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Canis arnensis
Temporal range: Early Pleistocene 1.9-1.6 Ma
Canis arnensis reconstruction from fossilized bone fragments
Artist's rendition
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Canidae
Genus: Canis
Species:
†C. arnensis
Binomial name
†Canis arnensis
Del Campana, 1913[1]
Synonyms[4]
  • C. senezensis Martin, 1973[2]
  • C. accitanus Garrido and Arribas, 2008[3]

Canis arnensis, is an extinct species of canine that was endemic to Mediterranean Europe during the Early Pleistocene. Canis arnensis has been described as a small jackal-like canid. Its anatomy and morphology relate it more to the modern golden jackal (Canis aureus) than to the larger Etruscan wolf of that time. It is probably the ancestor of modern jackals.

Taxonomy

[edit]

The fossil record for ancient vertebrates is composed of rarely occurring fragments from which it is often impossible to obtain genetic material. Researchers are limited to morphologic analysis, but it is difficult to estimate the intraspecies and interspecies variations and relationships that existed between specimens across time and place. Some observations are debated by researchers who do not always agree and hypotheses that are supported by some authors are challenged by others.[5] Several species of Caninae from the Pleistocene of Europe have been described. Most of their systematic and phylogenetic relationships have not been resolved because of their similar morphology.[6]

Upper Valdarno is the name given to that part of the Arno Valley situated in the provinces of Florence and Arezzo, Italy. The region is bounded by the Pratomagno mountain range to the north and east and by the Chianti Mountains to the south and west. The Upper Valdarno Basin has provided the remains of three fossil canid species dated to the Late Villafranchian era of Europe 1.9-1.8 million years ago that arrived with a faunal turnover around that time. The Swiss paleontologist Charles Immanuel Forsyth Major discovered two species in this region, these being the Falconer's wolf (Canis falconeri Forsyth Major 1877) that was later reclassified as Lycaon falconeri, and the smaller Etruscan wolf (C. etruscus Forsyth Major 1877).[7] Forsyth Major did not publish a complete description of the Etruscan wolf,[6] and later Domenico Del Campana worked on expanding Forsyth Major's descriptions when he recognized among the specimens a smaller, jackal-sized species.[6] This he named Canis arnensis Del Campana 1913 in honour of the nearby Arno River.[6][7][8]

Canis senezensis

[edit]

C. senezensis (Martin 1973)[2] is represented by two maxillary bone fragments. This medium-sized canid was discovered in Senez, France and dated 2.1-2.0 million years ago. In 2011, a study compared all of the 55 Early Pleistocene wolf-like specimens found across Europe and found that their morphometric variation was no different than that of modern wolf populations, with their difference in size representing male and female specimens. However, the study proposed two lineages. One lineage is C. arnensis which includes C. accitanus and C. senezensis, and the other lineage being C. etruscus that includes C. appoloniensis.[4]

Canis accitanus

[edit]

A later study based on better-quality specimens of C. arnensis found the proportions and dental morphology of C. senezensis to be close and supported C. senezensis to be an early form of C. arnensis, however it disputed that C. accitanus was close to C. arnensis.[7] Its taxonomic status remains disputed.

Lineage

[edit]

Canis arnensis has been described as a small jackal-like canid[1][9] because of the relative length of its upper molars M1 and M2.[9] The Finnish paleontologist Björn Kurtén described it as coyote-like[10] and not similar to the gray wolf (C. lupus) but similar to the early coyote-like C. priscolatrans. Kurten was uncertain if C. priscolatrans derived from C. lepophagus through C. arnensis,[11] but believed that C. priscolatrans was a population of large coyotes that were ancestral to Rancholabrean and recent C. latrans. He noted that C. arnensis of Europe showed striking similarities to C. priscolatrans, and they could represent what once was a Holarctic population of coyotes.[12]

