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Molecular Biology and Evolution 19:118-121 (2002)
© 2002 Society for Molecular Biology and Evolution

Toward the Monophyly of Haeckel's Radiolaria: 18S rRNA Environmental Data Support the Sisterhood of Polycystinea and Acantharea

Purificación López-García, Francisco Rodríguez-Valera and David Moreira

Université Pierre et Marie Curie, Paris
División de Microbiología, Universidad Miguel Hernández, San Juan de Alicante, Spain

In 1887, Ernst Haeckel published a monumental and amazingly illustrated monograph describing several thousand different radiolarian species, which had been collected during the 4-year journey (1872–1876) of the British oceanographic corvette H.M.S. Challenger (Haeckel 1887Citation ). Radiolaria consist of diverse marine planktonic protists, mostly unicellular, usually endowed with complex, conspicuous mineral skeletons. Haeckel applied the term Radiolaria to three different groups: Acantharea, Polycystinea (Spumellaria and Nassellaria), and Phaeodarea. All of them are united by the possession of a central capsule defining an intracapsular and an extracapsular region in the cytoplasm, and some of them, (all Acantharea and several Spumellaria), also by the ability to secrete strontium sulfate (SrSO4) (Anderson 1983Citation ). This led some contemporary authors to classify, as Haeckel did one century ago, Acantharea, Polycystinea, and Phaeodarea within a common group (Cavalier-Smith 1987Citation ). Nevertheless, a recent study based on the phylogenetic analysis of small subunit ribosomal RNA . . . [Full Text of this Article]

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