Nesiotites

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Nesiotites
Temporal range: Early Pliocene–Holocene
Asoriculus hidalgo (cropped).jpg
Size comparison of the Balearic shrew Nesiotites hidalgo (top) with a water shrew ( Neomys , below)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Eulipotyphla
Family: Soricidae
Tribe: Nectogalini
Genus: Nesiotites
Bate, 1945
Species
  • N. hidalgoBate, 1945 (type)
  • N. meloussaePons and Moyà, 1980
  • N. ponsiReumer, 1979
  • N. rafelinensis? Rofes et al, 2012

Nesiotites is an extinct genus of large red-toothed shrews belonging to the tribe Nectogalini known from the latest Miocene/Early Pliocene to Holocene of the Balearic Islands of Mallorca and Menorca.

Contents

Taxonomy

Nesiotites was originally described by Dorothea Bate in 1945, with the type species being Nesiotites hidalgo. [1] Originally, two species from the islands of Corsica and Sardinia (N. corsicanus and N. similis) were included in the genus, but these are now rejected from the genus, and Nesiotites is now generally used exclusively for the Balearic species, as otherwise the genus would likely be polyphyletic. [2]

The genus includes the chronospecies N. rafelinensis (earliest Pliocene) [3] (the validity of this species disputed, as some authors contend that it is not morphologically distinct from N. ponsi [4] [5] ) N. ponsi (Late Pliocene), N. meloussae/N. aff. ponsi (Early Pleistocene) and N. hidalgo (Middle Pleistocene-Holocene). These are largely distinguished by differences in body size and characters of the teeth. [3] [6]

Based on a mitochondrial genome from Nesiotites hidalgo, their closest living relative is the terrestrial Himalayan shrew ( Soriculus ), and related to other terrestrial nectogaline shrews known from Asia ( Episoriculus and Chodsigoa ), rather than to the nectogaline water shrews ( Chimarrogale , Nectogale and Neomys ). A molecular clock analysis suggests that Himalayan shrews and Balearic shrews genetically diverged approximately 6.44 million years ago. Based on morphological data, it is thought that Nesiotites is closely related and likely descended from the extinct genus Asoriculus , known from the Late Miocene-Holocene of Europe and North Africa, which now includes the Corsican and Sardinian species formerly included in Nesiotites. [2]

Position of Nesiotites within Nectogalini based on DNA and morphological characters after Bover et al (2018): [2]

Nectogalini

Episoriculus fumidus

Chimarrogale himalayica (Himalayan water shrew)

Nectogale elegans (elegant water shrew)

Neomys

Neomys fodiens (water shrew)

Neomys newtoni

Soriculus nigrescens (Himalayan shrew)

Nesiotites hidalgo

Asoriculus gibberodon

Episoriculus

Episoriculus leucops

Episoriculus caudatus

Episoriculus macrurus

Chodsigoa

Chodsigoa parca

Chodsigoa sodalis

Chodsigoa hypsibia

Description

Members of Nesiotites exhibited a large body size compared to their likely mainland ancestor, Asoriculus gibberodon (esimated to weigh 8.85 grams (0.312 oz)), as well to most other members of Nectogalini, an example of island gigantism. The species of the genus showed an increase in body size over time, with the estimated weight of N. ponsi being 14.58 grams (0.514 oz) while the last species, N. hildalgo being estimated at 26.63–29.31 grams (0.939–1.034 oz), being exceeded in size amongst Nectogalini only by Asiatic water shrews (Chimarrogale). [7]

Evolutionary history

Nesiotites originally colonised Mallorca during the Messinian stage of the Late Miocene, when during the Messinian salinity crisis (5.96–5.33 million years ago) the Mediterranean sea evaporated allowing animals from the Iberian Peninsula to disperse to the Balearics. Later becoming isolated on the island when the Mediterranean refilled as result of the Zanclean Flood around 5.3 million years ago, at the beginning of the Pliocene. Nesiotites later spread to Menorca during the Pliocene-Pleistocene transition, when episodes of low sea level connected the two islands. [8] [6] During most of its existence, it represented only one of three terrestrial mammal lineages native to the Balearic islands, alongside the giant dormouse Hypnomys and the dwarf goat-antelope Myotragus . The last Nesiotites chronospecies, N. hidalgo, became extinct shortly after human settlement of the Balearics, which occurred sometime prior to 2282 BC, with the youngest radiocarbon date for the species dating to approximately 3027 BC. [9]

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<span class="mw-page-title-main">Red-toothed shrew</span> Subfamily of mammals

The red-toothed shrews of the subfamily Soricinae are one of three living subfamilies of shrews, along with Crocidurinae and Myosoricinae. In addition, the family contains the extinct subfamilies Limnoecinae, Crocidosoricinae, Allosoricinae and Heterosoricinae. These species are typically found in North America, northern South America, Europe and northern Asia. The enamel of the tips of their teeth is reddish due to iron pigment. The iron deposits serve to harden the enamel and are concentrated in those parts of the teeth most subject to wear. Members of the genera Chimarrogale, Nectogale, Neomys (Nectogalini) and some members of Sorex (Soricini) are known as water shrews, due to having a semi-aquatic lifestyle.

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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.

