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The Conus Biodiversity Website

CATALOGUE OF RECENT AND FOSSIL CONUS

  Conus thomae Gmelin, 1791.

Range: Moluccas &d southern parts of Philippines.

Description: Moderately large to large, moderately solid to solid. Last whorl conical, outline almost evenly straight or convex below shoulder. Shoulder angulate. Spire of low to moderate height, outline nearly straight; late whorls often stepped. Larval shell of 2-2.25 whorls, maximum diameter 0.9- 1 mm. About first 5 postnuclear whorls weakly tuberculate. Teleoconch sutural ramps flat to concave, with 2-3 very weak spiral grooves in early whorls. Last whorl with obsolete spiral ribs at base.

Shell Morphometry
  L 55-97 mm
  RW 0.25-0.60 g/mm
     (L 55-85 mm)
  RD 0.49-0.54
  PMD 0.86-0.94
  RSH 0.09-0.15

Ground colour white. Last whorl usually with 3 broad, solid or interrupted brown spiral bands, below shoulder, above centre and within basal third, and with numerous spiral rows of similarly coloured dots, spots and dashes from base to shoulder. Pattern may produce zones with a fine to coarse brown network; brown dashes sometimes alternate with white dots; brown blotches rarely axially instead of spirally arranged. Larval whorls light brown. Early postnuclear sutural ramps brown; late ramps white, with brown radial streaks and blotches that extend across outer margins. Aperture white.

Periostracum yellowish grey, thin, translucent, and smooth.

Habitat and Habits: In 150-250 m.

Discussion: C. thomae can only be confused with C. thalassiarchus; for the distinctions, see the Discussion of the latter species. Although the holotype is lost, C. jousseaumei is generally considered as an exceptional variant of C. thomae. According to the original figure and description, it differs in its undulate later postnuclear whorls and its yellowish orange colour, with closely spaced darker spiral lines and a paler central band on the last whorl.

Range Map Image

C. thomae 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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