Diagnosis. A Calliostoma species of large size, with a rather elevated, slightly cyrtoconoidal spire, 13 granular spiral cords on last whorl (PI, P2, P3; P4; S2; SI, S3; TI; T2, T3; T4, T5, P'3) with rounded slightly blunt sharp beads, a flat base with 15 granular spiral cords, without umbilicus, a nacreous white colour.
Description. Shell rather large for the genus (H 21.1 mm, W 20.0 mm), more or less as wide as high, weakly cyrtoconoidal in shape; spire rather elevated, height l.l x width, 3.0 x aperture height, apical angle 70°; subangulate periphery; anomphalous. Protoconch ca. 250 µm wide, 1.25 whorls, rounded, with a very thin, straight terminal varix. Teleoconch up to 7.4 almost flat to weakly convex whorls; early whorls with 3 spiral cords, last whorl with 13 cords.
Suture weakly impressed, not canaliculated. First whorl convex, sculptured by about 20 rather thin prosocline threads and 3 spiral cords, beads produced by intersection of cords with ribs; PI, P2 and P3 appearing almost immediately and simultaneously, PI weaker than the two others; distance between ribs similar in size to width of ribs, distance between spiral cords about 1.5 x size of cords. Second whorl only weakly convex, Pi similar in size, beads of cords stronger, P3 making a suprasutural depression into profile of whorl; P4 almost completely hidden by next whorl; axial threads thicker and transforming into rather thick ribs. Third whorl more or less flat; S2 appearing, much thinner than other cords; beads of PI and P3 blunt sharp, those of PI adapically and P3 horizontally turned. SI appearing at beginning of fourth whorl, thin; axial ribs vanishing; S3 appearing after mid whorl; P4 slightly visible. On fifth whorl, all cords thickening, visible Pi similar in size, Si also similar in size but slightly thinner than Pi. On sixth whorl, TI appearing between P2 and S2, then T2 between PI and SI and T3 between SI and P2. On last whorls, T4 and T5 appearing between S2-P3 and P3-S3; P4 peripheral, thin; S3 splitting into two cords; beads of all spiral cords rounded and blunt sharp; distance between cords larger in adapical part of whorl.
Aperture subelliptical. Columella straight, oblique. Base almost flat, with about 15 granular spiral cords, innermost cords thicker than outermost ones; distance between cords similar to cords; Colour of teleoconch and protoconch nacreous white.

Fautor megateros n. sp. looks superficially similar to F. metivieri (B.A. Marshall, 1995) from southern and northern New Caledonia that has a similar (but not exactly the same) ontogeny of the spiral cords of the teleoconch, but this species is much smaller for the same number of whorls, has a smaller apical angle (62-66° instead of 70°) and a larger H/D ratio.

Type material. Holotype (21.1 x 20.0 mm) MNHN-IM-2000-38736.Type locality. West of New Caledonia, Chesterfield plateau, EBISCO, stn CP2597, 19°44'S, 158°40'E, 496-509 m. Material examined. West of New Caledonia. EBISCO: stn CP2597, 19°44'S, 158°40'E, 496-509 m, 1 dd (holotype MNHN-IM-2000-38736).

Distribution. Only known from the type locality.