The higher-level phylogeny of the arthropods continues to be a matter of debate and research. In 2008, researchers at Tufts University uncovered what they believe is the world's oldest known full-body impression of a primitive flying insect, a 300 million-year-old specimen from the Carboniferous period. The oldest definitive insect fossil is the Devonian Rhyniognatha hirsti, from the 396-million-year-old Rhynie chert. It may have superficially resembled a modern-day silverfish insect. This species already possessed dicondylic mandibles (two articulations in the mandible), a feature associated with winged insects, suggesting that wings may already have evolved at this time. Thus, the first insects probably appeared earlier, in the Silurian period.
The higher - level phylogeny of the arthropods continues to be a matter of debate and research . In 2008 , researchers at Tufts University uncovered what they believe is the world 's oldest known full - body impression of a primitive flying insect , a 300 million - year - old specimen from the Carboniferous period . The oldest definitive insect fossil is the Devonian Rhyniognatha hirsti , from the 396-million - year - old Rhynie chert . It may have superficially resembled a modern - day silverfish insect . This species already possessed dicondylic mandibles ( two articulations in the mandible ) , a feature associated with winged insects , suggesting that wings may already have evolved at this time . Thus , the first insects probably appeared earlier , in the Silurian period .
What is the term for a mandible with two articulations?
What is the term for a mandible with two articulations ?
dicondylic
dicondylic