Protostome
noun, Zoology.
1.
any member of the lower invertebrate phyla in which the mouth appears before the anus during development, cleavage is spiral and determinate, and the coelom forms as a splitting of the mesoderm.
protostome
(prōt’tə-stōm’)
Any of a major group of animals defined by its embryonic development, in which the first opening in the embryo becomes the mouth. At this stage of development, the later specialization of any given embryonic cell has already been determined. Protostomes are one of the two groups of animals having a true body cavity (coelom) and are believed to share a common ancestor. They include the mollusks, annelids, and arthropods. Compare deuterostome.
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A query system for English text. [Sammet 1969, p. 669].
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[proh-tuh-theer-ee-uh n] /ˌproʊ təˈθɪər i ən/ adjective 1. belonging or pertaining to the group Prototheria, comprising the monotremes. noun 2. a prototherian animal. prototherian /ˌprəʊtəʊˈθɪərɪən/ adjective 1. of, relating to, or belonging to the Prototheria, a subclass of mammals that includes the monotremes noun 2. any prototherian mammal; a monotreme
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noun, Biology. 1. a microorganism that has the same nutritional requirements as the parent organism. Compare auxotroph. 2. an organism or cell capable of synthesizing all its metabolites from inorganic material, requiring no organic nutrients. prototroph pro·to·troph (prō’tə-trŏf’, -trōf’) n. A bacterial strain that has the same nutritional requirements as the wild type strain from […]
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[proh-tuh-trof-ik, -troh-fik] /ˌproʊ təˈtrɒf ɪk, -ˈtroʊ fɪk/ adjective 1. (especially of certain bacteria) requiring only inorganic substances for growth. 2. (of certain microorganisms) requiring no specific nutriments for growth. prototrophic /ˌprəʊtəˈtrɒfɪk/ adjective 1. (esp of bacteria) feeding solely on inorganic matter 2. (of cultured bacteria, fungi, etc) having no specific nutritional requirements
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noun 1. the original or model on which something is based or formed. 2. someone or something that serves to illustrate the typical qualities of a class; model; exemplar: She is the prototype of a student activist. 3. something analogous to another thing of a later period: a Renaissance prototype of our modern public housing. […]