 His preferred vase forms are amphorae and hydriae.He received his name from a representation of a fight between the river god, Acheloos, and Heracles, on formerly Amphora F 1851 in the Berlin Antique collection, now missing.In this comic depiction, the screaming and frightened river god, in the form of a horned centaur, is being kept from escaping by an unflustered Herakles pulling him back by the horns.