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A review of zoanthid nematocyst types and their population structure

Authors
  • Ryland, J. S.1
  • Lancaster, J. E.1
  • 1 University of Wales Swansea, Swansea, SA2 8PP, UK , Swansea
Type
Published Article
Journal
Hydrobiologia
Publisher
Springer-Verlag
Volume
530-531
Issue
1-3
Identifiers
DOI: 10.1007/s10750-004-2685-1
Source
Springer Nature
Keywords
License
Yellow

Abstract

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.

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