Asoriculus
Asoriculus
Extinct genus of red-toothed shrew
Asoriculus is an extinct genus of terrestrial shrews in the subfamily Soricinae (red-toothed shrews) and tribe Nectogalini, native to Europe (including the islands of Corsica, Sardinia and Sicily) and North Africa.
The best known species of Asoriculus, Asoriculus gibberodon, was widespread in Europe from the Late Miocene (Messinian, MN13, from around 7.2-5.3 million years ago[1]) to the Early Pleistocene,[2] and was also present in Anatolia during the Pliocene.[3] The youngest records of the species date to the end of the Early Pleistocene approximately 846,000 ± 57,000 years ago in the Iberian Peninsula.[4] Another larger species, A. thenii, is sometimes also recognised in the Early Pleistocene of Europe.[4] The species Asoriculus maghrebiensis is known from the Pliocene-Pleistocene boundary (c. 2.5 million years ago) of Morocco in North Africa, making it the only known member of Soricinae to have been native to the African continent.[5]
Insular species are known from the Mediterranean islands of Sicily (A. burgioi Late Pliocene-Early Pleistocene), and Corsica-Sardinia including A. corsicanus (Late Pliocene-Early Pleistocene) and A. similis (Early Pleistocene-Late Pleistocene/Holocene).[6][7] A. similis likely survived into the Holocene, when it became extinct sometime after human settlement of the islands, with remains apparently being found in Mesolithic and Neolithic aged archaeological sites.[8] Asoriculus is closely related and likely ancestral to the genus Nesiotites, known from the Balearic Islands from the Early Pliocene to the Holocene,[2] whos species have sometimes been included in Asoriculus.[9] The Asoriculus species A. corsicanus and A. similis were formerly included in Nesiotites in its original circumscription, though they are usually no longer treated as part of the genus.[2]
A. gibberodon has been estimated to weigh approximately 8.85 grams (0.312 oz). The insular species of Asoriculus are substantially larger than A. gibberodon and most other species of Nectogalini, with A. burgioi estimated to weigh 27.54 grams (0.971 oz) and A. similis 23.68 grams (0.835 oz), which has been cited as an example of island gigantism.[6]
Based on DNA from Nesiotites, the closest living relative of Asoriculus is considered to be the terrestrial Himalayan shrew (Soriculus), belonging to a clade of terrestrial nectogaline shrews primarily known from Asia, also including the genera Episoriculus and Chodsigoa, rather than related 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.[2]
Phylogeny of Nectogalini based on DNA and morphological characters after Bover et al. (2018).[2]
| Nectogalini |
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