Lecture 10 Biology 2

Lecture 10 Biology 2 - Chordates and Vertebrates I....

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Chordates and Vertebrates I. Echinodermata—sister group to the Chordates Deuterostomes II. Phylum Chordata A. Characteristics B. “Invertebrate” chordates Subphylum Urochochordata (tunicates) Subphylum Cephalochordata (lancelets) III. Subphylum Vertebrata Classification: Phylum Chordata Subphylum: Urochordata (tunicates) Subphylum: Cephalochordata (lancelets) Subphylum: Vertebrata 52,000 species Phylum—Chordata 4 characteristics 1) Notochord—flexible rod for support 2) 3) Pharyngeal pouches (embryonic structures) -- Gills, filters, ears 4) Tail (may be lost during embryo development) -- Propulsion, balance
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Phylum--Chordata • 2 “invertebrate” subphyla— have a notochord: –Tunicates (Urochordata) –Lancelets (Cephalochordata) • Notochord becomes part of the skeleton in vertebrates Tunicate—Subphylum Urochordata Lancelet—Subphylum Cephalochordata
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Subphylum--Vertebrata •Cepha l i za t ion - -
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Lecture 10 Biology 2 - Chordates and Vertebrates I....

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