Lake Stagnicola

Ladislavella catascopium (Stagnicola catascopium,

General Status Rank: 
Undetermined
Common Name: 
Lake Stagnicola
Scientific Name: 
Ladislavella catascopium (Stagnicola catascopium,
Synonyms: 
incl Stagnicola emarginata
Lymnaea catascopium
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Taxonomy
Group: 
Mollusc (Freshwater Gastropod)
Kingdom: 
Animalia
Phylum: 
Mollusca
Class: 
Gastropoda
Order: 
Basommatophora
Family: 
Lymnaeidae
References: 
B100
Habitat
large and small freshwater lakes and rivers, usually on rocks exposed to waves and currents
References: 
B100
Distribution

Ecozones

Taiga Cordillera, Taiga Plains, Taiga Shield, Boreal Cordillera, Boreal Plains
References: 
B100

Distribution

0.33 Clarke's (1981: 137) range which, extends SE and WNW of Great Slave Lake. The EO of this area is ~351,000 km. sq. as measured by MapSource (clipped at borders).
Score: 
G
References: 
B100

Number of Occurrences

There are 23 records of this species from NT in examined Canadian collection databases; they are all in the CMN collected from 1944-1950 (Lepitzki 2013). All the known records are at least 60 years old., the 3 Illinois Natural History Museum records for Stagnicola emarginata are problematic: Stagnicola emarginata (Say, 1821) 60291 00 August 1921 Canada, Northwest Territories, Mackenzie River, Lake Kakisa, near mouth Beaver River, W of Great Slave about latitude 61, North America, 60.93644 -117.42737 Stagnicola emarginata (Say, 1821) 60304E.J. Whittaker 00 August 1921 Canada, Northwest Territories, Mackenzie River, Lake Kakisa, NW end of lake, North America, 61.01410 -117.94868 Stagnicola emarginata (Say, 1821) 60305E.J. Whittaker 00 August 1921 Canada, Northwest Territories, Mackenzie River, Lake Kakisa, NW end of lake, North America, 61.01410 -117.94868 The above records may have duplicates in CMN possibly identified as other species because Clarke was the curator there, but the lat-longs, dates, and site descriptions do not overlap exactly.So, I agree that Stagnicola emarginata should be ranked as "Reported but doubtful" from NT. You could also contact Jeremy to see his views on the 3 records.
References: 
H311
R275

Area of Occupancy

Score: 
-
Threats

Intrinsic Vulnerability

Score: 
-
General Status Rank
Rank: 
Undetermined
Status Rank Description: 
- All the known records are at least 60 years old.Clarke (1981) does not recognize this species and earlier (Clarke 1973: 345) synonymized it with Stagnicola catascopium, a view not shared by Turgeon et al. (1998) or more recently by Johnson et al. (2013). Others have synonymized S. elodes with S. catascopium and S. emarginata so the whole thing could be considered a mess, or a work in progress! (email D Lepitzki 29/09/2016)
S Rank: 
SU
Decision Process Description: 
Draft ranks from Dwayne A.W. Lepitzki 2015
Last Updated: 
October 17, 2016

References

Ecozones

  • Clarke AH (1981) The Freshwater Molluscs of Canada. National Museums of Canada RWED Library Call #QL407.5.C5 - B100 Return

Habitat

  • Clarke AH (1981) The Freshwater Molluscs of Canada. National Museums of Canada RWED Library Call #QL407.5.C5 - B100 Return

NWT Known Subspecies

Clarke AH (1981) The Freshwater Molluscs of Canada. National Museums of Canada RWED Library Call #QL407.5.C5 - B100 Return

Number of Occurrences

  • Gerry Mackie, Dwayne A.W. Lepitzki, Robert Forsyth (2015) e-copy - H311 Return
  • Lepitzki, D. A. W. (2013) For General Status of Species in Canada, Canadian Wildlife Service, 614 and excel flle e-copy - R275 Return

Range Extent

  • Clarke AH (1981) The Freshwater Molluscs of Canada. National Museums of Canada RWED Library Call #QL407.5.C5 - B100 Return

Taxonomy

  • Clarke AH (1981) The Freshwater Molluscs of Canada. National Museums of Canada RWED Library Call #QL407.5.C5 - B100 Return