Urotrichini

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Urotrichini
Urotrichus talpoides - Berjeau.jpg
Himizu, or Japanese shrew mole (Urotrichus talpoides)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Eulipotyphla
Family: Talpidae
Subfamily: Talpinae
Tribe: Urotrichini
Dobson, 1883
Genera

Urotrichini is a tribe of the mole family, and consists of Japanese and American shrew-moles. They belong to the Old World moles and relatives branch of the mole family (Talpidae). There are only two species, each of which represents its own genus. The name "shrew-moles" refers to their morphological resemblance to shrews, while generally being thought of as "true moles". The species are the Japanese shrew mole, [1] True's shrew mole [2] and American shrew mole. [3] [4] [5] [6] [7] [8]

Contents

In Japan, the word "Himizu" (ヒミズ) may refer to both to the Japanese shrew mole in particular and Urotrichini in general; when True's shrew mole is distinguished from the general Himizu forms, the feminine diminutive word "Hime" is added to refer to the smaller size of that species. Although they are common in Japan, their alpine habitats, small size, and secretive lifestyle makes them generally unknown except among some mountain people and researchers.

Morphology and ecological niche

Urotrichini paws are smaller and more downward- and backward-facing than the out-and-to-the-side orientation of the paws of classic moles, although not so much as in shrews. The limbs protrude slightly down and away from the body, as opposed to being invisibly retracted into the body with paws springing from just behind the head, as with moles. As such, Urotrichini are less well adapted than moles to forward burrowing, but better adapted to digging through the softer surface debris, leaf litter, and topsoils of alpine forest surfaces.

Nocturnality

Unlike true moles, Urotrichini are not equally active day and night. Himizu spend a large part of their days sleeping in specially excavated deep subsoil burrows.

Position within the family Talpidae

The Japanese shrewmole and True's shrewmole are more closely related to the American shrew mole than they are either Taiwanese and mainland Asian "shrew moles" or New World moles. These Urotrichini belong to members of the Old World moles subfamily, which also includes moles and desmans. The chiefly Chinese Uropsilinae shrew-like moles, despite previously having been called "shrew-moles" as well, are morphologically and genetically quite different, and comprise a sub-family of their own.

The taxonomy of this group has changed. Both Asiatic species had been thought of as one genus, Urotrichus. More recently, it was decided that a new genus, Dymecodon, be created within the Urotrichini to reflect significant morphological differences.

Distribution

The fluctuating borders between Urotrichini species in Japan have been the subject of study. Dymecodon pilirostris is found only at higher altitudes, possibly due to soil conditions. The larger Urotrichus talpoides dominates richer lowland areas, displacing D. pilirostris to the poorer soils on the steeper slopes of higher altitudes. Maps of these fluctuating boundaries show a sea of Japanese shrew mole territory dotted with islands of True's Shew mole on the steeper areas. This results in isolation of breeding populations of D. pilirostris and notable sub-speciation among the Himizu Hime which is not found among the standard Japanese shrew moles. [9] [10]

Related Research Articles

<span class="mw-page-title-main">Mole (animal)</span> Small subterranean mammal

Moles are small mammals adapted to a subterranean lifestyle. They have cylindrical bodies, velvety fur, very small, inconspicuous eyes and ears, reduced hindlimbs, and short, powerful forelimbs with large paws adapted for digging.

<span class="mw-page-title-main">Afrosoricida</span> Order of mammals

The clade Afrosoricida contains the golden moles of Southern Africa, the otter shrews of equatorial Africa and the tenrecs of Madagascar. These three groups of small mammals were for most of the 19th and 20th centuries regarded as a part of the Insectivora or Lipotyphla, but both of those groups, as traditionally used, are polyphyletic.

<span class="mw-page-title-main">Talpidae</span> Family of small insectivorous mammals

The family Talpidae includes the true moles who are small insectivorous mammals of the order Eulipotyphla. Talpids are all digging animals to various degrees: moles are completely subterranean animals; shrew moles and shrew-like moles somewhat less so; and desmans, while basically aquatic, excavate dry sleeping chambers; whilst the quite unique star-nosed mole is equally adept in the water and underground. Talpids are found across the Northern Hemisphere of Eurasia and North America, and range as far south as the montane regions of tropical Southeast Asia.

<span class="mw-page-title-main">Talpinae</span> Subfamily of mammals

The subfamily Talpinae, sometimes called "Old World moles" or "Old World moles and relatives", is one of three subfamilies of the mole family Talpidae, the others being the Scalopinae, or New World moles, and the Uropsilinae, or shrew-like moles.

<span class="mw-page-title-main">Desman</span> Subfamily of Eurasian insectivores

Desmans are aquatic insectivores of the tribe Desmanini in the mole family, Talpidae.

<i>Uropsilus</i> Genus of mammals

The shrew moles or shrew-like moles (Uropsilus) are shrew-like members of the mole family of mammals endemic to the forested, high-alpine region bordering China, Myanmar, and Vietnam. They possess a long snout, a long slender tail, external ears, and small forefeet unspecialized for burrowing. Although they are similar to shrews in size, external appearance, and, presumably, ecological habits, they are nevertheless talpids and considered true moles, as they share a full zygomatic arch with all other moles, while this arch is completely absent in shrews.

A shrew mole or shrew-mole is a mole that resembles a shrew. Species with this name include:

<i>Talpa</i> (mammal) Genus of mammals

Talpa is a genus in the mole family Talpidae. Among the first taxa in science, Carolus Linnaeus used the Latin word for "mole", talpa, in his Regnum Animale to refer to the commonly known European form of mole. The group has since been expanded to include 13 extant species, found primarily in Europe and western Asia. The European mole, found throughout most of Europe, is a member of this genus, as are several species restricted to small ranges. One species, Père David's mole, is data deficient. These moles eat earthworms, insects, and other invertebrates found in the soil.

