Words similar to arthropods
Example sentences for: arthropods
How can you use “arthropods” in a sentence? Here are some example sentences to help you improve your vocabulary:
The three possible relationships of these animal phyla are: (I) arthropods + vertebrates, (II) arthropods + nematodes, and (III) nematodes + vertebrates.
Although it is possible that a basal position of nematodes is the result of some unknown and widespread bias not yet identified, a simpler explanation is that the grouping of nematodes with arthropods is an artifact that arose from the analysis of a single gene, 18S rRNA.
Moreover, the molting cuticles of arthropods (chitin) and nematodes (collagen) are not homologous [ 4 ] . The significance of other morphological characteristics bearing on the position of nematodes continues to be debated [ 26 ] .
In analyses of the 18S rRNA gene, nematodes typically appear basal to arthropods + vertebrates.
An analysis of small subunit ribosomal RNA (18S rRNA) sequences challenged this arrangement by placing acoelomate and pseudocoelomate phyla in more derived positions among the protostomes, and in further defining a clade (Ecdysozoa) of molting animals that includes arthropods and nematodes [ 3 ] . This "Ecdysozoa" hypothesis has influenced diverse fields [ 4 ] and interpretations of developmental evolution in animals [ 5 6 7 ] . Since its publication, evidence has appeared both for and against this hypothesis [ 8 9 10 11 12 13 14 15 ] . Knowing the branching order of the major animal lineages, especially those three with fully sequenced genomes, is of importance to diverse fields such as medical genetics, physiology, neurobiology, paleontology, and astrobiology.
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