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- W2101748552 abstract "There are two current views regarding the phyletic organization of the arthropods. In one view, all arthropods [chelicerates, crustaceans, and uniramians (onychophorans, myriapods, and hexapods)] belong to a single phylum, arising through a complex evolutionary radiation that occurred some 500 to 600 million years ago; the second view holds that the arthro pods are polyphyletic, since embryological features suggest separate evo lutionary relationships between polychaetes and crustaceans, and between oligochaetes and uniramians (Anderson 1 973, Gupta 1979). Regardless which of these is correct, the metamerism of annelids and arthropods is generally thought to have arisen in a common ancestor of both groups, and both structural and embryological analyses provide evidence for a close relationship between the two groups. One such analysis of several shared features has led to the proposal of a particular phylogenetic affinity between leeches and insects (Sawyer 1 984). The relative closeness of these relationships has been somewhat compromised, however, by recent cross species comparisons of nucleic acid sequences. Metamery is also a feature of the chordates, and, interestingly, sequence analysis of 18s rRNA does not indicate that, among the eucoelomates, annelids and arthropods are" @default.
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- W2101748552 date "1990-03-01" @default.
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- W2101748552 title "Segmentation and Segmental Differentiation in the Development of the Central Nervous Systems of Leeches and Flies" @default.
- W2101748552 doi "https://doi.org/10.1146/annurev.ne.13.030190.001211" @default.
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