In 1993, the Italian paleontologist Lorenzo Rook identified a new taxon dating from the end of the Villafranchian. It was found at the Mediterranean sites of Venta Micena, Pirro Nord, Le Vallonet, Cueva Victoria, Huescar-1, Colle Curti, Cúllar de Baza-1, L’Escale, Petralona, and the Israeli site of Oubeidiyah. The taxon was named Canis aff. arnensis as it was assessed as an advanced form of C. arnensis. In 1996, Rook and the Italian paleontologist Danilo Torre propose that during the Lower Pleistocene to Mid Pleistocene transition, Europe was home to two different lineages. In the Mediterranean areas existed the lineage of C. arnensis (primitive form) that gave rise to C. aff. arnensis (advanced form). In Central and northern Europe existed the lineage of C. etruscus that gave rise to C. mosbachensis.[3]

In 2016, a study looked at previously undescribed specimens of C. arnensis from the Poggio Rosso site located in the northeastern Upper Valdarno and dated 1.9-1.8 million years ago. There was little deformation in these fossils which allowed a more defined assessment of the morphology of the species. The study found that the phylogenetic position of Canis arnensis is not resolved. Its anatomy and morphology relate it more to the modern golden jackal (C. aureus)[7][13] than to the ancient Etruscan wolf (C. etruscus). Although the Etruscan wolf was the first of the genus Canis to reach Europe around 2.2 million years ago, Canis arnensis was the first of the more modern canids to arrive in Europe around 1.9 million years ago.[7] It is probably the ancestor of modern jackals.[14]

Description

[edit]
Canis arnensis skull at the Museum of Paleontology in Florence, Italy
Canis arnensis skull (profile view) at the Museum of Paleontology in Florence, Italy

C. arnensis was a medium-sized canid, with a close affinity to modern canids.[7] It had a slightly smaller cranial length than both C. etruscus and the extant C. lupus. C. arnensis featured a lower and more pronounced forehead, with less-developed sagittal and nuchal crests and a bulkier braincase than C. etruscus; in addition, the nasal bones were found to be shorter, stopping short of the maxillofrontal suture.[6]

C. arnensis and C. etruscus have been compared, as they are morphologically similar and are believed to have spread to Western Europe together during the so-called "Canis Event".[7] Morphometric analysis of the cranium and upper teeth show that both C. arnensis and C. etruscus showed characteristics of an intermediate between extant wolves and jackals, with C. arnensis being slightly more jackal-like and C. etruscus slightly more wolf-like; however, in some cranial characteristics, C. arnensis is more wolf-like.[6]

Paleoecology

[edit]

The dispersal of carnivoran species occurred approximately 1.8 million years ago and this coincided with a decrease in precipitation and an increase of annual seasonality which followed the 41,000 year amplitude shift of Milankovitch cycles. First to arrive was C. etruscus, which was immediately followed by C. arnensis and Lycaon falconeri and then by the giant hyena (Pachycrocuta brevirostris). These were all better adapted to open, dry landscapes than the two more primitive canini Eucyon and Nyctereutes that they replaced in Europe.[15]

Range

[edit]
Canis arnensis is located in Mediterranean
Canis arnensis
Canis arnensis
Canis arnensis
Canis arnensis
Canis arnensis
Canis arnensis
Canis arnensis
Canis arnensis
Canis arnensis
Canis arnensis
class=notpageimage|
Distribution of C. arnensis fossils ("advanced form" fossils in dark red).[16]

The first identification of C. arnensis followed the discovery of a fossil in the Upper Valdarno. Fossils of the species have only been found in the period of time known as the Tasso Faunal Unit of Italy.[7] The species was endemic to Mediterranean Europe and lived during the Early Pleistocene era.[8] It is believed that C. arnensis spread across Europe as the result of a dispersal event which populated the continent with the first modern canids. The species arrived in Italy around 1.9 Ma[7] and was homogenized across southern Europe during the late Villafranchian.[17]

Extinction

[edit]

