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Genus and species (Zoology)

2.3.3.3.1.2. Genus and species (Zoology) © 2003-2026 hegel.net · Kai Froeb 2.3.3.3.1.2. Genus and species (Zoology) 2.3.3.3.1.2.1. Animals without articulation (no skeleton) 2.3.3.3.1.2.2. Articulated animals (arthropods: exoskeleton) 2.3.3.3.1.2.3. Vertebrates and their precursors One level back to Special animal species One level further to Animals without articulation (no skeleton) One level further to Articulated animals (arthropods: exoskeleton) One level further to Vertebrates and their precursors (deuterostomes, internal skeleton, red blood)
2.3.3.3.1.2. Genus and species (Zoology) © 2003-2026 hegel.net · Kai Froeb 2.3.3.3.1.2. Genus and species (Zoology) One level back to Special animal species One level further to Animals without articulation (no skeleton) One level further to Articulated animals (arthropods: exoskeleton) One level further to Vertebrates and their precursors (deuterostomes, internal skeleton, red blood) 2.3.3.3.1.2.1. Animals without articulation (no skeleton) [Primitive animals] 2.3.3.3.1.2.1.1. [Worms] 2.3.3.3.1.2.1.2. [Mollusks] (Mollusks) 2.3.3.3.1.2.1.3. One level back to Animals without articulation (no skeleton) One level further to [Primitive animals] (tissue without organs) One level further to [Worms] (longitudinal axis, gut, bilateral symmetry) One level further to [Mollusks] (Mollusks) 2.3.3.3.1.2.2. Articulated animals (arthropods: exoskeleton) [Crustaceans] 2.3.3.3.1.2.2.1. [Arachnids] 2.3.3.3.1.2.2.2. [Tracheates] 2.3.3.3.1.2.2.3. One level back to Articulated animals (arthropods: exoskeleton) One level further to [Crustaceans] (gills, two pairs of antennae) One level further to [Arachnids] (chelicerae, no antennae, eight legs) One level further to [Tracheates] (tracheae, one pair of antennae) 2.3.3.3.1.2.3. Vertebrates and their precursors Fishes and their precursors (spawn) 2.3.3.3.1.2.3.1. Egg-laying land vertebrates (cloaca) 2.3.3.3.1.2.3.2. Mammals 2.3.3.3.1.2.3.3. One level back to Vertebrates and their precursors (deuterostomes, internal skeleton, red blood) One level further to Fishes and their precursors (spawn) One level further to Egg-laying land vertebrates (cloaca) One level further to Mammals
2.3.3.3.1.2. Genus and species (Zoology) © 2003-2026 hegel.net · Kai Froeb 2.3.3.3.1.2. Genus and species (Zoology) One level back to Special animal species One level further to Animals without articulation (no skeleton) One level further to Articulated animals (arthropods: exoskeleton) One level further to Vertebrates and their precursors (deuterostomes, internal skeleton, red blood) 2.3.3.3.1.2.1. Animals without articulation (no skeleton) One level back to Animals without articulation (no skeleton) One level further to [Primitive animals] (tissue without organs) One level further to [Worms] (longitudinal axis, gut, bilateral symmetry) One level further to [Mollusks] (Mollusks) 2.3.3.3.1.2.1.1. [Primitive animals] [Plate animals] (Placozoa) 2.3.3.3.1.2.1.1.1. [Sponges] 2.3.3.3.1.2.1.1.2. [Cnidarians and comb jellies] 2.3.3.3.1.2.1.1.3. One level back to [Primitive animals] (tissue without organs) One level further to [Plate animals] (Placozoa) One level further to [Sponges] One level further to [Cnidarians and comb jellies] (first tissue, nerve net) 2.3.3.3.1.2.1.2. [Worms] [Flatworms] 2.3.3.3.1.2.1.2.1. [Roundworms] 2.3.3.3.1.2.1.2.2. [Segmented worms] 2.3.3.3.1.2.1.2.3. One level back to [Worms] (longitudinal axis, gut, bilateral symmetry) One level further to [Flatworms] (gut without anus: turbellarians, flukes, tapeworms) One