|Scientific Name:||Turbinicarpus gielsdorfianus (Werderm.) V.John & Ríha|
Echinocactus gielsdorfianus Werderm.
Gymnocatus gielsdorfianus (Werderm.) Backeb.
Pediocactus gielsdorfianus (Werderm.) Halda
|Taxonomic Source(s):||Hunt, D., Taylor, N. and Charles, G. (compilers and editors). 2006. The New Cactus Lexicon. dh Books, Milborne Port, UK.|
|Taxonomic Notes:||Accepted as a valid species by cactus specialists Anderson (2001) and Hunt (1999). Some hobbyists refer to the genus as Gymnocactus.|
|Red List Category & Criteria:||Critically Endangered B1ab(iii,v) ver 3.1|
|Assessor(s):||Fitz Maurice, W.A., Fitz Maurice, B, Sotomayor, M., Gómez-Hinostrosa, C., Smith, M. & Hernández, H.M.|
|Reviewer(s):||Goettsch, B.K. & Superina, M.|
This species is listed as Critically Endangered under Criterion B, because it has an extent of occurrence and area of occupancy of approximately 10 km2, it is known from one location and is in continuing decline due to illegal collection and habitat loss.When it was first assessed, the population of Turbinicarpus gielsdorfianus was thought to be very small (only about 250 plants), surveys after the assessments showed that there were 4,000 mature individuals, and an estimated 80% reduction was calculated, however, it is necessary to estimate more accurately the population size and the rate of decline in order to use other criteria to assess the status of the species.
|Previously published Red List assessments:|
|Range Description:||This species is endemic to the Mexican state of San Luis Potosí. It grows on a slope, in an area of about 10 km², at about 1,500 m asl.|
Native:Mexico (San Luis Potosí)
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This species was rediscovered in 1988 near Ciudad del Maíz, San Luis Potosí, Mexico (Fitz-Maurice 1988). When the species was first assessed in 2002 an estimated population decline of at least 80% in five years was estimated and the population size was about 4,000 mature individuals. More updated information is needed to estimate the species rate of decline and population size.|
|Current Population Trend:||Decreasing|
|Habitat and Ecology:||This species grows in xerophytic shrubland on rocky calcareous slope. It is strongly dependent on edaphic conditions. The habitat is locally classified as matorral rosetófilo (Rzedowski 1965).|
|Continuing decline in area, extent and/or quality of habitat:||Yes|
|Generation Length (years):||5|
|Use and Trade:||This species is grown in cultivation as an ornamental. It is also illegally collected in the wild.|
|Major Threat(s):||This cactus is threatened by illegal collecting in a portion of its range. The only known locality has become widely known to collectors. Habitat loss due to overgrazing by goats is also affecting this cactus.|
This cactus does not occur in any protected area. It is listed on CITES Appendix I, but the laws governing imports in the countries of destination need to be enforced. It has been propagated and made widely available for 60 years, yet the demand for field collected plants remains. The species is legally protected in Mexico by the national list of species at risk of extinction, NOM-059-SEMARNAT-2010, where it is listed under the category “at risk of extinction” (P; SEMARNAT 2010).
The Cadereyta Regional Botanic Gardens has developed a universal technique to reproduce species of the genus Turbinicarpus (including Gymnocactus), with a rate of 5x/4 weeks and 95% soil adaptation success (E. Sánchez pers. comm. 2011).
|Citation:||Fitz Maurice, W.A., Fitz Maurice, B, Sotomayor, M., Gómez-Hinostrosa, C., Smith, M. & Hernández, H.M. 2013. Turbinicarpus gielsdorfianus. The IUCN Red List of Threatened Species 2013: e.T40975A2948525.Downloaded on 20 April 2018.|