Dejira

Dejira (デジラ) is a small and fast Mechaniloid that appears as an enemy in Mega Man X4 and Mega Man X5.

In Mega Man X4 it appears in the first half of the Bio Laboratory, Split Mushroom's stage. They quickly fly in the player's direction to cause damage, turn around and leave the area. 

Dejira GR
Dejira GR (デジラＧＲ) is an aquatic variety of Dejira. It is launched in sets of three from U-555's mouth in Mega Man X5.