The shell is small, of a yellowish green-color, minutely wrinkled by the lines of growth. The spire is flat,[1] composed of 2.5-3 whorls,[2] separated by a well-defined suture. The outer whorl has a sharp margin on a level with the spire, diminishing near, but still modifying, the aperture. Below this line the whorl is very convexly rounded so as to encircle a small, deep, abruptly formed umbilicus. This whorl rapidly enlarges, and terminates in a very large, not very oblique aperture, with the lip expanded so as to make it trumpet-shaped.[1]
The width of the shell is 2–3 mm.[2] The height of the shell is 0.9 mm.[2]
This article incorporates public domain text from the reference.[1]
^ abcdefGould A. A. (1841). Report on the Invertebrata of Massachusetts, comprising the Mollusca, Crustacea, Annelida, and Radiata. Published agreeably to an order of the legislature, by the commissioners on the Zoological and Botanical Survey of the state. pp. i-xiii [= 1-13], 1-373, pl. [1-15]. Cambridge. (Forsom, Wells & Thurston). 210-211. figure 140.
^ abcGlöer P. (2002). Die Süßwassergastropoden Nord- und Mitteleuropas. Die Tierwelt Deutschlands, ConchBooks, Hackenheim, 326 pp., ISBN3-925919-60-0, page 190-194.
^(in Czech) Beran L. (1994). "Severoamerický okružák Menetus dilatatus (Gould) v České republice. The found of North American species Menetus dilatatus (Gould) in the Czech Republic (Mollusca: Gastropoda)". Práce muzea v Kolíně, řada přírodovědná 1: 31-32.
Goodchild C. G. & Fried B. (1963). "Experimental Infection of the Planorbid Snail Menetus dilatatus buchanensis (Lea) with Spirorchis sp. (Trematoda)". The Journal of Parasitology49(4): 588-592. JSTOR.
_-_Planorbidae_-_Mollusc_shell.jpeg)
