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The humerus of Eusthenopteron: a puzzling organization presaging the establishment of tetrapod limb bone marrow - Essay Example

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This study presents a three-dimentional approach for analyzing the tetrapod stems within an ontogenetic framework, using new micro-anatomical and palaeohistological…
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The humerus of Eusthenopteron: a puzzling organization presaging the establishment of tetrapod limb bone marrow
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"The humerus of Eusthenopteron: a puzzling organization presaging the establishment of tetrapod limb bone marrow"

Download file to see previous pages Therefore, the study involves imaging of numerous specimens obtained from primitive aquatic sarcopterygian Eusthenopteron in order to produce a broad palaeobiological dataset and make comprehensive conclusion.
The dominant Eusthenopteron species in the Canadian, Miguasha, and Quebec regions were used in the study, and the abundant fossil material available made the investigation of ontogeny using size series possible.
The study focused on the humeri obtained from two large and one small Eusthenopteron, all with a three-dimensional preservation. The small humeri used was ossified completely, thus interpreted as juvenile, whereas one of the large humeri was preserved in articulation together with the ulna’s proximal end, as well as being in association with more fin endoskeleton distal elements and lepidotrichial proximal ends. The comparative aspects of these elements was done through scanning. These specimens were imaged by beamline ID19 of propagation phase-contrast X-ray synchrotron radiation microtomography (PPC-SRμCT) and European Synchrotron Radiation Facility (ESRF). There was the use of homogeneity assumption-based phase retrieval approach for the purpose of data reconstruction.
According the study observations, Eusthenopteron posses a more unique combination of life history and biological traits compared to what had been thought before. In terms of its morphology, Eusthenopteron appears like a conventional predator fish that lacks definite terrestrial adaptations. It has humerous that resembles, both in proportion and size, the other sarcopterygians with lobed fins. The humerous ossification started at at least a half adult-size of the element and animal. On the other hand, the bones of the extant tetrapod limbs ossify earlier. The study reveals an organized spongiosa in the Eusthenopteron humerus, which appears to host functional bone marrow, and appears to have undergone extension growth just ...Download file to see next pagesRead More
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