Canis arnensis and the Etruscan wolf both disappeared from the fossil record in Italy after the end of the Tasso Faunal Unit and were replaced by the mid-Pleistocene era Mosbach wolf (C. mosbachensis Soergel, 1925) by 1.5 million years ago.[7]

See also

[edit]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Canis arnensis

View on Grokipedia
from Grokipedia
Canis arnensis, commonly known as the River dog, is an extinct of medium-sized canine endemic to Mediterranean during the epoch, approximately 2.0 to 1.6 million years ago. This jackal-like canid, first described by Del Campana in , exhibits morphological features such as a well-developed , inflated tympanic bullae, and diastemata between the canine and premolars, distinguishing it from earlier Pleistocene canids and aligning it more closely with modern forms like coyotes. The is primarily known from fossil remains in , particularly the Upper Valdarno Basin in , where the type specimen—a deformed and mandibles—was recovered from late Villafranchian deposits around 1.9 million years old. Fossil evidence indicates that C. arnensis arrived in Italy via a dispersal event from Eurasia, with Poggio Rosso representing the earliest confirmed Italian locality for the species, dated to about 1.9–1.8 million years ago. Morphometric analyses of its dentition and cranium position it as a distinct lineage near jackal-like canids and the North American Canis lepophagus, separate from the wolf lineage leading to Canis lupus. Notable cranial traits include short nasals that do not extend beyond the maxillo-frontal suture, an enlarged upper third incisor with a posteromedial cingulum, and a lingually projecting protocone on the upper fourth premolar. Recent virtual reconstructions using advanced 3D modeling have corrected distortions in the lectotype specimen, providing clearer insights into its anatomy and ecological role as a small- to medium-sized predator in diverse Western European mammal assemblages. The species' distribution extended beyond Italy to other parts of Mediterranean and possibly , though remains are fragmentary and less abundant outside Tuscan sites. As a representative of the Villafranchian canid diversification, C. arnensis highlights the faunal turnover during the , bridging archaic and more derived canine forms in a period of climatic and environmental shifts. Its extinction around 1.6 million years ago, by the end of the , underscores the dynamic evolution of the genus Canis in response to changing ecosystems across .

Taxonomy

Discovery and naming

Canis arnensis was originally described by Italian paleontologist Domenico Del Campana in , based on specimens recovered from the Upper Valdarno basin in , . Del Campana's description appeared in his I cani pliocenici della Toscana, where he identified the species as a small- to medium-sized canid distinct from contemporary wolves. The type specimen, designated as lectotype IGF 867 by Daniele Torre in , comprises a partial cranium with both hemimandibles (the right one fragmentary) and complete ; it originates from the locality of Il Tasso within the Arno River Valley and dates to approximately 1.8 million years ago during the late Villafranchian stage of the . The specific epithet arnensis is derived from Latin, meaning "of the ," in reference to the Arno River that traverses the Upper Valdarno basin where the fossils were found. This initial identification occurred amid early 20th-century paleontological efforts in Mediterranean , particularly in Italy's Northern Apennines, where systematic excavations in deposits like those of the Upper Valdarno yielded rich vertebrate assemblages and advanced understandings of continental faunas. Key early sites associated with C. arnensis include Poggio Rosso in the Upper Valdarno (~1.9 Ma) and other contemporaneous Villafranchian localities in , which provided additional cranial and postcranial material supporting Del Campana's description. In a recent advancement, a 2024 study employed high-resolution CT scans and thin-plate spline interpolation via the Target Deformation method to virtually reconstruct the type specimen IGF 867, correcting taphonomic distortions and yielding a symmetrized 3D model (IGF 867_W) that enhances morphological comparisons with other early Pleistocene canids.

