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Molecular techniques have become important tools to investigate cryptic diversity and phylogeographic patterns. Mitochondrial markers have revealed that the temperate red alga  Asparagopsis armata  contains two cryptic clades. The  A. armata  species complex is native to Australia and New Zealand and has been introduced around the world, particularly to Europe. Previous sequencing has focused on  A. armata  outside of its native range, and there are few sequences available from Australia and New Zealand. Our study investigated cryptic diversity and phylogeographic patterns for over 60 individuals from 7 locations around New Zealand using the mitochondrial  cox 2-3 spacer and plastid  rbc L markers, and found that both cryptic clades within  A. armata  (L1 and L2) can be found in New Zealand. For the first time, our study has revealed haplotype variation (A and B) within each of the two cryptic  A. armata  clades.  Asparagopsis armata  L1A has been found in Australia, Europe and South Africa and is the only invasive lineage currently known, while  A. armata  haplotype L1B is found throughout New Zealand. In addition,  A. armata  L2A has been found only in Australia, and  A. armata  L2B has a southern distribution in New Zealand. The two mitochondrial lineages from New Zealand (L1B and L2B) were found to coexist in several locations. Further work is needed to characterize any differences in the morphology, physiology and biochemistry of the four genetically distinct mitochondrial lineages within the two cryptic clades, as well as their geographic and ecological distributions.

Cryptic diversity and phylogeographic patterns in the Asparagopsis armata species complex (Bonnemaisoniales, Rhodophyta) from New Zealand