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The genus Crocidura is one of nine genera of the shrew subfamily Crocidurinae. Members of the genus are commonly called white-toothed shrews or musk shrews, although both also apply to all of the species in the subfamily. With over 180 species, Crocidura contains the most species of any mammal genus. The name Crocidura means "woolly tail", because the tail of Crocidura species are covered in short hairs interspersed with longer ones.

<i>Nuralagus</i> Extinct genus of leporid

Nuralagus is an extinct genus of leporid, with a single species, Nuralagus rex, described in 2011. It lived on Menorca, one of the Balearic Islands in the western Mediterranean during the Pliocene epoch. It is the largest known lagomorph to have ever existed, with an estimated weight of 8–12 kilograms (18–26 lb), nearly double the weight of the average Flemish Giant rabbit. It likely went extinct at the Pliocene-Pleistocene transition when Mallorca and Menorca were united as one island, letting the mammalian fauna of Mallorca, including the goat-like ungulate Myotragus, colonize Nuralagus's habitat.

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<span class="mw-page-title-main">Nectogalini</span> Tribe of mammals

Nectogalini is a tribe of Old World water shrews within the family Soricidae. As of late 2007, it consisted of six extant genera and 25 species, with some of the latter being further divided into subspecies. Some, but not all members of the tribe are semiaquatic.

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<i>Hypnomys</i> Extinct genus of giant dormice

Hypnomys, otherwise known as Balearic giant dormice, is an extinct genus of dormouse (Gliridae) in the subfamily Leithiinae. Its species are considered examples of insular gigantism. They were endemic to the Balearic Islands in the western Mediterranean from the Early Pliocene until their extinction around 4,000 years ago. They first appeared in the fossil record on Mallorca during the Early Pliocene, presumably due to the Messinian salinity crisis causing a connection with mainland Europe. They later spread to Menorca, and a possible molar is also known from Ibiza. Hypnomys became extinct during the Holocene after human arrival on the Balearics. They were one of only three native land mammals to the islands at the time of human arrival, alongside the shrew Nesiotites and goat-antelope Myotragus.

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<i>Soriculus</i> Genus of mammal

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References

  1. Bate, Dorothea M.A. (November 1944). "LXIII.— Pleistocene shrews from the larger Western Mediterranean Islands". Annals and Magazine of Natural History. 11 (83): 738–769. doi:10.1080/00222934408527471. ISSN   0374-5481.
  2. 1 2 3 Bover, Pere; Mitchell, Kieren J.; Llamas, Bastien; Rofes, Juan; Thomson, Vicki A.; Cuenca-Bescós, Gloria; Alcover, Josep A.; Cooper, Alan; Pons, Joan (August 2018). "Molecular phylogenetics supports the origin of an endemic Balearic shrew lineage (Nesiotites) coincident with the Messinian Salinity Crisis". Molecular Phylogenetics and Evolution. 125: 188–195. doi:10.1016/j.ympev.2018.03.028. PMID   29608962. S2CID   5010906.
  3. 1 2 Rofes, J.; Bover, P.; Cuenca-Bescós, G.; Alcover, J.A. (2012). "Nesiotites rafelinensis sp. nov., the earliest shrew (Mammalia, Soricidae) from the Balearic Islands, Spain". Palaeontologia Electronica. 15 (1): 8A. doi: 10.26879/282 .
  4. Rofes, J; Bover, P; Cuenca-Bescós, G; Alcover, Ja (2013). "Proportions, characters and chronologies: their contribution to systematic paleontology. A rebuttal to Furió and Pons-Monjo". Palaeontologia Electronica. doi: 10.26879/412 . ISSN   1094-8074.
  5. Furió, M; Pons-Monjo, G (2013). "The use of the species concept in paleontology. Comment on "Nesiotites rafelinensis sp. nov., the earliest shrew (Mammalia, Soricidae) from the Balearic Islands, Spain" by Rofes et al., 2012". Palaeontologia Electronica. doi: 10.26879/336 . ISSN   1094-8074.
  6. 1 2 Cardona, Josep Quintana; Agusti, Jordi (May 2019). "First evidence of faunal succession in terrestrial vertebrates of the Plio-Pleistocene of the Balearic Islands, western Mediterranean". Comptes Rendus Palevol. 18 (3): 317–324. doi:10.1016/j.crpv.2019.02.001. S2CID   150158569.
  7. Moncunill-Sole, B.; Jordana, X.; Köhler, M. (2016). "How common is gigantism in insular fossil shrews? Examining the 'Island Rule' in soricids (Mammalia: Soricomorpha) from Mediterranean Islands using new body mass estimation models". Zoological Journal of the Linnean Society. 178 (1): 163–182. doi: 10.1111/zoj.12399 .
  8. Pons-Monjo, Guillem; Moyà-Solà, Salvador; Furió, Marc (July 2012). "New data on the origin of Nesiotites (Soricidae, Mammalia) in Menorca (Balearic Islands, Spain)". Comptes Rendus Palevol. 11 (5): 393–401. doi:10.1016/j.crpv.2012.03.001.
  9. Valenzuela, Alejandro; Torres-Roig, Enric; Zoboli, Daniel; Pillola, Gian Luigi; Alcover, Josep Antoni (2021-11-29). "Asynchronous ecological upheavals on the Western Mediterranean islands: New insights on the extinction of their autochthonous small mammals". The Holocene. 32 (3): 137–146. doi:10.1177/09596836211060491. ISSN   0959-6836. S2CID   244763779.