Description: Shell médium to large (30 70 mm), with up to 11 teleoconch whorls, with médium to long, straight, siphonal canal (0.20 0.31 of SL), fusiform with weak shoulder. Suture impressed or shallowly narrowly channelled. Protoconch multispiral, of about 3.5-4 whorls; upper 2.5 whorls smooth, last one with axial riblets. Subsutural cord moderately pronounced (occupying less than half the width of the subsutural ramp: D. hastula) or absent (D. deshayesii); when present with two to three unequal ridges, second abapical strongest. Below subsutural cord on subsutural ramp, two to three equal, narrow but distinct cords. In D. deshayesii, subsutural ramp covered with closely spaced, narrow, equal cords. Peripheral cord narrow, gemmate on first 1-1.5 teleoconch whorls, smooth on later whorls. Shell base with equally developed major spiral cords, with thinner intermedíate cordlets between major ones; spiral to oblique cords throughout siphonal canal. Anal sinus narrow and deep, on peripheral cord. Aperture (without canal) 0.22 0.25 of SL. Shell from white with brownish spots and darker speckles on ma-jor cords to uniformly yellowish-orange. Radula (comprising about 40-50 transverse rows of teeth. Marginal teeth narrow, shoe-shaped; central formation weakly developed, with short, ob-tuse central cusp and lateral extensions with distinct, nearly straight anterior margin and indistinct lateral and posterior margins.

Etymology: The name combines the Latin decipere (adjective deceptus)—to beguile, to cheat—and Gemmula to reflect the false re-semblance of this genus to Unedogemmula.

Remarks: The two species that are presently attributed to the genus Deceptigemmula are characterized by narrow fusiform shells with long attenuated, straight siphonal canal. Nevertheless, they difFer notably in the sculpture pattern. While D. hastula has a strong subsutural cord, distinct peripheral and rather strong primary cords on shell base, the sculpture of D. deshayesii is formed by rather uniform, closely spaced cordlets, covering the entire shell surface and without a distinct subsutural cord.
In shell shape and sculpture pattern, Deceptigemmula is most similar to some species of Unedogemmula with a non-gemmate peripheral cord. The radulae of the two genera are also similar, although Unedogemmula usually lacks the central formation. No clear morphological distinction can be drawn between the two genera, which are however unrelated according to the exon-capture analysis.

Distribution: Deceptigemmula deshayesii occurs from Japan to China and the Philippines in 15-55 m. Deceptigemmula hastula occurs from the Persian Gulf to the Philippines, New Caledonia and Vanuatu in 60 120 m.