PERIPATRIC SPECIATION DRIVES
DIVERSIFICATION AND DISTRIBUTIONAL
PATTERN OF REEF HERMIT CRABS
We sequenced COI, 16S, and H3 gene regions for ∼90% of 56 putative species, including
nine undescribed, “cryptic” taxa, and mapped their distributions. Speciation in Calcinus is largely peripatric at remote locations.
Allopatric species pairs are younger than sympatric ones, and molecular clock analyses suggest that >2 million years are neededfor secondary sympatry. Substantial niche conservatism is evident within clades, as well as a few major ecological shifts between sister species.
Color patterns follow species boundaries and evolve rapidly, suggesting a role in species recognition. Most species
prefer and several are restricted to oceanic areas, suggesting great dispersal abilities and giving rise to an ocean- centric diversity pattern.
Calcinus diversity patterns are atypical in that the diversity peaks in the west-central oceanic Pacific rather than in the Indo-Malayan “diversity center.
” Calcinus speciation patterns do not match well-worn models put forth to explain the origin of
Indo-West Pacific diversity, but underscore the complexity of marine diversification.
PERIPATRIC SPECIATION DRIVES
DIVERSIFICATION AND DISTRIBUTIONAL
PATTERN OF REEF HERMIT CRABS
We sequenced COI, 16S, and H3 gene regions for ∼90% of 56 putative species, including
nine undescribed, “cryptic” taxa, and mapped their distributions. Speciation in Calcinus is largely peripatric at remote locations.
Allopatric species pairs are younger than sympatric ones, and molecular clock analyses suggest that >2 million years are neededfor secondary sympatry. Substantial niche conservatism is evident within clades, as well as a few major ecological shifts between sister species.
Color patterns follow species boundaries and evolve rapidly, suggesting a role in species recognition. Most species
prefer and several are restricted to oceanic areas, suggesting great dispersal abilities and giving rise to an ocean- centric diversity pattern.
Calcinus diversity patterns are atypical in that the diversity peaks in the west-central oceanic Pacific rather than in the Indo-Malayan “diversity center.
” Calcinus speciation patterns do not match well-worn models put forth to explain the origin of
Indo-West Pacific diversity, but underscore the complexity of marine diversification.
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