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Cryptazeca monodonta 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Cochlicopidae

Scientific Name: Cryptazeca monodonta de Folin & Bérillon, 1877
Synonym(s):
Azeca monodonta De Folin and Bérillon, 1877
Cryptazeca kobelti Gittenberger, 1983
Taxonomic Source(s): Holyoak, D.T. and Holyoak, G.A. 2012. A review of species-limits in some Cryptazeca (Gastropoda: Azecidae). Iberus 30(1): 91-102.
Taxonomic Notes: For this species we have followed the proposal of Holyoak and Holyoak (2012), who consider Cryptazeca kobelti Gittenberger, 1983 a synonymous with C. monodonta. The former name has been used by some authors to designate populations of C. monodonta living in Spain.

Assessment Information [top]

Red List Category & Criteria: Endangered B2ab(iii) ver 3.1
Year Published: 2017
Date Assessed: 2015-12-02
Assessor(s): Gómez Moliner, B.J.
Reviewer(s): Bank, R. & Martínez-Ortí, A.
Facilitator/Compiler(s): Cálix, M.
Justification:
This species is endemic to the north slope of the western Pyrenees (southwestern France) and the easternmost part of the Cantabrian Mountains (northern Spain). It occurs in leaf-litter in woodlands, in damp habitats. It also lives in very humid places, under thick layers of bryophytes (mosses and hornworts) overlying limestone bedrocks. The species is living in only nine localities in areas with generally less than 1 km2 of suitable habitat. This species is assessed as Endangered since it has a restricted area of occupancy (AOO) (36 km2), the population is severely fragmented and the construction of a road going through its area of distribution in France in the next five years will lead to a decline in the extent of suitable habitat. In addition, an increase in droughts caused by climate change is likely to lead to a continuing decline in the quality of the habitat.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is endemic to the north slope of the western Pyrenees (southwestern France) and the easternmost part of the Cantabrian Mountains (northern Spain). It probably occurs in two separated geographic areas. In the western part of its range, it is distributed  from the Orduña mountains to the common border of the provinces of Bizkaia and Guipuzkoa. In the eastern part of its range, it occurs from the south of Bayonne to "Eaux-Bonnes" (Altonaga et al. 1994, Holyoak and Holyoak 2012). It was also cited in the "Grotte de Lourdes" (Caziot 1916). According to Holyoak and Holyoak (2012), the report of this species from Asturias province (Bech 1986) is not considered because the specimens were probably misidentified.
Countries occurrence:
Native:
France (France (mainland)); Spain (Spain (mainland))
Additional data:
Estimated area of occupancy (AOO) - km2:36Continuing decline in area of occupancy (AOO):No
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:5000
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:10Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:NoLower elevation limit (metres):20
Upper elevation limit (metres):675
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:There are no data about the total population size of this species. Nevertheless, density of living specimens is very low in the localities where it has been found alive. The subpopulations are very small and isolated, and may go extinct with a small probability of recolonisation. The population is therefore considered severely fragmented.
Current Population Trend:Unknown
Additional data:
Continuing decline of mature individuals:No
Extreme fluctuations:NoPopulation severely fragmented:Yes
No. of subpopulations:10Continuing decline in subpopulations:No
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:The species lives amongst leaf-litter in moist deciduous woodlands (Fagus sylvatica, Quercus, Acer, Fraxinus excelsior, Corylus avellana, or other trees and shrubs), overlying limestone bedrock, which are generally - but not always - exposed. It also lives in very humid places, under thick layers of bryophytes (mosses and hornworts) overlying limestone bedrocks.
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes
Movement patterns:Not a Migrant

Use and Trade [top]

Use and Trade: This species is not known to be traded.

Threats [top]

Major Threat(s): The main threat to this species is soil drought due to climate change. Some localities where this species was cited (surroundings of Bayonne, southwestern France) more tan one century ago have been drastically modified by human disturbance (urbanization). Roads crossing some localities affected this species in the past, reducing the extension of suitable habitat, which usually is very restricted. There are plans for the construction of another road going through the distribution area of this species in the next five years. The construction of this road will lead to a decline in the extent of available habitat for this species. Wildfires might be an additional threat for this species.

Conservation Actions [top]

Conservation Actions: This species is protected in France (JORF, 106, 2007, art 3), where destruction or removal of eggs and specimens is forbidden. It is necessary to preserve the extension of suitable habitat. The company responsible for the construction of the new road is supposed to carry out a study assessing the impacts of the road on this species and on Trissexodon constrictus. Captive breeding could be considered if the construction of the road goes ahead. In Orduña (Spain) the species is found in a protected area (SPA). Some localities of the French Pyrenees are also within the Natura 2000 network.
Further research should be conducted in order to improve the current knowledge about the distribution and population trends of this species.

Citation: Gómez Moliner, B.J. 2017. Cryptazeca monodonta. The IUCN Red List of Threatened Species 2017: e.T5709A85564244. . Downloaded on 21 June 2018.
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