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The Caprellidea (Crustacea, Amphipoda) may reveal further interesting aspects of morphological evolution because they exhibit unique morphological features that are not observed in other crustaceans.
Our previous molecular phylogenetic analyses of the Caprellidea suggested that the Phtisicidae and Caprogammaridae regained the third and fourth pereopods, and the abdomen, respectively (Ito et al.
Like other peracarid crustaceans, including the Gammaridea and Isopoda, adult Caprellidea females have a brood pouch on their thoracic segments into which eggs are released.
scaura typica Mayer, 1890), which exhibits the typical body form of the Caprellidea (the third and fourth pereopods and abdomen are strongly reduced).
Fatty acid composition of the Caprellidea (Crustacea: Amphipoda) from the Strait of Gibraltar.
All Caprellidea species are marine and benthic and are typically found on substrata such as seaweed, hydroids, sponges, and sediment.
The general characteristics of the Caprellidea include a slender and cylindrical body, fusion of the head and the pereonite 1, rudimentary coxae, two pairs of gills, brood plates on pereonites 3 and 4, reduced or absent pereopods 3 and 4, and a degenerated abdomen and abdominal appendages.
Another Caprellidea family, the Phtisicidae, complicates this simplistic evolutionary scheme of the gradual degeneration of pereopods.
2003); however, the molecular phylogenetic relationships among the Caprellidea and their allies have not been analyzed.
Checklist of the benthic gammaridea and caprellidea (Crustacea: Peracarida: Amphipoda) from the Gulf of Mexico continental shelf and slope.