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New birkeniid anaspid from the Lower Devonian of Scotland and its phylogenetic implications
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi.
2012 (Engelska)Ingår i: Palaeontology, ISSN 0031-0239, E-ISSN 1475-4983, Vol. 55, nr 3, s. 641-652Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Abstract:  A new possible stem gnathostome, Kerreralepis carinata gen. et sp. nov., is described on the basis of a single specimen from the Lower Devonian of the island of Kerrera in the Inner Hebrides, Scotland. It is recognized as an anaspid by the chevron-like arranged rod-shaped scales on the trunk, gill openings extending behind the orbits in a slanting row and a series of median dorsal ridge scales. This specimen also has a series of median ventral plates, indicating the presence of a preanal fin-fold, which in turn has consequences for interpretations of other problematic stem gnathostomes and their phylogenetic context. A cladistic analysis supports a monophyletic Anaspida including the scale-covered birkeniids but excluding Lasanius as well as anaspid-like forms such as Euphanerops and Jamoytius. The establishment of a new genus and species increases the diversity of anaspids and allows for a more detailed study of anaspid interrelationships. An ingroup analysis using Lasanius as an outgroup resolves Birkenia as a rather basal anaspid, sister to all other anaspids, alternatively sister to a clade represented by the taxa from Ringerike, Norway, and the closely associated taxon from Saaremaa Island, Estonia. These topologies agree rather well with the present fossil record of anaspids.

Ort, förlag, år, upplaga, sidor
2012. Vol. 55, nr 3, s. 641-652
Nyckelord [en]
Devonian, anaspid, Scotland, phylogeny, stem gnathostome
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:uu:diva-191398DOI: 10.1111/j.1475-4983.2012.01142.xOAI: oai:DiVA.org:uu-191398DiVA, id: diva2:585601
Tillgänglig från: 2013-01-10 Skapad: 2013-01-10 Senast uppdaterad: 2017-12-06Bibliografiskt granskad

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