Biology — Dichotomous Key: Arthropods

Identifying the main arthropod groups by body plan.

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digraph ArthropodKey {
  rankdir=TB;
  node [shape=box, style=rounded];
  Q1 [label="3 body parts, 6 legs?"];
  Q2 [label="2 body parts, 8 legs?"];
  Q3 [label="One pair of legs per segment?"];
  Insects; Arachnids; Centipedes; Millipedes;
  Q1 -> Insects [label="yes"];
  Q1 -> Q2 [label="no"];
  Q2 -> Arachnids [label="yes"];
  Q2 -> Q3 [label="no (many legs)"];
  Q3 -> Centipedes [label="yes"];
  Q3 -> Millipedes [label="no (two pairs)"];
}