Here is a list of mythical creatures beginning with this letter and I am constantly gathering information from each continent and continually updating.
Aigikampoi (Etruscan)
A half-goat, half-fish creature, the aigikampoi was used as a symbol of the Mesopotamian god Enki (or Ea), thought to be a visual metaphor acting as a bridge between his aspects representing the earth and the sea. They are later featured in the iconography and art of the Etruscans and then adapted by the Greeks, associating them with the gods Aphrodite and Pan.
Today, the aigikampoi is most well known as the astrological symbol for Capricorn. In Vedic astrology, Capricorn was associated with the crocodile, but the aigikampoi (sometimes called "sea goat" in this context) has almost completely usurped this idea.