Posts Tagged: Pholcidae
Just call it a missed opportunity.
Catmint (genus Nepeta) draws scores of insects, from honey bees to leafcutter bees to European wool carder bees.
It also draws spiders.
We usually see a cellar spider (family Pholcidae) trapping prey in its web. It inflicts a fatal bite and then wraps it for later consumption.
This cellar spider, however, crawled along a catmint stem to wait for prey. A honey bee buzzed down and began nectaring one of the lavender blossoms.
It was not aware of the predator. Just as the spider moved toward it, the bee took off.
Later we saw the cellar spider wrapping prey. A closer look revealed it was not a honey bee, a leafcutter bee or a European wool carder bee.
It was another cellar spider. Sexual cannabalism? Maybe. A very hungry cellar spider inept at catching a bee so it nailed a fellow spider instead? Perhaps.
At any rate, that was "what's for dinner."
A cellar spider eyes a honey bee in the catmint (Nepeta). (Photo by Kathy Keatley Garvey)
All wrapped up--a cellar spider nabs another cellar spider. (Photo by Kathy Keatley Garvey)
The parasitic fly (family Tachinidae) never had a chance.
It went from floral visitor to spider prey to spider dinner when it made a single solitary mistake: it inadvertently fell into a sticky web.
Its life-and-death struggle in our back yard did not escape a trio of cellar spiders (family Pholcidae). They rapidly descended on the squirming fly.
This was the first time I've ever seen cellar spiders hunt together. While one wrapped it in silk for future dining pleasure, another administered a fatal bite. The powerful poison paralyzed it. Then one of the bigger spiders tugged the wrapped prey under the lip of our barbecue table. Out of sight.
Bon appetit! Table for three!
It's not easy identifying "what's for dinner" but Martin Hauser, a senior insect biosystematist with the Plant Pest Diagnostics Branch, California Department of Food and Agriculture, said it's definitely a Tachinid fly. There are hundreds of Tachinidae genera, he says, but this one is very likely a Peleteria.
I'm just glad the catch of the day wasn't a honey bee.
Two cellar spiders work together to capture a Tachinid fly in their web. (Photo by Kathy Keatley Garvey)
While one spider wraps the fly, another bites it in the head, paralyzing it. (Photo by Kathy Keatley Garvey)
Close-up of the fatal bite. (Photo by Kathy Keatley Garvey)