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.
Compound Coil
(Say, 1821)
Helicodiscus parallelus
Class:
Order:
Family:
Gastropoda
Stylommatophora
Helicodiscidae
Ecological Information
Native/Inavsive:
Native
Nature Serve Conservation Status:
G5: Secure
Median Size:
1.5
Height:
Width:
3.4
Taper:
1
Taxonomic Information
Planorbis paralellus
Original Combination:
Etymology
Original Description:
Shell dextral, with very minute transverse wrinkles, and regular, revolving, equidistant, parallel, slightly elevated lines ; spire a little convex; volutions four: aperture longer than wide; umbilicus exhibiting all the volutions. Breadth, less than 3-20 of an inch. Inhabits Upper Missouri. This shell has evidently the habit of a Helix, and may probably belong more properly to that genus. but having found it only in a dried up pond, in company with a vast number of aquatic shells, I refer it for the present to this genus.
Original Description Citation:
Say, T. (1821). Description of univalve shells of the United States. Journal of the Academy of Natural Sciences of Philadelphia. 2(1): 149-179.
Citations
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