Dugesia species have an elongated body with a slightly triangle-shaped head. They often have grey, brown, or black dorsal color, whereas the ventral surface is usually paler. These animals have a couple of eyes constituted by a multicellular pigmented cup with many retinal cells to detect the amount of light in the nearby environment. Sometimes they present supernumerary eyes. At the anterior part of the body, behind the eye level, they have a pair of structures called
auricles that give the triangle look to the 'head' and allow them to detect the intensity of water current. These auricles are free of pigment and
rhabdites. Each side of the anterior margin of the head has between 5 and 10 shallow sensory fossae, their number depending on the species or the individual. The sensory fossae and the auricle grooves are supplied with many nerve endings. The digestive system of
Dugesia contains a central, non-pigmented tubular
pharynx. Like the other triclads, the gut consists of three branches, one anterior and two posterior. Each branch consists of caeca, which deliver the
nutrients to the body. The gut lacks a separate opening for waste excretion. The subepidermal musculature of
Dugesia is divided into four layers. Ball proposed that the presence of this glands was a
synapomorphy of
Dugesia and
Neppia. The absence of these glands in some
Neppia species (
N. jeanneli,
N. montana and
N. schubarti) is thought to be a secondary loss. ==Reproduction==