Cyathorobbea hypermnestra

Cyathorobbea hypermnestra View in CoL View at ENA , Cy. ruetzleri and Cy. agricola

The bulbus is wider than long in both Cy. hypermnestra and Cy. agricola and is distinctly asymmetrical in Cy. ruetzleri , i.e. with a more prominent dorsal part featuring a triangular shape in the sagittal section. The bulbus of Cy. hypermnestra is the largest compared to all other investigated species ( Fig. 1g –i View Fig ; Table 1). Within the genus, Cy. agricola has the smallest bulbus ( Fig. 1g –i View Fig ; Table 1). In Cy. hypermnestra the radial myofilaments are delicate and restricted to the anterior and posterior third of the bulbus ( Figs. 1g View Fig and 13b View Fig ). In Cy. ruetzleri , delicate myofilaments are slightly more present in the subventral sectors whereas