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21 Cards in this Set
- Front
- Back
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3 Phyla of Deuterostomes
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-Echinodermata (sea stars + sea urchins)
-Hemichordata (acorn worms: deposit/suspension feeders) -Chordata (vertebrates) |
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Vertebrates
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Animals that have a skull
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Water Vascular system
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A system of fluid filled tubes and chambers in echinoderms. Functions as a hydrostatic skeleton.
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Tube Feet
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Small mobile, fluid-filled extensions of the water vascular system of echinoderms. Used in locomotion.
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Podia
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The part of the tube foot of an echinoderm that extends outside of the body and makes contact with the substrate
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Pharyngeal gill slits
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A set of parallel openings from the throat through the neck to the outside. One of the diagnostic traits of chordates.
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Notochord
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A long, gelatinous, supportive rod down the back of a chordate embryo, below the developing spinal chord. Replaced by vertebrae in adult vertebrates. A defining feature of chordates.
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Dorsal Hollow Nerve Chord
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A bundle of nerves extending fromt he brain along the dorsal side of a chordate animal, with cerebrosipinal fluid inside a hollow central channel. One of the defining features of chordates.
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3 Major Lineages of Chordates
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-Urochordates: small suspension feeders that live atached to hard substrates in the ocean as adults
-Cephalochordates: small mobile suspension feeders -Vertebrates: sharks, bony fish, reptiles, mammals |
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Somites
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A block of mesoderm on both sides of the developing spinal cord in a vertebrate embryo. Gives rise to muscle tissue, vertebrae, ribs, limbs...
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Amniota
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Lineage of vertebrates that includes all tetrapods other than amphibians
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Amniotic egg
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Egg that has a watertight shell or case enclosing a membrane-bound food supply, water supply, waste repository. Gave vertebrates ability to reproduce away from H20
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Gill Arches
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Curved regions of tissue between the gills. Hypothesized that mutations in these led to formation of jaw
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Pharyngeal Jaw
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Modified gill arches that function as a second set of jaws, located in the back of the mouth. Make food processing particularly efficient.
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Albumen
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A solution of wate and protein (particularly albumins), found in amniotic eggs, that nourish the growing embryo. (Egg white)
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Amnion
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Protective inner membrane in which embryo of amniotic egg is enveloped
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Yolk Sac
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membranous pouch that contains nutrients for growing embryo
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Allantois
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membranous pouch that holds waste material in amniotic egg
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Chorion
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middle membrane that separates amnion, yolk sac, allantois from albumen + provides surface where gas exchange can take place between embryo and surrounding air
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Amniotic Egg Picture
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see pic
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Placenta
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organ rich in blood vessels that facilitates flow of oxygen and nutrients form mother to developing offspring.
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