Taxonomic revision of the genus Herposiphonia (Rhodomelaceae, Rhodophyta) from Korea, with the description of three new species

Abstract

We examined the species diversity of Herposiphonia on Korean coasts, based on a combination of morphology and molecular analyses of the mitochondrial COI-5P DNA barcode marker and plastid rbcL gene. We report the presence of eight species including three novel species: H. donghaensis sp. nov., H. jejuinsula sp. nov., H. sparsa sp. nov., H. caes pitosa, H. fissidentoides, H. insidiosa, H. parca, and H. subdisticha. Specimens were separated into eight clades in both the COI-5P and rbcL gene analyses, with 1.3-19.6 and 6.6-15% interspecific sequence divergence, respectively. These eight species are also distinguishable by several morphological characteristics such as: branching pattern (d/i pattern in H. donghaensis sp. nov. and H. sparsa sp. nov.; d/d/d/i pattern in others), shape of determinate branch (ligulate in H. fissidentoides; terete in others), number of vegetative trichoblasts (1-2 in H. insidiosa and H. sparsa sp. nov.; 3-4 in H. caespitosa; absent in others), and number of segments and pericentral cells in determinate branches. About three novel species revealed by our analyses, H. donghaensis sp. nov. is newly discovered, and H. jejuinsula sp. nov. and H. sparsa sp. nov. were previously reported in Korea as H. nuda and H. secunda, respectively. Our results show that DNA barcoding and rbcL analyses are useful for delimiting species boundaries and discovering cryptic species diversity in the genus Herposiphonia.

Diversity of Kallymeniaceae (Gigartinales, Rhodophyta) associated with Hawaiian mesophotic reefs

“…Nägeli, Gracilaria parvispora I.A. Abbott;Kim et al, 2008;Koh et al, 2018;, and this biogeographic pattern for Psaromenia represents an additional potential link between the two floras.…”

Melanothamnus maniticola sp. nov. (Ceramiales, Rhodophyta): an epizoic species evolved for living on the West Indian Manatee

“…The presence of two divergent rbc L haplotypes within samples that all shared the same COI‐5P sequence was unexpected given the usually greater sequence divergence of the latter locus (e.g., Freshwater et al. , Koh and Kim ). Further sampling is needed to determine the diversity, prevalence, and geographic structure of rbc L haplotypes within the species.…”