Ukrainian stickleback [SEP] parent taxon
Ukrainian stickleback
The Ukrainian stickleback ("Pungitius platygaster") also known as the Caspian ninespine stickleback, southern ninespine stickleback, and Aral ninespine stickleback, is a species of fish in the family Gasterosteidae. It is found in Afghanistan, Bulgaria, Iran, Kazakhstan, Moldova, Romania, Russia, Serbia, Montenegro, and Ukraine (Black Sea, Sea of Azov, Aral Sea and Caspian Sea basins).
A combination of two characters: lack of caudal peduncle keel, presence of large lateral scutes. It is
FAPs and occur in more complex animals are usually essential to the animal's fitness, or in which speed (i.e. an absence of learning) is a factor. For instance, the greylag goose's egg rolling behavior is so essential to the survival of its chicks that the fitness of the parent bird is increased by the behavior being relatively invariant. A stickleback will attack any male fish who enters his territory while the female is sexually receptive, reacting to their red colour, while the female stickleback triggers behavior in the male resulting