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Journal of Paleontology

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MORPHOLOGY AND ONTOGENY OF AN EARLY DEVONIAN PHACOPID TRILOBITE WITH REDUCED SIGHT FROM SOUTHERN THAILAND

¹ USTL Sciences de la Terre, Laboratoire de Paléontologie et Paléogéographie du Paléozoïque, UMR 8014 et FR 1818 du CNRS, 59655 Villeneuve d'Ascq Cedex, France, <catherine.cronier{at}univ-lille1.fr>
² Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom, <raf{at}nhm.ac.uk>

Exuviae comprising immature growth stages allow the tracing of morphological and morphogenetical features of the reduced-eyed phacopid species Plagiolaria poothaii Kobayashi and Hamada, 1968, from the Early Devonian of Satun Province, southern Thailand. Biometric and morphometric approaches have been used to characterize the shape changes. This is the fourth phacopid genus for which ontogenetic information is known. Ontogenetic features of this species are generally similar to those of Phacops and Weyerites. However, the ankylosis of the facial sutures occurs at the end of the meraspid period, later than in Phacops, and this is probably a derived character.

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