Chimaeras! They're deep-sea carnivores that are also called ghost sharks, although they branched off from true sharks about 400 million years ago. A few species will occasionally venture into shallow water, and get captured for display in aquariums.

https://en.wikipedia.org/wiki/Chimaera

Also, lookit these guys. They're little deep-sea aliens! https://mastodon.social/media/PvTHRV_RP2s2h6_oAUo