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A molecular and karyological approach to the taxonomy ofNautilus

Authors
Journal
Comptes Rendus Biologies
1631-0691
Publisher
Elsevier
Publication Date
Volume
327
Issue
2
Identifiers
DOI: 10.1016/j.crvi.2003.12.004
Keywords
  • Nautilus
  • 18S Rdna
  • Karyotype
  • Phylogeny
  • Adnr 18S
  • Caryotype
  • Phylog√©nie

Abstract

Abstract Nautiloids, the externally shelled cephalopods of Cambrian origin, are the most ancient lineage among extant cephalopods. Their ancestral characters are explored based on morphological and molecular data (18S rDNA sequence) to investigate the evolution of present cephalopod lineages. Among molluscs, nautilus 18S rDNA gene is the longest reported so far, due to large nucleotidic insertions. By comparison with other 18S sequences, the complete gene of N. macromphalus helps to clarify the taxonomic status of the three universally recognised Nautilus species. The range of interspecific molecular differences supports separation of the present species into two surviving ectocochleate genera, Nautilus and Allonautilus. Nautiloid 18S is considered as corresponding to the ancestral form of 18S as is the number of chromosomes in Nautilus (52), the lowest among cephalopods. Comparison of karyological characteristics amongst cephalopods in a phylogenetic context suggests a possible correlation between duplication events and lineage divergence. To cite this article: L. Bonnaud et al., C. R. Biologies 327 (2004).

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