Some little-known species of hydroids (Cnidaria: Hydrozoa: Lafoeidae) and description of Papilionella pterophora gen. nov., spec. nov. (Sertulariidae)

Redescriptions are given of two species of North Pacific Lafoeidae and diagnosis and description of a new genus and species of the family Sertulariidae, Papilionella pterophora gen. nov., spec. nov. Alexander Antsulevich, Hydrobiology Laboratory, Institute of Biology, St. Petersburg State University, 16 Liniya 29, St Petersburg 199178, Russia.