Abstract

Here, we present the first complete mitochondrial genome within the gastropod family Pachychilidae, using the viviparous freshwater snail Tylomelania sarasinorum. This species is a representative member of the lacustrine Tylomelania radiations of the Malili-Lakes-System (Sulawesi, Indonesia). The mitochondrial genome was 16,632 bp long and contained 13 protein-coding genes, 2 rRNA genes and 22 tRNA genes. A pronounced A + T bias was observed with an overall base composition of 29.5% A, 35.7% T, 18.3% G and 16.6% C. Tylomelania sarasinorum exhibited a novel mitochondrial gene arrangement, differing from all Caenogastropoda mitochondrial genomes published to date.