Malacology
Malacology is the study of mollusks. This includes animals like octopus, snails, slugs, and clams. It is the second largest phylum of animals, making them one of the most successful groups on the planet. There are over 80,000 described species of mollusks with many more left to be discovered. Mullusca is composed of 8 recognized classes including Cephalopoda, Gastropoda, Polyplacophora, Scaphapoda, Monoplacophorans, the Aplacophorans, Caudofoveata and Solenogastres, and Bivalvia.
Rivercliff Three-Tooth
(Pilsbry, 1904)
Triodopsis discoidea
Class:
Order:
Family:
Gastropoda
Stylommatophora
Polygyridae
ANSP 11076 [lectotype]
Ecological Information
Native/Inavsive:
Native
Nature Serve Conservation Status:
G3: Vulnerable
Median Size:
10
Height:
Width:
19.5
Taper:
0.7
Taxonomic Information
Polygyra tridentata discoidea
Original Combination:
discoidea = discoid
Etymology
Original Description:
The shell is larger than tridentata, more depressed, the spire usually nearly flat. Whorls 5 1/2 closely and sharply striate. Umbilicus more widely expanding at its opening, showing more of the preceding whorl. The aperture is more or less "dished," the pariental tooth directed towards the upper lip-tooth, which while varying somewhat in shape has a tendancy to be rather wide and flat-topped. The lower lip-tooth is more acute, both being strictly marginal.
Alt. 9 1/2. diam. 20 1/2 mm.
Alt. 8, diam. 19mm.
Alt. 8 1/2, diam. 18 1/2 mm.
Original Description Citation:
Pilsbry, H. A. (1904). A new subspecies of Polygyra tridentata. The Nautilus. 17(12): 142-143.
Citations
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