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Chordata Classification Notes Summary & Study Notes

These study notes provide a concise summary of Chordata Classification Notes, covering key concepts, definitions, and examples to help you review quickly and study effectively.

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Notes

🧭 Protochordata

PROTOCHORDATA (Acranita / Lower chordates) are the primitive chordates that usually lack a true vertebral column. They include two main subgroups: UROCHORDATA and CEPHALOCHORDATA.

🧬 Euchordata

EUCHORDATA (Craniata / Higher chordates) possess a skull and typically a vertebral column. The main internal divisions are:

  • Subphylum: VERTEBRATA — animals with a vertebral column.
  • Division: AGNATHA (lacks jaw). This division leads to the class CYCLOSTOMATA.
  • Division: ŒNATHOSTOMATA (Bears Jaw) — jawed vertebrates.
  • Super Class: PISCES — fishes; includes two classes: CHONDRICHTHYES and OSTEICHTHYES.
  • Super Class: TETRAPODA — four-limbed vertebrates; classes include AMPHIBIA, AVES, REPTILIA, and MAMMALS.

🐟 PISCES

Super Class: PISCES — fishes; subdivided into two classes: CHONDRICHTHYES (cartilaginous fishes) and OSTEICHTHYES (bony fishes).

🐾 TETRAPODA

Super Class: TETRAPODA — four-limbed vertebrates; includes the classes AMPHIBIA, AVES, REPTILIA, MAMMALS.

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Chordata Classification Notes Study Notes | Cramberry