Raphitoma erronea: Shell biconic, elongated, scalariform and nearly 2.3 times as long as wide. Blunt and multispiral protoconch, mean 560 µm wide and 640 µm high, of 2.75 highly cancellated and convex whorls. The cancellation starts straight from the nucleus while the last whorl exhibits a weak keel before the onset of the protoconch. Protoconch I of mean 1.2 whorls and mean 310 µm in diameter. Teleoconch with 6.0 convex whorls exhibiting a slight shoulder immediately below the deep suture. Body whorl almost 60% and bears 15-16 orthocline axial ribs with interspaces approximately as wide as the ribs. Spiral decoration with cords some wider of which alternating with more numerous thinner ones and forming ambient tubercles at the crossings with the ribs. Aperture slightly more than 40%, elongated and with a short tail. Columella smooth and sinuous. Outer lip simple and thickened, anterior siphonal canal short and wide, posterior one deep and wide. Background color beige or yellowish to chocolate-brown turning lighter towards the body whorl, with darker smudges arranged in an irregular manner, with a whitish spiral band on the middle of the spire, of lighter color the tubercles at the crossings between the ribs and the cords, while the protoconch is either light beige or lemon-yellow. Protoconch nucleus whitish.

Raphitoma erronea: Some species of the genus Raphitoma, such as R. concinna (Scacchi, 1836) and R. leufroyi (Michaud, 1828), are very similar to R. erronea but, apart from having a protoconch with more whorls, they also have a different sculpture of the teleoconch. It is also often erroneously identified as Pleurotomella demosia (Dautzenberg & Fischer, 1896) but the latter has 1 whorl less on its protoconch and a longer tale of the teleoconch .