<span class="mw-page-title-main">Afroinsectiphilia</span> Clade of mammals

The Afroinsectiphilia is a clade that has been proposed based on the results of recent molecular phylogenetic studies. Many of the taxa within it were once regarded as part of the order Insectivora, but Insectivora is now considered to be polyphyletic and obsolete. This proposed classification is based on molecular studies only, and there is no morphological evidence for it.

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

The Japanese mole, also known as Temminck's mole, is a species of mole endemic to Japan. A solitary and diurnal species, it can live for up to 3.5 years in the wild. Their sizes vary depending on the temperature and the hardness of the soil they reside in.

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

The Ryukyu shrew , also known as Orii's shrew, is a species of mammal in the family Soricidae. It is endemic to the Amami Islands of Japan. It is threatened by habitat loss.

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

The insular mole is a species of mammal in the family Talpidae. It is restricted to Hainan Island and Taiwan, where it is also known as the Formosan blind mole. The species was first described by Robert Swinhoe in 1863.

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

The Senkaku mole, also known as the Ryukyu mole, is a species of mammal in the family Talpidae. It was formerly classified as being the only species in the genus Nesoscaptor. It is endemic to the Uotsuri-jima of the disputed territory of Senkaku Islands, also known as the Diaoyutai Islands. It is most similar to the Insular mole of Taiwan and mainland China.

<span class="mw-page-title-main">True's shrew mole</span> Species of mammal

True's shrew mole is a species of mammal in the family Talpidae. It is endemic to Japan and is a common species above 1000 meters in grassland, shrubland and forest. Sometimes this species is called the lesser Japanese shrew mole and another species, Urotrichus talpoides, is called the "greater Japanese shrew mole".

<i>Urotrichus</i> Genus of mammals

Urotrichus is a genus of talpid that contains a single living species, the Japanese shrew mole (Urotrichus talpoides). Two fossil species are also known.

<span class="mw-page-title-main">Japanese shrew mole</span> Species of mammal

The Japanese shrew mole or himizu (ヒミズ) is a species of mammal in the family Talpidae. It is endemic to Japan and is found on Honshu, Shikoku, Kyushu, Awaji Island, Shodo Island, Oki Islands, Tsushima Island, Goto Islands, Mishima Island, and Awashima Island, but is absent from Hokkaido, which is north of Blakiston's Line. It is one of three Urotrichini and it is the only extant species in the genus Urotrichus. It is common between sea level and approximately 2,000 m. Sometimes this species is called the greater Japanese shrew mole and another species, True's shrew mole, is called the "lesser Japanese shrew mole".

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

Talpini is a tribe of mammals known as Old World moles. It is a division of the subfamily Talpinae.

<span class="mw-page-title-main">Ognev's mole</span> Species of mammal

Ognev's mole is a species of mammal in the family Talpidae. It occurs in the southeastern coastal area of the Black Sea from northeastern Turkey to Georgia. It inhabits different habitats associated with moist soils in lowland areas. Little information is available about its life history.

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

The Talysch mole is a species of mammal in the family Talpidae. It is a small member of the family, which outwardly resembles the Levant mole, but is genetically closer to Père David's mole. It is common on the southwest coast of the Caspian Sea, from southern of Azerbaijan through most of the north of Iran. The habitat includes temperate rainforests and scrub areas. There is little information about the life history of the Talysch mole. It was described in 1945, but had long been considered a subspecies of various other Eurasian moles, and was only recognized as a distinct species in the mid-2010s. No surveys have been carried out to quantify the status of the species.

References

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  2. "Adw: Talpidae: Classification". Animaldiversity.ummz.umich.edu. Retrieved 2013-09-01.
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  7. Shinohara, Akio; Suzuki, Hitoshi; Tsuchiya, Kimiyuki; Zhang, Ya-Ping; Luo, Jing; Jiang, Xue-Long; Wang, Ying-Xiang; Campbell, Kevin L. (December 2004). "Evolution and Biogeography of Talpid Moles from Continental East Asia and the Japanese Islands Inferred from Mitochondrial and Nuclear Gene Sequences". Zoological Science. 21 (12): 1177–1185. doi:10.2108/zsj.21.1177. hdl: 2115/14745 . ISSN   0289-0003. PMID   15613798. S2CID   6905702.
  8. Carmona, F. David; Motokawa, Masaharu; Tokita, Masayoshi; Tsuchiya, Kimiyuki; Jiménez, Rafael; Sánchez-Villagra, Marcelo R (2007-12-17). "The evolution of female mole ovotestes evidences high plasticity of mammalian gonad development". Journal of Experimental Zoology Part B: Molecular and Developmental Evolution. 310B (3): 259–266. doi:10.1002/jez.b.21209. PMID   18085526.
  9. Yoshiyuki, Imura; Yukibumi, Kaneko; Miho, Konno (2009-03-18). "The Shift in the Altitudinal Distributions of Dymecodon pilirostris and Urotrichus talpoides in the Mt. Bandai Area, Fukushima Prefecture, Japan". Mammalian Science (in Japanese) (82): 71–82. ISSN   0385-437X. Archived from the original on February 29, 2012. Retrieved 2013-09-01.
  10. Dobson, Mike (September 1994). "Patterns of distribution in Japanese land mammals". Mammal Review. 24 (3): 91–111. doi:10.1111/j.1365-2907.1994.tb00137.x. ISSN   0305-1838.