Teinostoma carinicallus Pilsbry & McGinty, 1946 is one the most distinctive among the local species of vitrinellas (family Tornidae). Its shell, which rarely reaches 3 mm (0.12 inch) in diameter, is delicate, smooth, with a low spire. The last whorl is flat, but the shell periphery is rounded. A concave callus (the plug-like structure on the shell base) completely closes the shell umbilicus. The most distinctive feature in the shell of this species is the presence of a narrow keel bordering the callus. The shell color is translucent-white. The shell in the illustration was collected by Phyllis Sharp in 2004, at the Lighthouse Beach, on Sanibel.
![](https://static.wixstatic.com/media/f867c2_091fa067a2d941bb845c7c4ee4ae26b4~mv2.jpg/v1/fill/w_141,h_92,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/f867c2_091fa067a2d941bb845c7c4ee4ae26b4~mv2.jpg)
#keeled-basevitrinella #tornidae #vitrinella #sanibel #callus #umbilicus #periphery