Variability of ooeciostome shape and position in antarctic idmidroniform bryozoans (bryozoa: Cyclostomatida)

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Abstract

Variability in the shape and position of the ooeciostome in Antarctic idmidroniform cyclostome bryozoans is described in detail. All characters analysed (size and shape of ooeciostome and ooeciopore, ooeciostome position, orientation of ooeciopore) exhibit variability. Therefore, they may be categorized as useful rather than diagnostic taxonomic characters. Recent idmidroniform bryozoans are arranged in a morphoseries reflecting some possible stages in the evolution of the ooeciostome. Possible trends include loss of terminal position, length decrease, increased curvature and flattening. The ooeciostome of Idmidronea fraudulenta Ostrovsky & Taylor, 1996 is studied by SEM for the first time.

Original languageEnglish
Pages (from-to)97-106
Number of pages10
JournalZoologischer Anzeiger
Volume237
Issue number2-3
Publication statusPublished - Dec 1998
Externally publishedYes

Austrian Fields of Science 2012

  • 106054 Zoology

Keywords

  • Evolution
  • Exidmonea
  • Gonozooid
  • Idmidronea
  • Taxonomy
  • Variability

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