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The term ‘eucheumatoids’ designates a group of genera in the family Solieriaceae that are the source of some of the most valuable algal products in cultivation. While economically important in the tropics, much of its taxonomy is yet to be fully resolved. The eucheumatoid species  Mimica arnoldii  is a Batesian mimic of corals that was recently transferred to its own genus from  Eucheuma  based primarily on peculiarities of habit and a lack of medullary rhizoids, in contrast to the generitype  Eucheuma denticulatum  that has the latter. We studied the diversity of  Mimica arnoldii  from samples collected in the Philippines to determine their genetic variation, relationships to other eucheumatoids, and whether its two distinct morphological expressions, which have been named as varieties, are genetically different. We produced a phylogeny using a three-gene concatenated dataset, and used the variable mitochondrial  cox 2-3 spacer to determine intraspecific variation and the degree of correlation between sequence-variation and varietal status. Our results showed that  Mimica  is a distinct genus, and that intra-specific molecular data did not correspond to the morphology-based varieties, although it did correlate with geographical distribution. Our results also indicate that  Kappaphycus , as presently circumscribed, contains species with ( Kappahycus alvarezii, K. striatus  and  K. malesianus ) and without ( Kapppahycus cottonii ) internal medullary hyphal core, and that  K. cottonii  is sister to the remaining  Kappaphycus  species. We thus propose  Kappaphycopsis gen. nov . for  K. cottonii  for the species of  Kappaphycus  without internal medullary rhizoids (anaxiferous).

phycologia

Phylogeny and genetic diversity of the Philippine eucheumatoid genus  Mimica  (Solieriaceae, Rhodophyta), and the proposal for  Kappaphycopsis gen. nov . to include the anomalous species of  Kappaphycus, K. cottonii