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The Conus Biodiversity Website


  Conus glaucus Linnaeus, 1758.

Range: Indonesia to Philippines, Papua New Guinea, Solomon Is. and Vanuatu.

Description: Medium-sized to moderately large, moderately solid to moderately heavy. Last whorl ventricosely conical to broadly and ventricosely conical, occasionally slightly pyriform; outline convex adapically, less so toward base; left side my be concave near base. Shoulder subangulate to rounded. Spire low, outline almost straight to concave. Teleoconch sutural ramps slightly convex to slightly concave, with spiral striae. Last whorl with pronounced spiral ribs of varying width at base.

Shell Morphometry
  L 35-65 mm
  RW 0.25-1.10 g/mm
     (L 35-65 mm)
  RD 0.67-0.76
  PMD 0.72-0.84
  RSH 0.04-0.09

Ground colour bluish grey. Last whorl with spiral rows of fine brown dots and dashes and intermittent, often obsolete white dashes. Base, siphonal fasciole and basal part of columella immaculate, sometimes brown. Early teleoconch sutural ramps brown; later ramps with blackish brown to black radial streaks or blotches, sometimes extending on last whorl, where they are lighter and form axial streaks. Aperture pale brown in subadults, bluish white in adults.

Dorsum of foot grey, anteriorly edged with orange, suffused with brown on its posterior half, and with a white spot beneath the tiny operculum. Sole of foot beige, with dark spots. Rostrum dull orange. Tentacles beige. Siphon brown (Pl. 75, Fig. 25) (Chaberman, pers. comm., 1981).

Habitat and Habits: Intertidal and shallow subtidal; mainly on sand.

Discussion: C. glaucus differs from C. betulinus and C. suratensis in its smaller size and its distinctive grey rather than yellow or white ground colour. C. suratensis can also be separated by its generally narrower last whorl with spiral ribbons instead of ribs at base. Where both species co-occur, C. betulinus has a coarser pattern. C. glaucus closely resembles some C. loroisii from the Indian Ocean in colour pattern. The latter species is larger (50-120 mm), its ground colour is brownish grey rather than bluish grey, the radial blotches on its sutural ramps are lighter and confluent rather than separate, and the spiral lines on its last whorl consist of longer, more closely spaced markings.

Range Map Image

C. glaucus range map

This section contains verbatim reproductions of the accounts of 316 species of Conus from the Indo-Pacific region, from Manual of the Living Conidae, by Röckel, Korn and Kohn (1995). They are reproduced with the kind permission of the present publisher, Conchbooks.

All plates and figures referred to in the text are also in Röckel, Korn & Kohn, 1995. Manual of the Living Conidae Vol. 1: Indo-Pacific Region.

The range maps have been modified so that each species account has it own map, rather than one map that showed the ranges of several species in the original work. This was necessary because each species account is on a separate page on the website and not confined to the order of accounts in the book.


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