An elongated, somewhat cylindrical gastropod, B. fulvipunctata has an internal, very thin shell.
Its body is divided into a cephalic shield and a visceral hump which is, partly covered by a posterior mantle shield.
The cephalic shield has its anterior edge wider than the posterior point and it is roughly divided.
The eyes are situated on the front of the head and almost invisible as they are obscured by the dorsal surface.
The mouth is flanked on either side by a mound which is covered in sensory bristles.
The animal's foot is expanded into two lateral parapodia.
The two long and symmetrical parapodia fold over and partially cover the dorsal surface.
A pair of tapering lobes extend from the rear of the mantle shield, the left one is longer while the right lobe is much shorter.

This species typically has a background colour of black or dark brown with a bluish sheen marked with yellowish or orange spots, although some specimens are reddish brown with small yellow spots.
A distinguishing feature is a white mark shaped like the letter w across the anterior edge of the head, although this may only be partially visible on some specimens, and a white or pale yellow crescent-shaped spot at the posterior edge of the head shield.
They are normally between 10–20 millimetres (0.39–0.79 in) in length and in Australia they do not normally exceed 18 millimetres (0.71 in) but in the Mediterranean specimens of 33 millimetres (1.3 in) have been recorded.
An elongated, somewhat cylindrical gastropod, B. fulvipunctata has an internal, very thin shell. Its body is divided into a cephalic shield and a visceral hump which is, partly covered by a posterior mantle shield. The cephalic shield has its anterior edge wider than the posterior point and it is roughly divided. The eyes are situated on the front of the head and almost invisible as they are obscured by the dorsal surface. The mouth is flanked on either side by a mound which is covered in sensory bristles. The animal's foot is expanded into two lateral parapodia. The two long and symmetrical parapodia fold over and partially cover the dorsal surface. A pair of tapering lobes extend from the rear of the mantle shield, the left one is longer while the right lobe is much shorter.
This species typically has a background colour of black or dark brown with a bluish sheen marked with yellowish or orange spots, although some specimens are reddish brown with small yellow spots. A distinguishing feature is a white mark shaped like the letter w across the anterior edge of the head, although this may only be partially visible on some specimens, and a white or pale yellow crescent-shaped spot at the posterior edge of the head shield. They are normally between 10–20 millimetres (0.39–0.79 in) in length and in Australia they do not normally exceed 18 millimetres (0.71 in) but in the Mediterranean specimens of 33 millimetres (1.3 in) have been recorded.
Biuve fulvipunctata