||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).
|Red List Category & Criteria:
||Fitz Maurice, B, Fitz Maurice, W.A.
||Taylor, N. & Stuppy, W.
Qualifies as Least Concern due to its numerous subpopulations
over a relatively large area and a large number of individuals, where some
continuing decline is in evidence.
The number of subpopulations and individuals makes conservation
measures a low priority.
||Species endemic to Mexico, occurring in the states of Durango and Zacatecas at elevations of about 1,900 m.
M. sinistrohamata appear over a 5,000 km2 area.
Mexico (Durango, Zacatecas)
||Click here to open the map viewer and explore range.
Estimated population size of more than 10,000 individuals.
Habitat and Ecology
|Habitat and Ecology:
Among volcanic rocks in semi desert.
There is some illegal collecting by tour groups
and individuals. Increased agricultural use and housing expansion pose a small