Fig 2. Schematic representation (not to scale) of both sexes of both introduced Mytilicola species.

On the left both sexes of M. intestinalis and on the right both sexes of M. orientalis, all viewed from the ventral side, with indications of the body size measurements that were taken. Note the dorsolateral thoracic protuberances which are folded inwards in M. intestinalis and extended outwards in M. orientalis. For detailed drawings see original species descriptions, including views from other sides and close-ups [15, 23]. Drawings with courtesy of Felipe Ribas.