Abstract
Crayfishes inhabiting the northern hemisphere and discussed below belong to the superfamily Astacoidea. Species of this superfamily have the first and second pairs of pleopods present. The first pair of the female may be quite small, but for the male these , and the second pair, are modified as sperm transference organs [gonopods, figs. 4.4-4.6, C]. These crayfishes also have a complete transverse suture on the telson (fig. 3.1, B) and the posterior part of the of uropods [ur, fig. 1.1, A) are well calcified. These combined features distinguish astracid crayfishes from the parastacid species (see section 11.1) imported from the southern hemisphere.
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© 1997 Ray Ingle
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Ingle, R. (1997). Freshwater Crayfishes (Astacoidea). In: Crayfishes, Lobsters and Crabs of Europe. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5872-5_4
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DOI: https://doi.org/10.1007/978-94-011-5872-5_4
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