Calviria Martens and Curini-Galletti, 1993

Diagnosis. Protandric Calviriidae . Epidermis with intra-epithelial nuclei. With a septum in front of the pharynx and a sphincter around the gut above it. Numerous large hyaline vacuoles under the body wall. A single seminal vesicle filled with large sperm. The copulatory organ is directed forwards with atrial needles arranged in a ring. Accessory glandular organ separated and in front of the male atrium. Simple female system with both ovovitelloducts opening in a short female duct and with or without bursa.

Type species: Calviria solaris Martens and Curini-Galletti, 1993 .

Other species: C. sublittoralis Martens and Curini-Galletti, 1993 and C. banyulensis Martens and Curini-Galletti, 1993 .

Remarks. All three species have four needles in the accessory organ, which is (apparently) not connected to the exterior. Only C. solaris has a small terminal bursa in the female system.