Sardinian dhole

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Sardinian dhole
Temporal range: Middle Pleistocene-Holocene
Cynotherium.png
Drawing of the skeleton of C. sardous scale bar = 20 cm
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Canidae
Subfamily: Caninae
Tribe: Canini
Genus: Cynotherium
Studiati, 1857
Type species
Cynotherium sardous
Studiati, 1857
Other species
  • Cynotherium malatestai Madurell-Malapeira, Palombo & Sotnikova, 2015
LocationSardinainLynx.png
Former range (in red)

The Sardinian dhole (genus Cynotherium especially C. sardous) is an extinct insular canid which was endemic to what is now the Mediterranean islands of Sardinia and Corsica during the Middle-Late Pleistocene. It went extinct at the end of the Pleistocene around the time of human settlement of the islands.

Contents

Its scientific name means "dog-beast of Sardinia", the genus name from the Ancient Greek : θήρ, romanized: thḗr, lit. 'beast', 'wild animal' and κύων, kyōn, 'dog' and the specific name from the Latin : Sardous, lit. 'of Sardinia', alt. form of Latin : Sardus.

Around the size of a jackal, morphological studies indicate it was a specialised stalking predator of small mammals and birds, with a probable preference for the endemic Sardinian pika.

Evolution

The oldest remains of Cynotherium on Sardinia date to around the early-Middle Pleistocene transition around 800,000 years ago, associated with a faunal turnover event on Sardinia likely caused low sea levels allowing dispersal to Sardinia-Corsica from mainland Italy. Cynotherium is suggested to have originated from the species Xenocyon lycaonoides of mainland Europe. Some of the older Cynotherium remains are assigned to the separate species Cynotherium malatestai, which is larger than C. sardous and shows intermediate features between it and X. lycaonoides. [1] A 2021 genetic study found that its closest living relative is the dhole, from which it diverged approximately 885,000 years ago. Unlike living dholes, it lacked introgressed DNA from the African wild dog lineage. [2]

Description

Skull of the Sardinian dhole (right) compared to its presumed ancestor Xenocyon lycaonoides Adaptations of the Pleistocene island canid Cynotherium sardous (2006) Fig. 3.png
Skull of the Sardinian dhole (right) compared to its presumed ancestor Xenocyon lycaonoides

C. sardous was relatively small in size, with a weight around 10 kilograms (22 lb), comparable to a jackal. [3] The skull is slender and wedge-shaped in lateral view. The snout is narrower than in extant dholes, but broader than those of foxes. The postorbital region of the skull is broad, and the zygomatic arches only modestly project outwards. The mastoid is very enlarged and projects outwards. The sagittal crest is weakly developed. The mandible is slender. [4] The attachment sites for the triceps on the scapula, ulna and humerus are large, indicating the muscle, along with the anconeus, was well developed. The scar for the deltoid muscle at the posterior of the deltoid ridge on the humerus is high, large and rugose, indicating this muscle was also well developed. [3] Analysis of its ear morpology, including the significant reduction in the number of cochlear turns, suggests a specialisation towards the hearing of high-frequency sounds, but suggests it was poor at detecting low frequency sounds, and completely unable to detect sounds lower than 250 Hz. [5]

Ecology

When the ancestor of this canid became confined to the island, its diet became limited to small prey. Cynotherium as a predator specializing in small, fast moving prey is supported by an examination of the animal's anatomy. The evolution of short, powerful limbs, a low neck carriage and increased head and neck mobility suggests an animal specialised for stalking low to the ground, and then quickly pouncing on or running down prey. [4] [3] A suggested preferred prey item of the Sardinian dhole is the Sardinian pika (Prolagus sardus), a large lagomorph that was also endemic and abundant on the island, with birds also being likely targets. [4]

Paleoenvironment

Life restoration Cynotherium sardous restoration.jpg
Life restoration

During the Middle and Late Pleistocene Corsica and Sardinia had their own highly endemic depauperate terrestrial mammal fauna which besides the Sardinian dhole and Sardinian pika, included the Tyrrhenian field rat, ( Rhagamys orthodon ) the Tyrrhenian vole ( Microtus henseli ), a shrew ( Asoriculus similis ), a mole ( Talpa tyrrhenica ), a dwarf mammoth (Mammuthuslamarmorai), a galictine mustelid ( Enhydrictis galictoides ), three species of otter ( Algarolutra majori, Sardolutra ichnusae, Megalenhydris barbaricina ) and a deer ( Praemegaceros cazioti ). [6]

