Ordosia
Encyclopedia
Ordosia is an extinct genus
from a well-known class of fossil
marine arthropod
s, the trilobite
s. It lived from 501 to 490 million years ago during the Dresbachian
faunal stage
of the late Cambrian Period.
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...
from a well-known class of fossil
Fossil
Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...
marine arthropod
Arthropod
An arthropod is an invertebrate animal having an exoskeleton , a segmented body, and jointed appendages. Arthropods are members of the phylum Arthropoda , and include the insects, arachnids, crustaceans, and others...
s, the trilobite
Trilobite
Trilobites are a well-known fossil group of extinct marine arthropods that form the class Trilobita. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period , and they flourished throughout the lower Paleozoic era before...
s. It lived from 501 to 490 million years ago during the Dresbachian
Dresbachian
The Dresbachian is the lower stage of the Late or Upper Cambrian Period in North America, equivalent to the Chinese Guzhangian which spans about 4 million years, from...
faunal stage
Faunal stage
In chronostratigraphy, a stage is a succession of rock strata laid down in a single age on the geologic timescale, which usually represents millions of years of deposition. A given stage of rock and the corresponding age of time will by convention have the same name, and the same boundaries.Rock...
of the late Cambrian Period.