''Fusconaia mitchelli'', the false spike, is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

freshwater mussel Freshwater bivalves are one kind of freshwater mollusc, along with freshwater snails. They are bivalves that live in fresh water as opposed to salt water, which is the main habitat type for bivalves. The majority of species of bivalve molluscs ...

, an aquatic

bivalve Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bival ...

mollusc Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is esti ...

in the family

Unionidae The Unionidae are a family of freshwater mussels, the largest in the order Unionida, the bivalve molluscs sometimes known as river mussels, or simply as unionids. The range of distribution for this family is world-wide. It is at its most diverse ...

, the river mussels. This species is native to

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

, where its historical range is in the states of

Coahuila Coahuila (), formally Coahuila de Zaragoza (), officially the Free and Sovereign State of Coahuila de Zaragoza ( es, Estado Libre y Soberano de Coahuila de Zaragoza), is one of the 32 states of Mexico. Coahuila borders the Mexican states of N ...

Nuevo Leon Nuevo is the Spanish word for "new". It may refer to: * Nuevo, California, a town in the state of California * Nuevo (band), featuring singer and musician Peter Godwin * Nuevo (Bayamón), a settlement in Puerto Rico * "Nuevo", Spanish-language vers ...

, and

Tamaulipas Tamaulipas (), officially the Free and Sovereign State of Tamaulipas ( es, Estado Libre y Soberano de Tamaulipas), is a state in the northeast region of Mexico; one of the 31 states which, along with Mexico City, comprise the 32 Federal Entiti ...

, and the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

, where it was found in the states of

New Mexico ) , population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano) , seat = Santa Fe , LargestCity = Albuquerque , LargestMetro = Tiguex , OfficialLang = None , Languages = English, Spanish ( New Mexican), Navajo, Ker ...

and

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

Conservation

This species has experienced an extreme population decline due to habitat deterioration. Until recently, no live individuals had been observed since the late 1970s, leading many researchers to believe it was close to (if not already) extinct. However, interest in this species was revived in 2011 when a fresh-dead shell was discovered. A 2011 a survey of the Guadalupe River near

Gonzales, Texas Gonzales is a city in Gonzales County, Texas, United States. It is the county seat. The population was 7,165 at the 2020 census. The "Come and Take It" flag in the War for Texas Independence from Mexico originated in Gonzales. Its economy is enh ...

revealed a small surviving population, with seven live mature individuals counted.

Taxonomy

In 2016, this species underwent its first genetic study due to its recent rediscovery. The results showed that this species was better placed in ''Fusconaia'' rather than ''Quadrula'', which it was previous included in. Historically, it also was formerly included in the now-obsolete genus ''Quincuncina''. File:Fusconaia mitchelli2.jpg, Live ''Fusconaia mitchelli'' from the Guadalupe River, Gonzales County, Texas, in 2011.

References

Molluscs of the United States Molluscs of Mexico mitchelli Molluscs described in 1895 {{Unionidae-stub