Digenean metacercariae, gill, swordtail

Digenean metacercariae, gill, swordtail

Photomicrograph of gill tissue from a swordtail (Xiphophorus hellerii) infested with digenean metacercariae. A metacercaria can be seen in almost every primary gill filament. Unstained wet mount; original magnification, 40×.

Courtesy of Dr. Denise Petty.