Posts Tagged: cellar spider
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 lady beetle, aka ladybug, was at the wrong place at the wrong time.
We don't know how she managed to get tangled in the cellar spider's web or why the cellar spider opted to have her for dinner instead waiting for a tasty honey bee, a nutritious leafcutter bee or a plump bumble bee.
Nevertheless, we came upon this predator-prey attack in our backyard. It was too late to save the ladybug.
Ordinarily, the ladybug's bright red coloration serves as a "warning" to predators. Plus, ladybugs are known to ooze a foul-tasting chemical that tastes so bad that predators leave them alone.
"The bright colors of many coccinellids discourage some potential predators from making a meal of them," according to Wikipedia. "This phenomenon is called aposematism and works because predators learn by experience to associate certain prey phenotypes with a bad taste. A further defense known as 'Reflex bleeding' exists in which an alkaloid toxin is exuded through the joints of the exoskeleton, triggered by mechanical stimulation (such as by predator attack) in both larval and adult beetles, deterring feeding."
So why the cellar spider's unusual menu choice? "The spider's 'taste buds' probably weren't very good," quipped a UC Davis scientist.
Cellar spider traps and wraps a ladybug. (Photo by Kathy Keatley Garvey)
Cellar spider proceeds to eat the ladybug, an insect that scientists agree is "foul-tasting" to predators. (Photo by Kathy Keatley Garvey)