Search results
Results from the WOW.Com Content Network
The outer lip is plicate within, dentate above, the tooth usually bifid. The basal margin is curved and crenulate within. The columella is inserted deep in the rather narrow umbilicus, bearing a strong dentiform fold above and a large quadrangular biplicate tooth at the base. The parietal wall is wrinkled.
Bifid – Having two arms or prongs. [1] Bifurcated – Having two branches. [1] Bilateral – With two sides. [1] Bilobed – With two lobes. [1] Blood sinus; Bulbous – Swollen. [1] Calcareous – Composed of carbonate of lime. [1] Callosity – A hardened and raised bunch, as the callus on the columella of some shells. [1] Callus – A ...
The oblique columella is reflexed, with a bifid tooth at the lower edge. The umbilical cavity is deep, narrow and dentate. The umbilical cavity is deep, narrow and dentate. [ 1 ]
bifid Forked; cut in two for about half its length. Compare trifid. bifoliate (of a compound leaf) Having precisely two leaflet s, usually in a symmetrical pair, e.g. a leaf of Colophospermum mopane. Compare jugate lobed leaf, e.g. most species of Bauhinia. bifusiform Fusiform with a pinch in the middle. bilabiate
The columella spirally ascends the umbilicus, terminating anteriorly in a massive bifid tooth, and higher up supporting a small tubercle. [2] Distribution
These folds can be wide or narrow, prominent or subtle. These features of the columella are often useful in identifying the family, genus, or species of the gastropod. The surface of the columella is called the columellar wall. The columellar callus is a smooth, calcareous thickening, secreted by the mantle, extending over the columellar area ...
It is expanded and deeply sinuated in front, with the outer margin disunited at the suture. The columella is exposed, revealing the inner whorls. The color of the shell is muted, ranging from pale brown to greenish hues. The head-disc is greatly elongated, wide, and bifid anteriorly, tapering towards the rear.
Columella is commonly classified within the Vertiginidae.However, as shown by Nekola & Coles (2016), the genus is not that closely related to the Vertiginidae, but may rather be affiliated with the Chondrinidae or form a pupilloid family of its own.