Megalenhydris

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Megalenhydris
D2627 Megalenhydris.jpg
Photo of holotype in situ
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Mustelidae
Subfamily: Lutrinae
Genus: Megalenhydris
Willemsen & Maletesta, 1987
Species:
M. barbaricina
Binomial name
Megalenhydris barbaricina
Willemsen & Maletesta, 1987

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. [1] It was larger than any living otter, exceeding the size of South American giant otters (Petrolutra), which can reach two meters in length. [2] [3] The species is one of four extinct otter species from Sardinia and Corsica. The others are Algarolutra majori , Lutra castiglionis [4] and Sardolutra ichnusae . [5] It is suggested to have ultimately originated from the much smaller European mainland species "Lutra" simplicidens [5] , which may be more closely related to Lutrogale than to modern Lutra species. [6] The structure of the teeth points to a diet of bottom dwelling fish and crustaceans. [5] A special characteristic of the species is the flattening of the first few caudal vertebrae (the remainder of the caudal vertebrae are not known). This might point to a slightly flattened tail.

Contents

Paleoenvironment

During the Middle-Late Pleistocene Corsica and Sardinia had their own highly endemic depauperate terrestrial mammal fauna which besides Megalenhydris included the Tyrrhenian field rat, ( Rhagamys orthodon ) the Tyrrhenian vole ( Microtus henseli ), the Sardinian pika (Prolagus sardus), a shrew ( Asoriculus similis ), a mole ( Talpa tyrrhenica ), a dwarf mammoth ( Mammuthus lamarmorai ) the Sardinian dhole (Cynotherium sardous), a galictine mustelid ( Enhydrictis galictoides ), two other species of otter ( Algarolutra majori and Sardolutra ichnusae ) and a deer ( Praemegaceros cazioti ). [7]

Related Research Articles

<span class="mw-page-title-main">Otter</span> Subfamily of mammals (Lutrinae)

Otters are carnivorous mammals in the subfamily Lutrinae. The 13 extant otter species are all semiaquatic, aquatic, or marine, with diets based on fish and invertebrates. Lutrinae is a branch of the Mustelidae family, which also includes weasels, badgers, mink, and wolverines, among other animals.

<span class="mw-page-title-main">Sardinian pika</span>

The Sardinian pika is an extinct species of pika that was endemic to the islands of Sardinia, Corsica and neighbouring Mediterranean islands until its extinction likely in Roman times. Unlike living pikas, which all belong to the genus Ochotona, the Sardinian pika was the last surviving member of the genus Prolagus, a genus of pika once widespread throughout Europe and North Africa during the Miocene and Pliocene epochs.

<i>Lutra</i> Genus of carnivores

Lutra is a genus of otters, one of seven in the subfamily Lutrinae.

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

The Sardinian dhole 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.

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 m. It has been found mostly in the fine-grained sediments of the western part of the island.

Cyrnaonyx is an extinct genus of Lutrinae, otters from the Pleistocene. It was originally described by Helbing based on materials from France and he also attributed material from Corsica to it. The latter appeared to belong to another species and genus, Algarolutra majori. The only species of Cyrnaonyx is C. antiqua. It is known from the Pleistocene of Europe: France, Germany, Netherlands, Southern England and probably Italy.

<i>Xenocyon</i> Extinct subgenus of carnivores

Xenocyon is an extinct group of canids, either considered a distinct genus or a subgenus of Canis. The group includes Canis (Xenocyon) africanus, Canis (Xenocyon) antonii and Canis (Xenocyon) falconeri that gave rise to Canis (Xenocyon) lycanoides. The hypercarnivorous Xenocyon is thought to be closely related and possibly ancestral to modern dhole and the African wild dog, as well as the insular Sardinian dhole.

<i>Sardolutra</i> Extinct genus of otter

Sardolutra ichnusae is an extinct species of otter from the Late Pleistocene of Sardinia. It was originally described as Nesolutra ichnusae. It was a rather small species of otter, probably living in the sea. Among its characteristics is a relatively very large baculum, larger than in any living otter. The species probably evolved from a species of Lutra, maybe L. castiglionis.

Algarolutra is an extinct endemic genus of otter from the Pleistocene of Corsica and Sardinia. The single species A. majori was originally attributed to the genus Cyrnaonyx and its type species C. antiqua, which was based on fossils from Corsica and also from mainland France. From mainland Europe, only lower dentition was known, whereas from Corsica and Sardinia only upper dentition was known. When a Cyrnaonyx antiqua fossil with both upper and lower dentition was found in England, it became clear that the species majori was too different to keep even in the same genus and the genus Algarolutra was described. appearing to belong to separate genera. A. majori is known only from very sparse evidence.

