Rare, divergent Korean Semisulcospira spp. mitochondrial haplotypes have Japanese sister lineages

摘要

Cerithioidean gastropods have mounted two or three separate invasions of freshwater environments and comprise a substantial fraction of global freshwater snail diversity (Strong et al., 2011). Freshwater cerithioideans have been the subject of considerable molecular phylogenetic study, especially using mitochondrial (mt) markers, and such studies typically document a complex pattern of genetic structuring involving pronounced among-species mt non-monophyly (Minton & Lydeard, 2003; Glaubrecht & Khler, 2004; Khler et al., 2004; Khler & Glaubrecht, 2006; Lee et al., 2007; Glaubrecht & Rintelen, 2008; Dillon & Robinson, 2009; Kim et al., 2010; Khler, Panha & Glaubrecht, 2010; Glaubrecht, 2011). The resulting topological/taxonomic incongruencies have been attributed to a number of mechanisms: the presence of cryptic species (Minton & Lydeard, 2003; Kim et al., 2010); incomplete lineage sorting in ancient lineages (Dillon & Robinson, 2009); incomplete lineage sorting in young radiations caused by either rapid speciation or by secondary introgression (Glaubrecht & Khler, 2004; Kohler et al., 2004; Kohler & Glaubrecht, 2006); and introgressive hybridization (Glaubrecht & Rintelen, 2008; Khler et al., 2010; Khler & Deein, 2010).