The taxonomic status ofTheragra finnmarchicaKoefoed, 1956 (Teleostei: Gadidae): perspectives from morphological and molecular data

Autor:	D. J. Rees, I. Byrkjedal, Jørgen S. Christiansen, Svein-Erik Fevolden
Rok vydání:	2008
Předmět:	Teleostei biology Osteology Ontogeny Zoology Anatomy Aquatic Science Gadidae Theragra biology.organism_classification Taxon Discriminant function analysis Taxonomy (biology) Ecology Evolution Behavior and Systematics
Zdroj:	Journal of Fish Biology. 73:1183-1200
ISSN:	1095-8649 0022-1112
DOI:	10.1111/j.1095-8649.2008.01958.x
Popis:	The gadoid fishes Theragra finnmarchica from the coast of northern Norway and Theragra chalcogramma from the north-east Pacific could not be taxonomically discriminated by sequencing the mitochondrial cytochrome c oxidase I (COI) gene. However, the taxa differed in 10 of 42 non-osteological and in four of 17 osteological characters. Ontogenetic changes were found for 16 of the examined non-osteological characters. Five taxon-specific characters, unaffected by ontogenetic scaling, were examined by discriminant analysis. A 100% correct classification was obtained from a discriminant function based on number of pyloric caeca and number of gill rakers on the upper part of the gill arch. However, all examined characters overlapped between the two taxa, except the number of pyloric caeca. On the basis of their genetic similarity and slight morphological differences, T. finnmarchica should be considered a junior synonym of T. chalcogramma.
Databáze:	OpenAIRE
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