 In contrast, a few species such as "G. atlanticus" and "G. melastomus" exhibit multiple oviparity, in which several eggs can mature within each oviduct simultaneously.Single oviparity is considered to be the basal condition, while multiple oviparity and aplacental viviparity are thought to be more derived.Sawtail catsharks pose no danger to humans and have little economic value, though varying numbers are caught incidentally by deepwater commercial fisheries.