Platacanthomys lasiurus
Encyclopedia
The Malabar Spiny Dormouse (Platacanthomys lasiurus) is a species of muroid rodent endemic to the Western Ghats
of India
. It is the only extant species in the genus Platacanthomys and although resembling a dormouse is not closely related. About the size of a Brown Rat
, this arboreal species lives in tree holes in dense forest habitats in a small family group. They are distinguishable from other species in the area by their bushy tuft tip to the tail and the spiny fur on the back.
The position of this species has been puzzled on from very early times. In 1860, Sclater exhibited a specimen noting it as a new dormouse from the Malabar. As early as 1865, this position was disputed on the basis of the dental formula. Peters (1865) suggested that the species was unrelated to the dormice and suggested that they should be placed with the murine genera of India. This position in the family Muridae was used in The Fauna of British India, Including Ceylon and Burma (1891). Palmer (1897) placed the subfamily Platacanthomyinae within the Gliridae. but Ellerman (1940) placed the genus in the subfamily Platacanthomyinae under the family Muscardinidae. Nowak (1999) places the subfamily within the Muridae and includes the genus Typhlomys in this subfamily. The exact phylogenetic relations of Platacanthomys have not been examined using sequence based approaches although Typhlomys has been confirmed to belong within the Muroid clade.
A fossil from the late Miocene (about 9 Mya) of China has been described as Platacanthomys dianensis.
The species was however considered to be common when it was first discovered by Reverend H. Baker (from Mundakyam, Allepey). He obtained the first specimens for Edward Blyth
and noted that they lived in hole nests in large trees and that they were considered a minor pest of fruit trees and in cardamom and pepper plantations.
Four young have been noted in one litter.
Western Ghats
The Western Ghats, Western Ghauts or the Sahyādri is a mountain range along the western side of India. It runs north to south along the western edge of the Deccan Plateau, and separates the plateau from a narrow coastal plain along the Arabian Sea. The Western Ghats block rainfall to the Deccan...
of India
India
India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...
. It is the only extant species in the genus Platacanthomys and although resembling a dormouse is not closely related. About the size of a Brown Rat
Brown Rat
The brown rat, common rat, sewer rat, Hanover rat, Norway rat, Brown Norway rat, Norwegian rat, or wharf rat is one of the best known and most common rats....
, this arboreal species lives in tree holes in dense forest habitats in a small family group. They are distinguishable from other species in the area by their bushy tuft tip to the tail and the spiny fur on the back.
Description
This rodent is about 5 inches long with a 4 inch tail. The ears are large and pointed at the tip. The whiskers are numerous and some are very long. The hairy tail is covered with longer hairs towards the end making the tail wider at the tip. The hairs arise on the sides towards the base of the tail (an arrangement termed as "subdistichous") giving the tail a slightly flattened appearance. The pollux ("thumb") and hallux ("big toe") are without claws. The skull is broad and flat above and the infraorbital foramen is large. They are brownish above and whitish below with a distinct border. The feet are whitish. The tip of the tail is sometimes whitish but is otherwise like the colour of the back. The fur on the back has scattered broad and flat spiny hairs with white tips. Finer spines are also found on the fur of the underside.Taxonomy and systematics
The genus name is derived from the flattened (platy-) spines (Greek acantha) while mus refers to a mouse. The species name lasiurus is based on the Greek lasios for hairy and —oura for tail.The position of this species has been puzzled on from very early times. In 1860, Sclater exhibited a specimen noting it as a new dormouse from the Malabar. As early as 1865, this position was disputed on the basis of the dental formula. Peters (1865) suggested that the species was unrelated to the dormice and suggested that they should be placed with the murine genera of India. This position in the family Muridae was used in The Fauna of British India, Including Ceylon and Burma (1891). Palmer (1897) placed the subfamily Platacanthomyinae within the Gliridae. but Ellerman (1940) placed the genus in the subfamily Platacanthomyinae under the family Muscardinidae. Nowak (1999) places the subfamily within the Muridae and includes the genus Typhlomys in this subfamily. The exact phylogenetic relations of Platacanthomys have not been examined using sequence based approaches although Typhlomys has been confirmed to belong within the Muroid clade.
A fossil from the late Miocene (about 9 Mya) of China has been described as Platacanthomys dianensis.
Distribution
The species is found only in the denser forest regions of the Western Ghats and the Nilgiri hills. They are found in altitudes up to 2000m (such as at Ootacamund and Coonoor) and are found at very low densities. The northernmost record is from Sagar in Shimoga district of Karnataka. Records are few and scattered and published records are from Aralam, Coorg, Peppara and Karianshola.The species was however considered to be common when it was first discovered by Reverend H. Baker (from Mundakyam, Allepey). He obtained the first specimens for Edward Blyth
Edward Blyth
Edward Blyth was an English zoologist and pharmacist. He was one of the founders of zoology in India....
and noted that they lived in hole nests in large trees and that they were considered a minor pest of fruit trees and in cardamom and pepper plantations.
Behaviour and ecology
The species is nocturnal and is largely frugivorous. A specimen in captivity fed voraciously on a diet of fruits. When sleeping it curls its body, hedgehog like, with its tail protruding. The species is believed to feed on pepper in plantations, however trapping surveys suggest that they are mainly restricted to undisturbed forest habitats.Four young have been noted in one litter.
Other sources
- Jayson E.A. 2006. Status, distribution, food and feeding of Malabar Spiny Dormouse (Platacanthomys lasiurus Blyth) in the Western Ghats of Kerala. KFRI Research Report No. 293. Kerala Forest Research Institute, Peechi. 118 p.