23331221
[Crustaceans] (gills, two pairs of antennae)
- 0 Hegel's 'System of Science'
- 1 Logic (Thinking of Thinking, Science of Science)
- 2 Nature (science of matter)
- 3 Spirit/Mind (Science of humanities)
- 21 Mechanics
- 22 Physics (including Chemistry)
- 23 Organism / Life (Subjectivity)
- 231 The Earth (Geology)
- 232 Plant life (biology of the vegetal)
- 233 Animal life (biology of the animal)
- 2331 Shaping (metabolism)
- 2332 Appropriation of the outside world (assimilation)
- 2333 Genus process of the animals (reproduction)
- 23331 Special animal species
- 23332 Stimulus and effect (inappropriateness to the genus)
- 23333 Death and birth
- 233311 General type of animal
- 233312 Genus and species (Zoology)
- 233313 Single living being (struggle for existence)
- 2333121 Animals without articulation (no skeleton)
- 2333122 Articulated animals (arthropods: exoskeleton)
- 2333123 Vertebrates and their precursors (deuterostomes, internal skeleton, red blood)
- 23331221 [Crustaceans] (gills, two pairs of antennae)
- 23331222 [Arachnids] (chelicerae, no antennae, eight legs)
- 23331223 [Tracheates] (tracheae, one pair of antennae)
- 233312211 [Small crustaceans] (copepods, ostracods, water fleas)
- 233312212 [Barnacles] (acorn and goose barnacles: sessile)
- 233312213 [Higher crustaceans] (isopods, amphipods, shrimps, lobsters, crabs)