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The molecular phylogenetic status of Elphidium williamsoni (Haynes, 1973) as inferred from partial 18S-rDNA sequences

Martin R. Langer
The molecular phylogenetic status of Elphidium williamsoni (Haynes, 1973) as inferred from partial 18S-rDNA sequences
Journal of Micropalaeontology (December 2001) 20, Part 2: 183

Abstract

Comparative studies on DNA nucleotide sequences have revolutionized our understanding of the phylogenetic relationships of many organisms and have become an important tool in evolutionary, ecological and palaeobiological inquiry. We have analysed partial small-subunit 18S sequences (srDNA) of Elphidium williamsoni (Haynes, 1973), a common intertidal benthic foraminiferid from the North Sea. The molecular phylogenetic analysis of the ribosomal rDNA sequence data indicate that E. williamsoni constitutes a well-defined genetic entity that is closely related to Elphidium aculeatum. Elphidium williamsoni is a prominent and frequently encountered foraminiferid in the North Sea and other tidal flats. It was originally described by Williamson (1858) as Polystomella umbilicata and subsequently renamed by Haynes (1973). Because of its phenotypic similarities with other elphidiids, this species has been frequently confused with, for example E. excavatum or Cribrononion alvarezianum (see Haynes for discussion). The molecular data provided here, and their direct comparison to other benthic foraminifera including one elphidiid, may therefore provide additional insight into the taxonomic status and the validity of this species. Individuals of the foraminiferid Elphidium williamsoni were collected in October 1997 from the intertidal mud flats of the Crildumersiel at the outer Jade Bay near Wilhelmshaven, North Sea (see Langer et al., 1989 for details). The mud flats are characterized by fine-grained, muddy sediments containing high contents of organic material. In the laboratory, specimens were transferred into petri dishes, examined and cleaned under a stereo microscope. Living specimens of E. williamsoni were picked out separately and placed into clean glass dishes containing filtered. . .


ISSN: 0262-821X
EISSN: 2041-4978
Serial Title: Journal of Micropalaeontology
Serial Volume: 20, Part 2
Title: The molecular phylogenetic status of Elphidium williamsoni (Haynes, 1973) as inferred from partial 18S-rDNA sequences
Author(s): Langer, Martin R.
Affiliation: University of Bonn, Institute of Palaeontology, Bonn, Federal Republic of Germany
Pages: 183
Published: 200112
Text Language: English
Publisher: British Micropalaeontological Society, London, United Kingdom
References: 6
Accession Number: 2002-014679
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N53°30'00" - N53°30'00", E08°00'00" - E08°19'60"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200206
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