Shell depressed with low spire, pale brownish-yellow, glossy, translucent. Whorls about 5, rapidly increasing, well rounded, sutures well impressed. Embryonic whorls with fine radial striae, becoming stronger on later whorls; upper surface of last whorl with irregular radial striae which continue onto the sides, overlayed with close, minutely papillose spiral threads. The lower surface is nearly smooth. Umbilicus very small, sealed with hardened slime. Aperture a little wider than high, lunate, with a white lining. Peristome somewhat oblique, sharp, slightly reflected over the umbilicus.
Height 11.8 mm. Diameter 20.3 mm. Spire width 11 mm. Aperture width 10.7 mm. Aperture height 9 mm. Holotype.
Penis rather short, fusiform, without an appendix, of uniform texture throughout its length, interior uniformly papillose, without pilasters. Penial retractor muscle long, slender, attached at the end of the penis. Epiphallus entering the penis near the middle, about 3 times as long as the penis, the lower third much enlarged, being larger than the penis. Spermatheca large, ovoid, duct short. Free oviduct about as long as the penis. Vagina very short, about as long as wide. Atrium very short, only reaching through the integument.
Penis 9 mm. Epiphallus 24 mm. Spermatheca duct 4.3 mm. Vagina 1.5 mm. Free oviduct 9.3 mm. Holotype.
Distribution. — Kentucky: Warren Co.: Barren River bluff, 2 miles northeast of Bowling Green. Tennessee: Montgomery Co.: near Coleman Cave, 5 miles, southwest of Woodlawn. Sumner Co.: hillside, 1.7 miles south of Bransford. Macon Co.: ravine, 4 miles southwest of Lafayette; hillside, above Ann White Cave, 6 miles west of Lafayette, holotype 111660 and paratypes 111661, Chicago Natural History Museum, other paratypes 18296, collection of the author. Smith Co.: Cumberland River bluff, 1 mile southeast of Carthage. DeKalb Co.: Caney Fork River bluff, Sligo Landing, dry hillside, 0.8 mile southeast of Dowelltown. Grundy Co.: Big Mouth Cave Sink, 4 miles northeast of Pelham; side of Cumberland Mtn., 1.5 miles north of Monteagle. Marion Co.: hillside above spring, Martin Springs; hillside above spring, 2 miles south of Martin Springs. Alabama: Madison Co.: Monte Sano State Park, east of Huntsville. Jackson Co.: side of Keel Mtn., Paint Rock.
The shell of Mesomphix anurus differs from that of M. vulgatus in being yellower and more glossy, with more slender, more loosely coiled whorls and deeper sutures. Anatomically it differs in the longer, more slender penial retractor muscle, in the more enlarged basal third of the epiphallus, and in the shorter free oviduct.
Original Description Citation:
Hubricht, L. (1962). Mesomphix vulgatus and its allies. The Nautilus, 76(1): 1-7, plate 1. page(s): 2, pl. 1, fig. C
Nature Serve Conservation Status:
G4: Apparently Secure