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Daedalochila subclausa (Pilsbry, 1899) Suwannee Liptooth |
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Polygyra postelliana subclausa Pilsbry, 1899 | Lectotype (?Holotype) ANSP 57082a Bauldingsville, FL; T. Bland! 10.1 mm; 6.4 mm. |
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Euglandina rosea (Férussac, 1821) Rosy Wolfsnail Predation On Daedalochila subclausa |
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This taxon was first described as a subspecies of Polygyra
postelliana (Bland, 1859) by Pilsbry (1899: 141-142). According
to Pilsbry (1948: 605), the species 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 a similar form in Baldwin (colony now
extirpated incidental to roadway "improvement"), but those shells
are referable to D. peninsulae (Pilsbry, 1948: 605) rather
than D. subclausa. 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. Hopes were raised in May, 2009, when Jeff Ward discovered an empty shell* with a close resemblance to ANSP 57082. Spurred by Jeff's discovery, Messrs. Frank and Ward undertook an arduous but unsuccessful search in the same collecting site a few weeks later. Subsequently, 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. *On further review, this specimen was referred to an un-named Daedalochila species, originally encountered in Levy Co., but now known from Dixie, and Baker Cos. |
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