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Definition
| Lacking a body cavity between the gut and the outer body wall musculature,as in flatworms and proboscis worms. |
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| of or near the head end or toward the front plane of a body |
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| an external body part that projects from the body; "it is important to keep the extremities warm" |
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| relating to or consisting of or being in water, or operating or living or growing in water |
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| a liquid-filled sphere whose wall is composed of a single layer of cells |
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Definition
| the property of being symmetrical about a vertical plane |
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Definition
| a fluid filled cavity formed within the mesoderm |
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Definition
| that are characterized by radial, indeterminate cleavage and development of the anus from the blastopore |
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Definition
| belonging to or on or near the back or upper surface of an animal or organ or part |
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Definition
| the outer germ layer that develops into skin and nervous tissue |
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Definition
| animals except birds and mammals; having body temperature that varies with the environment |
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Definition
| the inner germ layer that develops into the lining of the digestive and respiratory systems |
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Definition
| animals that use metabolically generated heat to regulate body temperature independently |
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Definition
| the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs |
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Definition
| double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm |
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Definition
| lacking a backbone or spinal column |
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Definition
| lying away from the median and sagittal plane of a body |
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Definition
| native to or inhabiting the sea |
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Definition
| the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue |
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| moving or capable of moving readily |
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Definition
| not having the body separated into segmented parts |
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| Any animal, of the former taxon Protostomia, in which the mouth is derived from the embryonic blastopore |
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Definition
| the body cavity of an animal, such as a nematode, that is not fully lined with mesodermal cells |
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Definition
| A form of symmetry, arranged equally in all directions from a central point, thus any plane through the central point will divided into mirror image pieces |
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Definition
| having the body divided into successive metameres or segments |
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Definition
| permanently attached to a substrate; not free to move about |
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Definition
| an attribute of a shape or relation; exact reflection of form on opposite sides of a dividing line or plane |
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Definition
| of or relating to or inhabiting the land as opposed to the sea or air |
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Definition
| toward or on or near the belly |
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Definition
| animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium |
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