Entomology

All works on insects, butterflies, beetles, spiders, scorpions, etc

General Invertebrates

General Zoology

All works on animals in general: geographically, historically, etc

Herpetology

All works on lizards, snakes, frogs, toads, newts, turtles, etc

Ichthyology

All works on extant and extinct fishes, and on angling & fishing

Invertebrates (others)

All invertebrates other than specifically on molluscs, or insects, spiders and allies

Malacology

All works on shells, snails, slugs, bivalves, cephalopods, etc

Mammalogy

All works on mammals from mammuths to mice, extinct an/or living

Ornithology

All works on birds and birders, including oology, nidology, etc