Where is Calymene found?
Where is Calymene found?
Calymene (meaning beautiful crescent as a reference to the glabella) is a genus of trilobites in the order Phacopida that are found throughout North America, North Africa, and Europe in primarily Silurian outcrops.
Is Calymene extinct?
Calymene, genus of trilobites (extinct arthropods) dating from the Ordovician Period (505 to 438 million years ago).
Who discovered Calymene?
Brongniart
As Brünnich (1781), Brongniart placed the descriptions and figures of his genus Calymene along with its type species blumenbachii at the beginning of his systematic section (Fig. 5); this made Calymene the first and oldest genus of modern trilobite systematics.
When did the Calymene Celebra live?
about 430 million years ago
During the Silurian period, about 430 million years ago much of Wisconsin was covered by a large, shallow sea. This ancient sea was home to many types of corals, brachiopods, crinoids and trilobites. The most abundant of the trilobites was a species known as Calymene celebra.
What is Wisconsin’s state fossil?
Trilobites Calymene celebra
Trilobites. Calymene celebra trilobite found in the UW Geology Museum, Madison, WI. The trilobite Calymene celebra is Wisconsin’s state fossil.
How are trilobite fossils preserved?
Complete trilobite skeletons are relatively rare, and were probably preserved when the sea floor was buried by mud during major storms. Normally, the membranes that hold the skeleton together will decay and the skeleton will fall apart. The various pieces will be scattered by waves, currents or scavenging animals.
What are the characteristics of a trilobite?
The trilobite body was segmented and divided into three regions from head to tail: the cephalon, or head region, separated from the thorax, which was followed in turn by the pygidium, or tail region. Trilobites, like other arthropods, had an external skeleton, called exoskeleton, composed of chitinous material.
What kind of organism is trilobite?
The animal. Like many invertebrate animals living today, including crustaceans, spiders and insects, trilobites were arthropods, belonging to the phylum Arthropoda. Geologists know that they were marine animals because of the rocks in which they are found and the other types of fossils associated with them.
