Conus marksi

Conus marksi (Olsson, 1964)

The shell is small, solid, stout, with a medium height spire of 10 or more whorls, with a nearly straight conic profile except at the apex, where the nuclear and the first nepionic whorls form a high attenuated tip. The last whorl, as well as the preceding ones, is sharply shouldered, the point of greatest width; just below it, the sides shows a light convex curve above, then slope rapidly to the wide stout anterior end. The subsutural fasciole which forms the surface of the spire whorls exposed between then sutures is slightly concave, marked with the crowded, curved growth lines of the anal sinus and minute spiral striae are visible on some specimens. The surface below the shoulder of the body whorl is generally smooth and glossy, plain, but in some specimens, there may be a few, indistinct, encircling rows of small subobsolete beads. The lower half of the surface is encircled by eight or nine, wide, weakly nodded, spiral bands set between incised lines or narrow grooves, sometimes cross-threaded. The siphonal canal notch is large and deep, and forms a small, foldlike, encircling fasciole.

Length 22,8 mm., diameter 11,6 mm.

Holotype USNM 643933

This is a small stout species bearing some resemblance to C. waltonensis Aldrich of the Shial River Miocene of Florida, but is higher as well as differing in details of sculpture.

Common at Telembi.

Angostura Formation (Late Miocene): Telenbi, Rio Cayapas.