What is the origin of the word arachnid?
The Greek word arachne means spider and comes from a myth about a human weaver turned into an eight-legged creature. Adult arachnids possess exactly four pairs of legs attached to the cephalothorax.
Questions about Arachnid
Short answers, pulled from the story.
How do most arachnids breathe outside water?
Internal respiratory surfaces allow most arachnids to survive outside water through tracheae functioning as individual tubes similar to insect systems. Book lungs evolved from modified book gills into vascular lamellae for gas exchange in many species.
When did the Chimerarachne yingi fossil date back to?
This specimen dates back 100 million years from Myanmar and resembles primitive living spiders known as mesotheles. It shows spinnerets and tails within amber from the Devonian times period.
Which arachnid groups have the highest number of described species?
Spiders comprise 51,000 of these described species while mites account for 32,000 species under Acariformes classification. Ticks make up 12,000 species within Parasitiformes groups and harvestmen number approximately 6,700 species globally.