Trigonoscuta rossi


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Trigonoscuta rossi
Species Authority: Pierce, 1975
Common Name(s):
English Fort Ross Weevil

Assessment Information [top]

Red List Category & Criteria: Extinct ver 3.1
Year Published: 2014
Date Assessed: 2014-01-10
Assessor(s): Lyal, C.
Reviewer(s): Gerlach, J.
This species is known only from one very small area. It has not been located since 1975 and is assessed as Extinct. The cause of extinction is not known.
1996 Extinct

Geographic Range [top]

Range Description:

This species was known only from the area around Fort Ross, California.

Regionally extinct:
United States (California)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: No data are available on the population. It was last recorded in 1975.

Habitat and Ecology [top]

Habitat and Ecology: It was found in coastal sand dune habitats.
Systems: Terrestrial

Threats [top]

Major Threat(s): The species was known from only one small area but has not been recorded since 1975 and is suspected to be extinct. In the Fort Ross area, the sand dunes are likely to be degraded by rising sea levels.

Conservation Actions [top]

Conservation Actions: The only recorded site for the species is in the Fort Ross State Historic Park, but the species is assumed to be extinct.

Citation: Lyal, C. 2014. Trigonoscuta rossi. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 29 August 2015.
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