The phantom shiner was a species of fish

Fish

Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...

. It was once endemic to the Rio Grande

Rio Grande

The Rio Grande is a river that flows from southwestern Colorado in the United States to the Gulf of Mexico. Along the way it forms part of the Mexico – United States border. Its length varies as its course changes...

 basin and ranged from central New Mexico

New Mexico

New Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...

 to southernmost Texas

Texas

Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...

 and adjacent Tamaulipas

Tamaulipas

Tamaulipas officially Estado Libre y Soberano de Tamaulipas is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 43 municipalities and its capital city is Ciudad Victoria. The capital city was named after Guadalupe Victoria, the...

. Once found in the warm water reaches of the Rio Grande (though never particularly abundant), no specimens have been collected in this range since 1949, and it is believed to be extinct in this area.

The native range of the phantom shiner was the Rio Grande from Espanola

Española, New Mexico

Española also known as Espanola , is a city primarily in Rio Arriba County, New Mexico, in the United States. A portion of the central and eastern section of the city is in Santa Fe County. Española was founded in 1880 as a railroad village, incorporated as a city in 1925. The city is situated in...

 downstream to Brownsville, Texas

Brownsville, Texas

Brownsville is a city in the southernmost tip of the state of Texas, in the United States. It is located on the northern bank of the Rio Grande, directly north and across the border from Matamoros, Tamaulipas, Mexico. Brownsville is the 16th largest city in the state of Texas with a population of...

. In New Mexico, it was documented only in the reach from Espanola to Socorro

Socorro, New Mexico

Socorro is a city in Socorro County in the U.S. state of New Mexico. It stands in the Rio Grande Valley at an elevation of . The population was 9,051 at the 2010 census...

.

Specimens of the phantom shiner have been collected only irregularly (three times in 1939) in a 60 km reach of the middle Rio Grande between Isleta and Bernardo

Bernardo

Bernardo may refer to:People;First name* Bernardo Bellotto, Venitian urban landscape painter or vedutista* Bernardo Corradi, Italian footballer...

. A single specimen was taken from the Rio Grande in Big Bend National Park

Big Bend National Park

Big Bend National Park is a national park located in the U.S. state of Texas. Big Bend has national significance as the largest protected area of Chihuahuan Desert topography and ecology in the United States, which includes more than 1,200 species of plants, more than 450 species of birds, 56...

 in 1953 representing the only known example of the species in the river between El Paso

El Paso, Texas

El Paso, is a city in and the county seat of El Paso County, Texas, United States, and lies in far West Texas. In the 2010 census, the city had a population of 649,121. It is the sixth largest city in Texas and the 19th largest city in the United States...

 and the mouth of the Pecos River

Pecos River

The headwaters of the Pecos River are located north of Pecos, New Mexico, United States, at an elevation of over 12,000 feet on the western slope of the Sangre de Cristo mountain range in Mora County. The river flows for through the eastern portion of that state and neighboring Texas before it...

. In 1959 Trevino-Robinson reported the phantom shiner as abundant in the lower Rio Grande in Texas, downstream from the Pecos River confluence. The last known specimen was recorded in Mexico in 1975.