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Gobio fluviatilis is a species of gudgeons, a ray-finned fish in the Cyprinidae family.

Gudgeon

Gobio fluviatilis is a species of gudgeons, a ray-finned fish in the Cyprinidae family.

The Ladyfish (Elops saurus) is a species of ray-finned fish in the Elopidae family.

Ladyfish

The Ladyfish (Elops saurus) is a species of ray-finned fish in the Elopidae family.

"Diagram of the heart, the branchial arches, and the principal veins in the Teleosts. Ventral view. The heart is represented without the sigmoid flexure; that is, with the auricle posterior. a, aorta; au., auricle; br.a., branchial arches of the aorta (1-4, numbering from the front); c, carotid; c.v., cardinal veins (right and left); d.a., dorsal arteries; j, jugular veins; d.c., ductus Cuvieri; s.v., sinus venosus; v, ventricle. Only four arterial arches are shown." -Galloway, 1915

Teleost Heart

"Diagram of the heart, the branchial arches, and the principal veins in the Teleosts. Ventral view.…