Daedalochila subclausa (Pilsbry, 1899) Suwannee Liptooth
This taxon was first described as a subspecies of Polygyra
postelliana (Bland, 1859) by Pilsbry (1899: 141-142). According
to Pilsbry (1948: 605), the taxon is based on a specimen
collected by Thomas Bland in "FLORIDA: Bauldingsville" (ANSP 57082;
10.1 mm) [see above images and Compendium
of Daedalochila type material], but that place
was never located by Pilsbry, and our searches have likewise been
unrewarded. Pilsbry also recorded a single shell from Imri, Hamilton
Co., FL (E.B. Chope!), and an unspecified number from Baldwin, Duval
Co., FL. We have collected only one empty shell of this
species, a few miles north of Baldwin. (A congener, D. peninsulae
(Pilsbry, 1948: 605) lived in the city limits but is now
extirpated incidental to roadway "improvement.") As with
Bauldingsville, we have been unable to locate Imri in Hamilton Co.
or anywhere else in FL.
Hubricht (1985: 37, 148) recorded D. subclausa from several other north FL counties, but our collections in some of his specific localities have revealed only D. hausmani.
Given the low likelihood of obtaining topotypical material, and the lack of consensus on the conchological identification of D. subclausa, the discovery of a living colony with shells very closely approximating the holotype (see images above) is essential if molecular genetic methods are to be applied to the uncertain taxonomy of this and closely-related congeners. During late November, 2009, Brian Marshall discovered a colony consisting of both empty shells and living specimens in a farming area of northern St. Johns County (see above link).
Hubricht, L., 1985, The distributions of the native land mollusks of the Eastern United States. Fieldiana 24(1359): pp. 1-191 + viii. June 28.
Pilsbry, H.A., 1899. Descriptions of new American land shells. The Nautilus 12(12): 140-142. April.
Pilsbry, H. A., 1948. Land Mollusca of North America north of Mexico vol 2 part 2. Academy of Natural Sciences, Philadelphia. xlvi + 591-1113. March 19.