First record of the genus Hildenbrandia (Florideophyceae: Hildenbrandiales) from French Polynesia and description of H. tahitiensis sp. nov

Type Article
Acceptance Date 2021-07 IN PRESS
Language English
Author(s) Vieira ChristopheORCID1, Akita Shingo1, 2, Kim Yi SunORCID3, Shimada Satoshi2, Kawai Hiroshi1, Zubia MayalenORCID4
Affiliation(s) 1 : Kobe University Research Center for Inland Seas, Rokkodai 1-1, Kobe 657-8501, Japan
2 : Ochanomizu University, Department of Biology, Ohtsuka 2-1-1, Bunkyo-ku, Tokyo 112-8610, Japan
3 : Université Paris Sud, Master Bioinformatique et Biostatistiques (BIBS), Orsay, France
4 : UMR EIO (UPF-IRD-ILM-IFREMER), Université de la Polynésie française, LabEx « Corail », BP 6570, 98702 Faa’a, Tahiti, French Polynesia
Source Journal of Asia-Pacific Biodiversity (2287884X) (Elsevier BV) In Press
DOI 10.1016/j.japb.2021.07.008
Keyword(s) 18S rDNA, freshwater algae, molecular taxonomy, new taxa, phylogenetics, rbcL
Abstract

Freshwater specimens of an encrusting red alga were collected from rivers in Tahiti, French Polynesia. Observed morphological features corresponded to those of the genus Hildenbrandia (Hildenbrandiales, Florideophyceae), confirmed by genetic data. rbcL and 18S rDNA sequences of the Tahitian specimens were 4.95-5.15 % and 0.94 %, respectively, identical to those of a specimen from the Philippines. The Tahitian and Philippine lineages formed a well-supported monophyletic clade, which positioned basally to the rest of the freshwater Hildenbrandia clade. Tahitian specimens cells were 7.6-16.2 μm in diameter in surface view, rectangular in cross-section, 11.6-16.4 μm long and 2-3 μm high, and presented filaments 37-240 μm long, occasionally branching. While the cells were overall wider than in other freshwater Hildenbrandia species, no other outstanding morphological differences were observed between the Tahitian and other species of Hildenbrandia. The genetic divergences and longer cell sizes between the Tahitian and Philippine lineages strongly indicated they were not conspecific. A formal description of the new species, Hildenbrandia tahitiensis sp. nov., is provided. This is the first report of the genus Hildenbrandia from French Polynesia. The present documentation of Hildenbrandia in a South Central Polynesian locality extends our knowledge of the geographical range for this genus.

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Vieira Christophe, Akita Shingo, Kim Yi Sun, Shimada Satoshi, Kawai Hiroshi, Zubia Mayalen First record of the genus Hildenbrandia (Florideophyceae: Hildenbrandiales) from French Polynesia and description of H. tahitiensis sp. nov. Journal of Asia-Pacific Biodiversity IN PRESS. Publisher's official version : https://doi.org/10.1016/j.japb.2021.07.008 , Open Access version : https://archimer.ifremer.fr/doc/00707/81881/