Newnesia, E. A. SMITH, 1902

NEWNESIA E. A. SMITH, 1902 View in CoL

Type species: Newnesia antarctica E. A. Smith, 1902 ; by monotypy.

Diagnosis: Shell external, globose, thin; apical area flattened, with large aperture. Broad cephalic shield, posterolateral cephalic lobes present. Tentacular processes absent. Parapodia absent. External sperm groove present, running laterally on right side of body from gonopore to penial aperture. Pedal gland furrow present or not. Sharp unicuspidated rachidian teeth with two to eight denticles along sides, lateral teeth present or not. Jaws and gizzard plates absent. Cuticularized and spinous gizzard. Male reproductive system tubular; prostate short; penial papilla uni- or bilobed. Two gills; one lying on roof and one on floor of mantle cavity. Two repugnatorial glands present, one placed on left anterolateral side, without a distinctive funnel connected to the outside, the other on right posterolateral side right after mantle cavity (infrapallial lobe).