The first somite has become a prosthomere, and carries a pair of extensile antennae.
Between the long, extensile, worm-like tongue of the anteaters, essential to the peculiar mode of feeding of those animals, and the short, immovable and almost functionless tongue of the porpoise, every intermediate condition is found.
These captacula are of unequal length, highly contractile and extensile, easily thrown off and regenerated.
The mouth is small and tubular, furnished with a long extensile tongue.
The strong claws make a hole in the side of the ant-hill, and the insects are collected on the extensile tongue.