Amphibalanus sp. (MZB Cru Cir 135) a upper view b side view c external view of scutum and tergum d internal view of scutum and tergum e cirrus I f cirrus II g cirrus III h cirrus IV i cirrus V j cirrus VI k penis l maxilla m maxillule n mandible o mandibular palp. Scale bars: 3 mm (a, b); 1 mm (c–g); 2 mm (h–k); 0.5 mm (l–o).