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The shell of Stenotrema florida, a land snail or terrestrial gastropod.The periostracum of this species has minute hairs, giving the snail a velvety feel A yellowish tan periostracum is visible on the lower two thirds of this juvenile (8 cm) valve of the marine bivalve Spisula solidissima The dark periostracum is flaking off of this dried-out valve of the "ocean quahog", marine bivalve Arctica ...
The clam has also been reported as causing a decline of dissolved oxygen in the water of the same river system with wide-ranging second-order effects. [ 58 ] The primary economic and social impact of the invasion of C. fluminea has been billions of dollars in costs associated with clogged plumbing and, heat exchangers, or other human-created ...
The taxonomic term Bivalvia was first used by Linnaeus in the 10th edition of his Systema Naturae in 1758 to refer to animals having shells composed of two valves. [3] More recently, the class was known as Pelecypoda, meaning "axe-foot" (based on the shape of the foot of the animal when extended).
The hyponome or siphon is the organ used by cephalopods to expel water, a function that produces a locomotive force. The hyponome developed from the foot of the molluscan ancestor. [14] Water enters the mantle cavity around the sides of the funnel, and subsequent contraction of the hyponome expands and then contracts, expelling a jet of water.
[1] [2] These bivalves are similar to the soft-shell clams (Mya arenaria), but usually they are smaller. Moreover, their shells are less elongated. [1] Valves are rounded in the anterior end and truncated in the posterior end, with a large gape allowing the passage of an extensible siphon that can reach four times the length of the shell.
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