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Trilobites sp. (3) (plexi)

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Description

Origin : Morocco (Issoumar, Alnif)

Geological era : Middle Devonian

Age : 390 million of years

Size : mm 7 x 6 x 6


fossil trilobite, not identified (presumable species Acaste sp., Metacanthina sp. etc.), mm 7 x 6 x 6, fixed with plasticine in plaxiglas box (mm 23 x 23 x 18), only a piece, as in pictures.

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.
Acaste is a genus of extinct trilobite of the order Phacopida which lived throughout the Silurian period. They are characterized by a convex dorsal surface, an absence of spines, a shortening of the head-shield and a general rounding off of all angles.
The Known species are:
A. birminghamensis = Llandovacaste birminghamensis
A. constrictus = Acastoides constricta
A. cordobesa = Pennaia verneuili
A. henni = Acastoides henni
A. verneuili = Calmonia terrarocenai

Some species originally designated to Acaste have now been reassigned to other genera.

f you want to collect your fossils in this way, you can find in our catalog equipment plasticine, cardboard containers and various transparent plexiglas boxes.



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