Ichthyocentaurs

They were a tribe of centaurine sea-gods with the upper bodies of men, the lower fore-quarters of horses, and the serpentine tails of fish. Their brows were crowned with a pair of lobster-claw horns.

The two best known were named Bythus (Sea-Depths) and Aphrus (Sea-Foam). They were brothers of the wise centaur Chiron and like him were perhaps regarded as wise teachers.

Parents: Cronus and Philyra
Siblings: Chiron

Aphrodite and the fish-centaurs Aphros and Bythos | Greco-Roman mosaic from Zeugma C1st-2nd A.D. | Gaziantep Museum of Archaeology
Aphrodite and the fish-centaurs Aphrus and Bythus. Graeco-Roman mosaic from Zeugma, 1st-2nd c. AD, Gaziantep Museum of Archaeology.