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Photo#321822
Cat-faced Spider - Araneus gemmoides - female

Cat-faced Spider - Araneus gemmoides - Female
Thompson Falls, Sanders County, Montana, USA
August 16, 2009

Images of this individual: tag all
Cat-faced Spider - Araneus gemmoides - female Cat-faced Spider - Araneus gemmoides - female Cat-faced Spider - Araneus gemmoides - female

From Rod Crawford:
This is correctly identified now. Two points make it gemmoides: 1) the
*relative* size of the epigynum. The epigyna of the 2 spp are actually
the same size but gemmoides has a much bigger abdomen so the epigynum
looks tiny by comparison. 2) In gemmoides the scape tends to be
triangular while in gemma it has a parallel-sided portion. This can
get iffy in some specimens but is clearcut in this one.

There is also a habitat difference: gemmoides is commoner in drier
areas, for example just about all specimens from the Columbia Basin
are gemmoides. But there is some overlap.

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