Facts and Figures: Venomous Animal Tree

The following tree gives a rough idea of the relationships between animal groups, particularly those which have venomous species. It is not a comprehensive list of groups, as that would be very large. Rather, the major and more well-known groups are shown. Venomous animals (only those which are regarded as dangerously venomous to humans) are shown in red. Following a link will take you to more information on that group.

Animalia
Porifera (sponges)
Cnidaria
Anthozoa (sea anemones)
Cubozoa (box jellyfish, Chiropsalmus, irukandji, jimble, morbakka)
Hydrozoa (hydrozoans, bluebottle)
Scyphozoa (hair jelly, blubber, moon jelly)
Ctenophora (comb jellies)
Bilateria
Annelida (worms)
Polychaeta (bristle worms, fireworms)
Oligochaeta (earthworms)
Hirudinea (leeches)
Mollusca
Polyplacophora (chitons)
Bivalvia (mussels, clams)
Gastropoda (snails, cone snails)
Cephalopoda (cuttlefish, squids, octopi, blue-ringed octopus)
Brachiopoda
Bryozoa
Nemertea
Rotifera
Platyhelminthes (flatworms)
Chaetognatha
Onychophora (velvet worms)
Tardigrada (water bears)
Nematoda (roundworms)
Nematophora
Arthropoda (joint-legged invertebrates)
Insecta
Dermaptera (earwigs)
Siphonaptera (fleas)
Hemiptera (bugs)
Orthoptera (grasshoppers, crickets)
Lepidoptera (butterflies, moths)
Coleoptera (beetles)
Diptera (flies, mosquitoes)
Hymenoptera (ants, bees, wasps)
Crustacea (crabs, lobsters, slaters)
Diplopoda (millipedes)
Chilopoda (centipedes)
Xiphosura (horseshoe crabs)
Pycnogonida (sea spiders)
Arachnida
Opiliones (harvestmen)
Aranaea (spiders)
Mygalomorphae (primitive spiders)
Araneomorphae (advanced spiders)
Scorpiones (scorpions)
Acari (mites, ticks)
Deuterostomia
Echinodermata
Crinoidea (feather stars)
Ophiuroidea (brittle stars)
Asteroidea (starfish)
Holothuroidea (sea cucumbers)
Echinoidea (sea urchins)
Urochordata (sea squirts, cunjevoi)
Vertebrata
Chondrichthyes (sharks, rays)
Osteichthyes (bony fish)
Aves (birds)
Amphibia (frogs, salamanders)
Reptilia (reptiles)
Squamata (lizards, snakes)
Testudinata (turtles, tortoises)
Crocodylia (crocodiles, alligators)
Mammalia (mammals)
Monotremata (platypus, echidnas)
Marsupalia (kangaroos, possums, koala, quolls)
Eutheria (placental mammals)