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Description |
Geographic Range [top]
Range Description: The species is known from India (West Bengal; Kolkata, North and South 24 Parganas, Maharashtra Province (requires confirmation), Hugli River (Konnagar, Dakineshwar)), Viet Nam (Tonkin), Bangladesh (WWF 2011), Myanmar (Pegu), and Sri Lanka (University of Florida Malacology database). There is an unconfirmed record from the Philippines (Abbott 1958).
Countries occurrence:
Native:
Bangladesh; India (Maharashtra, West Bengal); Myanmar (Myanmar (mainland))
Continuing decline in area of occupancy (AOO): Unknown
Extreme fluctuations in area of occupancy (AOO): Unknown
Estimated extent of occurrence (EOO) - km2:
Continuing decline in extent of occurrence (EOO): Unknown
Extreme fluctuations in extent of occurrence (EOO): Unknown
Continuing decline in number of locations: Unknown
Extreme fluctuations in the number of locations: Unknown
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population: Spawn densities of Assiminea spp. were observed more than 1000 m-2 (A. Dey pers. comm. 2010) from August to December in India. The maximum population density recorded in the Hugli-Matla estuary was 230 m-2 on average (Subba Rao et al. 1995).
Current Population Trend: Stable
Additional data:
?Continuing decline of mature individuals: Unknown
?Extreme fluctuations: Unknown ?Population severely fragmented: No
?Continuing decline in subpopulations: Unknown
?Extreme fluctuations in subpopulations: Unknown ?All individuals in one subpopulation: Unknown
Habitat and Ecology [top]
Habitat and Ecology: It is the only species of Assiminea that is found in fresh water, within areas of tidal influence. It is a detritus feeder that occurs in ponds and canals linked to the Hugli River, and extends as far north as Bandel (India). This species either crawls on the mud or remains attached to bricks, stones, wood, grass etc. on the bank (Ramakrishna and Dey 2007).
Systems: Freshwater
Continuing decline in area, extent and/or quality of habitat: Unknown
Use and Trade [top]
Use and Trade:
No use or trade information available for this species.
Threats [top]
Major Threat(s):
The threats to this species are not known. Further information on the impact of domestic and industrial pollutants and sedimentation is needed.
Conservation Actions [top]
Conservation Actions:
Studies of the species distribution, life history, threats and population trends are required.
Citation: Madhyastha, A. & Daniel, B.A. 2012. Assiminea francesiae. The IUCN Red List of Threatened Species 2012: e.T166800A1142494. http://dx.doi.org/10.2305/IUCN.UK.2012-1.RLTS.T166800A1142494.en. Downloaded on 25 January 2016.
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