SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Reconstructing the body mass of a fossil animal is an essential step toward understanding its palaeoecological role. Length × width (L×W) of the first lower molar (m1) is frequently used as a proxy for body mass in fossil mammals. However, among rodents, Muroidea have no premolar and an elongated m1, whereas other groups have a premolar and a m1 that is not elongated. This leads to an overestimation of body mass in muroids and/or an underestimation in other rodents. To solve this problem we assembled data of upper and lower tooth row length and body mass in extant rodents, and calculated regression equations for all rodents, rodents with premolars, rodents without premolars and for taxonomic groups at superfamily or family level. Data for complete tooth...

Cricetidae and Gliridae (Rodentia, Mammalia) from the Miocene and Pliocene of southern Spain

Palavras-chave: Rodentia; Body mass; 42.84; 38.22.

Ano: 2013

URL: http://www.repository.naturalis.nl/record/469427

García-Alix, A.; Minwer-Barakat, R.; Martín-Suárez, E.; Freudenthal, M..

Several Miocene and Pliocene continental fossiliferous localities in the Granada and Guadix basins have yielded fossil micromammals. Cricetids and glirids are known from most of these localities. This paper deals with the genera Apocricetus, Ruscinomys, Blancomys and Eliomys. The Cricetidae are important biostratigraphical markers, especially Apocricetus. The presence of A. barrierei in the locality PUR-4 indicates the beginning of the Early Ruscinian. The continuous record of Ruscinomys during the Late Turolian and the Early Ruscinian corroborates the lineage between R. schaubi and R. lasallei. The occurrence of a large specimen of Blancomys in the Granada Basin seems to indicate two phylogenetic lineages during the Late Turolian. The studied specimens of...

Revision of the subfamily Bransatoglirinae (Gliridae, Rodentia, Mammalia)

Palavras-chave: Gliridae; Cricetidae; Granada basin; Guadix basin; Mio-Pliocene boundary; 42.48; 38.22.

Ano: 2008

URL: http://www.repository.naturalis.nl/record/314204

Daams & de Bruijn created the subfamily Bransatoglirinae for the genus Bransatoglis Hugueney, and considered Paraglis Baudelot and Oligodyromys Bahlo to be synonyms of Bransatoglis. Twenty two valid species have been classified as Bransatoglis or one of its supposed synonyms, ranging in age from Late Eocene (MP17) to Middle Miocene (MN6) and varying in size from very small to very large. Apparently, Bransatoglis has become a ‘wastebasket’ and it is impossible to formulate a diagnosis that covers all these species. In this paper the genera Paraglis and Oligodyromys are restored, new diagnoses are given and the genus Microdyromys is transferred from the Dryomyinae to the Bransatoglirinae. A new species of Oligodyromys, O. libanicus, is described from the...

Estimating head and body length in fossil rodents

Palavras-chave: Gliridae; Bransatoglirinae; Classification; New species; 42.84; 38.22.

Ano: 2007

URL: http://www.repository.naturalis.nl/record/314199

We present estimates for head and body length (HBL) of fossil rodents. We assembled HBL data and tooth row length data (LTR, UTR) for a large number of extant rodents, and calculated regression lines of HBL on LTR and UTR for all rodents together (all-rodents equation), and for separate taxonomic groups (family equations). In fossil rodents, data for complete tooth rows are scarce, therefore we use the sum of the lengths of the teeth (LRsum, URsum) as a surrogate for tooth row length. The relation between this parameter and real tooth row length (LTR, UTR) is calculated on the basis of a number of populations for which both parameters are available. We estimate HBL of fossil rodents, using LRsum and URsum and the regression lines of extant rodents, and we...

Microdyromys (Gliridae, Rodentia, Mammalia) from the Early Oligocene of Montalbán (Prov. Teruel, Spain)

Palavras-chave: Rodentia; Body mass; Teeth; Tooth row length.

Ano: 2015

URL: http://www.repository.naturalis.nl/record/607530

A new species of Microdyromys, M. puntarronensis, is described from the Early Oligocene locality Montalbán 8 (Teruel, Spain). It is compared with the other Early Oligocene species of the genus, M. misonnei. The latter is known from Hoogbutsel (Belgium) and Montalbán 1D. Montalbán 8 is intermediate in age between Hoogbutsel and Montalbán 1D, and the dental pattern of its Microdyromys is more advanced than it is in Montalbán 1D. This leads to the conclusion that two lineages of Microdyromys existed in the Early Oligocene. An attempt is made to follow these lineages throughout the Late Oligocene and the Miocene.