level further to [Roundworms] (continuous gut: nematodes, rotifers) One level further to [Segmented worms] (external segmentation: earthworm, leech, bristle worms) 2.3.3.3.1.2.1.3. [Mollusks] (Mollusks) [Snails] 2.3.3.3.1.2.1.3.1. [Mussels] 2.3.3.3.1.2.1.3.2. [Cephalopods] 2.3.3.3.1.2.1.3.3. One level back to [Mollusks] (Mollusks) One level further to [Snails] One level further to [Mussels] (two shells) One level further to [Cephalopods] (squid, octopus: eye and brain — summit of the unarticulated) 2.3.3.3.1.2.2. Articulated animals (arthropods: exoskeleton) One level back to Articulated animals (arthropods: exoskeleton) One level further to [Crustaceans] (gills, two pairs of antennae) One level further to [Arachnids] (chelicerae, no antennae, eight legs) One level further to [Tracheates] (tracheae, one pair of antennae) 2.3.3.3.1.2.2.1. [Crustaceans] [Small crustaceans] 2.3.3.3.1.2.2.1.1. [Barnacles] 2.3.3.3.1.2.2.1.2. [Higher crustaceans] 2.3.3.3.1.2.2.1.3. One level back to [Crustaceans] (gills, two pairs of antennae) One level further to [Small crustaceans] (copepods, ostracods, water fleas) One level further to [Barnacles] (acorn and goose barnacles: sessile) One level further to [Higher crustaceans] (isopods, amphipods, shrimps, lobsters, crabs) 2.3.3.3.1.2.2.2. [Arachnids] [Mites and ticks] 2.3.3.3.1.2.2.2.1. [Scorpions and harvestmen] 2.3.3.3.1.2.2.2.2. [Spiders] 2.3.3.3.1.2.2.2.3. One level back to [Arachnids] (chelicerae, no antennae, eight legs) One level further to [Mites and ticks] (segmentation dissolved) One level further to [Scorpions and harvestmen] (segmented abdomen) One level further to [Spiders] (spinneret: tool and structure) 2.3.3.3.1.2.2.3. [Tracheates] [Myriapods] 2.3.3.3.1.2.2.3.1. [Primitive insects] 2.3.3.3.1.2.2.3.2. [Winged insects] 2.3.3.3.1.2.2.3.3. One level back to [Tracheates] (tracheae, one pair of antennae) One level further to [Myriapods] (uniformly segmented body) One level further to [Primitive insects] (wingless, without metamorphosis: silverfish, bristletails, springtails) One level further to [Winged insects] (wings as the instrument of freedom) 2.3.3.3.1.2.3. Vertebrates and their precursors One level back to Vertebrates and their precursors (deuterostomes, internal skeleton, red blood) One level further to Fishes and their precursors (spawn) One level further to Egg-laying land vertebrates (cloaca) One level further to Mammals 2.3.3.3.1.2.3.1. Fishes and their precursors (spawn) [Invertebrate deuterostomes] 2.3.3.3.1.2.3.1.1. [Jawless fishes and cartilaginous fishes] 2.3.3.3.1.2.3.1.2. [Bony fishes] 2.3.3.3.1.2.3.1.3. One level back to Fishes and their precursors (spawn) One level further to [Invertebrate deuterostomes] (internal skeleton without a spine) One level further to [Jawless fishes and cartilaginous fishes] (skeleton still cartilaginous) One level further to [Bony fishes] (ossified skeleton) 2.3.3.3.1.2.3.2. Egg-laying land vertebrates (cloaca) Amphibians 2.3.3.3.1.2.3.2.1. Reptiles 2.3.3.3.1.2.3.2.2. Birds 2.3.3.3.1.2.3.2.3. One level back to Egg-laying land vertebrates (cloaca) One level further to Amphibians (bound to water) One level further to Reptiles (creeping animals: shelled egg) One level further to Birds (feather, warm blood, flight) 2.3.3.3.1.2.3.3. Mammals [Monotremes] 2.3.3.3.1.2.3.3.1. [Marsupials] 2.3.3.3.1.2.3.3.2. [Placentals] 2.3.3.3.1.2.3.3.3. One level back to Mammals One level further to [Monotremes] (platypus, echidna) One level further to [Marsupials] (Kangaroo, Koala) One level further to [Placentals] (with placenta)

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