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Odontaspididae (family of sand sharks)

Pseudocarchariidae (family whose only member is the crocodile shark)

Megachasmidae (family whose sole member is the megamouth shark)

Cetorhinidae (family whose only member is the basking shark)

Lamnidae (family of mackerel sharks)

Alopiidae (family with three species of thresher sharks all within the genus Alopias)

Scyliorhinidae (family of catsharks)

Proscylliidae (family of finback catsharks)

Pseudotriakidae (family with only one species of false catshark, Pseudotriakis microdon)

Triakidae (family of houndsharks)

Carcharhinidae (family of migratory live-bearing requiem sharks)

Hemigaleidae (family of weasel sharks)

Hemigaleidae (family of weasel sharks)

Chlamydoselachidae (family of frilled sharks)

Hexanchidae (family with four species and three genera of cow sharks characterized by either one or two additional pairs of gill slits)

Varanidae (family of carnivorous monitor lizards)

Acanthuridae (family of marine tropical surgeonfishes, tangs, and unicornfishes)

Ephippidae (family of mostly marine spadefishes)

Luvaridae (family containing one extant species of perciform fish similar to a surgeonfish)

Scatophagidae (family of small Indo-Pacific fish commonly called scats)

Zanclidae (family of perciform fish)

planetary science

Veneridae (family of bivalve molluscs comprising the Venus clams)

Buccinidae (family of gastropod mollusc comprising the true whelks)