Range: Philippines and Marshall Is.

Description: Medium-sized to moderately large, moderately solid to solid. Last whorl conical or ventricosely conical; outline almost straight, left side usually constricted above base. Aperture wider at base than near shoulder. Siphonal canal sometimes deflected to left. Shoulder strongly tuberculate. Spire of moderate height, outline straight to convex. Larval shell multispiral, maximum diameter about 0.8 mm. Postnuclear whorls tuberculate. Teleoconch sutural ramps slightly concave with 3 increasing to 4-7 spiral grooves in late whorls. Last whorl with rather broad, axially striate pronounced spiral grooves and prominent ribs and ribbons between.

Ground colour white. Last whorl with rows of brown spots, bars or dashes on spiral elevations, sometimes fusing into a spiral band on each side of centre. Larval whorls white. Postnuclear sutural ramps with brown radial blotches; outer margins with brown spots between mainly white tubercles. Aperture white.

Periostracum blackish brown, thick, velvety and opaque, on last whorl often restricted to spiral ribbons.

Habitat and Habits: In 150-240 m.

Discussion: C. sulcocastaneus is similar to C. moluccensis and C. sulcatus form samiae. The latter has a concave rather than convex spire outline and a broader last whorl (RD 0.61-0.70), with variably spaced, usually granulose spiral ribs bearing narrower dotted and dashed lines than in C. sulcocastaneus. For comparison with C. moluccensis, see the Discussion of that species.

C. sulcocastaneus 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.