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The Conus Biodiversity Website


  Conus janus Hwass in Bruguière, 1792.

Range: Mambique and Madagascar; probably also Mascarenes, S. India, and Philippines.

Description: Medium-sized to moderately large, moderately solid to solid. Last whorl conical, occasionally ventricosely conical; outline convex adapically, less so to straight below; left side may be slightly concave at base. Shoulder subangulate. Spire of low to moderate height, outline deeply concave. Larval shell of about 3 whorls, maximum diameter about 0.7 mm. Teleoconch sutural ramps flat to slightly concave, with 2 increasing to 4-6 spiral grooves. Last whorl with a few widely spaced, axially striate grooves around basal fourth; ribbons between divided into several fine ribs towards anterior end.

Shell Morphometry
  L 45-75 mm
  RW 0.15-0.47 g/mm
  RD 0.53-0.58
  PMD 0.81-0.89
  RSH 0.11-0.16

Ground colour white. Last whorl with 3 variably broad yellowish to dark brown or orange spiral bands, below shoulder and above and well below centre; bands occasionally with darker brown spiral lines or variably reduced. Straight or wavy, yellowish to dark brown axial streaks of variable width extend from base to shoulder and onto spire; streaks separate or confluent, continuous or interrupted, sometimes absent from spiral colour bands. Base pale yellow. Apex brown; later sutural ramps with brown to blackish brown radial markings. Aperture white or suffused with pale yellow or orange.

Habitat and Habits: In 8-20 m; on sand and fine shell debris with sparse sea-weed, exposed to strong tidal currents (Mozambique: Grosch, pers. comm., 1989).

Discussion: C. janus resembles C. subulatus and C. inscriptus; for comparison see DISCUSSIONS of those species.

Range Map Image

C. janus 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 Rckel, 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 Rckel, 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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