Abstract
Molluscs in general, and bivalves in particular, exhibit an extraordinary degree of mitochondrial gene order variation when compared with other metazoans. The complete mitochondrial genome of Solen grandis (Bivalvia: Solenidae) was determined using long-PCR and genome walking techniques. The entire mitochondrial genome sequence of S. grandis is 16,784 bp in length, and contains 36 genes including 12 protein-coding genes (atp8 is absent), 2 ribosomal RNAs, and 22 tRNAs. All genes are encoded on the same strand. Compared with other species, it bears a novel gene order. Besides these, we find a peculiar non-coding region of 435 bp with a microsatellite-like (TA)(12) element, poly-structures and many hairpin structures. In contrast to the available heterodont mitochondrial genomes from GenBank, the complete mtDNA of S. grandis has the shortest cox3 gene, and the longest atp6, nad4, nad5 genes.
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