Steatoda nobilis

Steatoda nobilis

Thursday is yard work day, when we fill two green bins with oak leaves and offcuts, chipping away at the accumulation that’s been filling the carport. As I shovelled the leaves into the bin, lots of fat false widow spiders crawled out of the mulch, including this seven-legged mama.

Steatoda nobilis is native to Madeira and the Canary Islands from where it is thought to have spread to Europe, and continued to spread to other parts of the world including the United States, Chile and Colombia. It is now regarded as one of the most invasive spider species globally. It is considered moderately medically significant, with most bites causing symptoms comparable to those of a bee or wasp sting.

Dermacentor variabilis

Ticks are parasitic arachnids of the order Ixodida. They live by feeding on the blood of mammals, birds, and sometimes reptiles and amphibians. They’ve been around for a long time; the oldest known tick fossils are from the Cretaceous period, around 100 million years old.

I’d never heard of the American dog tick (or wood tick) till I brought one home on my neck last weekend. They mostly live east of the Rocky Mountains. Dermacentor variabilis is a three-host tick—the larva, nymph and adult all need to ingest blood.

Some ticks attach to their host rapidly, while others wander around searching for thinner skin, such as that in the ears of mammals. Mine was obviously still on the hunt for a good feeding site. Reading up on tularemia and Rocky Mountain spotted fever, I’m glad I removed it before it latched on!