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Calymene tristani (1)

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  • Product Code: F22498
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Description

Origin : Morocco (Khouribga)

Geological era : Late Ordovician

Age : 450 million of years

Size : 151 gr - cm 9.4 x 5.2 x 2.7


fossil trilobite,  151 gr, cm 9.4 x 5.2 x 2.7, only a piece, as in pictures.
The specimen may have imperfections or signs of restoration.


Trilobites are marine arthropods exclusive of Paleozoic era, lived by the Lower Cambrian (520-530 moy) to the late Permian (250 moy). Their name means "three lobed", their most obvious morphological characteristic, the partition of the body into three longitudinal lobes: one axial lobe (center) and two pleural lobes (side). They are forms generally small to medium size from a few millimeters to about ten centimeters long, exceptionally up to some decimetres. Trilobites have an exoskeleton partly organic and partly composed of calcium carbonate. These animals have a head with compound eyes, a metameric segmented and articulated thorax and a rear shield pigidium. They also have a pair of jointed appendages on each segment of the body.
Up to date have been determined about 1,500 genera and 10,000 species of trilobites lived 270 million years in the overall life of this group. The trilobite are good fossil-guide, featuring a wide geographical spread, very important for the dating of the Paleozoic sedimentary rocks.
Calymene (meaning beautiful crescent as a reference to the cephalic glabella) is a genus of trilobites in the order Phacopida, suborder Calymenina, that were found throughout North America, North Africa, and Europe in primarily Silurian outcrops. This trilobite grew to a length of 9 centimeters) and fed on small edible particles in the water.



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