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Title: Estimating the Ontogenetic Status of an Enantiornithine Bird from the Lower Barremian of El Montsec, Central Pyrenees, Spain.
Author: Cambra Moo, Óscar
Chamero Macho, Beatriz
Marugán Lobón, Jesús.
Delclòs Martínez, Xavier
Poyato Ariza, Francisco José
Delgado Buscalioni, Ángela
Keywords: Ocells
Animals extints
Montsec (Catalunya)
Extinct animals
Montsec Mountains (Catalonia)
Issue Date: 2006
Publisher: Consejo Superior de Investigaciones Científicas (CSIC)
Abstract: An Enantiornithes specimen from El Montsec was initially described as an immature individual based upon qualitative traits such as its relatively large orbit and overall proportions of the skull and the postcranium. In this study we re-evaluate the precise determination of the ontogenetic stage of this individual, establishing a cross-talk among taphonomic, anatomic, and morphometric data. The exceptional preservation of the specimen has allowed pondering ontogenetic influence versus preservational bias in features like the external patterns of bone surfaces, instead of being aprioristically considered due to taphonomic alterations only. The rough texture of the periosteal bone associated with pores in the distal, proximal and mid-shaft areas of the humeral shaft, indicates a subadult stage when compared with long bones of modern birds. Forelimb proportions of embryo and juvenile Enanthiornithes are equivalent to those of adult individuals of other taxa within this clade, though this is not a reliable criterion for establishing a precise ontogenetic stage. The El Montsec specimen may be attributed a close adulthood, yet only if growth regimes in Enantiornithes are considered equivalent to those in Neornithes birds.
Note: Reproducció del document publicat a:
It is part of: Estudios Geológicos, 2006, vol. 62, num. 1, p. 241-248
Related resource:
ISSN: 0367-0449
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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