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A review of zoanthid nematocyst types and their population structure

  • J. S. Ryland
  • J. E. Lancaster
Part of the Developments in Hydrobiology book series (DIHY, volume 178)

Seven different types of nematocyst are detailed and illustrated from the Zoanthidea. We studied the size population structure of nematocyst capsules: how they are affected by preservation, and how and what should be measured. Populations of two types, large holotrichs and p-mastigophores, from the mesenterial filaments of Protopalythoa heliodiscus and Pr. mutuki have been compared using length, width, and (for p-mastigophores) shaft length. The analysis employed bivariate scattergrams and discriminant analysis. The two species are strongly differentiated by their holotrichs, less well by their p-mastigophores. The problem of bimodal size distributions is considered and resolved. It is recommended that nematocyst capsule population descriptors should always be included in species’ descriptions, in addition to or instead of the customary minimum-maximum range.

Key words: Cnidaria, Hexacorallia, Palythoa, Protopalythoa, cnidae, capsules, discriminant analysis

Keywords

Discriminant Analysis Great Barrier Reef Polyp Size Bimodal Size Distribution Shaft Length 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • J. S. Ryland
    • 1
  • J. E. Lancaster
    • 1
  1. 1.School of Biological SciencesUniversity of Wales SwanseaUK

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