Acritodon nephophilus 


Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Bryophyta Bryopsida Hypnales Hypnaceae

Scientific Name: Acritodon nephophilus
Species Authority: H.Rob.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v) ver 3.1
Year Published: 2012
Date Assessed: 2009-04-27
Assessor(s): Tan, B.C.
Reviewer(s): Bergamini, A. & Gärdenfors, U.
Contributor(s): Delgadillo, C.M.
This species has an extremely restricted range with an extent of occurrence of only 16 km² and an area of occupancy of less than 8 km². The population is known from only two widely separated and isolated locations hence it is considered to be severely fragmented. There is continuing decline in a number of parameters due to a variety of threats operating across the whole range of the species. It is therefore listed as Critically Endangered. Attempts are required to look for this species again as it was last observed in 1966 and could potentially have gone extinct because of all the threats.
Previously published Red List assessments:
2000 Endangered (EN)

Geographic Range [top]

Range Description: Known only from two localities (one collection from each locality): First the type locality:  Southern Mexico, Oaxaca, Sierra Juarez above Valle Nacional, Route 175, cloud forest near km 96. Here it was reported as an epiphyte in cloud forest, on tree branches and trunk of Clethra. Last observed year: 1964.

The second locality is: southern Mexico, Oaxaca, slopes at the pass above Llano de las Flores, on the road between Ixtlán de Juárez and Tuxtepec. Trunk of Clethra, 2,743 m a.s.l. Last observed year: 1966.
Countries occurrence:
Estimated area of occupancy (AOO) - km2: 8
Continuing decline in area of occupancy (AOO): Yes
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 16
Continuing decline in extent of occurrence (EOO): Yes
Extreme fluctuations in extent of occurrence (EOO): No
Number of Locations: 2
Continuing decline in number of locations: Yes
Lower elevation limit (metres): 2700
Upper elevation limit (metres): 3000
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Probably there are less than 100 trees (=phorophytes) which have this species as an epiphyte. Species like Acritodon usually grow in very small patches on the mossy lower part of the tree trunk.
Current Population Trend: Decreasing
Additional data:
Number of mature individuals: 100 Continuing decline of mature individuals: Yes
Extreme fluctuations: No Population severely fragmented: Yes
Extreme fluctuations in subpopulations: No All individuals in one subpopulation: Unknown

Habitat and Ecology [top]

Habitat and Ecology: Grows on the tree bark of Clethra sp. in forested ravines in cloud forest belt (2,700 to 3,000 m.asl).
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes
Generation Length (years): 25
Congregatory: Congregatory (and dispersive)

Threats [top]

Major Threat(s): The whole area where the two localities are located are still continuously disturbed by timber-cutting, road construction and cattle raising. The species was last seen in 1966.

Conservation Actions [top]

Conservation Actions: Protection of the forest at the two known localities is needed. Attempts are required to relocate this species and to survey the population to get more up-tio-date information on its status.

Citation: Tan, B.C. 2012. Acritodon nephophilus. The IUCN Red List of Threatened Species 2012: e.T39187A2890350. . Downloaded on 27 November 2015.
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