Extinction

The youngest radiocarbon dates for the Sardinan dhole are around 11,500 years BC/13,500 years Before Present (BP), only a few thousand years before the first confirmed human presence on Sardian-Corsica around 8,000 BC/10,000 years BP, and it is assumed that the species was alive when humans arrived on the island. The causes of its extinction are uncertain. [7] The low genetic diversity of sampled individuals suggests that the population size had been small but stable for a long period of time prior to extinction. [2]

See also

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Canidae is a biological family of dog-like carnivorans, colloquially referred to as dogs, and constitutes a clade. A member of this family is also called a canid. The family includes three subfamilies: the Caninae, the extinct Borophaginae and Hesperocyoninae. The Caninae are known as canines, and include domestic dogs, wolves, coyotes, foxes, jackals and other species.

<span class="mw-page-title-main">Dhole</span> Species of mammal

The dhole is a canid native to Central, South, East and Southeast Asia. Other English names for the species include Asian wild dog, Asiatic wild dog, Indian wild dog, whistling dog, red dog, red wolf, and mountain wolf. It is genetically close to species within the genus Canis, but distinct in several anatomical aspects: its skull is convex rather than concave in profile, it lacks a third lower molar and the upper molars sport only a single cusp as opposed to between two and four. During the Pleistocene, the dhole ranged throughout Asia, Europe and North America but became restricted to its historical range 12,000–18,000 years ago.

<span class="mw-page-title-main">Sardinian pika</span> Extinct species of mammal

The Sardinian pika is an extinct species of lagomorph that was endemic to the islands of Sardinia, Corsica and neighbouring Mediterranean islands until its extinction likely in Roman times. It was last surviving member of Prolagus, a genus of lagomorph once widespread throughout Europe during the Miocene and Pliocene epochs, whose closest living relatives are pikas of the genus Ochotona.

<i>Myotragus</i> Extinct genus of mammals

Myotragus is an extinct genus of goat-antelope in the tribe Caprini which lived on the Balearic Islands of Mallorca and Menorca in the western Mediterranean until its extinction around 4,500 years ago. The fossil record of Myotragus on the Balearic Islands extends over 5 million years back to the early Pliocene on Mallorca, where it presumably arrived after the evaporation of the Mediterranean Sea during the Messinian Salinity Crisis.

<i>Palaeoloxodon falconeri</i> Extinct species of elephant

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Mammuthus lamarmorai is a species of mammoth which lived during the late Middle and Late Pleistocene on the island of Sardinia in the Mediterranean. M. lamarmorai is a dwarf species, as it is estimated to have reached a shoulder height of only 1.4 metres (4.6 ft). It has been found mostly in the fine-grained sediments of the western part of the island.

<span class="mw-page-title-main">Caninae</span> Subfamily of carnivores

The Caninae, known as canines, are one of three subfamilies found within the canid family. The other two canid subfamilies are the extinct Borophaginae and Hesperocyoninae. The Caninae includes all living canids and their most recent fossil relatives. Their fossils were first found in North America and dated to the Oligocene era, then spreading to Asia at the end of the Miocene era, some 7 million to 8 million years ago.

<i>Asoriculus</i> Extinct genus of red-toothed shrew

Asoriculus is an extinct genus of terrestrial shrews in the subfamily Soricinae and tribe Nectogalini, native to Europe and North Africa.

<i>Prolagus</i> Extinct genus of mammals

Prolagus is an extinct genus of lagomorph. Over 20 species have been named, and the genus was abundant and widespread in Europe during the Neogene. However, by the end of the Middle Pleistocene, it was confined to a single species, the Sardinian pika, on the Corsica, Sardinia, and surrounding islands, where it survived into historical times. In North Africa and Western Asia, the genus is known from the Miocene and Pliocene. The scientific name may mean "before hares" or "primitive hares". Its taxonomy is disputed, with it either being considered a member of the family Ochotonidae, which includes living pikas, or the only member of the family Prolagidae.

