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Spider for bugguide - Araneus

Spider for bugguide - Araneus
Haileybury, Web from our garden to our birch tree. Giant Web. , Canada, Ontario, Haileybury, Ontario, Canada
August 18, 2017
Size: Bigger than a quarter.
The Web is 3 feet long. 1 and a half feet wide. Not symmetrical at all. Does not rebuild it every night. Sometimes waits 3 nights or till its Web is completely destroyed. It hangs in the middle of web, facing downward. But also sits off to the side under a branch of the tree and watches and waits.
The most amazing thing about it, the spider has two cone shaped bumps on its back. It's black with stripped legs. And quite large. Never seen one of its kind before.

Images of this individual: tag all
Spider for bugguide - Araneus Spider for bugguide - Araneus

Moved from Spiders.

The ventral is inconsistent with A. gemmoides. This may actually be A. bicentenarius though it's difficult to be certain from what's visible in the dorsal shot.

Moved from ID Request.

Identified as a Cat faced Orb weaver
Cat faced Orb Weaver, species araneus gemmoides. (Shared with araneus gemma). Commonly known as the Jewel Spider(shared with austracantha minax). It is a common outdoor orb weaver in the USA and Canada. Considered harmless, it does have a low toxicity venom. Useful natural predator for insects. Makes webs near lights, closed spaces, sides of buildings...but also found under wood, in overhangs and in guarded places like animal burrows.
Comes in varying colours. Easily identified by 2 horn growths on relatively large abdomen. Changes colour from summer to winter. Female will die after laying a single egg sac. The sac overwinters, then the spiderlings emerge, will eat each other if they do not leave nest. They ride strands of silk on the wind to new locations to start their lives.

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