Jenynsiidae (subclass Actinopterygii, order Atheriniformes) A small family of freshwater fish, of interest mainly because both males and females have the sex organs directed either to the left or to the right. A ‘left’ male can mate only with a ‘right’ female, and vice versa. There are about three species, none exceeding 12 cm in length, found in southern S. America.
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