Molecular evolution and morphological speciation in North Atlantic brachiopods (Terebratulina spp.)

Morphological and molecular differentiation of western and eastern North Atlantic brachiopods were examined by morphometric analysis of six shell characteristics (n= 144), allozyme electrophoresis at six nuclear gene loci (n= 485), and estimation of nucleotide difference by digestion of mitochondrial DNA (mtDNA) with nine restriction endonucleases (n= 96)