †Thaumastocyoninae |
| Genus: | †Peignecyon Morales et al. 2019 |
| Type species | |
| †Peignecyon felinoides Morales et al. 2019
| |
Peignecyon is an extinct genus of large carnivorans belonging to the family Amphicyonidae (known colloquially as "bear-dogs"). It belongs to the subfamily Thaumastocyoninae, which is characterized by their adaptions towards hypercarnivory. Whereas most other thaumastocyonines are often only known from fragmentary remains and isolated teeth, Peignecyon is known from a variety of well-preserved remains. It contains a single species, P. felinoides from the Early Miocene of the Czech Republic.
History
[edit]Remains later referred to this taxon were first mentioned in a 2003 review of the mammals of Tuchořice by Fejfar et al., who considered it to be a new species of Tomocyon.[1] A summary of the Carnivorans of the locality by the same lead author in 2016 suggested that these fossils may represent a new genus.[2] It was finally described in 2019, with a right mandible (NM-Pv 11600), with several preserved teeth, serving as the holotype. Several more mandibles, as well as isolated teeth, are also known. At the time of the publication, it was the most completely known thaumastocyonine, though more complete remains have since been recovered.[3]
The genus name honors Stéphane Peigné, while the species name references the cat-like features typical of the subfamily.[3]
Phylogeny
[edit]Peignecyon is an intermediate genus of thaumastocyonines, showing several features more derived than those of earlier taxa such as Ysengrinia and Crassidia, though less developed than in the youngest known members of the subfamily, such as Ammitocyon. It has been suggested that it derives from one of the numerous species of Ysengrinia.[4]
Below is the cladogram based on cranial, mandibular and dental characters, after Morales et al., 2021:[5]
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Description
[edit]
The mandible of this taxon is quite similar to that of a wolf, but shorter and more robust. Albeit its morphology still resembles that of the Amphicyoninae, Peignecyon shows clear adaptions towards hypercarnivory, which are more developed than in earlier thaumastocyonines such as Ysengrinia. The most notable of these is the long diastema, which is associated with the reduction of the second and third lower premolars. The fourth premolar has a distally inclined, high protoconid, but it is small compared to the first molar. The short talonid of the latter is dominated by the hypoconid, and is of similar width to the trigonid. The mesial cristids of the protoconid, paraconid, and the strongly developed hypoconid are aligned to form the carnassial blade. The metaconid is strongly diminished. All these features show that it possessed moderately sectorial carnassials. Both the lower and upper second molar are reduced in size, with the lower one having a quadrangular shape. The m3 is even smaller than the m2. The lingual area of the M1 is also strongly reduced, a feature typical of more derived members of the subfamily. Its canine is well-developed, with a sharp distal cristid.[3] The shortening of the rostrum and the reduction of the premolars in thaumastocyonines is reminiscent of felids.[6]
The body mass of this species has been estimated at 110 kg.[7]
Paleoecology
[edit]Peignecyon has so far only been discovered at Tuchořice, an early Miocene locality which dates to MN3. The site preserves a riparian forest dominated by maples. Date palms and lianas also occur, indicating a warm climate, in which temperatures did not fall under 18°C. Hot minerals springs shaped the site, at which an abundant amount of fossils belonging to various carnivorans were found. This can likely be explained by the 'trapping effect': Predators were attracted to the carcasses of herbivores killed by the gases released by the mineral springs, only to succumb to the carbon dioxide themselves.[1] Besides Peignecyon, three more amphicyonids were discovered: the large amphicyonines Paludocyon bohemicus and Amphicyon carnutense, and the small Dehmicyon schlosseri. Other carnivorans include the small ursids Ballusia and Ursavus, as well as the larger Hemicyon, the viverrid Semigenetta and a variety of mustelids and procyonids.[2] Among the larger mammals are three species of rhinoceros, belonging to the genera Prosantorhinus, Protaceratherium and Aceratherium.[8] Other herbivores include chalicotheres, the suid Aureliachoerus, the anthracothere Brachyodus, and the ruminants Palaeomeryx, Lagomeryx, and Amphitragulus. The small-mammal assemblage is dominated by sciurids, but various eomyids, glirids, shrews, and beavers are also present. Non-mammalian fossils include abundant turtle remains, and various accipitrids, the latter of which were likely met their demise due to the same 'trapping effect' as their mammalian counterparts.[1][9]
References
[edit]- ^ a b c Fejfar, O.; Dvorák, Z.; Kadlecová, E. (2003-01-01). "New record of Early Miocene (MN3a) mammals in the open brown coal pit Merkur, North Bohemia, Czech Republic". Deinsea. 10 (1): 163–182. ISSN 2468-8983.
- ^ a b Fejfar, Oldřich; Heizmann, Elmar (2015). "An illustrated summary of the lower Miocene carnivores (Mammalia, Carnivora) of Tuchořice, Czech Republic". Historical Biology. 28 (1–2): 316–329. doi:10.1080/08912963.2015.1029923. ISSN 0891-2963.
- ^ a b c Morales, J., Fejfar, O., Heizmann, E., Wagner, J., Abella, J., Valenciano, A. (2019): A new Thaumastocyoninae (Amphicyonidae, Carnivora) from the early Miocene of Tuchořice Czech Republic. – Fossil Imprint 75: 397–411. https://doi.org/10.2478/if-2019-0025
- ^ Morlo M, Bastl K, Habersetzer J, Engel T, Lischewsky B, Lutz H, von Berg A, Rabenstein R, Nagel D. 2020. 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.
- ^ Jorge Morales, Juan Abella, Oscar Sanisidro & Alberto Valenciano (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
- ^ Jasinski, Steven E.; Abbas, Sayyed Ghyour; Mahmood, Khalid; Babar, Muhammad Adeeb; Khan, Muhammad Akbar (2023-11-02). "New Carnivoran (Mammalia: Carnivora) specimens from the Siwaliks of Pakistan and India and their faunal and evolutionary implications". Historical Biology. 35 (11): 2217–2252. doi:10.1080/08912963.2022.2138376. ISSN 0891-2963.
- ^ Gusti, J. & Antón, M. (2002): Mammoths, Sabertooths, and Hominids – 65 Million Years of Mammalian Evolution in Europe. – Columbia University Press. New York.
- ^ Kurt Heissig und Oldřich Fejfar: Die fossilen Nashörner (Mammalia, Rhinocerotidae) aus dem Untermiozän von Tuchorice in Nordwestböhmen. Sborník Národního Muzea v Praze (Acta Musei Nationalis Pragae series B, Natural History) 63 (1), 2007, S. 19–64
- ^ Mlíkovský, Jiří (2002). "Early Miocene birds of Tuchořice, Czech Republic" (PDF). Journal of the National Museum (Prague), Natural History Series. 171 (1–4): 117–120.
