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Human taxonomy is the classification of the human species systematic name Homo sapiens , Latin : "wise man" within zoological taxonomy. The systematic genus , Homo , is designed to include both anatomically modern humans and extinct varieties of archaic humans. Current humans have been designated as subspecies Homo sapiens , differentiated according to some from the direct ancestor, Homo sapiens idaltu with some other research instead classifying idaltu and current humans as belonging to the same subspecies   . Since the introduction of systematic names in the 18th century, knowledge of human evolution has increased drastically, and a number of intermediate taxa have been proposed in the 20th and early 21st centuries. The most widely accepted taxonomy grouping takes the genus Homo as originating between two and three million years ago, divided into at least two species, archaic Homo erectus and modern Homo sapiens , with about a dozen further suggestions for species without universal recognition.
What Is Radiometric Dating Method
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Kimberella is an extinct genus of bilaterian known only from rocks of the Ediacaran period. The slug-like organism fed by scratching the microbial surface on which it dwelt in a manner similar to the gastropods , although its affinity with this group is contentious. Paleontologists initially classified Kimberella as a type of jellyfish , but since features of its anatomy and its association with scratch marks resembling those made by a radula have been interpreted as signs that it may have been a mollusc. Although some paleontologists dispute its classification as a mollusc, it is generally accepted as being at least a bilaterian. Even if it was a bilaterian but not a mollusc, its age would indicate that animals were diversifying well before the start of the Cambrian.