Fusconaia lananensis 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Bivalvia Unionoida Unionidae

Scientific Name: Fusconaia lananensis (Frierson, 1901)
Common Name(s):
English Triangle Pigtoe
Taxonomic Notes: A list of synonyms for this species can be found on The MUSSEL project web site (Graf and Cummings 2011).

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(i,ii,iii,iv)+2ab(i,ii,iii,iv) ver 3.1
Year Published: 2012
Date Assessed: 2012-03-30
Assessor(s): Cummings, K. & Cordeiro, J.
Reviewer(s): Bohm, M., Seddon, M. & Collen, B.
Contributor(s): Dyer, E., Soulsby, A.-M., Whitton, F., Kasthala, G., McGuinness, S., Milligan, HT, De Silva, R., Herdson, R., Thorley, J., McMillan, K., Collins, A., Offord, S., Duncan, C. & Richman, N.
Fusconaia lananensis has been assessed as Endangered under criteria B1ab(i,ii,iii,iv) + 2ab(i,ii,iii,iv). This is a highly restricted endemic with an estimated extent of occurrence of less than 250 km2 and an area of occupancy of less than 100 km2. It has experienced large-scale, recent declines in population numbers and occupied habitat. However, this species' complete range is not fully known and further research is required with conservation measures necessary to ensure adequate protection of this species.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is endemic to the Neches and San Jacinto Rivers and Village Creek in eastern Texas (Howells et al. 1996). It is apparently extirpated from its type locality in Nacogdoches Co. but is still present in the Lower Angelina drainage in Attoyac Bayou (Howells et al. 1996).
Countries occurrence:
United States (Texas)
Additional data:
Estimated area of occupancy (AOO) - km2:20-100
Number of Locations:2-5
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species is endemic to the Neches and San Jacinto Rivers and Village Creek (Hardin Co.) in eastern Texas (three counties, slightly disjunct) (Howells et al. 1996); apparently it is extirpated from its type locality in Lanana Creek in Nacogdoches Co.

No population estimates exist for this species. See Howells et al. (1997) for numbers of species present in museum collections.

However, populations have declined dramatically in recent years (R. Howells pers. comm. 1996) based on occupied habitat, although occurrences are widespread and extent of the total range is not well known. Long-term trends are not known although the species is rare today (Howells et al. 1996) and Athearn (1970) listed it as rare and/or endangered.
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species was found in Attoyac Bayou in mixed mud, sand, and fine gravel in small rivers (Howells et al. 1996). Direct life-history data is not available for this species. Freshwater mussels are highly variable in their longevity from species to species (e.g. Haag and Rypel 2011). For species from the same genus, studies estimated age at between 15 to 51 years (Haag and Rypel 2011, based on F. cerina, F. cuneolus and F. ebena). However, it has been suggested that growth ring counts may underestimate age by a factor of between three and ten (Anthony et al. 2001).
Congregatory:Congregatory (and dispersive)

Use and Trade [top]

Use and Trade: This species is not utilized.

Threats [top]

Major Threat(s): Sand deposition from environmental disturbances threaten the San Jacinto River populations (R. Howells pers. comm. 1996, NatureServe 2009). Because of the longevity of this species, even though this threat was documented in the 1990s, it may still have an important impact.

Conservation Actions [top]

Conservation Actions: No widespread conservation actions have been undertaken. Williams et al. (2010) lists this species as endangered according to the American Fisheries Society (AFS) assessment. Further research regarding the ecology, populations and threats of this species is required. Conservation measures should be implemented, including site and species protection, enforced via legislation.

Citation: Cummings, K. & Cordeiro, J. 2012. Fusconaia lananensis. The IUCN Red List of Threatened Species 2012: e.T8780A3147017. . Downloaded on 26 April 2018.
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