Range: New South Wales, Australia.
Description: Moderately small. moderately light to moderately solid. Last whorl conical to ventricosely conical; outline slightly convex, left side concave near base. Shoulder angulate. Spire usually of moderate height, outline concave to slightly sigmoid. Larval shell of about 2.5 whorls, maximum diameter about 0.9 mm. Teleoconch sutural ramps flat, with 0-1 increasing to 3-4 wide spiral grooves. Last whorl with axially striate spiral grooves from base to centre; intervening ribbons narrower and arranged in pairs toward base. often grading to ribs at anterior end.
| Shell Morphometry | ||
|---|---|---|
| L | 25-33 mm | |
| RW | 0.06-0.16 g/mm | |
| RD | 0.63-0.70 | |
| PMD | 0.79-0.88 | |
| RSH | 0.12-0.22 | |
Ground colour white, suffused with light violet or cream. Last whorl with yellowish to orangish brown clouds and blotches, often arranged in spiral rows or forming a coarse meshwork. Larval whorls white. Postnuclear sutural ramps with radial blotches extending over shoulders and matching last whorl pattern in colour. Aperture light pink to pinkish brown.
Habitat and Habits: In 90-250 m.
Discussion: C. sydneyensis is similar to C. baeri, a larger species (L 30-45 mm) with a broader larval shell (1.2-1.3 mm). The last whorl pattern of C. baeri consists of spiral colour bands and separate spiral rows of spots and bars rather than coalescing blotches and clouds, and its aperture lacks pink or violet shades. C. colmani differs from C. sydneyensis in its larger size (to 52 mm), tuberculate early postnuclear whorls, broader larval shell (1.05-1.15 mm) of fewer whorls (2), and in the larger number of spiral grooves on the late sutural ramps; its last whorl pattern elements are narrower, and its aperture is white.
C. sydneyensis 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.