Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Cycadopsida Cycadales Zamiaceae

Scientific Name: Ceratozamia zaragozae
Species Authority: Medellín-Leal

Assessment Information [top]

Red List Category & Criteria: Critically Endangered A2acd; B1ab(iii,iv,v)+2ab(iii,iv,v); C1 ver 3.1
Year Published: 2010
Date Assessed: 2009-10-31
Assessor(s): Chemnick, J & Gregory, T.
Reviewer(s): Donaldson, J.S. & Bösenberg, J.D.
Qualifies for Critically Endangered based on extent of decline (95%) over the past 50 years, occurrence in a single location with a small extent of occurrence (45 km²) and area of occupancy (<10 km²) and small population size.
Previously published Red List assessments:
2003 Critically Endangered (CR)
1998 Endangered (E)

Geographic Range [top]

Range Description: This species is endemic to San Luis Potosí state, Mexico. Plants are found SW of Rio Verde, in the Capulin district.
Countries occurrence:
Mexico (San Luis Potosí)
Number of Locations: 1
Lower elevation limit (metres): 1800
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Plants are only known from the type locality, at which there are less than 50 plants.
Current Population Trend: Decreasing
Additional data:
Number of mature individuals: 50
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: Plants grow in the Sierra de la Equiteria, in dry pine-oak forests on volcanic outcrops and in rhyolitic soils.
Systems: Terrestrial
Generation Length (years): 45

Threats [top]

Major Threat(s): Plants have been severely affected by over-collection, to the point of being almost eradicated in certain areas.

Conservation Actions [top]

Conservation Actions: This species is listed on Appendix I of the CITES Appendices.

Classifications [top]

1. Forest -> 1.5. Forest - Subtropical/Tropical Dry
suitability: Suitable  
1. Land/water protection -> 1.1. Site/area protection
4. Education & awareness -> 4.3. Awareness & communications

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
In-Place Species Management
In-Place Education
5. Biological resource use -> 5.2. Gathering terrestrial plants -> 5.2.1. Intentional use (species is the target)
♦ timing: Ongoing    
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology
1. Research -> 1.6. Actions

♦  Pets/display animals, horticulture
 National : ✓  International : ✓ 

Bibliography [top]

Chemnick, J., Gregory, T. and Morales, S. 2007. Email received in response to request for information.

Donaldson, J.S. 2006. Notes.

Donaldson, J.S. (ed.). 2003. Cycads. Status Survey and Conservation Action Plan. IUCN/SSC Cycad Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK.

Hill, K.D. and Stevenson, D.W. 1998-2006. The Cycad Pages. Available at:

IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.3). Available at: (Accessed: 2 September 2010).

Jones, D.L. 1993. Cycads of the World. Reed, New Holland, Frenchs Forest, N.S.W., Australia.

Whitelock, L.M. 2002. The Cycads. Timber Press, Portland, Oregon.

Citation: Chemnick, J & Gregory, T. 2010. Ceratozamia zaragozae. The IUCN Red List of Threatened Species 2010: e.T42103A10645793. . Downloaded on 06 October 2015.
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