Pygmy short-horned lizard COSEWIC assessment and status report: chapter 11

Technical Summary

Phrynosoma douglasii

Pygmy Short-horned Lizard – Iguane pygmée à cornes courtes

Range of Occurrence in Canada:
south Okanagan and Similkameen valleys

Extent and Area Information

Extent of occurrence (EO) (km²)
Unable to calculate as there are no confirmed data points: Unknown or 0 km²
Specify trend in EO:
None
Are there extreme fluctuations in EO?
Unlikely
Area of occupancy (AO) (km²)
Unable to calculate as there are no confirmed data points: Unknown or 0km²
Specify trend in AO:
None
Are there extreme fluctuations in AO?
Unknown
Number of known or inferred current locations:
None confirmed
Specify trend in # :
unknown
Are there extreme fluctuations in number of locations?
No
Specify trend in area, extent or quality of habitat:
Habitat rapidly being converted or degraded by invasive plants and by human activities.

Population Information

Generation time (average age of parents in the population):
5 years
Number of mature individuals:
Unknown, likely zero
Total population trend:
None
% decline over the last/next 10 years or 3 generations.
Unknown
Are there extreme fluctuations in number of mature individuals?
No
Is the total population severely fragmented?
Probably if it exists
Specify trend in number of populations:
Unknown, probably none
Are there extreme fluctuations in number of populations?
No
List populations with number of mature individuals in each: 
unknown; probably none

Threats (actual or imminent threats to populations or habitats)

  • Loss of habitat;
  • Lack of rescue effect

Rescue Effect (immigration from an outside source)

USA:
N5
Washington State:
Vulnerable (S3)
Is immigration known or possible?
Possible but unlikely
Would immigrants be adapted to survive in Canada?
Probably
Is there sufficient habitat for immigrants in Canada?
Yes
Is rescue from outside populations likely?
Unlikely

Quantitative Analysis

May already be extirpated

Current Status

COSEWIC:
Extirpated (1992, 2000, 2007)

Status and Reasons for Designation

Status
Extirpated
Alpha-numeric code: 
Not applicable
Reasons for Designation

There have been no confirmed sightings in the past 100 years, although there have been anecdotal reports during that time.

Applicability of Criteria

Criterion A: (Declining Total Population): Not applicable

Criterion B: (Small Distribution, and Decline or Fluctuation): Not applicable

Criterion C: (Small Total Population Size and Decline): Not applicable

Criterion D: (Very Small Population or Restricted Distribution): Not applicable

Criterion E: (Quantitative Analysis): Not applicable

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