| 单词 |
polytypic |
| 释义 |
polytypic, a.|pɒlɪˈtɪpɪk|
[f. Gr. πολυ-, poly- + τυπικ-ός, f. τύπος type.]
1. Having several variant forms; esp., of a species, including several subspecies or other lower taxa. Also polyˈtypical a.
1888J. T. Gulick in Linn. Soc. Jrnl., Zool. XX. 201 Polytypic evolution or Divergent Evolution is any transformation of a species in which different types appear in different sections. 1890Amer. Jrnl. Sc. Ser. iii. XXXIX. 22 ‘A new species’ may be one that has been formed by monotypic transformation, the old form disappearing with the production of the new, or it may be one that has arisen through polytypic transformation. 1945Bull. Amer. Mus. Nat. Hist. LXXXV. 16/2 This morphological scope may be almost entirely filled or exploited by known species if the genus has many (is polytypic). 1953[see allopatric a.]. 1959New Biol. XXVIII. 81 This process [sc. the variation of isolated populations] might produce simply what the systematist calls a polytypic species, consisting of a sequence of subspecies each occupying a distinct geographical region and each somewhat different in ecology. 1970Nature 5 Sept. 1065/1 It is now recognized that Papio is a single polytypic species with morphologically different subspecies interbreeding wherever they meet. 1975Trans. R. Entomol. Soc. CXXVI. 613 We will discuss the data for this polytypic species under the four form names.
2. Cryst. Exhibiting polytypism (sense 1); of the nature of a polytype.
1944[see polytypism 1]. 1974Verma & Trigundayat in C. N. R. Rao Solid State Chem. ii. 52 The list of polytypic substances includes minerals, layer silicates, chalcogenides, and several other inorganic and organic compounds.
3. = polythetic a.
1959M. Beckner Biol. Way of Thought ii. 25 Polytypic concepts are found in many branches of biological theory, but the clearest instances are afforded by taxonomy. 1961G. G. Simpson Princ. Animal Taxon. ii. 43 The defining attributes do not appear in all individuals... The principle (which he calls ‘polytypic’) has been elucidated at greater length and in ultramodern terms by Beckner. |
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单词 polytype 释义 polytype|pltap|[a. mod.F. polytype: see poly- and type.]1. A cast, or f......