INVESTIGADORES
ELISSAMBURU andrea
artículos
Título:
Diferenciación morfométrica del húmero y fémur de las especies de Paedotherium (Mammalia, Notoungulata) del Plioceno y Pleistoceno temprano
Autor/es:
ELISSAMBURU; VIZCAÍNO, S.F.
Revista:
AMEGHINIANA
Editorial:
Rev. Asoc. Paleontol. Argent.
Referencias:
Lugar: Buenos Aires; Año: 2005 p. 159 - 166
ISSN:
0002-7014
Resumen:
AMEGHINIANA
(Rev. Asoc. Paleontol. Argent.) - 42 (1): 000-000. Buenos Aires, 31-03-2005
ISSN 0000-0000
Diferenciación
morfométrica del húmero y fémur de las
especies
de Paedotherium (Mammalia,
Notoungulata) del
Plioceno
y Pleistoceno temprano
A.
ELISSAMBURU1 y S.F. VIZCAÍNO1
Abstract. Morphometric differentiation of the
humerus and femur of Pliocene and Early Pleistocene
Paedotherium species (Mammalia,
Notoungulata). The genus Paedotherium includes small rodent-like ungulates
that are distinguished by characters of
the skull and teeth. Morphofunctional differences in the appendicular
skeleton of P. bonaerense and P. typicum (Pliocene- early Pleistocene) suggest that
appendicular
characters can be used in specific
identification. In this contribution, morphometric differences between the
humerus and femur are analysed. Five
humeral and six femoral measurements are taken from 29 specimens.
They include functional length (LH),
deltoid length (LDH), transverse and anteroposterior diameter
(DTH, DAPH) and epicondilar diameter (DEH)
for the humerus, and functional length (LF), proximal
length to the third trochanter (LTTF) and
to the lesser tuberosity (LTmF), transverse and anteroposterior
diameter (DTF, DAPF) and epicondilar
diameter (DEF) for the femur. Data are analysed by comparison of
means, principal components analysis
(PCA), discriminant analysis (DA) and correlation with body mass.
Paedotherium bonaerense and P. typicum show differences in DEH, with higher
values for the former, and in
LF and LTTF, with higher values for the
latter. The humerus is more important than the femur in differentiating
between the species. As shown by the
multivariate analysis, the association between DEH and LH
provides the best discriminator between
the species. In the femur, LF and LTTF are associated with the variation
of DTF, DEF and body mass. DA shows the
importance of the humerus for discriminating between
the species, and that the femur is a poor
discriminator, probably due to the influence of body mass on the
linear
data.