Five groups within Linckia have been clearly genetically differentiated - L. columbiae, L. bouvieri, two clades within L. guildingi, and one clade with two subclades consisting of both L. laevigata and L. multifora
.

A list of species of Linckia:
Linckia bouvieri Perrier, 1875 (=Linckia formosa)
Linckia columbiae Gray, 1840 (=Ophidiaster colombiae, Phataria fascialis)
Linckia gracilis Liao, 1985
Linckia guildingi Gray, 1840 (=Linckia diplax, Linckia ehrenbergii)
Linckia kuhli von Martens, 1866
Linckia laevigata (Linnaeus, 1758) (=Linckia miliaris)
Linckia multifora (Lamarck, 1816) (=Linckia costae, Linckia leachi, Linckia typus, Ophidiaster multiforis)
Linckia nodosa Perrier, 1875 (=Calliophidiaster psicodelica, Linckia bullisi)
Linckia tyloplax H.L. Clark, 1914
Some sources also give :
Linckia hypnicola
Linckia hystrix
Linckia purpurea
Five groups within Linckia have been clearly genetically differentiated - L. columbiae, L. bouvieri, two clades within L. guildingi, and one clade with two subclades consisting of both L. laevigata and L. multifora
.
A list of species of Linckia:
Linckia bouvieri Perrier, 1875 (=Linckia formosa)
Linckia columbiae Gray, 1840 (=Ophidiaster colombiae, Phataria fascialis)
Linckia gracilis Liao, 1985
Linckia guildingi Gray, 1840 (=Linckia diplax, Linckia ehrenbergii)
Linckia kuhli von Martens, 1866
Linckia laevigata (Linnaeus, 1758) (=Linckia miliaris)
Linckia multifora (Lamarck, 1816) (=Linckia costae, Linckia leachi, Linckia typus, Ophidiaster multiforis)
Linckia nodosa Perrier, 1875 (=Calliophidiaster psicodelica, Linckia bullisi)
Linckia tyloplax H.L. Clark, 1914
Some sources also give :
Linckia hypnicola
Linckia hystrix
Linckia purpurea
Linckia