File:Evolution and adaptation (1903) (14595363159).jpg

Identifier: evolutionadaptat00morg (find matches)
Title: Evolution and adaptation
Year: 1903 (1900s)
Authors: Morgan, Thomas Hunt, 1866-1945
Subjects: Evolution Adaptation (Biology) Evolution Adaptation, Biological
Publisher: New York, The Macmillan company London, Macmillan & co., ltd.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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sisting of a mere distorted mass, because theseextraordinary differences between the two sexes are no doubtrelated to their widely different habits of life. Nevertheless,it is important to observe that such extreme differences mayexist in cases where sexual selection cannot come in, becauseof the absence of eyes in the female. In regard to another copepod, Saphirina, Darwin pointsout that the males are furnished with minute scales, whichexhibit beautiful changing colors, and these are absent inthe females; yet he states that it would be extremely rashto conclude that these curious organs serve to attractthe females. Differences in the sexes are also found in one Darwins Theory of Sexual Selection 177 species of Squilla, and a species of Gelasimus. In the lattercase Darwin thinks that the difference is probably due tosexual selection. In addition to these cases, recorded byDarwin, there may be added the two remarkable cases,shown in our Figure 2 A, B, of Calocalanus pavo, the female of
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