@poonam,welcome o discourse
@tara singh
4 to 422 million years ago. The head was almost rectangular, with bean-shaped compound eyes. The limbs were generally long and narrow with a spine on the tip, and the body was ornamented with small, pointed scales. Lengths ranged from 16 cm (6.3 in) for O. kokomoensis to 4 cm (1.6 in) for O. pumilus. Onychopterella was able to swim, and probably able to walk on the seabed with its spines and dig with its head. The best-preserved specimens of O. augusti show similarities to modern scorpions in their alimentary canal, limb musculature and respiratory system. (Full article…)
This book is a book which teaches you not lives which they have shared 1st hand.