Land Snails of Limestone Communities and Update of Land Snail Distributions in Pennsylvania

Pennsylvania has 120 reported land snail species, but information about their distribution within Pennsylvania has been poor. Prior to this study, six well-surveyed counties were known to have 35 or more species, but 34 (50%) counties reported fewer than 15 species. To improve knowledge about distributions and habitat associations of land snails, Curator Tim Pearce compiled museum records, inventoried land snails through fieldwork at 11 limestone areas in western Pennsylvania (limestone has diverse snail faunas), and documented plant communities, habitat parameters, and soil chemistry at fieldwork sites. He documented 1022 new county records since the 1985 distribution maps. Now only 15 counties report fewer than 15 snail species. Habitat analysis confirms that limestone areas harbor greater diversity of snails. Updated distribution maps of 120 species of Pennsylvania land snails are presented. Click here to see the report (Acrobat PDF, 2.8 Mb)

image from coverCMNH researchers contribute to a new publication from the American Malacological Society

Have you ever wondered about collecting snails with a leaf blower? How about the ins and outs of preserving a giant squid? If questions like these arise from time to time, you want a copy of The Mollusks: A Guide to Their Study, Collection, and Preservation. This book would not exist without major contributors from Carnegie Museum of Natural History Section of Mollusks personnel. Click here to learn more about the book and find out how to order! (Microsoft Word, 26Kb)

Hendersonia occultaSnails on the Radio

A rare snail, Hendersonia occulta (cherrystone drop) was known from only 2 of Pennsylvania's 67 counties before 2005. Fieldwork by Tim Pearce in 2005 increased the number of known counties for this snail from 2 to 5, and noted finding the snail near rare larkspur plants. In this 5-minute radio expedition produced by Cynthia Berger from WPSU-FM in University Park, Pennsylvania, join Dr. Pearce to see if a 10-year old report of the larkspur is the clue to finding Hendersonia occulta in yet another county: http://wpsx.ois.psu.edu/www/wpsu.org/radio/features.php?bookmark_id=355&view=2

Land Snails of Pennsylvania Web Site Now Online

This informative Web site presents species descriptions and images of the land snail species found in Pennsylvania. The site also provides detailed discussions of Land Snail Ecology, as well as a helpful identification key. The site can be accessed at: http://www.carnegiemnh.org/mollusks/palandsnails/

Cryptobia innominata
Cryptobia innominata
(photo: Acta Protozoologica)

Powdermill Nature Reserve: Type Locality for a Flagellate Protozoan

Powdermill Nature Reserve (PNR) is now the type locality for a flagellate protozoan that is a parasite in a land snail. The new species of flagellate, Cryptobia innominata, is microscopic with two whip-like flagellae and occurs in the northern threetooth land snail, Triodopsis tridentata. PNR is the type locality for the new flagellate because the “host” snail was collected from PNR by Curator Tim Pearce during BioForay in June 2002.

Triodopsis tridentata
Triodopsis tridentata
(illustration: Emily Ullo)
The new flagellate was described in the journal Acta Protozoologica (2004, vol. 43, pp. 123-132) by protozoologist Eugene N. Kozloff of Friday Harbor Labs in Washington State. Dr. Kozloff was skeptical about J. Leidy’s 1846 description of a related flagellate as occurring in three different species of snails, because the parasitic flagellate is passed among host individuals when they mate. Since snails mate with their own species, different species of snails could have different species of flagellates. When he examined the flagellates in the PNR snail, his suspicion was confirmed, and he named the new species of flagellate from the PNR snail.

A type locality is where a particular type specimen was found. The type specimens (individuals he examined when he wrote the description of the new species) of the flagellate are deposited in the collection at the Smithsonian. Type localities are important because if someone needs to examine additional specimens, the best place to look is the type locality. For more about this specimen, visit the online article in Acta Protozooligica: http://www.nencki.gov.pl/pdf/ap/ap725.pdf.

 

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Corbicula, an annotated bibliography
By Clement L. Counts, III. 2006. 436 pages.

Identification Guide to Land Snails and Slugs of Western Washington
By Timothy A. Pearce, Casey H. Richart, William P. Leonard, and Paul A. Hohenlohe.
High-quality photographic images facilitate identification of the 78 species of native and introduced Pacific Northwest land snails. This key is intended for use by scientists, amateurs, and conservation workers. We would appreciate knowing your suggestions, corrections, and additions. The guide may be reached at this link: http://www.evergreen.edu/ants/TESCBiota/mollusc/key/webkey.htm

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