Mammillaria rettigiana

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

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Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
PLANTAE	TRACHEOPHYTA	MAGNOLIOPSIDA	CARYOPHYLLALES	CACTACEAE

Scientific Name:

Mammillaria rettigiana

Species Authority:

Boed.

Common Name/s:

Spanish

–

Biznaguita

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.

Assessment Information [top]

Red List Category & Criteria:	Vulnerable C2a(i) ver 3.1
Year Published:	2002
Annotations:	Needs updating
Assessor/s:	Fitz Maurice, W.A. & Fitz Maurice, B.
Reviewer/s:	Stuppy, W. & Taylor, N.P. (Cacti & Succulent Plant Red List Authority)
Contributor/s:
Justification: Qualifies for listing despite its numerous subpopulations over a relatively large area and large number of individuals, because continuing decline is evident. There are taxonomic difficulties with this taxon and the assessment has been made using the area defined by Pilbeam (1999) and the plants therein meeting the description given by Pilbeam.

Geographic Range [top]

Range Description:	Subpopulations of M. rettigiana found to the area noted by Pilbeam, occupy a 5,000 km² area with a total population size estimated to be more than 5,000 individuals.
Countries:	Native: Mexico (Guanajuato)
Range Map:	Click here to open the map viewer and explore range.

Population [top]

Population Trend:	Decreasing

Population Trend:

Decreasing

Habitat and Ecology [top]

Habitat and Ecology:	Among volcanic rocks in semi-desert at about 1,900 m altitude.
Systems:	Terrestrial

Threats [top]

Major Threat(s):	There is some illegal collecting by tour groups and individuals. Increased agricultural use and housing expansion pose a small threat. There is evidence of a substantial decrease in the number of individuals as a result of the 1997 freeze with some subpopulations extirpated.

Major Threat(s):

There is some illegal collecting by tour groups and individuals. Increased agricultural use and housing expansion pose a small threat. There is evidence of a substantial decrease in the number of individuals as a result of the 1997 freeze with some subpopulations extirpated.

Conservation Actions [top]

Conservation Actions:	Listed on CITES App. 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.

Conservation Actions:

Listed on CITES App. 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.

Citation:	Fitz Maurice, W.A. & Fitz Maurice, B. 2002. Mammillaria rettigiana. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 19 June 2013.
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