Common Name

"Bayan’s Cone"

Status

Regarded as a valid species.

Type Locality

Bourbon, (Réunion), [dubious]

Distribution

India, Sri Lanka, Red Sea to Somalia; probably in Madagascar

Maximum Reported Size

70 mm

Description

Medium-sized to moderately large, moderately solid. Last whorl conical, outline nearly straight to slightly sigmoid. Shoulder carinate, often outwardly curved. Spire of low to moderate height, outline usually deeply concave. Larval shell of about 2.25-3 whorls, maximum diameter about 0.9 mm. First 5-8 postnuclear whorls tuberculate, usually forming a tall projecting cone above an otherwise nearly flat spire.

Teleoconch sutural ramps slightly concave; first 3 ramps may have 1-3 distinct spiral grooves, later ramps with inconspicuous spiral striae. Last whorl with distinct or weak spiral ribs and ribbons at base.Ground colour white, often variably tinged with violet, occasionally with yellow. Last whorl with light to dark brown axial blotches, flames and streaks and with an overlying continuous or interrupted, brown spiral band on each side of centre; subshoulder area may have traces of an additional interrupted spiral band. Spiral rows of brown dashes may extend from base to shoulder, but vary widely in number and arrangement. Larval whorls brown. Early teleoconch sutural ramps immaculate white, later ramps with brown radial markings that may cross shoulder edge. Aperture white, occasionally shaded with pale violet.

Periostracum brown, thin translucent, smooth.

Shell Morphometry

L	45-65 mm
RW	0.15-0.30 g/mm
RD	0.52-0.56
PMD	0.86-0.98
RSH	0.07-0.17

References

• Revue Mag. Zool. 2 (23): p. 200, pl. 18, fig. 1.