Morphological links in an evolutionary sequence of the Cretaceous ammonite genus Metoicoceras Hyatt |
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Authors: | Metoicoceras |
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Institution: | a Paleozoologiska Avdelningen, Naturhistoriska Riksmuseet, Box 50007, 10405, Stockholm, Sweden;b Oxford University Museum of Natural History, Parks Road, Oxford, OX1 3PW, UK |
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Abstract: | Species of the ammonite genus Metoicoceras are not generally strongly differentiated with respect to coiling and ornament. The present study addresses the problem of how well purely visual (subjective) identification succeeds in identifying taxonomically and hence evolutionarily relevant differences between forms. Multivariate statistical analysis, based on coiling, standard dimensions of the conch and ornamental properties, indicates that quantitative procedures reproduce traditional methods to a conspicuous degree, with the added advantage of objective repeatability. Additionally, uncertain phylogenetic relationships could be resolved by appropriate methods of multivariate statistical analysis and possible new information on dimorphism in the conch was obtained. |
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Keywords: | multivariate analysis compositional data dimorphism evolution Metoicoceras Cenomanian North America |
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