 The spined pygmy shark ("Squaliolus laticaudus") and the pygmy ribbontail catshark ("Eridacnis radcliffei") are known to attain maturity at comparably small sizes; difficulties in assessing the reproductive maturity of sharks precludes stating one of these species as definitively smaller than the others.This species is aplacental viviparous, with the developing fetuses being sustained by a yolk sac until birth.Females bear litters of two or three young, each measuring long.