Medionidus

Medionidus
	Medionidus conradicus
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Unionida
Family:	Unionidae
Genus:	Medionidus; Simpson, 1900

Last updated April 23, 2019

Medionidus is a genus of freshwater mussels, aquatic bivalve mollusks in the family Unionidae.

A genus is a taxonomic rank used in the biological classification of living and fossil organisms, as well as viruses, in biology. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus.

An aquatic animal is an animal, either vertebrate or invertebrate, which lives in the water for most or all of its lifetime. Many insects such as mosquitoes, mayflies, dragonflies and caddisflies have aquatic larvae, with winged adults. Aquatic animals may breathe air or extract oxygen that dissolved in water through specialised organs called gills, or directly through the skin. Natural environments and the animals that live in them can be categorized as aquatic (water) or terrestrial (land). This designation is paraphyletic.

The Unionidae are a family of freshwater mussels, the largest in the order Unionida, the bivalve mollusks sometimes known as river mussels, or simply as unionids.

Species within the genus Medionidus

Medionidus acutissimus (Alabama moccasinshell)
Medionidus conradicus
Medionidus parvulus (Coosa moccasinshell)
Medionidus penicillatus (gulf moccasinshell)
Medionidus simpsonianus (Ochlockonee moccasinshell)
Medionidus walkeri

Medionidus acutissimus, the Alabama moccasinshell, is a species of freshwater mussel in the family Unionidae, the river mussels. It is native to Alabama, Mississippi, Georgia, Tennessee, and possibly Florida. It is a federally listed threatened species of the United States.

Medionidus conradicus is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

<i>Medionidus parvulus</i> species of mollusc

Medionidus parvulus, the Coosa moccasinshell, is a rare species of freshwater mussel in the family Unionidae, the river mussels. This aquatic bivalve mollusk is native to Georgia and Tennessee in the United States, and has been extirpated from the state of Alabama. It is a federally listed endangered species of the United States.

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Parvulus is a Latin adjective meaning small. It can refer to:

Medionidus penicillatus, the gulf moccasinshell, is a rare species of freshwater mussel in the family Unionidae, the river mussels. This aquatic bivalve mollusk is native to Alabama, Florida, and Georgia in the United States, where it is in decline and has been extirpated from most of the rivers it once inhabited. It is a federally listed endangered species of the United States.

The Ochlockonee moccasinshell is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

Medionidus walkeri is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

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Bryant Walker (1856–1936) was an American malacologist who specialized in the non-marine Mollusca. He mainly studied the freshwater mollusks of the USA, in particular those of Michigan. He published many papers on the Unionida, an order of freshwater mussels.