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(microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered plants bacteria , bacterium
extinct group of armored fishlike vertebrates; taxonomy is not clear Cephalaspida , Osteostraci , suborder Cephalaspida , suborder Osteostraci
system of biological taxonomy based on the quantitative analysis of comparative data and used to reconstruct cladograms summarizing the (assumed) phylogenetic relations and evolutionary history of groups of organisms cladistic analysis , cladistics
extinct order of primitive vertebrates; the precise taxonomy is not clear; in some classifications considered a separate phylum Conodonta , Conodontophorida , order Conodonta , order Conodontophorida
extinct group of armored jawless fishes or fishlike vertebrate; taxonomy is not clear Heterostraci , suborder Heterostraci
names in taxonomy, procedure for assigning nomenclature
extinct group of armored jawless vertebrates; taxonomy is not clear order Ostracodermi , Ostracodermi
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