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A new species of Gambierdiscus (Dinophyceae) from the south-west Pacific: Gambierdiscus honu sp. nov.

journal contribution
posted on 2023-05-03, 14:11 authored by Lesley Rhodes, Kirsty Smith, Arjun Verma, Belinda Curley, Tim Harwood, Sam Murray, Gurjeet Kohli, Dorothy Solomona, Teina Rongo, Rex Munday, Shauna Murray
Two isolates of a new tropical, epiphytic dinoflagellate species, Gambierdiscus honu sp. nov., were obtained from macroalgae sampled in Rarotonga, Cook Islands, and from North Meyer Island, Kermadec Islands. Gambierdiscus honu sp. nov. had the common Gambierdiscus Kofoidian plate formula: Po, 3′, 6″, 6C?, 6 or 7S, 5‴, 1p and 2⁗. The characteristic morphological features of this species were its relatively small short dorsoventral length and width and the shape of individual plates, in particular the combination of the hatchet-shaped 2′ and pentagonal 3′ plates and the length to width ratio of the antapical 1p plate. The combination of these characteristics plus the smooth thecal surface and equal sized 1⁗ and 2⁗ plates differentiated this species from other Gambierdiscus species. The phylogenetic analyses supported the unique description. Both isolates of G. honu produced the putative maitotoxin (MTX)-3 analogue, but neither produced ciguatoxin (CTX) or MTX. Extracts of G. honu were shown to be highly toxic to mice by intraperitoneal injection (0.2 mg/kg), although less toxic by gavage. It is possible that toxins other than putative MTX-3 are produced.

History

Rights statement

© 2017 Elsevier B.V. All rights reserved.

Language

  • English

Does this contain Māori information or data?

  • No

Publisher

Elsevier

Journal title

Harmful Algae

ISSN

1568-9883

Citation

Rhodes, L., Smith, K. F., Verma, A., Curley, B. G., Harwood, T., Murray, S., Kohli, G. S., Solomona, D., Rongo, T., Munday, R., & Murray, S. A. (2017). A new species of Gambierdiscus (Dinophyceae) from the south-west Pacific: Gambierdiscus honu sp. nov. Harmful Algae, 65, 61–70. doi:10.1016/j.hal.2017.04.010

Contract number

A20330

Job code

14438

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