Synonyms and classification

Canis arnensis was originally named by Del Campana in 1913 based on fossil remains recovered from the Upper Valdarno Basin in Italy. Over the subsequent decades, additional fossil material from various European sites led to the proposal of several junior synonyms for this species. Notably, Canis senezensis was erected by Martin in 1973 to accommodate small canid fossils from the Senèze locality in France, dated to approximately 2.0 Ma. Similarly, Canis accitanus was described by Garrido and Arribas in 2008 for a partial cranium from the Fonelas P-1 site in southern Spain, representing one of the smallest known European Canis species at around 1.8 Ma. A comprehensive taxonomic revision by Brugal and Boudadi-Maligne in 2011 synonymized both C. senezensis and C. accitanus under C. arnensis, based on overlapping morphometric ranges in dental and cranial features, such as upper P4 and lower M1 dimensions. This classification places C. arnensis firmly within the genus Canis (family Canidae, order Carnivora), characterized as a medium- to small-sized canid adapted to Early Pleistocene environments in Mediterranean Europe. Ongoing taxonomic debates center on whether C. arnensis constitutes a single widespread or encompasses regional variants that might warrant status, given the observed morphological variability across sites. These discussions are constrained by the reliance on morphological data—primarily postcranial and dental metrics—owing to the lack of preserved in these fossils, which precludes genetic analyses. Within the broader phylogeny of , C. arnensis is positioned as an early divergent member of the Canis lineage, morphologically distinct from contemporaneous larger wolf-like forms such as through its narrower muzzle, reduced , and overall smaller body size.

Evolutionary history

Phylogenetic position

Canis arnensis is recognized as an early diverging member of the genus Canis, positioned basally within the Canis sensu lato clade and exhibiting closer affinities to the jackal-coyote group than to modern gray wolves (Canis lupus). Morphological analyses place it at the base of a clade encompassing other fossil Canis species, distinct from more derived wolf-like forms. Its cranial morphology, characterized by jackal-like features such as relatively slender proportions and dental traits, suggests it as a possible ancestor or sister taxon to the golden jackal (Canis aureus). The species shows links to North American canids through Laurasian dispersal events that facilitated the spread of early Canis lineages from North America to Eurasia during the Pliocene-Pleistocene transition. This connection is supported by shared mesocarnivorous adaptations and similar postcranial proportions, indicating C. arnensis as a Eurasian representative of this transcontinental radiation, with debated affinities to coyote-like forms such as Canis lepophagus and Canis priscolatrans. Recent studies suggest closer ties to jackal-like canids, while others propose relations to North American C. lepophagus, highlighting unresolved phylogenetic placement. Phylogenetic reconstructions based on morphological data from 2016 analyses confirm its basal position within the European radiation, forming a transitional link between earlier stem-canids and later diversified lineages. However, the lack of genetic material from C. arnensis fossils contributes to ongoing uncertainties, with some total-evidence studies proposing it as a stem-canid that bridges and clades, while others highlight in early . These debates underscore the need for further integrative analyses to resolve its exact placement.

Migration and lineage

The genus Canis likely originated in during the to Earliest , subsequently dispersing to in the before reaching around 2.0–1.9 million years ago (Ma) during the late /early transition, with C. arnensis representing an early n offshoot. This dispersal event, part of the broader " event" or " event," marked the immigration of the first modern wolf-like canids into western , correlating with significant faunal turnovers in Mediterranean bioprovinces. The key dispersal into is evidenced by records from (Senèze, ~2.2–2.1 Ma) as the earliest known occurrence, followed by the arrival of C. arnensis in approximately 1.9 Ma, representing the earliest Italian record of a small-sized Canis species. Fossil evidence from sites such as Poggio Rosso in (ca. 1.9–1.8 Ma) and the Upper Valdarno Basin confirms this timing, with additional records from indicating a rapid spread across during the late Villafranchian stage. These occurrences align with biostratigraphic units like the Olivola faunal unit, highlighting the species' role in early mammalian renewals. In its evolutionary lineage, C. arnensis formed an early wave of immigration into , characterized by jackal- or coyote-like traits and basal position within Canis sensu lato, with phylogenetic ties to coyote-like ancestors such as . The species persisted through the late Villafranchian (1.9–1.6 Ma) before being succeeded by larger forms, including around 1.5 Ma, which occupied similar niches in the subsequent Middle Pleistocene. This succession reflects ongoing diversification and niche partitioning among Eurasian canids.

