Philip Myers' Akodont is a recently described species of grass mouse

Akodon

Akodon is a genus consisting of South American grass mice. They mostly occur south of the Amazon Basin and along the Andes north to Venezuela, but are absent from much of the basin itself, the far south of the continent, and the lowlands west of the Andes. Akodon is one of the most species-rich...

 from Misiones Province

Misiones Province

Misiones is one of the 23 provinces of Argentina, located in the northeastern corner of the country in the Mesopotamiсa region. It is surrounded by Paraguay to the northwest, Brazil to the north, east and south, and Corrientes Province of Argentina to the southwest.- History :The province was...

, Argentina

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

. Like other grass mice, A. philipmyersi is a small, non-descript, greyish-brown mouse with prominent ears. The species was recognized as distinct from other grass mice on the basis of unique features of karyology, gene

Gene

A gene is a molecular unit of heredity of a living organism. It is a name given to some stretches of DNA and RNA that code for a type of protein or for an RNA chain that has a function in the organism. Living beings depend on genes, as they specify all proteins and functional RNA chains...

tic sequence, cranial

Skull

The skull is a bony structure in the head of many animals that supports the structures of the face and forms a cavity for the brain.The skull is composed of two parts: the cranium and the mandible. A skull without a mandible is only a cranium. Animals that have skulls are called craniates...

 measurements, and general morphology

Morphology (biology)

In biology, morphology is a branch of bioscience dealing with the study of the form and structure of organisms and their specific structural features....

.

Etymology

The specific epithet for this animal, philipmyersi, is named after renowned mammalogist Philip Myers

Philip Myers

Philip Myers is a noted American horn player. Myers plays a F/B-flat/f alto Engelbert Schmid Triple Horn. He currently owns five horns, down from a high at one time of 17...

 of the University of Michigan Museum of Zoology and major contributor to the Animal Diversity Web. Philip Myers has made major contributions in determining the relationships among members of the genus Akodon.

Description

A. philipmyersi is described as having a small body size, tail, and limbs relative to other members of the genus. The animals have a karyotype

Karyotype

A karyotype is the number and appearance of chromosomes in the nucleus of an eukaryotic cell. The term is also used for the complete set of chromosomes in a species, or an individual organism.p28...

 of (2n=36, FN=42). The species differs from its only sympatric relative, A. montensis, by 11.3-11.4% sequence divergence at the cytochrome b

Cytochrome b

Cytochrome b/b6 is the main subunit of transmembrane cytochrome bc1 and b6f complexes. In addition, it commonly refers to a region of mtDNA used for population genetics and phylogenetics.- Function :...

 gene. A. montensis can also be distinguished by its 2n=24 chromosome number and by its preference for forest instead of grassland habitat.

Natural history

A. philipmyersi seems to prefer grassland areas with tall vegetation. Remains of the animals have also been found in owl pellets.

Relation to other species

Pardiñas et al. (2005) suggest that the closest relative to A. philipmyersi is A. lindberghi, but this is only weakly supported statistically. Morphometric analyses and a shared number of chromosomes (n=36), also point to a similarity between these two species. The two are distinct both morphometrically and genetically (cytochrome b divergence = 10.1%).