Tag Archives: Cochliopidae

Tryonia shikueii Hershler, Landye, H.-P. Liu, De la Maza-Benignos, Ornelas & Carson

Shi-Kuei’s Tryonia (Tryonia shikueii)

This species was described in 2014, it is known from two populations inhabiting Ojo de Federico and Ojo de San Juan, two closely proximal springs in the lower Río Casas Grandes basin with water temperatures around 23 °C to 27°C.

The two localities dried out sometimes in the 1980s, which means that both populations of this species are lost leading to its extinction. [1]

*********************

References:

[1] Robert Hershler; J. Jerry Landye; Hsiu-Ping Liu; Mauricio De la Maza-Benignos; Pavel Ornelas; Evan W. Carson: New species and records of Chihuahuan Desert springsnails, with a new combination for Tryonia brunei. Western North American Naturalist 74(1): 47-65. 2014

*********************

edited: 02.05.2019

Tryonia julimesensis Hershler, H. P. Liu & Landye

Julimes Tryonia (Tryonia julimesensis)

The Julimes Tryonia was discovered in 1991 and subsequently described in 2011.

The species was endemic to its type locality, a warm spring complex along the east side of the Río Conchos, where it formerly was very abundantly found in water with a temperature of about 44°C on hard substrate and in detritus which it apparently also fed upon.

The shells eached sizes of about 0,2 cm.

The only known habitat of the Julimes Tryonia was found excavated and draglined in 2001, no individual could be detected and the species is presumed extinct. [1]

*********************

References:

[1] Robert Hershler; Hsiu-Ping Liu; J. Jerry Landeye: New species and records of springsnails (Caenogastropoda: Cochliopidae: Tryonia) from the Chihuahuan Desert (Mexico and United States), an imperiled biodiversity hotspot. Zootaxa 3001: 1-32. 2011

*********************

edited: 02.05.2019

Zetekina panamensis (Bartsch)

Panama Zetekina Snail (Zetekina panamensis)  

The Panama Zetekina Snail was endemic to the Río Matasnillo, which runs through Panama City, the capital of Panama.  

The species is now considered extinct, probably as a result of water pollution. [1]  

*********************  

References:  

[1] Fred G. Thompson: An annotated checklist and bibliography of the land and freshwater snails of México and Central America. Bulletin of the Florida Museum of Natural History 50(1): 1-299. 2011

Tryonia oasiensis Hershler, H. P. Liu & Landye

Oasis Tryonia Snail (Tryonia oasiensis)

The Oasis Tryonia Snail was described in 2011 based on specimens that had been collected earlier.

The species was restricted to a single site, Caroline Spring, a complex of large springs in the lower Pecos River basin in Texas, USA. These springs discharge into two large ponds which were formerly used for recreational purposes, the snail was found along the edges of a short reach of the outflow of one of these ponds, where the temperature was 20°C.

The Oasis Tryonia Snail could not be detected during subsequent visits in 2011 and may in fact be extinct. [1]

*********************

References:

[1] Robert Hershler; Hsiu-Ping Liu; J. Jerry Landeye: New species and records of springsnails (Caenogastropoda: Cochliopidae: Tryonia) from the Chihuahuan Desert (Mexico and United States), an imperiled biodiversity hotspot. Zootaxa 3001: 1-32. 2011

*********************

edited: 02.05.2019

Cochliopa rowelli (Tryon)

Rowell’s Cochliopa Snail (Cochliopa rowelli 

Rowell’s Cochliopa Snail, which was described in 1863, appears to have always been restricted to its type locality, the Río Matasnillo in Panamá City, Panama.  

The species is now considered extinct, possibly caused by the pollution of its habitat. [1]  

*********************  

References:  

[1] Fred G. Thompson: An annotated checklist and bibliography of the land and freshwater snails of México and Central America. Bulletin of the Florida Museum of Natural History 50(1): 1-299. 2011

*********************  

edited: 20.09.2020

Tryonia hertleini (Drake)

Hertlein’s Tryonia (Tryonia hertleini)

Hertlein’s Tryonia was described in 1956.

The shells reached sizes of about 0,25 to 0,32 cm in heigth. 

Hertlein’s Tryonia was restricted to a single locality near the terminus of the Río Casas Grandes drainage in Chihuahua, Mexico, close to the border to New Mexico, USA, which today is completely dry.  

The species is now considered extinct. [1][2]  

*********************

References:

[1] Robert Hershler: Systematics of the North and Central American aquatic snail genus Tryonia (Rissooidea: Hydrobiidae) Smithsonian Contributions to Zoology 612: 1-53. 2001
[2] Robert Hershler; Hsiu-Ping Liu; J. Jerry Landeye: New species and records of springsnails (Caenogastropoda: Cochliopidae: Tryonia) from the Chihuahuan Desert (Mexico and United States), an imperiled biodiversity hotspot. Zootaxa 3001: 1-32. 2011

*********************

edited: 02.05.2019