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What is a pore-canal system?
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
2011 (English)In: Abstracts: The 2nd Wiman meeting : Carl Wiman's Legacy : 100 years of Swedish Palaeontology : Uppsala 17–18 November 2011 / [ed] Benjamin P. Kear and Michael Streng, 2011, 20-21 p.Conference paper, Published paper (Other academic)
Abstract [en]

The pore-canal system is part of the defining ‘comsine’ structure of early sarcopterygians. It lies in the upper dentinous region of the dermal skeleton and has abundant external openings connected by horizontal ‘Maschenkanäle' to a deeper canal system in the thickened spongia layer – the ‘Unter-Maschenkanäle'. A similar horizontal canal system is also present in early actinopterygians but is not generally considered homologous. We generated 3D reconstructions of scale canals in three early osteichthyans: Lophosteus, Andreolepis, and Psarolepis, the latter being a basal sarcopterygian. Well-developed horizontal canal-systems were found in all of the sampled taxa, although their morphology was more regular in Psarolepis. In addition, Psarolepis possesses a less regular canal system at slightly deeper levels within the bony tissues, which might correspond to the ‘Unter-Maschenkanäle' of crown sarcopterygians (e.g. Porolepis). Conversely, the dentinal canals in Psarolepis appear to arise from both the lower canal system and horizontal ‘Maschenkanäle'. This feature represents a potential link between actinopterygians and sarcopterygians, thus rendering the horizontal canal system (probably part of the vascularization of the scale) potentially homologous across early osteichthyans.

Place, publisher, year, edition, pages
2011. 20-21 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-166348OAI: oai:DiVA.org:uu-166348DiVA: diva2:476095
Conference
The 2nd Wiman Meeting on Scandinavian-Baltic Palaeontology. Carl Wiman's Legacy: 100 years of Swedish Palaeontology, Uppsala, Sweden, November 17-18 2011
Available from: 2012-01-11 Created: 2012-01-11 Last updated: 2015-08-07Bibliographically approved

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Qu, QingmingAhlberg, PerBlom, Henning

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