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Species Page - Synaxis jubararia
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scientific name    Synaxis jubararia    

common name     October Thorn

Deciduous and mixedwood forests and woodlands.

Adults fly throughout September

The October Thorn is one a several rather large geometrids that fly in the fall and have autumn-leaf colours of ochres and rust-brown. The discal spots are small and black but distinct; wings with a pointed protrusion at mid-margin. Similar to the extremely variable Prochoerodes transversata, but the PM line joins the wing margin in a straight line, while in transversata it angles sharply near the apex toward the thorax. S. pallulata, which occurs in the Crowsnest Pass region, is very similar, but has heavier crosslines and darker mottling. No structural differences between jubararia and pallulata are known.

life history
The marbled grey-brown larvae have a large dorsal hump on the thorax, and resemble twigs (Ives & Wong 1988). The egg likely overwinters, and adults are nocturnal and come to light.

Not of concern.

diet info
Larvae feed on deciduous shrubs, particularly willows (Salix) and alder (Alnus), also on birch (Betula), poplars (Populus) and dogwood (Cornus (McGuffin 1987).

Essentially a western species, but occurring east to central Saskatchewan, south to CA (McGuffin 1987).

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Related Species Info
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References (2)
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
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