Stenotrema barbatum

"The Bristled Slitmouth"

Stenotrema barbatum is defined by a comparison with Stenotrema stenotrenum, described by Clapp.
The upper half of the outer lip is more noticeable than in Stenotrema stenotrenum.The upper lip of Stenotrema barbatum, is more concave and flat, with a pronounced tooth just opposite that of the parietal tooth. In addition, the width of the mouth in Stenotrema barbatum is  double than that of Stenotrema stenotrenum (Pilsbry, 1940). The embryonic whorls also differ between these two species.  They are polished and ribbed in Stenotrema barbatum, while in Stenotrema stenotrenum they are granulated  (Pilsbry, 1940). One of the most noticeable features of Stenotrema barbatum is the widely spaced hairs about 1/2 cm long, which is why it is commonly called the bristled slitmouth (Pilsbry, 1940).

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