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Updated: May 6, 2025
Conseil used the methods of our mentor Professor Milne-Edwards, who puts the decapods in three divisions: Brachyura, Macrura, and Anomura. These names may look a tad fierce, but they're accurate and appropriate.
Protected by the abdomen of the Crab, or by the shell inhabited by the Pagurus, the parasite also no longer required the calcareous test, in which, no doubt, the first Cirripedes settling upon these Decapods rejoiced.
Smith interpreted the alteration in the male as a development of female secondary characters, but it is obvious from the condition in Macrura or tailed Decapods, like the lobster or crayfish, that the abdomen or tail of the male originally carried appendages similar to those of the female, and that the male character is a loss of these appendages.
The female crawfish, like the lobster, travels about with her eggs held in peculiar arm-like organs under her jointed tail where they are protected from being devoured by other animals. There they remain until hatched; but the young crawfish does not experience the metamorphosis peculiar to most decapods.
Crustaceans are subdivided into nine orders, and the first of these consists of the decapods, in other words, animals whose head and thorax are usually fused, whose cheek-and-mouth mechanism is made up of several pairs of appendages, and whose thorax has four, five, or six pairs of walking legs.
Would you be so good as to find out for me, for sure, whether he has been drowned or not?" "Oh, he isn't drowned," said the porpoises. "If he were, we would be sure to have heard of it from the deep-sea Decapods. We hear all the salt-water news.
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