chapter 38 section 2 invertebrate chordates. phylum chordata chordates- animals with a vertebrate...
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Chapter 38
Section 2
Invertebrate Chordates
Phylum Chordata• Chordates- animals with a
vertebrate (backbone)
• Have a notochord, pharyngeal pouches, dorsal nerve cord, & postanal tail
Evolution & Classification
• Phylum Chordata is separated into three subphyla
• Vertebrata
• Cephalochordata
• Urochordata
Subphylum Cephalochordata
• Lancelets- notochord, dorsal nerve cord, pharyngeal pouches, & postanal tail
• Live in warm shallow waters in the sand
• Water leaves body through an opening called the atriopore
Subphylum Cephalochordata
• Lancelets can swim weakly
• Segmented body
Subphylum Urochordata
• Tunicates- “sea squirts”- shoot out water when touched
• Most are sessile & live on sea bottom
• Filter-feed
• Hermaphrodites
REVIEW!!!• What are the three subphyla of the
phylum chordata?
• Name an animal from each subphyla.
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