An Overview of Animal Diversity
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| 1200541109 | tissues | groups of similar cells that perform a specific function in an organism | 0 | |
| 1200541110 | cleavage | a succession of mitotic cell divisions without cell growth between the divisions | 1 | |
| 1200541111 | blastula | The hollow ball of cells marking the end stage of cleavage during early embryonic development | 2 | |
| 1200541112 | gastrulation | the process in which a gastrula develops from a blastula by the inward migration of cells | 3 | |
| 1200541113 | gastrula | double-walled stage of the embryo resulting from invagination of the blastula | 4 | |
| 1200541114 | larva | the immature free-living form of most invertebrates and amphibians and fish which at hatching from the egg is fundamentally unlike its parent and must metamorphose | 5 | |
| 1200541115 | metamorphosis | the marked and rapid transformation of a larva into an adult that occurs in some animals | 6 | |
| 1200541116 | Ediacaran biota | An early group of soft-bodied, multicellular eukaryotes known from fossils that range in age from 565 million to 545 million years old. | 7 | |
| 1200541117 | Cambrian explosion | A burst of evolutionary origins when most of the major body plans of animals appeared in a relatively brief time in geologic history; recorded in the fossil record about 545 to 525 million years ago. | 8 | |
| 1200541118 | body plan | In animals, a set of morphological and developmental traits that are integrated into a functional whole—the living animal. | 9 | |
| 1200541119 | radial symmetry | body plan in which body parts repeat around the center of the body | 10 | |
| 1200541120 | bilateral symmetry | the property of being symmetrical about a vertical plane | 11 | |
| 1200541121 | dorsal | Pertaining to the back | 12 | |
| 1200541122 | ventral | Pertaining to the front | 13 | |
| 1200541123 | anterior | located in front or forward | 14 | |
| 1200541124 | posterior | Towards the back of the body | 15 | |
| 1200541125 | cephalization | concentration of sense organs and nerve cells at the front of an animal's body | 16 | |
| 1200541126 | endoderm | the inner germ layer that develops into the lining of the digestive and respiratory systems | 17 | |
| 1200541127 | ectoderm | The outermost of the three primary germ layers in animal embryos; gives rise to the outer covering and, in some phyla, the nervous system, inner ear, and lens of the eye | 18 | |
| 1200541128 | diploblastic | Having two germ layers. | 19 | |
| 1200541129 | mesoderm | the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue | 20 | |
| 1200541130 | triploblastic | Possessing three germ layers: the endoderm, mesoderm, and ectoderm. Most eumetazoans are triploblastic. | 21 | |
| 1200541131 | body cavity | A fluid-containing space between the digestive tract and the body wall. | 22 | |
| 1200541132 | coelom | a cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavity | 23 | |
| 1200541133 | coelomates | An animal that possesses a true coelom (a body cavity lined by tissue completely derived from mesoderm). | 24 | |
| 1200541134 | pseudocoelomates | An animal whose body cavity is lined by tissue derived from mesoderm and endoderm. | 25 | |
| 1200541135 | acoelomates | A solid-bodied animal lacking a cavity between the gut and outer body wall. | 26 | |
| 1200541136 | protostome development | In animals, a developmental mode distinguished by the development of the mouth from the blastopore; often also characterized by spiral cleavage and by the body cavity forming when solid masses of mesoderm split. | 27 | |
| 1200541137 | deuterostome | animal whose anus is formed from the blastopore of a blastula | 28 | |
| 1200541138 | spiral cleavage | A type of embryonic development in protostomes, in which the planes of cell division that transform the zygote into a ball of cells occur obliquely to the polar axis, resulting in cells of each tier sitting in the grooves between cells of adjacent tiers. | 29 | |
| 1200541139 | determinate cleavage | A type of embryonic development in protostomes that rigidly casts the developmental fate of each embryonic cell very early. | 30 | |
| 1200541140 | blastopore | The opening of the archenteron in the gastrula that develops into the mouth in protostomes and the anus in deuterostomes | 31 | |
| 1200541141 | radial cleavage | A type of embryonic development in deuterostomes in that the planes of cell division that transform the zygote into a ball of cells are either parallel or perpendicular to the polar axis, thereby aligning tiers of cells one above the other. | 32 | |
| 1200541142 | indeterminate cleavage | A type of embryonic development in deuterostomes, in which each cell produced by early cleavage divisions retains the capacity to develop into a complete embryo. | 33 | |
| 1200541143 | archenteron | The endoderm-lined cavity, formed during the gastrulation process, that develops into the digestive tract of an animal. | 34 | |
| 1200541144 | eumetazoans | Member of a clade of animals with true tissues. | 35 | |
| 1200541145 | bilaterians | member of a clade of animals with bilateral symmetry and three germ layers. | 36 | |
| 1200541146 | ecdysozoans | Member of a group of animal phyla identified as a clade by molecular evidence. Many ecdysozoans are molting animals. | 37 | |
| 1200541147 | lophotrochozoans | refers to animals in the taxa who either develop a lophophore or go through the trochophore larva stage | 38 | |
| 1200541148 | lophophore | A horseshoe-shaped or circular fold of the body wall bearing ciliated tentacles that surround the mouth. | 39 | |
| 1200541149 | trochophore larva | Distinctive larval stage observed in some lophotrochozoan animals, including some annelids and molluscs. | 40 |
