Variability of cnidae within a small clonal sea anemone (Isactinia sp.)

Kaposi, Katrina L., Mitchell, Michela L., Courtney, Robert L., and Seymour, Jamie E. (2023) Variability of cnidae within a small clonal sea anemone (Isactinia sp.). Invertebrate Biology, 142 (4). e12413.

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The cnidom and intraspecific variability of cnidae within the small sea anemone Isactinia sp. were verified. The specific cnidae within the cnidom of four discrete morphological structures (tentacle, actinopharynx, mesenterial filaments, and body column) within Isactinia sp. was investigated. Microbasic b-mastigophores, microbasic p-mastigophores, basitrichs, microbasic p-amastigophores, and spirocysts were found in this species. In addition, two morphologically distinct basitrich forms, distinguishable only in a discharged state, were also found, of which basitrichs with the distinctly shorter thread were found predominately only on the body column. The distribution and abundance of cnidae types differed significantly around the body in the sea anemones, as did the length of basitrichs and spirocysts among tissue types. Cnidae length also differed significantly among individuals. Correlations between cnidae length and sea anemone size were variable, whereby cnidae size was significantly negatively correlated to sea anemone size in seven cnidae–tissue combinations, positively correlated in one, and not correlated in two. Linear regression revealed that sea anemone size was able to explain 33%–68% of variation in size of b-mastigophores, p-amastigophores, and small basitrichs from within the mesenterial filaments. Correlations were negligible or not significant in remaining cnidae–tissue combinations, however. While providing key taxonomic cnidae information, this study also highlights the variability of cnidae that may occur within a species of Isactinia.

Item ID: 81264
Item Type: Article (Research - C1)
ISSN: 1744-7410
Keywords: Actiniaria, cnidae, Cnidaria, ecology, intraspecific variation, taxonomy
Copyright Information: © 2023 The Authors. Invertebrate Biology published by Wiley Periodicals LLC on behalf of The American Microscopical Society LLC. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited
Date Deposited: 06 Mar 2024 04:27
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 100%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280102 Expanding knowledge in the biological sciences @ 100%
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