Description

Physical morphology

Canis arnensis exhibits distinctive cranial morphology characterized by short that do not extend beyond the maxillofrontal suture, a low , enlarged rounded zygomatic processes, and a robust structure. Additional diagnostic features include a well-developed , inflated tympanic bullae, diastemata between the canine and premolars, an enlarged upper third with a posteromedial cingulum, and a lingually projecting protocone on the upper fourth . The braincase is notably bulky, featuring a wide postorbital , which suggests adaptations for enhanced in its environment. Dentition in C. arnensis includes well-developed teeth, such as the upper fourth (P4) and lower first molar (M1), optimized for shearing and indicative of a hypercarnivorous diet. These dental features align with modern canid affinities, showing precise occlusal patterns that facilitate efficient processing. Postcranial remains, including limb bones from partial skeletons, reveal an agile build with proportions suggesting moderate adaptations suited to open terrains. These elements indicate a frame, enabling swift and maneuverable locomotion distinct from more robust contemporary canids. A virtual reconstruction of the type specimen (IGF 867) utilized target deformation techniques to restore the deformed , revealing morphological traits resembling jackal-like canids, as evidenced by of cranial metrics. This restoration highlights the species' position near basal jackal-like forms in the lineage, with a bulky braincase. preservation poses challenges, with most specimens being fragmentary and primarily consisting of dentognathic elements affected by taphonomic deformation, including sagittal flattening and plastic distortion that obscure full anatomical reconstruction. Sites like Poggio Rosso yield relatively well-preserved partial skeletons with minimal deformation, yet comprehensive body reconstructions are limited by the scarcity of complete postcrania. Evidence for sexual dimorphism in C. arnensis is minimal due to the fragmentary nature of fossils, though slight size variations in canine teeth hint at possible gender-related differences, akin to patterns in modern golden jackals.

Size and comparisons

Canis arnensis was a medium-sized canid, with estimated body weights ranging from 15 to 20 kg based on skeletal proportions similar to those of modern coyotes (Canis latrans). Cranial measurements from fossils at Poggio Rosso, , show lengths of approximately 150–170 mm, notably shorter than the ~200 mm average for the co-occurring Canis etruscus. In comparisons, C. arnensis appears smaller and more gracile than C. etruscus, exhibiting wolf-like robustness to a lesser degree while sharing proportions with the coyote or golden jackal (Canis aureus). A 2016 analysis of Poggio Rosso specimens confirmed these jackal-like traits through postcranial ratios indicating relatively longer legs for its body size, contrasting the sturdier build of C. etruscus. Dental metrics further highlight this distinctiveness, with upper fourth premolar (P4) lengths around 25 mm, supporting a less robust carnassial apparatus suited to versatile feeding. These size characteristics likely enabled C. arnensis to occupy an opportunistic predatory niche, distinct from the larger, more specialized C. etruscus.

