Phylogeny of lamniform sharks (Chondrichthyes: Elasmobranchii) and the contribution of dental characters to lamniform systematics
作者： KENSHU SHIMADA
DOI: 10.2517/PRPSJ.9.55
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摘要: ABSTRACT Lamniform sharks (Chondrichthyes: Elasmobranchii) are common in the fossil record but represented mainly by isolated teeth. A phylogenetic analysis of 15 extant lamniform species based on 42 morphological characters using Scyliorhinus (Carcharhiniformes) as an outgroup produces a consensus tree with following generic relationships: [Mitsukurina + [Carcharias Odontaspis Pseudocarcharias Megachasma [Alopias [Cetorhinus [[Isurus Carcharodon] Lamna]]]]]. When extinct form, Cretoxyrhina mantelli, is added to analysis, taxon occurs within Alopias clade. Comparisons among cladogram 29 non-dental alone, that 19 dental characters, and combined (48) suggest provide at least some signal. Mapping quantitative data suggests 1) decrease number tooth rows through phylogeny, 2) possible relation...
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