The study of species boundaries in areas of sympatry provides important insight into speciation processes. We investigated whether (i) two sympatric holothurians, Holothuria scabra and H. s. var. versicolor constituted species, and (ii) specimens of intermediate phenotype hybrids. Results from allozyme and 16S mtDNA sequence analyses indicated these two sea cucumbers to be distinct but young biological and phylogenetic species.
Natural hybridisation does not dissolve species boundaries in commercially important sea cucumbers.
Uthicke, S., Purcell, S.W., Blockmans, B. Australian Institute of Marine Science/WorldFish Center (2005)
Biological Journal of the Linnean Society 85: 261-270