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Species Page - Nematocampa resistaria
Nematocampa resistaria ->species page

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scientific name    Nematocampa resistaria    

common name     Bordered Thorn, Filament Bearer

Deciduous and mixedwood forests and woodlands.

Peak flight activity in Alberta is from late July to early August.

A small, tan geometrid with an intricate pattern of maroon lines, bands and venation. Forewing apex slightly falcate. This species is immediately recognizable; there are no other species like it in Alberta.

life history
The common name Filament Bearer stems from the bizarre caterpillar of this species, which is able to evert two pairs of long tentacle-like structures dorsally on the abdomen (See Ives & Wong 1988, Wagner et al. 2001). The function of these structures is unknown, but perhaps is meant to mimic dead, dried flower parts or plant debris. Pupation occurs within a cocoon among plant foliage, and the egg hibernates (McGuffin 1987).

Not of concern.

diet info
Larvae are generalists on both deciduous and coniferous trees and shrubs. Often occurs on Douglas-fir (Pseudotsuga), hemlock (Tsuga), fir (Abies), spruce (Picea), willow (Salix), white birch (Betula papyrifera), hazelnut (Corylus); also low-growing plants such as strawberry (Fragaria) and carrot (Daucus) (McGuffin 1987).

BC to Nova Scotia, south to FL and CA (McGuffin 1987).

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Related Species Info
Display Hierarchy
References (3)
Specimen Info
There are 74 specimens of this species in the online database
Map Distribution
Adult Seasonal Distributioncreate a collection histogram with specimens
Specimen List (74)
Related Links
Moth Photographers Group


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