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• W2186842500 abstract "Abstract The evolution of megadriles is analysed employing the traditional comparative method supplemented with palaeogeographic information drawn from plate tectonics. The origin of the group is considered in relation to special physiological and developmental strategies which evolved in response to life in compact soil and the acquisition of a larger body size. Further evolution, also related to the terricolous habits, implied differentiations of intestinal structures and modifications of the mating mechanics. The required modifications went on in divergent ways in the three superfamilies Lumbricoidea, Megascolecoidea, and Eudriloidea. The most primitive among the Lumbricoidea, which stemmed from some strain akin to the Haplotaxidae, are limicolous and are distributed over a broad territory corresponding to the northern and central regions of the Lower Triassic Pangaea. Based on ovarian structure, these megadriles may be divided into a northern strain, that originated in Laurasia, and a southern strain, that originated in Gondwana. The geographical range of the main families of Lumbricoidea suggests that they differentiated at a time when the continental masses were separated during the Cretaceous. The most primitive among the Megascolecoidea are the Ocnerodrilidae, which are mostly limnic. Some peculiarities of their sexual apparatus suggest that they might have derived from a strain akin to the Alluroididae. On account of their more advanced adaptations of the copulatory apparatus, the fully terrestrial families Acanthodrilidae and Octochaetidae appear to have derived from some ocnerodrilid ancestor. The geographical range of the Octochaetidae suggests that they evolved in the central region of Triassic Pangaea. The distribution of the Acanthodrilidae supports the hypothesis that they originated in southern and eastern Gondwana and then spread into the western and northern regions, but the taxon is possibly polyphyletic. The Megascoleci‐dae, which are the most diverse family of the group, appear to have stemmed from some ancestor akin to the acanthodrilids following their acquisition of further anatomical and physiological modifications of the copulatory apparatus. Native to Australia and New Zealand, they spread northwards to Indochina and the Asian Far East, as well as to the Pacific coast of North America ‐ possibly during the Cenozoic era. The Eudriloidea, endemic to intertropical Africa, are characterized by the extreme variation of the sexual apparatus, particularly the female structures. They probably took origin from an alluroidid ancestor, but not the same one from which the Megascolecoidea originated. In this superfamily, evolutionary processes seem to have proceeded more rapidly. More generally, the evolution of megadriles is characterized by numerous instances of convergence and remarkably slow speed, but speciation events in Megascolecidae and Eudrilidae were apparently very frequent." @default.
• W2186842500 created "2016-06-24" @default.
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• W2186842500 date "2000-01-01" @default.
• W2186842500 modified "2023-09-29" @default.
• W2186842500 title "Evolution and biogeography of megadriles (Annelida, Clitellata)" @default.
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• W2186842500 doi "https://doi.org/10.1080/11250000009356313" @default.
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