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50 million-year-old fossil assassin bug has unusually well-preserved genitalia


50 million-year-old fossil assassin bug has unusually well-preserved genitalia
The fossilized insect is tiny and its genital capsule, called a pygophore, is roughly the length of a grain of rice. It is remarkable, scientists say, because the bug’s physical characteristics – from the bold banding pattern on its legs to the internal features of its genitalia – are clearly visible and well-preserved. Recovered from the Green River Formation in present-day Colorado, the fossil represents a new genus and species of predatory insects known as assassin bugs.
The find is reported in the journal Papers in Palaeontology.
Discovered in 2006 by breaking open a slab of rock, the fossilized bug split almost perfectly from head to abdomen. The fracture also cracked the pygophore in two. A fossil dealer later sold each half to a different collector, and the researchers tracked them down and reunited them for this study. ....

United States , University Of Illinois , Green River , Dan Judd , L Brian Stauffer , Daniel Swanson , Illinois Natural History , Prairie Research Institute , National Science Foundation , University Of Illinois Urbana Champaign , Green River Formation , Sam Heads , Illinois Natural History Survey , Natural History Survey , Rhynie Chert , Cretaceous Period , ஒன்றுபட்டது மாநிலங்களில் , பல்கலைக்கழகம் ஆஃப் இல்லினாய்ஸ் , பச்சை நதி , டான் தீர்ப்பு , ல் பிரையன் ஸ்டாஃபர் , டேனியல் ஸ்வான்சன் , இல்லினாய்ஸ் இயற்கை வரலாறு , ப்ரேரீ ஆராய்ச்சி நிறுவனம் , தேசிய அறிவியல் அடித்தளம் , பல்கலைக்கழகம் ஆஃப் இல்லினாய்ஸ் ஊர்பன சாம்பியன் ,

Migration To America: Canine Genetics Tell The Story


Dogs successfully migrated to the Americas about 10,000 years ago, according to a new study. That s a long time ago but still thousands of years after the first human migrants crossed the land bridge from Siberia to North America. Dogs have been associated with humans in findings from 11,000 to 16,000 years ago. 
Did humans not bring them at first? Did they die?
Ancient dogs split off from wolves likely because they learned to tolerate human company and as part of selective evolution - humans let the ones that protected them and were friendly stick around. Dogs benefited from the association: They gained access to new food sources, enjoyed the safety of human encampments and eventually traveled the world with their two-legged masters. Dogs were also beasts of burden and sometimes food, particularly on special occasions - that meant in times of extreme hunger too. ....

United States , United Kingdom , University Of Illinois , Brian Kemp , Angus Mcnab , Julie Mcmahon , Janeyb Goode , Kelsey Witt , Ripan Malhi , Washington State University , Prairie Research Institute , Illinois State Archaeological Survey , University Of Iowa , Illinois State Archaeological , South America , British Columbia , Andrew Kitchen , ஒன்றுபட்டது மாநிலங்களில் , ஒன்றுபட்டது கிஂக்டம் , பல்கலைக்கழகம் ஆஃப் இல்லினாய்ஸ் , பிரையன் கேம்ப் , அங்குஸ் மக்ந்யாப் , ஜூலி மக்மேயந் , கெல்ஸீ விட் , ரிப்பன் மால்ஹி , வாஷிங்டன் நிலை பல்கலைக்கழகம் ,