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Summary

Description
English: Alignment of anterior somites (body segments), tagmata and appendages across various euarthropod taxa. Extinct taxa based on the most widely-accepted interpretations of mid 2010s.
  • †: Extinct taxa
  • 0: Ocular somite
  • 1-2: Somite 1-10 (further somite(s) ommited)
  • Dark grey: Somite(s) of head tagma (head/cephalon/prosoma)
  • Red/P: Protocerebral somite/appendage
  • Yellow/D: Deutocerebral somite/appendage
  • Blue/T: Tritocerebral somite/appendage

Fuxianhuiida (fuxianhuiid):

  • Ce: Cephalon
  • Tr: Trunk
  • Hy/Lbr: Hypostome/labrum complex
  • An: Antenna
  • SPA: Specialized post-antennal appendage
  • L: (Arthropodized) Leg/walking leg

Megacheira (megacheiran/great appendage arthropod):

  • Ce: Cephalon
  • Tr: Trunk
  • Hy/Lbr: Hypostome/labrum complex
  • SGA: Short-great appendage
  • L: (Arthropodized) Leg/walking leg

Artiopoda (artiopodan/artiopod: trilobite, aglaspidid etc.):

  • Ce: Cephalon
  • Tr: Trunk
  • Hy/Lbr: Hypostome/labrum complex
  • An: Antenna
  • L: (Arthropodized) Leg/walking leg

Chelicerata: Pycnogonida (pycnogonid/sea spider):

  • Ce: Cephalon
  • Tr: Trunk
  • Ab: Abdomen
  • ?: (Appendage unknown)
  • Chf: Chelifore
  • P: Palp
  • Ovg: Oviger
  • L: (Arthropodized) Leg/walking leg

Chelicerata: Euhelicerata (euchelicerate: "merostome" and arachnid):

  • Pr: Prosoma
  • Op: Opisthosoma
  • Hy/Lbr: Hypostome/labrum complex
  • Chr: Chelicera
  • Pp: Pedipalp
  • L: (Arthropodized) Leg/walking leg

Myriapoda (myriapod: centipede, millipede etc.):

  • He: Head
  • Tr: Trunk
  • Hy/Lbr: Hypostome/labrum complex
  • An: Antenna
  • Inc: intercalary segment
  • Mnd: Mandible
  • Mx1: First maxilla
  • Mx2: Second maxilla
  • L: (Arthropodized) Leg/walking leg

"Crustacea" (crustacean: shrimp, crab, barnacle, waterflea etc.):

  • He: Head
  • Tx: Thorax
  • Ab: Abdomen
  • Hy/Lbr: Hypostome/labrum complex
  • An1: First antenna/antennula/antennule
  • An2: Second antenna/antenna
  • Mnd: Mandible
  • Mx1: First maxilla/maxillula
  • Mx2: Second maxilla/maxilla
  • L: (Arthropodized) Leg/walking leg

Hexapoda (hexapod: insect, springtail etc.)

  • He: Head
  • Tx: Thorax
  • Ab: Abdomen
  • Hy/Lbr: Hypostome/labrum complex
  • An: Antenna
  • Inc: intercalary segment
  • Mnd: Mandible
  • Mx: Maxilla
  • Lbi: Labium
  • L: (Arthropodized) Leg/walking leg

Panarthropod version:

Extant panarthropod version:

References:

Overall review.
Chelicerata, Megacheira.
日本語:
Date
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Author Junnn11

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