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• W1987127029 abstract "AS the systematists, especially paleontologists, are deliberating on the merits and demerits of recognizing parataxa, a Russian paleontologist, Korobkov, makes a proposal that we should recognize still another morphologic unit, an adaptive form (Forma accommodata) which is to be reckoned with in the evaluation of existing genera and subgenera of mollusks. This new morphologic entity, forma accommodata (adaptive form), as proposed by Korobkov is to include a series of species which were heretofore regarded as belonging to distinct genera. Korobkov's proposal is the result of a critical systematic study of certain groups of pectens. As his paper was published in the Russian language with only a few lines of English summary, it is felt that a slightly abridged translation of Korobkov's entire article may be of interest to other systematists who cannot read the language. Korobkov points out that every large work on pectens includes an introduction of new genera, subgenera, or sections. The systematics of this family has become so complicated that it is commonly much easier to identify a specimen as to the species than to assign it to the proper genus. Much of the confusion in this study is ascribed by Korobkov to the subjective nature of reasoning by some authors. AccoQrding to Korobkov, there appear to be three main bases for distinguishing the different taxa of Pectinidae-phylogenetic, purely morphologic, and morphologicfunctional or adaptive. Systematists who work on the phylogenetic basis view the different species of pectens as originating from a common ancestor. This approach implies that the group is viewed as a monophyletic series. The strictly morphologic criteria, in contrast to phylogenetic characters, consist of a series of common characters without any regard for the origin of species, their geographic distribution, or the ecologic significance of the observed characters. Finally, the morphologic-functional or adaptive concept treats the genera as groups of species which adapted themselves to a similar mode of life, kthe result of which was the development of certain common morphologic characters. Some investigators, accepting the morphologic-functional plan of classification, ascribe especially great significance to the geologic distribution of species and place in each genus only the species of the same age, inhabiting the same geographic province. The differences in the concepts of the genus produce taxa of widely variable scope. The disregard of the principle of monophyletic series generally results in the creation of a number of artificial genera. For example, all species of pectens which have adapted themselves to the sessile or resting mode of life and at the same time have changed the form of their shell and sculpture, have been united in a single genus Hinnites Defrance. This genus occurs from the Jurassic to Recent. Later, a separate genus, Prohinnites Gillet, was proposed to include all the Mesozoic species. A number of investigators have shown that the recent species Hinnites distortus DaCosta is closely con-" @default.
• W1987127029 created "2016-06-24" @default.
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• W1987127029 date "1958-06-01" @default.
• W1987127029 modified "2023-09-25" @default.
• W1987127029 title "Korobkov's Proposal of a New Morphologic Entity, Forma accommodata, in Mollusca" @default.
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• W1987127029 doi "https://doi.org/10.2307/2411796" @default.
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