Apatolichas
Encyclopedia
is an extinct genus
from a well-known class of fossil
marine arthropod
s, the trilobite
s. It lived during the later part of the Arenig stage
of the Ordovician Period, approximately 478 to 471 million years ago.
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 during the later part of the Arenig stage
Arenig
In geology, the Arenigian refers both to a time interval during the Lower Ordovician period and also to the suite of rocks which were deposited during this interval.-History:...
of the Ordovician Period, approximately 478 to 471 million years ago.