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Unformatted text preview: Elaborate filter feeding mechanism detailed in lab manual Adult retains separate anus and mouth opening, hermaphroditic with external fertilization SUBPHYLUM CEPHALOCHORDATA Amphioxus, Lancelets Notochord extends into head cavity Retain all 4 characteristics as adults Filter feeders, live in bottom substrate Gonochoristic with external fertilization, no larval stage SUBPHYLUM VERTEBRATA Thought to have evolved from Cephalochordates due to major similarities with Lamprey larvae and Cephalochordates TAXONOMY CHANGES CLASS AGNATHA IS NOW KNOWN AS SUPERCLASS AGNATHA CLASS MYXINI – HAGFISH CLASS PETROMYZONTES - LAMPREY...
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- Spring '09
- Zoology, pharyngeal gill slits, Lancelets, Hemichordates Deuterostomes