Research paper

Morphologic variation in the P1 element of Mississippian species of the conodont genus Pseudognathodus

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JAVIER SANZ-LÓPEZ
Departamento de Geología, Facultad de Geología, Universidad de Oviedo, c/ Jesús Arias de Velasco s/n, 33005 Oviedo, Spain. sanzjavier@uniovi.es
Corresponding author

SILVIA BLANCO-FERRERA
Departamento de Geología, Facultad de Geología, Universidad de Oviedo, c/ Jesús Arias de Velasco s/n, 33005 Oviedo, Spain. blancosilvia@uniovi.es

C. GILES MILLER
Department of Earth Science, Natural History Museum, Cromwell Road, London SW7 5BD, UK.  G.Miller@nhm.ac.uk

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ABSTRACT

A revision of the Austin Conodont Collection at the Natural History Museum, London, has revealed a diverse assemblage of P1 elements of Pseudognathodus. Pseudognathodus homopunctatus, Ps. lineatus, Ps. mermaidus and Ps. symmutatus are differentiated and a new species, Ps. posadachaconae, is defined from material from North Wales. The systematic of these species is updated. A revised diagnosis is provided for the genus Pseudognathodus, as well as for the species Ps. lineatus and Ps. symmutatus. The types of Ps. symmutatus cannot be differentiated from immature specimens of Ps. homopunctatus. The evolutionary relationships of Pseudognathodus species are discussed. Stratigraphic distribution indicates that diversity increased moderately from the upper Tournaisian and lower Viséan to the upper Viséan (Mississippian, Carboniferous). Pseudognathodus homopunctatus and Ps. symmutatus are widely distributed palaeogeographically whereas Ps. lineatus and Ps. posadachaconae sp. nov. are endemic.

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Key words:Conodont, Pseudognathodus, systematics, Mississippian, Viséan.

How to cite: Sanz-López, J., Blanco-Ferrera, S. & Miller, C.G. 2018. Morphologic variation in the P1 element of Mississippian species of the conodont genus Pseudognathodus. Spanish Journal of Palaeontology, 33 (1), 185-204.

Received 05 October 2017, Accepted 12 January 2018, Published 30 June 2018

https://doi.org/10.7203/sjp.33.1.13248

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