A new genus, Helgoeca gen. nov., for a nudiform choanoflagellate

Barry Leadbeater, R Hassan, M Nelson, M Carr, SL Baldauf

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18 Citations (Scopus)


A new genus, Helgoeca gen. nov., has been designated to accommodate a midiform loricate choanoflagellate (American Type Culture Collection strain ATCC 50073) that was incorrectly attributed to the tectiform genus Acanthoecopsis Acanthoeorbis). The first indication that this species might be nudiform came from a four-gene phylogeny of the choanoflagellates which recovered ATCC 50073 within a strongly supported monophyletic clade comprising two other nudiform taxa. Fortunately an isolate of the species in question was available from the ATCC and when observed in rapidly growing culture it was immediately apparent that this species divided with the production of 'naked' motile cells; a typically nudiform character. The beaker-shaped lorica of this species consists of an outer layer of approximately II longitudinal costae, which terminate anteriorly as spines, and an equal or larger number of helical costae, with a left-handed conformation, each of which terminates anteriorly adjacent to the base of a spine. The pattern of costae in this species is indistinguishable from that of Acanthocorhis nana Thomsen and for this reason A. nana has been transferred to the new genus Helgoeca gen. nov., as the type species. (c) 2008 Elsevier GmbH. All rights reserved.
Original languageEnglish
Pages (from-to)227-237
Number of pages11
JournalEuropean Journal of Protistology
Issue number3
Publication statusPublished - 1 Aug 2008


  • nudiform replication
  • Acanthocorbis unguiculata
  • lorica-construction
  • Helgoeca gen. nov.
  • molecular phylogeny
  • choanoflagellate


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