Distribution and paleoecology

Geographic range

Canis arnensis was endemic to during the , with its known distribution confined to southern and western regions of the continent, spanning from and to and extending eastward to . The species' range reflects adaptation to warm-temperate zones, with no evidence reported from , where cooler climates prevailed during the late to . records derive primarily from approximately 20 localities, including karstic fissures and fluvial deposits, dating from the late to early Calabrian stages (ca. 2.2–1.6 Ma). In , the core of the ' range, C. arnensis is documented from multiple sites in the Upper Valdarno Basin, , such as Poggio Rosso (ca. 1.9 Ma), Il Tasso (ca. 1.8 Ma), and Olivola, marking the earliest confirmed records around 1.9 Ma following an initial dispersal event. Additional Italian localities include Coste San Giacomo (ca. 2.2–2.1 Ma) and Frattaguida. To the west, fossils occur in at Sénèze in the (ca. 2 Ma) and potentially earlier at Vialette (ca. 3.0 Ma, though attribution requires confirmation). In , the species is represented at Fonelas P-1 in the Guadix Basin, (ca. 1.9–1.7 Ma), with a 2025 study confirming its presence ca. 2.05 Ma (range 2.128–1.945 Ma) and synonymizing the previously described Canis accitanus with C. arnensis, extending the known range southward before 2 Ma. The eastern extent of C. arnensis' distribution reached during the late Villafranchian, with records from sites in Macedonia such as Gerakarou, Apollonia-1 ( Basin), and Petralona. These Greek localities, dated to the Villafranchian-Villanyian transition, were first documented in pre-2014 studies, including analyses of material from Gerakarou confirming the species' presence in the . This expansion likely occurred during the late Villafranchian (ca. 1.9–1.7 Ma), aligning with broader canid dispersals across .

Habitat and ecology

Canis arnensis inhabited open, dry woodlands and grasslands across the Mediterranean region of during the , particularly within the late Villafranchian stage (approximately 2.0–1.6 Ma). These environments were characterized by fluvial systems and floodplains in areas such as the Upper Valdarno Basin in and the Guadix-Baza Basin in , reflecting a landscape of increasing aridity and progressive cooling that marked the transition from the . The species was closely associated with Villafranchian faunal assemblages, which included a mix of browsing and grazing herbivores indicative of savanna-like conditions with patches of woodland. The diet of C. arnensis is reconstructed as primarily mesocarnivorous, based on ecomorphological analyses of its dental and mandibular morphology, including ratios such as relative depth and trigonid length. These features suggest it targeted small to medium-sized prey, such as ungulates including gazelle-like antelopes and early equids that were abundant in its , supplemented by opportunistic scavenging or consumption of smaller vertebrates. morphology, with a relatively reduced entoconid on the m1 and positioned hypocone on the M1, further supports a diet leaning toward hypercarnivory compared to some contemporaries, though overall adaptations indicate flexibility similar to modern . In its ecosystem, C. arnensis coexisted with large carnivores such as the giant Pachycrocuta brevirostris and the hunting dog Xenocyon falconeri (formerly Lycaon falconeri), as well as the sympatric wolf-like , within diverse carnivoran guilds. Niche partitioning likely occurred, with C. arnensis filling a role focused on smaller prey to reduce competition from the more hypercarnivorous C. etruscus. Paleoecological studies, drawing on faunal associations and environmental proxies from sedimentary contexts, imply adaptations to seasonal in arid steppes, supported by its limb morphology suited for pursuing prey across open terrain.

Extinction

Timeline of disappearance

Canis arnensis first appeared around 1.9 million years ago (Ma) in the early Late Villafranchian of the , marking the initial dispersal of modern-grade canids into . The species persisted through the late Villafranchian and into the early Biharian stages, with a temporal span extending to approximately 1.6 Ma. Its biochronological range is defined by association with key mammals such as , which provides a framework for dating Early Pleistocene sites via biochronology. The last confirmed records of C. arnensis occur in Italian localities dated to around 1.6 Ma, including the Tasso Faunal Unit (FU) in (ca. 1.8–1.7 Ma). No fossils postdating 1.6 Ma have been reliably attributed to this species, indicating its abrupt disappearance from the fossil record. This absence is evident in stratigraphic sequences, where C. arnensis is present in late layers but entirely lacking in Middle Pleistocene deposits. The species' disappearance aligns with the faunal turnover at the end of the Villafranchian in , involving the replacement of Villafranchian canid lineages around 1.6 Ma. This event is corroborated by the first appearances of successor forms, such as , in contemporaneous assemblages.

