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23 Cards in this Set
- Front
- Back
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An animal that lacks an internal body cavity |
Acoelmate |
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An opening in the surface of some early embryos ; when cells move around during gastrulation |
Blastopore |
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One plane of symmetry ; humans |
Bilateral symmetry |
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Mitotic cell division without cell growth and no change in cell size |
Cleavage |
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A fluid-filled space separating the digestive tract from the outer body wall with the mesoderm |
Coelum |
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Large number of neurons aggregated into clusters called ganglia ; vertebrates consists of the brain and spinal cord |
Central Nervous System (CNS) |
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Protists that are close living relatives to animals |
Choanoflagellates |
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An animal that has a true coelem ; completely lined with mesoderm |
Coelmate |
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Pattern of embryonic development ; anus first |
Deuterostome |
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Animals that have two types of tissues |
Diploblasts |
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Germ layer that gives rise to skin and nervous system |
Ectoderm |
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Germ layer that gives rise to the lining of the digestive tract |
Endoderm |
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A rearrangement of the embryo ; folds into the blastocoel ; formation of layers (i.e. germ layers) |
Gastrulation |
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Three basic types of tissue formed during gastrulation |
Germ layers (Endoderm, Ectoderm, Mesoderm) |
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Germ layer that gives rise to the circulatory system, muscles, and internal structures such as bones and organs |
Mesoderm |
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A nervous system in which neurons are diffuse instead of being clustered into large ganglia or tracts ; found in cnidarian ctenophores |
Neural net |
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Pattern of embryonic development ; mouth first |
Protostome |
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An animal that has a coelom that is only partially lined with mesoderm |
Pseudocoelomate |
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At LEAST two planes of symmetry |
Radial symmetry |
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Adults live permanently attached to a substrate ; do not move |
Sessile |
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Animals that have three types of tissues |
Triploblasts |
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Protostome animals that secrete external skeletons (exoskeletons) |
Ecdysozoa |
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Protostome animals that have a trochophore larva before metamorphosis |
Lophotrochozoa |
