A rosette by any other name : species diversity in the Bangiales (Rhodophyta) along the South African coast

ABSTRACTThe Bangiales is an order of Rhodophyta, widely distributed around the globe and best known for its economic value in the nori industry. The morphological simplicity of the group offers limited distinguishing characters for species identification. We therefore delimited species of the Bangiales along the South African coast based on two unlinked loci, the mitochondrial cox1 gene and the plastid rbcL gene, supplemented with additional sequence data from a third gene, the nuclear nSSU. Application of DNA-based species delimitation methods including the Automatic Barcode Gap Discovery (ABGD), General Mixed Yule Coalescent (GYMC) and Poisson Tree Processes (PTP), resulted in the recognition of 10 Porphyra and three Pyropia species in South Africa, only three of which had been previously described. Additional species of Bangiales previously recorded along the South African coast were added to our final species list despite not being found in the present study, resulting in an estimate of 14–16 Bangiale...