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Definition
| Having body derived from only two embryonic cell layers (ectoderm; endoderm) |
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| 3 layers (ectoderm; mesoderm; endoderm); bilaterally symmetrical (bilateria). e.g. annelids, molluscs, starfish, vertebrates |
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| Body cavity in Metazoans (all animals except protozoans and sponges), between the intestinal canal and body wall |
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Definition
Outer layer of triploblastic animals; includes:
- Epidermis
- Nervous System
-Lining of mouth and anus |
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Definition
Middle layer of triploblasts; includes:
-Muscle
-Bones
-Heart
-Kidneys |
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Definition
Inner layer of triploblasts; includes:
-Lining of gut, and organs that develope from it (e.g. lungs; liver) |
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Definition
| Mouth develops first/as primary embryonic opening. |
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Definition
| Mouth forms second, after anus (e.g. Hemichordatal Echinodermata; Vertebrata) |
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Definition
Retention of juvenile characteristics into the reproductive stage.
-Progenesis: Early sexual maturation; sexual maturation in otherwise immature individual
-Neoteny: Delayed somatic changes; mature animals that retain juvenile traits
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Term
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Definition
| In enterocoely, a mesoderm is formed in a developing embryo, in which the coelom forms from pouches "pinched" off of the digestive tract (also known as the embryonic gut, or archenteron). This type of coelom formation occurs in deuterostome animals, which for this reason are also known as enterocoelomates. |
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| Schizocoely (adjective forms: schizocoelous or schizocoelic) is a process by which some animal embryos develop. Animals which develop through schizocoely are known as schizocoelomates. Schizocoely occurs when a coelom (body cavity) is formed by splitting the mesodermal embryonic tissue. |
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Definition
A genetic shift in the timing of development of a body part relative to the ancestral condition.
May involve different growth rates between reproductive organs and rest of body. |
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Definition
| Segmentally arranged skeletal elements forming the vertebral column of Vertebrata |
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| Portion of a vertebra covering the spinal cord. |
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Definition
| Vertebral enclosure of the caudal artery and vein. |
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