Comparative phylogeography and species boundaries in Echinolittorina snails in the central Indo‐West Pacific

摘要: Aim  This study aimed to test monophyly and geographical boundaries in five marine intertidal snail species from the central Indo-West Pacific. We tested prediction that phylogenetic breaks between Indian Pacific Ocean basins should be more pronounced continental than oceanic settings, sought common patterns of interspecific intraspecific region. Location  The tropical seas Pacific. Methods  sequenced over 1200 bp mitochondrial cytochrome oxidase subunit I gene (COI) 18–92 individuals sampled throughout ranges each Echinolittorina (Littorinidae): three members trochoides complex; reticulata; vidua, together with sister species, order boundaries. In addition, 630 bp nuclear 28S rRNA were E. reticulata its millegrana. Phylogenetic structure was assessed using neighbour-joining parsimony analyses. Results  COI data confirmed distributions for all except pair millegrana, which nevertheless reciprocally monophyletic rRNA. ecologically ‘continental’ habitats (E. A but not B) mostly showed strong interoceanic (with age estimates 0.58–4.4 Ma), while ‘oceanic’E. D did not. B occupy shores shelves Southeast Asia Australasia respectively; them lies ‘eastern Indonesian corridor’ occupied by reticulata. widespread vidua a complex pattern deep division into six haplotype clades apparently parapatric distributions. Main conclusions  Our results show ecological differences (in this case vs. habitat) influence both these snails rocky shores. Two restricted Oceans, consistent vicariant separation during Plio-Pleistocene low sea levels. two do breaks, suggesting they maintained connections through eastern corridor. location boundary mirrors reported other species. relationship Australasia, respectively, is an example ‘marine Wallace's line’ distribution, we suggest it result barrier unsuitable habitat.