Shell up to 90 mm in length, up to 7 teleoconch whorls. Protoconch unknown. Axial sculpture of last whorl with 6, occasionally 7, broad, high, rounded, strong varices, each with one short, usually abapically bent spine at shoulder. Spiral sculpture of few low cords, and numerous, squamous threads. Aperture broad, rounded. Outer lip strongly crenulate, briefly lirate within. Columellar lip broad, smooth. Siphonal canal broad with very apparent previous canals, medium-sized, strongly recurved backward, open. Dirty-white or light tan, occasionally with brown spiral bands. Aperture white, columellar lip glossy white or light pink.

Hexaplex pecchiolianus is confused with H. kuesterianus (Tapparone Canefri, 1875) in some
private collections, but H. kuesterianus always has short, open spines on the siphonal canal whereas H. pecchiolianus does not. Turkish specimens of H., pecchiolianus were commented on and illustrated by Enzenross & Niedcrhofer (1990), Engl (1995) and Brunetti et al (1998). A fossil specimen was illustrated by Inzani & Bertarelli (1985: 27, pl. 3, Figs 5-6). The question whether it deserves specific rank or whether it is only a form of H. trunculus is still open. There is another example of such a form with abapically bent spines in Hexaplex: H. depressospinosus (Dunker, 1869) which is a form of H. cichoreum (Gmelin, 1791). But in this particular case the form depressospinosus is not confined to a restricted area.
At present, I am not aware of that form in other localities in the Mediterranean. H. pecchiolianus differs from H. trunculus in having a broad, convex shoulder, abapically bent shoulder spines on all whorls, stronger, higher axial varices, broader columellar lip, and broader siphonal canal with more apparent previous canals. Most of the specimens also are uniformly whitish, compared to the banded H. trunculus.

Fossil records: Pliocene, Central Italy and Sicily. Recent: Turkey, Gulf of Iskenderun (Karatas, Yumurtalik, Dortyol, Yacacik), at 1-90 m.