|Scientific Name:||Mammillaria rettigiana|
|Taxonomic Notes:||Considered a synonym of M. mercadensis by Anderson (2001). Hunt (1999) and Pilbeam (1999) consider it a valid species. The assessors find nothing to differentiate it from the M. jaliscana/M. mercadensis complex (Hunt 1987). This assessment is made using the area defined by Pilbeam and the plants therein meeting the description given by Pilbeam.|
|Red List Category & Criteria:||Endangered B1ab(iii,v) ver 3.1|
|Assessor(s):||Bárcenas Luna, R., Guadalupe Martínez, J. & Sánchez , E.|
|Reviewer(s):||Superina, M., Goettsch, B.K. & Chanson, J.S.|
Mammillaria rettigiana is considered Endangered due to a very limited range (extent of occurrence ca 200 km2), it is found in one location and is declining due to illegal overcollection and destruction of habitat due to urban growth and expansion.
|Range Description:||This species is endemic to Guanajuato, Mexico, where it grows at about 1,700 m asl.|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This species is rare within is limited range.|
|Habitat and Ecology:||This species grows among volcanic rocks (igneous soils) in semi-desert (matorral).|
|Use and Trade:||This cactus is used as an ornamental.|
|Major Threat(s):||This species is found very close to several cities and towns and is declining due to urban development. There is some illegal collecting by tour groups and individuals. Increased agricultural use and housing expansion pose an increasing threat. There is evidence of a substantial decrease in the number of individuals as a result of the 1997 freeze, with some subpopulations being nearly extirpated.|
This cactus is listed on CITES Appendix II, but enforcement of the laws in the countries of destination is needed. The number of subpopulations and individuals makes conservation action a low priority. There is a strong need to research the population status and actual distribution of the species, as well as the implementation of artificial propagation to reduce threats of illegal collection. An additional research priority is to compare specimens with similar species in Querétaro to clarify the taxonomy.
This 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 category “subject to special protection” (Pr; SEMARNAT 2010).
|Citation:||Bárcenas Luna, R., Guadalupe Martínez, J. & Sánchez , E. 2013. Mammillaria rettigiana. The IUCN Red List of Threatened Species. Version 2015.2. <www.iucnredlist.org>. Downloaded on 31 August 2015.|
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