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Spiders

All articles tagged with #spiders

Canary Island Spider Halves Its Genome, Defying Evolutionary Expectations
science2 months ago

Canary Island Spider Halves Its Genome, Defying Evolutionary Expectations

Researchers comparing Dysdera tilosensis from Gran Canaria with its mainland relative Dysdera catalonica found the island spider has halved its genome (about 1.7 vs 3.3 billion base pairs) yet retains higher genetic diversity, suggesting genome streamlining via purifying selection rather than adaptive expansion and challenging traditional island-evolution patterns.

Ancient Fossil Suggests Spiders Once Had Tails and May Still Do
science3 months ago

Ancient Fossil Suggests Spiders Once Had Tails and May Still Do

Scientists discovered a 100-million-year-old fossil of a spider in Myanmar amber that had a tail, revealing that ancient spider ancestors possessed tails, a trait previously only hypothesized. The fossil, named Chimerarachne yingi, shows a blend of ancient and modern features, including spinnerets and a tail similar to early arachnids, suggesting web-building evolved later. The discovery provides new insights into spider evolution and raises the possibility that similar species might still exist in unexplored rainforests.

Family Survives Five Years with 2,000 Brown Recluse Spiders
science5 months ago

Family Survives Five Years with 2,000 Brown Recluse Spiders

A Kansas family lived with over 2,000 brown recluse spiders for five years without any bites, highlighting that these spiders are less aggressive and less dangerous than commonly believed. The study emphasizes that brown recluse bites are rare, usually minor, and often misdiagnosed, and that proper identification and understanding of their behavior can reduce unnecessary fear and medical concerns.

Fossil Evidence Suggests Spiders' Ancestors Originated in the Ocean
science8 months ago

Fossil Evidence Suggests Spiders' Ancestors Originated in the Ocean

A 500-million-year-old fossil analysis suggests that spiders and their relatives may have originated in the sea before adapting to land, challenging the long-held belief that arachnids have always been terrestrial creatures. The study reveals that the brain organization of the extinct Mollisonia species resembles that of modern spiders, indicating a marine origin for these arachnids.