Polygyridae
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 Mesodon thyroidus from W. G. Binney, 1878 [1]
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Polygyridae is a family of gastropods. They make up a significant proportion of the land snail fauna of eastern North America, and are also found in western North America, northern Central America, and are present on some Caribbean islands. The definitive reference to the group is Henry Pilsbry's 1940 monograph. [2]
This snail family is distinguished from other gastropods on the basis of several anatomical features. They have no dart apparatus - a portion of the reproductive system in some snails and slugs which deals with the calcareous "darts" used for reproductive stimulation; the muscles which allow the eyes and pharynx to be retracted unite into a single band; and the jaws are ribbed.[3]
[edit] Genera
Pilsbry[2] uses the generic names Allogona, Ashmunella, Giffordius, Mesodon, Polygyra, Praticolella, Stenotrema, Trilobopsis, Triodopsis, and Vespericola. The remaining names listed here have either been elevated from Pilsbry's subgenera, since 1940, or newly created. The two subfamilies, Polygyrinae and Triodopsinae, are distinguished on the basis of reproductive anatomy. [4] [5] [6]
Subfamily Polygyrinae Pilsbry, 1940:
- Appalachina
- Daedalochila
- Euchemotrema
- Fumonelix
- Giffordius
- Hochbergellus
- Inflectarius
- Linisa
- Lobosculum
- Mesodon
- Millerelix
- Patera
- Polygyra
- Praticolella
- Stenotrema
- Trilobopsis
Subfamily Triodopsinae Pilsbry, 1940:
[edit] References
- ^ Binney, William G. (1878). The Terrestrial Air-Breathing Mollusks of the United States and Adjacent Territories of North America. Vol. 5 (plates). Bull. Mus. Comparative Zool., Harvard. Plate 11.
- ^ a b Pilsbry, Henry A. 1940. Land Mollusca of North America (North of Mexico). Acad. Nat. Sci. Philadelphia, Monograph 3, vol. 1(2): 575-994.
- ^ Pilsbry, Henry A. 1939. Land Mollusca of North America (North of Mexico). Acad. Nat. Sci. Philadelphia, Monograph 3, vol. 1(1): 1.
- ^ Pilsbry, Henry A. 1940. Land Mollusca of North America (North of Mexico). Acad. Nat. Sci. Philadelphia, Monograph 3, vol. 1(2): 576.
- ^ Emberton, K.C. 1991. The genetic, allozymic and conchological evolution of the tribe Mesodontini. Malacologia 33 (1-2): 71-178
- ^ [1] Polygyridae at ITIS (Integrated Taxonomic Information System); accessed 18 Dec. 2007.
[edit] Photos of polygyrids
 Allogona ptychophora |
 Ashmunella levettei angigyra |
 Cryptomastix mullani clappi |
 Daedalochila hippocrepis |
 Euchemotrema fraternum |
 Linisa tamaulipasensis |
 Lobosculum pustula |
 Mesodon clenchi |
 Patera perigraptus |
 Polygyra septemvolva volvoxis |
 Praticolella berlandieriana |
 Stenotrema florida |
 Trilobopsis loricata |
 Triodopsis hopetonensis |
 Vespericola armigera |
 Webbhelix multilineata |
