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The Conus Biodiversity Website

CATALOGUE OF RECENT AND FOSSIL CONUS

  Conus angasi Tryon, 1883.

Range: New South Wales and Queensland, Australia, possibly restricted to the area between Sydney and Fraser Id.

Description: Moderately small to medium-sized, moderately light to moderately solid; form advertex (Pl. 60, Figs. 19, 20) of smaller maximum size than typical form (Pl. 60, Figs. 16-18). Last whorl conical or ventricosely conical to broadly conical or broadly and ventricosely conical, form advertex often broader than typical form; outline convex at adapical third, straight below. Basal part of columella with a strong dentiform plait at its posterior end. Shoulder angulate, subangulate in large specimens. Spire low and usually with concave outline in form advertex, of low to moderate height and usually with slightly sigmoid outline in typical form. Larval shell of 1.75-2 whorls, maximum diameter 1.1-1.3 mm. Teleoconch sutural ramps almost flat, with 1-2 increasing to 4-8 spiral grooves, with additional spiral striae in latest whorls. Last whorl with rather closely spaced spiral ribs at base.

Shell Morphometry
  L 30-46 mm
     (form advertex 27 - 37 mm)
  RW 0.08-0.20 g/mm (L 27-46 mm)
     (L 27-46 mm)
  RD 0.65-0.71
     (form advertex 0.66 - 0.75)
  PMD 0.77-0.89
     (form advertex 0.81 - 0.90)
  RSH 0.08-0.19
     (form advertex 0.01 - 0.09)

Ground colour white to pale pink. Last whorl with pinkish to light brown spiral bands below shoulder, above centre and within basal third. Spiral rows of brown dots, dashes, spots and bars extending from base to shoulder, usually concentrated and partially fused near and within the spiral colour bands. Larval whorls white. Postnuclear sutural ramps with brown radial streaks usually extending beyond outer margins. Aperture white, tinged with cream and pink deep within.

Habitat and Habits: In 50-250 m. Form advertex is reported from sand bottom and seems to have a more limited bathymetric range (120-200 m).

Discussion: C. angasi is similar to C. baeri and C. wallangra; for comparison, see the Discussions of the latter species. The conchological differences between C. angasi and C. advertex do not justify separation at the species level. Because they occur sympatrically, C. advertex should be provisionally considered a form of C. angasi (see Walls, [1979]; Coomans et al., 1979b; Richard, 1990).

Range Map Image

C. angasi 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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