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Megalenhydris barbaricina is an extinct species of giant otter from the Late Pleistocene of Sardinia. It is known from a single partial skeleton, discovered in the Grotta di Ispinigoli near Dorgali, and was described in 1987. It was larger than any living otter, exceeding the size of South American giant otters (Petrolutra), which can reach two meters in length. The species is one of four extinct otter species from Sardinia and Corsica. The others are Algarolutra majori, Lutra castiglionis and Sardolutra ichnusae. It is suggested to have ultimately originated from the much smaller European mainland species "Lutra" simplicidens, which may be more closely related to Lutrogale than to modern Lutra species. The structure of the teeth points to a diet of bottom dwelling fish and crustaceans. A special characteristic of the species is the flattening of the first few caudal vertebrae. This might point to a slightly flattened tail.

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<i>Rhagamys</i> Extinct rodent genus

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<i>Talpa tyrrhenica</i> Extinct species of mammal

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References

  1. Madurell-Malapeira, Joan; Palombo, Maria Rita; Sotnikova, Marina (2015-07-04). "Cynotherium malatestai, sp. nov. (Carnivora, Canidae) from the early middle Pleistocene deposits of Grotta dei Fiori (Sardinia, Western Mediterranean)". Journal of Vertebrate Paleontology. 35 (4): e943400. doi:10.1080/02724634.2014.943400. ISSN   0272-4634. S2CID   129741290.
  2. 1 2 Ciucani, Marta Maria; Jensen, Julie Kragmose; Sinding, Mikkel-Holger S.; Smith, Oliver; Lucenti, Saverio Bartolini; Rosengren, Erika; Rook, Lorenzo; Tuveri, Caterinella; Arca, Marisa; Cappellini, Enrico; Galaverni, Marco; Randi, Ettore; Guo, Chunxue; Zhang, Guojie; Sicheritz-Pontén, Thomas (December 2021). "Evolutionary history of the extinct Sardinian dhole". Current Biology. 31 (24): 5571–5579.e6. doi:10.1016/j.cub.2021.09.059. hdl: 2158/1252046 . PMID   34655517. S2CID   238996621.
  3. 1 2 3 Lyras G.; Van der Geer A. (2006). "Adaptations of the Pleistocene island canid Cynotherium sardous (Sardinia, Italy) for hunting small prey". Cranium. 23 (1): 51–60. PDF copy
  4. 1 2 3 Lyras G.A.; Van der Geer A.E.; Dermitzakis M.; De Vos J. (2006). "Cynotherium sardous, an insular canid (Mammalia: Carnivora) from the Pleistocene of Sardinia (Italy), and its origin". Journal of Vertebrate Paleontology. 26 (3): 735–745. doi:10.1671/0272-4634(2006)26[735:CSAICM]2.0.CO;2. S2CID   84448363.
  5. Zedda, Marco; Brunetti, Antonio; Palombo, Maria Rita (2022-03-25). "First Attempt to Infer Sound Hearing and Its Paleoenvironmental Implications in the Extinct Insular Canid Cynotherium sardous Studiati, 1857 (Sardinia, Italy)". Animals. 12 (7): 833. doi: 10.3390/ani12070833 . ISSN   2076-2615. PMC   8996844 . PMID   35405823.
  6. Palombo, Maria Rita; Rozzi, Roberto (April 2014). "How correct is any chronological ordering of the Quaternary Sardinian mammalian assemblages?". Quaternary International. 328–329: 136–155. Bibcode:2014QuInt.328..136P. doi:10.1016/j.quaint.2013.09.046.
  7. Valenzuela, Alejandro; Torres-Roig, Enric; Zoboli, Daniel; Pillola, Gian Luigi; Alcover, Josep Antoni (March 2022). "Asynchronous ecological upheavals on the Western Mediterranean islands: New insights on the extinction of their autochthonous small mammals". The Holocene. 32 (3): 137–146. Bibcode:2022Holoc..32..137V. doi:10.1177/09596836211060491. ISSN   0959-6836. S2CID   244763779.