tricingulate

comparative more tricingulate · superlative most tricingulate

1. biologyGirdled or banded in three places; marked with three distinct rings, ridges, or encircling bands.

   The upper whorls are plane, and tricingulate.

   2024 July 1, Wikipedia contributors, “Calliostoma fonki”, in English Wikipedia, Wikimedia Foundation

   2 more examples

   Shell conical, imperforate, thin, pale rose colored, upper whorls plane, tricingulate, the upper cingulus beaded, second and third smooth; last whorl obtusely angled, encircled by 5 cinguli; base a little convex, with 6 cinguli; aperture quadrangular; columella a little oblique, cylindrical, scarcely truncate, but sensibly passing into the base.

   1889, George W. Tryon, Jr., Henry A. Pilsbry, Manual of Conchology: Structural and Systematic with Illustrations of the Species., volume XI, Philadelphia: Conchological Section, Academy of Natural Sciences, page 371

   Primary A increases in strength until about whorl 6 which is strongly tricingulate, but thereafter the rise of the secondary, r, followed by tertiaries, decreases its importance.

   1957, New Zealand Geological Survey Paleontological Bulletin, numbers 26-30, page 36