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New observations on the squamation patterns of articulated specimens of Loganellia scotica (Traquair, 1898) (Vertebrata: Thelodonti) from the Lower Silurian of Scotland

Živile Žigaitė and Daniel Goujet

Geodiversitas Jun 2012 : Vol. 34, Issue 2, pg(s) 253- 270https://doi.org/10.5252/g2012n2a1

Abstract & References

New observations on the squamation patterns of articulated specimens of Loganellia scotica (Traquair, 1898) (Vertebrata: Thelodonti) from the Lower Silurian of Scotland

Živile Žigaitė

and

Daniel Goujet

Received: February 8, 2010; Accepted: February 22, 2011

[+] Author & Article Info

Author Affiliations

Živile Žigaitė

Université Lille 1, UFR Sciences de la Terre, FRE 3298 du CNRS Géosystèmes, F-59655 Villeneuve d'Ascq cedex (France) and Uppsala University, Department of Organism Biology, Subdepartment of Evolution and Development, Norbyvägen 18A, 75236 Uppsala (Sweden) zivile.zigaite@gmail.com

Daniel Goujet

Muséum national d'Histoire naturelle, Département Histoire de la Terre, Laboratoire de Paléontologie, UMR CNRS 7207, case postale 39, 57 rue Cuvier, F-75231 Paris cedex 05 (France) goujet@mnhn.fr

Žigaitė Ž. & Goujet D. 2012. — New observations on the squamation patterns of articulated specimens of Loganellia scotica (Traquair, 1898) (Vertebrata: Thelodonti) from the Lower Silurian of Scotland. Geodiversitas 34 (2): 253–270.

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ABSTRACT

Articulated squamations of Loganellia scotica (Traquair, 1898) from the Lower Silurian Lesmahagow inliers of southern Scotland have been studied. They include seven articulated specimens, three of them representing complete thelodont fossils, and four partially preserved postpectoral, precaudal and caudal parts of the exoskeleton. All the five main types of thelodont scales that is rostral, cephalo-pectoral, postpectoral, precaudal and pinnal sacles, as well as respective squamation patterns have been observed on articulated specimens. The specific orbital, branchial, and bucco-pharyngeal scales, characteristic of L. scotica, have not been found due to the poor or non-preservation of these particular areas within the specimens studied. Tail morphology and squamation pattern of the caudal fin have been studied with particular attention, and the constitution of the caudal fin rays has been analyzed. The rostral squamation pattern is argued to be characteristic to L. scotica.

RÉSUMÉ

Observations nouvelles sur la structure de la squamation sur des individus articulés de Loganellia scotica (Traquair, 1898) (Vertebrata, Thelodonti) du Silurien inférieur d'Écosse. L'écaillure complète de plusieurs spécimens de Loganellia scotica (Traquair, 1898) du Silurien inférieur du gisement de Lesmahagow (sud de l'Écosse) est ici étudiée. Cette investigation porte sur sept individus articulés, trois d'entre eux représentant des spécimens de thélodontes fossiles complets et quatre, l'exosquelette correspondant à des régions partiellement conservées: postpectorale, précaudale et caudale. Les cinq types d'écailles présents chez les thélodontes, c'est-à-dire les types rostral, cephalopectoral, précaudal et pinnal ont été reconnus sur les spécimens complets. La squamation particulière des régions orbitaire, branchiale et bucco-pharyngienne, caractéristiques de L. scotica, n'a pu être observée compte-tenu de l'absence de préservation ou du mauvais état de conservation de ces régions sur les spécimens étudiés. La morphologie et le pattern de la squamation de la nageoire caudale ont été étudiés dans le détail et la constitution écailleuse des rayons caudaux a été analysée. Le pattern de la squamation rostrale est considéré comme représentatif de L. scotica.

Keywords: Thelodonti, articulated squamation, thelodonts, early vertebrates, Lower Silurian, Scotland, Thelodonti, squamation complète, thélodontes, vertébrés inférieurs, Silurien intérieur, Écosse

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