Mammillaria sinistrohamata 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Caryophyllales Cactaceae

Scientific Name: Mammillaria sinistrohamata Boed.
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: Considered a synonym of M. mercadensis by cactus specialist Anderson (2001) and by the assessors. Provisionally accepted as a species by cactus specialists, Hunt (1999) and Pilbeam (1999). This assessment is based on the populations in the areas identified as M. sinistrohamata by Pilbeam. The assessors find no characteristics in the description that differentiate it from M. mercadensis. The counterclockwise orientation of the hooks on the central spines, that is the basis of the epithet, appears irregularly as it does in other M. mercadensis subpopulations. The yellow spines and flowers appear also in M. mercadensis (Hunt 1987 re M. sinistrohamata).

Assessment Information [top]

Red List Category & Criteria: Data Deficient ver 3.1
Year Published: 2017
Date Assessed: 2009-11-16
Assessor(s): Fitz Maurice, B & Fitz Maurice, W.A.
Reviewer(s): Goettsch, B.K., Schipper, J. & Superina, M.
Facilitator/Compiler(s): Wyatt, S.
Mammillaria sinistrohamata is listed as Data Deficient because it cannot be distinguished from similar species. Therefore, population numbers and range cannot be determined. If it is a distinct species, it would qualify as Critically Endangered because of its small range, single location, and declining population.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is endemic to Mexico, where it occurs in the state of Zacatecas at elevations of about 1,900 m asl.
Countries occurrence:
Mexico (Zacatecas)
Additional data:
Lower elevation limit (metres):1900
Upper elevation limit (metres):1900
Range Map:Click here to open the map viewer and explore range.

Population [top]


The species is abundant within its limited range. It has an estimated population size of no more than 500 individuals. However, it is impossible to distinguish this species from surrounding populations of M. mercadensis.

Current Population Trend:Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This species is found among volcanic rocks in semi-desert.

Use and Trade [top]

Use and Trade: The species is used as an ornamental, individuals are collected from wild populations.

Threats [top]

Major Threat(s): There is some illegal collecting and it is also threatened by land use change for agriculture and cattle ranching.

Conservation Actions [top]

Conservation Actions: The location of the population is not widely known and therefore site conservation efforts would be counterproductive. There is taxonomic disagreement about whether this species is different from M. mercadensis and more taxonomic research is needed to clarify the definition of these species.

Amended [top]

Amended reason: The species distribution map has been added.

Citation: Fitz Maurice, B & Fitz Maurice, W.A. 2017. Mammillaria sinistrohamata (amended version of 2013 assessment). The IUCN Red List of Threatened Species 2017: e.T152295A121530556. . Downloaded on 20 June 2018.
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