Possible causes

The of Canis arnensis, an canid adapted to open, steppe-like habitats as a jackal-like specialist, is attributed to multiple interacting factors during major faunal renewals around 1.6 Ma. Primary among these is , particularly niche displacement by the larger and more adaptable , which partially occupied the ecological role of C. arnensis following its disappearance from the fossil record after the Tasso Faunal Unit. This replacement reflects broader patterns of canid guild restructuring in , where C. mosbachensis and other wolf-like forms expanded into medium-sized predator niches previously held by C. arnensis. Climatic shifts during the transition from the Early to Middle Pleistocene also likely contributed, as cooling temperatures and increasing forest cover reduced suitable open-habitat environments favored by C. arnensis, contrasting with the expansive steppes that facilitated its initial dispersal around 2 Ma. Ecological pressures intensified this vulnerability, including heightened competition for carcasses from dominant hyenids like Pachycrocuta brevirostris and large felids such as Homotherium, alongside potential declines in prey availability due to ungulate community turnovers during the same period. Reviews of the sparse evidence emphasize niche displacement over direct predation as the dominant mechanism, with no indications of involvement given the pre-Homo timing of C. arnensis' decline. However, uncertainties persist due to the limited sample size of C. arnensis remains, primarily from Italian localities like the Upper Valdarno Basin, which complicates definitive attribution of causes and highlights contrasts with the persistence of related lineages in more variable modern ecosystems.

References

  1. https://www.nature.com/articles/s41598-024-53073-5
  2. https://www.sciencedirect.com/science/article/pii/S0277379116303493
  3. https://www.researchgate.net/profile/George-Koufos/publication/260656883_Canis_arnensis_DEL_CAMPANA_1913_from_the_Villafranchian_Villanyian_of_Macedonia_Greece/links/569664cd08ae1c427903c2f4/Canis-arnensis-DEL-CAMPANA-1913-from-the-Villafranchian-Villanyian-of-Macedonia-Greece.pdf
  4. https://www.rhinoresourcecenter.com/pdf_files/136/1363168897.pdf
  5. https://www.sciencedirect.com/science/article/abs/pii/S0277379116303493
  6. https://doi.org/10.1016/j.quaint.2011.01.029
  7. https://doi.org/10.1016/j.geobios.2008.05.002
  8. https://www.gbif.org/species/9661133
  9. https://www.cambridge.org/core/journals/netherlands-journal-of-geosciences/article/specimen-of-canis-cf-c-etruscus-mammalia-carnivora-from-the-middle-villafranchian-of-the-oosterschelde/1405C7C1BEDA8CC71971AAFCD5D9E410
  10. https://bioone.org/journals/bulletin-of-the-american-museum-of-natural-history/volume-2009/issue-325/574.1/Phylogenetic-Systematics-of-the-North-American-Fossil-Caninae-Carnivora/10.1206/574.1.full
  11. https://link.springer.com/article/10.1007/s10914-021-09591-4
  12. https://onlinelibrary.wiley.com/doi/abs/10.1111/zsc.12293
  13. https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/comptes-rendus-palevol2021v20a17.pdf
  14. https://doi.org/10.1016/j.quascirev.2016.09.005
  15. https://doi.org/10.1038/s41598-024-53073-5
  16. https://flore.unifi.it/retrieve/46a37a94-b74d-4d03-a547-1de19a221877/07_Bartolini-Lucenti%20et%20al_2025.pdf
  17. https://www.researchgate.net/publication/260656883_Canis_arnensis_DEL_CAMPANA_1913_from_the_Villafranchian_Villanyian_of_Macedonia_Greece
  18. https://www.researchgate.net/publication/308115403_A_review_on_the_Late_Villafranchian_medium-sized_canid_Canis_arnensis_based_on_the_evidence_from_Poggio_Rosso_Tuscany_Italy
  19. https://www.sciencedirect.com/science/article/abs/pii/S0277379121005229
  20. https://journals.openedition.org/quaternaire/969
  21. https://www.sciencedirect.com/science/article/abs/pii/S0277379116306059
  22. https://www.mdpi.com/2571-550X/7/2/27
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