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COELOM
Fluid-filled internal body cavity
Deuterostomes include
echinoderms, hemichordates, and chordates
Gastrulation
Indentation formation in early embryonic stage that later forms into gut.
Three Basic tissue layers of embryo
Ectoderm, mesoderm, endoderm
Deuterostomes refers to
"second-mouth" in which mouth forms opposite from blastopore.
Cephalochordates and Urochordates
Chordates that lack bony or cartilaginous skeletons, filter feeders
Five fundamental features of Chordates
1. notochord
2. pharyngeal slits
3. endostyle or thyroid gland
4. dorsal hollow nerve chord forming central nervous system
5. postanal tail
Notochord
A long axial rod composed of connective tissue all around fluid-filled space. More derived vertebrates will replace it with vertebral column.
Pharyngeal Slits
Possible feeding accessory in basal chordates, can form gill slits. Disappear in many chordates before birth.
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