Notogynaphallia nawei

Notogynaphallia nawei is a small-to-medium-sized land planarian with an elongate body, reaching about 40 millimetres (1.6 in) in length. The color of the dorsum is black and the dorsal eyes are perceived as a group of very small whitish dots on about the second fourth of the body. The ventral side is dark gray with a thin whitish median longitudinal line along the body.^[1]

The species lacks a glandular margin, and the prostatic vesicle is intrabulbar with two regions: a tubular proximal portion and a globose distal portion, with a narrow lumen. The female atrium is tubular distally, but wide proximally.^[1]

The specific epithet nawei comes from the Toba word naweĨ, which means "black", and refers to the dorsal color of the species.^[1]

Notogynaphallia nawei is found in native forests of the Formosa Province, Argentina, part of the Gran Chaco region.^[1]