Invertebrate Chordates

• Phylum Chordata Subphylum Chephalochordata - lancelets
• Phylum Chordata Subphylum Urochordata - sea squirts
• male amphioxus cs

  A) Muscle Myotome

  B) Pharynx

  C) Testes

  D) Gill Bar + Slits

  E) Notochord

  F) Spinal cord

  
• Phylum Chordata Subphylum Vertebrata Class Amphibia Order Anura - Frogs
• Tunic - offers protection

  
• The larval stage of the tunicate possesses all of the features characteristic of chordates: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
•  Adults only maintain pharyngeal slits and lack a notochord, a dorsal hollow nerve cord, and a post-anal tail.