1) Transitional fossil
Found on
https://www.crosswordclues.com/clue/rhyniognatha
Rhyniognatha hirsti is the world’s oldest known insect. It emerged very early during the Early Devonian Period, around 400 million years ago, when earth’s first terrestrial ecosystems were being formed. ==Evidence== The head part of a specimen, preserved in a fragment of Rhynie Chert, was collected in 1919 by the Reverend W. Cran, who provided...
Found on
http://en.wikipedia.org/wiki/Rhyniognatha
No exact match found.
