Abstract
Sugahara et al. (2017) reported that unlike the wild type, the albino strain of Schistocerca gregaria does not show phase-dependent shift in the morphometric ratio of F/C (= length of the hind femur/maximum width of the head [caput]). In contrast, my old, unpublished, observations clearly demonstrate that S. gregaria albinos exhibited considerable phase-dependent shift in the morphometric ratios F/C and E/F (= length of the fore-wing [elytron] divided by length of the hind femur). Considering the report of Sugahara et al. (2017), I decided to publish my old results.
Highlights
Materials and methodsIn a recent publication, the genetic background of albinism and the related molecular biology of corazonin were studied in two species of locusts, Locusta migratoria (L.) and Schistocerca gregaria (Forsk.)
The genetic background of albinism and the related molecular biology of corazonin were studied in two species of locusts, Locusta migratoria (L.) and Schistocerca gregaria (Forsk.)
Concerning S. gregaria, the authors reported that “unlike the wild type, the albino strain of this locust did not show a phase-dependent shift in a morphometric trait ...” (Sugahara et al 2017, abstract, p. 41)
Summary
The genetic background of albinism and the related molecular biology of corazonin were studied in two species of locusts, Locusta migratoria (L.) and Schistocerca gregaria (Forsk.). The manuscript was devoted to a portion of the morphometric ratios of S. gregaria albinos in comparison with these ratios in normally colored conspecific locusts. A portion of newly molted normally colored adult locusts were separated from the F7 generation of the crowded locusts and placed each into a separate celluloid cage They were considered as a transitional generation from crowding to isolation. Hatchlings from eggs laid by this transitional generation constituted Fs1 isolated generation This method for establishing isolated stocks was described later by Maeno and Tanaka (2009) studying phase-dependent morphometric changes in S. gregaria. Colored isolated stock was again separated from the crowded stock by the same method, F14 constituting the transitional generation and FsI the first isolated generation measured. This extra molt and extra eye stripe is more common in isolated females of S. gregaria than in males (Maeno and Tanaka 2009)
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