Two new acotylean flatworms (Polycladida) of two genera unrecorded in the Eastern Atlantic

Abstract

This paper describes two new species of two genera of polyclad flatworms found in the Iberian Peninsula, Parviplana and Phaenoplana. Parviplana jeronimoi sp. nov. is a small-sized polyclad with yellowish-brown background colour and pale yellow ventral body; gonopores well separated, with corrugated ventral body wall between them; and prostatic vesicle with a penis papilla surrounded by a penis sheath, both housed in a wide male atrium. Phaenoplana caetaria sp. nov. is characterised by a yellowish-brown dorsal body, without tentacles, ejaculatory duct projects inside the prostatic vesicle, spherical prostatic vesicle, twisted penis rod, well-developed male atrium and elongated small Lang’s vesicle. This is the first record of the genera Parviplana and Phaenoplana in Europe, as well as in the Eastern Atlantic.