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Abstract: The aardvark is the last living Tubulidentata, an order of afrotherian mammals.
Afrotheria is supported strongly by molecular analyses, yet sparingly by morphological
characters. Moreover, the biology of the aardvark remains incompletely known. The
inner ear, and its ontogeny in particular, has not been studied in details yet, though
it bears key ecomorphological characters and phylogenetical signal. The aim of this
study is to decipher and discuss the ontogenetic development of the different areas
of the inner ear of Orycteropus afer. We focused in particular on their relative size and
morphological rates of development. Specimens were scanned with 3D imaging techniques.
3D and 2D geometric morphometrics coupled with qualitative descriptions of
the petrosal ossification allowed us to evidence several stages through development.
Based on our sample, the cochlea is the first structure of the inner ear to reach adult
size, but it is the last one to acquire its adult morphology close to parturition. In contrast,
after a delayed growth spurt, the semicircular canals reach their mature morphology
before the cochlea, concomitantly with the increase of petrosal ossification.
The ontogeny of the aardvark inner ear shows similarities with that of other species,
but the apex of the cochlea presents some autapomorphies.
This work constitutes a first step in the study of the ontogeny of this sensorial
organ in Afrotheria.
Fuente: Journal of Anatomy, May 238(5), 1128 - 1142
Editorial: John Wiley & Sons
Fecha de publicación: 01/05/2021
Nº de páginas: 15
Tipo de publicación: Artículo de Revista
SANTIN, MATHIEU D.