One level back to Special animal species 2.3.3.3.1.2. Genus and species (Zoology) One level further to Animals without limbs One level further to Arthropods (exoskeleton) One level further to Vertebrates (red blood, new mouths) Animals without limbs Animals without limbs 2.3.3.3.1.2.1. Animals without limbs One level further to [Protozoa] One level further to [Worms] [Mouth-anus disconnect] One level further to [Mollusks] [Mollusks] One level back to Animals without limbs 2.3.3.3.1.2.1.1. [Protozoa] 2.3.3.3.1.2.1.1.1. [Disk Animals] 2.3.3.3.1.2.1.1.2. [Sponges] 2.3.3.3.1.2.1.1.3. [Coelenterata] One level further to [Disk Animals] (Placozoa) One level further to [Sponges] One level further to [Coelenterata] (Cnidaria, first Eumetazoa) One level back to Animals without limbs 2.3.3.3.1.2.1.2. [Worms] [Mouth-anus disconnect] 2.3.3.3.1.2.1.2.1. [Flatworms] [Tapeworms] 2.3.3.3.1.2.1.2.2. [Roundworms] [Roundworms] 2.3.3.3.1.2.1.2.3. [Ringworm] [Earthworm, Leech] One level further to [Flatworms] [Tapeworms] One level further to [Roundworms] [Roundworms] One level further to [Ringworm] [Earthworm, Leech] One level back to Animals without limbs 2.3.3.3.1.2.1.3. [Mollusks] [Mollusks] 2.3.3.3.1.2.1.3.1. [Snails] 2.3.3.3.1.2.1.3.2. [Mussels] 2.3.3.3.1.2.1.3.3. [Cephalopods] One level further to [Snails] One level further to [Mussels] (two cups) One level further to [Cephalopods] (squid, octopus) Arthropods (exoskeleton) Arthropods (exoskeleton) 2.3.3.3.1.2.2. Arthropods (exoskeleton) One level further to [Crustaceans] [Arthropods] One level further to [Arachnids] [2 limbs, 8 legs] One level further to [Insects] [3 limbs, 6 legs] One level back to Arthropods (exoskeleton) 2.3.3.3.1.2.2.1. [Crustaceans] [Arthropods] 2.3.3.3.1.2.2.1.1. [Small crabs] [Water flea, barnacles] 2.3.3.3.1.2.2.1.2. [Convoluted Crustaceans] [Crabs] [Isosceles] 2.3.3.3.1.2.2.1.3. [Higher crustaceans] [Shrimp, lobster, crab] One level further to [Small crabs] [Water flea, barnacles] One level further to [Convoluted Crustaceans] [Crabs] [Isosceles] One level further to [Higher crustaceans] [Shrimp, lobster, crab] One level back to Arthropods (exoskeleton) 2.3.3.3.1.2.2.2. [Arachnids] [2 limbs, 8 legs] 2.3.3.3.1.2.2.2.1. [Mites, ticks] 2.3.3.3.1.2.2.2.2. [Spider] 2.3.3.3.1.2.2.2.3. [Scorpions] One level further to [Mites, ticks] One level further to [Spider] One level further to [Scorpions] One level back to Arthropods (exoskeleton) 2.3.3.3.1.2.2.3. [Insects] [3 limbs, 6 legs] 2.3.3.3.1.2.2.3.1. [Without Metamorphosis] [Silverfish] 2.3.3.3.1.2.2.3.2. [Incomplete metamorphosis] 2.3.3.3.1.2.2.3.3. [Complete metamorphosis] One level further to [Without Metamorphosis] [Silverfish] One level further to [Incomplete metamorphosis] One level further to [Complete metamorphosis] Vertebrates (red blood, new mouths) Vertebrates (red blood, new mouths) 2.3.3.3.1.2.3. Vertebrates (red blood, new mouths) One level further to Fish (spawning) One level further to Egglayer (cloaca) One level further to Mammals One level back to Vertebrates (red blood, new mouths) 2.3.3.3.1.2.3.1. Fish 2.3.3.3.1.2.3.1.1. [Armored fishes] (extinct) 2.3.3.3.1.2.3.1.2. [Bony Fish] 2.3.3.3.1.2.3.1.3. [Cartilaginous Fish] [Sharks, Rays] One level further to [Armored fishes] (extinct) One level further to [Bony Fish] One level further to [Cartilaginous Fish] [Sharks, Rays] One level back to Vertebrates (red blood, new mouths) 2.3.3.3.1.2.3.2. Egglayer (cloaca) 2.3.3.3.1.2.3.2.1. Amphibians 2.3.3.3.1.2.3.2.2. Reptiles 2.3.3.3.1.2.3.2.3. Birds One level further to Amphibians (frogs, amphibians...) One level further to Reptiles (crawlers) One level further to Birds One level back to Vertebrates (red blood, new mouths) 2.3.3.3.1.2.3.3. Mammals 2.3.3.3.1.2.3.3.1. [Monotreme] 2.3.3.3.1.2.3.3.2. [Marsupials] [Kangaroo, Koala] 2.3.3.3.1.2.3.3.3. [Umbilicals] One level further to [Monotreme] (platypus, echidna) One level further to [Marsupials] [Kangaroo, Koala] One level further to [Umbilicals] (with placenta)

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Genus and species (Zoology)