Morphological and molecular studies in the genus Hypnea (Rhodophyta) in Australia: Hypnea decipiens sp. nov . and Hypnea subramentacea sp. nov

John M. Huisman; Joanna Young; Rachel M. Binks; Katherine M. Taylor; Gary W. Saunders

doi:10.1080/00318884.2025.2494286

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Morphological and molecular studies in the genus Hypnea (Rhodophyta) in Australia: Hypnea decipiens sp. nov . and Hypnea subramentacea sp. nov

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Morphological and molecular studies in the genus Hypnea (Rhodophyta) in Australia: Hypnea decipiens sp. nov . and Hypnea subramentacea sp. nov

John M. Huisman, Joanna Young, Rachel M. Binks, Katherine M. Taylor and Gary W. Saunders

Phycologia (Oxford)

2025

DOI: https://doi.org/10.1080/00318884.2025.2494286

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Abstract

COI-5P

<italic>Hypnea musciformis</italic>

<italic>Hypnea valentiae</italic>

<italic>Rbc</italic>L

Molecular analyses (rbcL, COI-5P) of Australian specimens that had previously been identified as Hypnea musciformis based on morphology have revealed that this entity is not that species but rather represents an undescribed cryptic species that is here named Hypnea decipiens sp. nov. The new species is known from south-western and southern Australia, north to the Houtman Abrolhos (Geraldton region) of Western Australia and east to the Eyre Peninsula, South Australia. Plants can be locally common in the shallow subtidal and grow to 14 cm in height, with upper branches terminated by crozier-like hooks. Vegetative, cystocarpic and tetrasporangial plants are known, with the zonate tetrasporangia arising in nemathecia at the basal or median sections of lateral branchlets. Despite the morphological similarities, in phylogenetical analyses H. decipiens did not group with the H. musciformis complex (H. musciformis, H. pseudomusciformis, H. caraibica, H. schneideri), but rather was sister to the South African H. rosea. An additional new species, H. subramentacea sp. nov. is described for specimens from south-western Australia that were sister to the common H. ramentacea.

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Title: Morphological and molecular studies in the genus Hypnea (Rhodophyta) in Australia: Hypnea decipiens sp. nov . and Hypnea subramentacea sp. nov
Authors/Creators: John M. Huisman
Joanna Young
Rachel M. Binks
Katherine M. Taylor
Gary W. Saunders - University of New Brunswick
Publication Details: Phycologia (Oxford)
Publisher: Published with license by Taylor & Francis Group, LLC.
Number of pages: 10
Identifiers: 991005779524107891
Copyright: © 2025 Government of Western Australia.
Murdoch Affiliation: School of Environmental and Conservation Sciences
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 3 Agriculture, Environment & Ecology; 3.2 Marine Biology; 3.2.509 Marine Algae
Web Of Science research areas: Marine & Freshwater Biology; Plant Sciences
ESI research areas: Plant & Animal Science