नीचे जन्तुजगत के सभी संघों (phylum) के अन्तर्गत आने वाले सभी वर्गों (classes) की सूची दी गयी है। यहाँ जन्तुओं के ३३ सघों के अन्तर्गत १०७ वर्गों दिए गए हैं। किन्तु यह ध्यान रखना चाहिए कि यही एकमात्र सूची नहीं है, विभिन्न स्रोत भिन्न संघों और भिन्न वर्गों की सूची देते हैं।

अज्ञात संघ (Incertae sedis)
Micrognathozoa

Acanthocephala (thorny-headed worms)
Archiacanthocephala
Eoacanthocephala
Palaeacanthocephala (ancient thornheads)

Acoelomorpha (simple soft-bodied flatworms)
Acoela
Nemertodermatida

Annelida (segmented worms)

Aelosomata
Clitellata (earthworms)
Myzostomida
Polychaeta (bristle worms)
Echiura (spoon worms)
Sipuncula (peanut worms)

Arthropoda (arthropods: insects, crustaceans, arachnids, centipedes, and millipedes)

Chelicerata
Arachnida (spiders, scorpions, and kin)
Xiphosura (horseshoe crabs; only 4 extant species)
Pycnogonida (sea spiders)

Crustacea
Branchiopoda (fairy shrimp, tadpole shrimp, water fleas, and clam shrimp)
Cephalocarida (horseshoe shrimp; only 12 described species)
Malacostraca (crabs, lobsters, crayfish, krill, various shrimp, woodlice, and kin)f
Maxillopoda (barnacles, copepods, fish lice, and other groups)
Ostracoda (seed shrimp)
Remipedia

Hexapoda
Entognatha (coneheads, two-pronged bristletails and springtails)
Insecta (insects)

Myriapoda
Chilopoda (centipedes)
Diplopoda (millipedes)
Pauropoda
Symphyla (pseudocentipedes)

Brachiopoda ("lamp shells")
Craniforma
Rhynchonellata

Bryozoa (moss animals)
Gymnolaemata
Phylactolaemata
Stenolaemata

Chaetognatha (arrow worms)
Archisagittoidea
Sagittoidea

रज्जुकी संघ

Cephalochordata
Leptocardii (lancelet)

Tunicata
Appendicularia (larvaceans)
Ascidiacea (sea squirts)
Sorberacea
Thaliacea (salps, pyrosomes, and doliolids)

Vertebrata

Agnatha

Cyclostomata
Myxini (hagfish)
Petromyzontida (lampraey)

Gnathostomata

Chondrichthyes (cartilaginous fish, mostly sharks and rays)

Tetrapoda
 Amphibia (amphibians)
 Amniota
 Mammalia (mammals)
 Aves (birds)
 Reptilia (reptiles)

Osteichthyes
Actinopterygii (ray-finned fish, which includes most familiar bony fish)
Sarcopterygii (lobe-finned fish)

Cnidaria (marine stinging animals)
Anthozoa (anemones and corals)
Cubozoa (box jellyfish)
Hydrozoa (hydroids)
Malacosporea (marine parasites)
Myxosporea (marine parasites)
Scyphozoa (true jellyfish)
Staurozoa (stalked jellyfish)
Polypodiozoa (marine parasites)

साइक्लिओफोरा (Cycliophora ; छोटे सागरीय जन्तु
Eucycliophora

Dicyemida (rhombozoa)
Dicyemida

Echinodermata (starfish, sea urchins, sand dollars, sea lilies, and others)

Crinozoa
Crinoidea (sea lilies and feather stars)

Asterozoa
Asteroidea (star fish)
Ophiuroidea (brittle stars)

Echinozoa
Echinoidea  (sea urchins)
Holothuroidea (sea cucumbers)

Entoprocta
Entoprocta

Gastrotricha (hairybacks)
Gastrotricha

Gnathostomulida (jaw worms)
Gnathostomulida

Hemichordata 
Enteropneusta (acorn worms)
Pterobranchia

Kinorhyncha (mud dragons)
Kinorhyncha

Loricifera
Loricifera

मोलस्का 
Bivalvia (clams, mussels, scallops, and kin)
Caudofoveata
Cephalopoda (octopuses, squids and cuttlefish)
Gastropoda (snails and slugs)
Monoplacophora
Polyplacophora (chitons, or sea cradles)
Scaphopoda (tusk shells)
Solenogastres

नेमाटोडा (गोलकृमि)
Adenophorea
Chromadorea
Secernentea

Nematomorpha (horsehair worms)
Gordioidea
Nectonematoida

Nemertea (ribbon worms)
Anopla
Enopla

Onychophora (velvet worms)
Udeonychophora

Orthonectida
Orthonectida

Placozoa
Trichoplacoidea

Platyhelminthes (flatworms)
Cestoda (tapeworms and relatives)
Monogenea
Trematoda (flukes)
Turbellaria (e.g. Dugesia)

Porifera (sponges)
Calcarea (calcareous sponges)
Demospongiae
Hexactinellida (glass sponges)
Homoscleromorpha

Priapulida (priapulid worms)
Halicryptomorpha
Priapulimorpha
Seticoronaria

Rotifera (rotifers)
Bdelloidea
Monogononta
Seisonidea

Tardigrada (tardigrades, water bears, or moss piglets)
Eutardigrada
Heterotardigrada

Xenoturbellida
Xenoturbellida

सन्दर्भ

वर्गिकी सूची