<i>Alierasaurus</i> Extinct genus of synapsids

Alierasaurus is an extinct genus of caseid synapsid that lived during the early Middle Permian (Roadian) in what is now Sardinia. It is represented by a single species, the type species Alierasaurus ronchii. Known from a very large partial skeleton found within the Cala del Vino Formation, Alierasaurus is one of the largest known caseids. It closely resembles Cotylorhynchus, another giant caseid from the San Angelo Formation in Texas. The dimensions of the preserved foot elements and caudal vertebrae suggest an estimated total length of about 6 or 7 m for Alierasaurus. In fact, the only anatomical features that differ between Alierasaurus and Cotylorhynchus are found in the bones of the feet; Alierasaurus has a longer and thinner fourth metatarsal and it has ungual bones at the tips of the toes that are pointed and claw-like rather than flattened as in other caseids. Alierasaurus and Cotylorhynchus both have very wide, barrel-shaped rib cages indicating that they were herbivores that fed primarily on high-fiber plant material.

<i>Rhagamys</i> Extinct rodent genus

Rhagamys is an extinct genus of rodents in the subfamily Murinae, the Old World mice and rats. The genus was established by the Swiss zoologist Charles Immanuel Forsyth Major to accommodate Rhagamys orthodon, which is the only species in the genus. It was endemic to the Mediterranean islands of Corsica and Sardinia, descending from Rhagapodemus, which had colonised the islands around 3.6 million years ago. Its closest living relatives are of the genus Apodemus, which includes the field and wood mice.

<i>Enhydriodon</i> Extinct genus of carnivores

Enhydriodon is an extinct genus of mustelids known from Africa, Pakistan, and India that lived from the late Miocene to the early Pleistocene. It contains 9 confirmed species, 2 debated species, and at least a few other undescribed species from Africa. The genus belongs to the tribe Enhydriodontini in the otter subfamily Lutrinae. Enhydriodon means “otter tooth” in Ancient Greek and is a reference to its dentition rather than to the Enhydra genus.

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

Talpa tyrrhenica is an extinct species of mole belonging to the genus Talpa. It was endemic to the Mediterranean islands of Corsica and Sardinia during the Pleistocene epoch.

Microtus (Tyrrhenicola) henseli is an extinct species of vole belonging to the genus Microtus that was endemic to Sardinia and Corsica during the Pleistocene and Holocene.

Lontra weiri is a fossil species in the carnivoran family Mustelidae from the Hagerman Fossil Beds of Idaho. It shared its habitat with Satherium piscinarium, a probable ancestor of the giant otter of South America. It is named in honor of musician Bob Weir, and is the oldest known member of its genus. Prior to its discovery, Lontra was thought to have evolved from Lutra licenti, which dates from the Pleistocene of East Asia.

The Cretan otter(Lutrogale cretensis) is an extinct otter that was endemic to Crete during the Pleistocene.

<i>Enhydrictis</i> Extinct genus of mustelid

Enhydrictis is a genus of extinct mustelid, belonging to the subfamily Galictinae. The type species, and best known, is Enhydrictis galictoides from the Pleistocene of Sardinia and Corsica. Some authors attribute species from mainland Eurasia to the genus, but this is disputed, with others considering the genus endemic to Sardinia-Corsica.

Lutra castiglionis, the Castiglione otter or Corsican otter, is an extinct species of otter that was endemic to Corsica during the Pleistocene.

References

  1. G. F. Willemsen & A. Malatesta (1987). "Megalenhydris barbaricina sp. nov., a new otter from Sardinia". Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen, B. 90: 83–92.
  2. Darren Naish. "Islands of otters and strange foxes". Archived from the original on 23 October 2012.
  3. Lyras, George A.; Van Der Geer, Alexandra A. E.; Rook, Lorenzo (2010-02-10). "Body size of insular carnivores: evidence from the fossil record: Body size of fossil insular carnivores". Journal of Biogeography. 37 (6): 1007–1021. doi:10.1111/j.1365-2699.2010.02312.x. S2CID   53700369.
  4. Pereira, E., and M. Salotti. "Cyrnolutra castiglionis, a new otter (Mustelidae, Lutrinae) from the Middle Pleistocene'Castiglione 3CG'deposit (Oletta, Corsica)." Comptes Rendus de l'Académie des Sciences, Séries IIA 331.1 (2000): 45-52.
  5. 1 2 3 Gerard F. Willemsen (2006). "Megalenhydris and its relationship to Lutra reconsidered" (PDF). Hellenic Journal of Geosciences. 41: 83–87.
  6. CHERIN, MARCO (2017-08-23). "NEW MATERIAL OF LUTRA SIMPLICIDENS (CARNIVORA, MUSTELIDAE, LUTRINAE), A KEY TAXON FOR UNDERSTANDING THE EVOLUTION OF EUROPEAN OTTERS". Rivista Italiana di Paleontologia e Stratigrafia (Research in Paleontology and Stratigraphy). 123: N. 3 (2017). doi:10.13130/2039-4942/9024.
  7. Palombo, Maria Rita; Rozzi, Roberto (2014-04-10). "How correct is any chronological ordering of the Quaternary Sardinian mammalian assemblages?". Quaternary International. SEQS 2012 Sardinia: at the Edge of the Sea. 328–329: 136–155. Bibcode:2014QuInt.328..136P. doi:10.1016/j.quaint.2013.09.046. ISSN   1040-6182.