Ercolania Trinchese, 1872

Type species: Ercolania siotii Trinchese, 1872, by subsequent designation (Iredale & O’Donoghue 1923).

Diagnosis. According to Baba and Hamatani (1970), Schmekel and Portmann (1982) and Jensen (1985, 1993), the genus Ercolania is characterized by the following features: Presence of cerata, which are fusiform or inflated; digitiform rhinophores, which are circular or slightly flattened in cross-section; elongate or inconspicuous reno-pericardial prominence; presence of sabot-shaped teeth; presence of a curved penial stylet; probably absence of albumen gland in the cerata.