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microspecies Taxonomy.|ˈmaɪkrəʊˌspiːʃiːz, -ˌspiːsiːz|
[f. micro- + species n.]
A species differing only in minor characters from others of its group, often one of limited geographical range forming part of an aggregate species.
1916J. P. Lotsy Evolution by Means of Hybridization i. 22 They have subsequently been called: mikrospecies, Jordanian species, subspecies, small species or elementary species indiscriminately. 1922G. C. Druce Flora Zetlandica in Bot. Exchange Club VI. Suppl. 45 Twenty-two micro species of Hieracia are found in the Faroes. 1946Nature 19 Oct. 535/2 The genus Psalliota..consists of ‘species’ or ‘microspecies’ extremely difficult to separate one from another. 1953E. Mayr et al. Methods & Princ. Syst. Zool. ii. 39 Although conventionally referred to as races, reproductively isolated chromosomal populations are more logically designated (micro)species. 1963Davis & Heywood Princ. Angiosperm Taxon. xiii. 425 In large critical groups of species the difficulty of deciding to which species various subspecies should be subordinated encourages the taxonomist (often against his inclinations) to maintain numerous microspecies.
▸ Chem. A compound differing from others of the same composition in some aspect of structure (esp. protonation).
1958Jrnl. Physical Chem. 62 429 The titration of the porphyrin free base to a monosalt and then to a disalt is expected to result in spectral changes according to the concentration of the three microspecies. 1976Inorg. Chem. 15 2304 The more highly protonated ligands should be considered as thermodynamic entities each composed of several microspecies in equilibrium. 1997Jrnl. Pharmaceutical Sci. 86 865/1 Several microspecies of a compound may exist in a protic solvent. |