Internal sack of Calomera spp.: 77, 81 C. aulica aulica 78, 82 C. littoralis aulicoides 79, 83 C. littoralis winkleri 80, 84 C. littoralis nemoralis 77–80 right lateral view 81–84 dorsal view; BLR basi-lateral right bladder; BLL basi-lateral left bladder; VA – ventro-apical bladder; mt – median tooth. Scale bar: 1 mm.