Scientists have identified many spiders from this lineage in the same amber deposit from the Cretaceous period.Their numbers suggest that even 100 million years ago, chimerachne was already a “living fossil” — a species that resembles creatures otherwise known only from the fossil record, Selden said.Heterosexual men are more likely to play the field, and heterosexual women must compete for men’s attention.Of course, tales of scarce men and sexual permissiveness in ancient Sparta won’t convince everyone, so I began to explore the demographics of modern religion.I wanted to show that god-fearing folks steeped in old-fashioned values are just as susceptible to the effects of shifting sex ratios as cosmopolitan, hookup-happy 20-somethings who frequent Upper East Side wine bars. One of my web searches turned up a study from Trinity College’s American Religious Identification Survey (ARIS) on the demographics of Mormons.
The males also have modified pedipalps — syringe-like appendages on the fronts of their faces that modern spiders use during mating.(Ready to learn more than you ever wanted to know about spider sex?
Paul Selden, a paleontologist at the University of Kansas who unveiled that other ancient arachnid and worked with Wang to analyze this latest discovery, said he’d been waiting to find something like this ever since A.
fimbriunguis was discovered.“It seems to be an intermediate form,” Selden said — midway between the spinneret-less A. Due to this mix of features, the two research groups differ slightly over where C. But they agree it is a close cousin of the Araneae, or true spider, order.
Like today’s horseshoe crabs and ginkgo trees, it was a holdover from an earlier period in evolutionary history.
Selden even entertained what he called the “tantalizing possibility these creatures are still around.”C.