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Base of the evolutionary tree for Protostomes (Protostomia)

Protostomes (Protostomia) (1324343 species)
- unnamed group 911287 → (1324187 species)
  - Ecdysozoa → (1173386 species)
    - unnamed group 1062349 → (1173125 species)
      - unnamed group 1081204 → (1154270 species)
      - unnamed group 1062350 → (18855 species)
    - Penis worms and more (Scalidophora) → (261 species)
      - mud dragons (Kinorhyncha) → (208 species)
      - Nanaloricida → (30 species)
      - penis worms (Priapulida) → (23 species)
  - Spiralia → (150801 species)
    - unnamed group 914955 → (147134 species)
      - Trochozoa → (121944 species)
      - unnamed group 914956 → (25190 species)
    - Gnathifera → (3667 species)
      - unnamed group 911393 → (3563 species)
      - Jaw Worms (Gnathostomulida) → (104 species)
- Arrow worms (Chaetognatha) → (156 species)
  - Aphragmophora → (83 species)
    - Ctenodontina → (78 species)
      - Sagittidae → (77 species)
      - Pterosagitta draco
    - Flabellodontina → (3 species)
    - Bathybelos typhlops
    - Pterokrohnia arabica
  - Phragmophora → (51 species)
    - Spadellidae → (34 species)
      - Spadella → (20 species)
      - Paraspadella → (10 species)
      - Bathyspadella → (2 species)
      - Calispadella alata
      - Hemispadella dauvini
    - Eukrohniidae → (14 species)
      - Eukrohnia → (13 species)
      - Zahonya cestoda
    - Krohnittellidae → (3 species)
  - Heterokrohnia → (17 species)
  - Archeterokrohnia → (4 species)
  - Xenokrohnia sorbei

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