Location : Hamar Laghdad Formation, Djebel Issoumour, Alnif, Morocco. Approximate Size : 15.0 x 14.8 x 5.5 cm. Meaning large or great, and µa?? Meaning madness, frenzy is a species of trilobite from the order Phacopida that lived in the devonian.
It is found in Jbel Issoumour, Morocco. It has fairly large schizochroal eyes which were mounted on turret-like structures that gave the animal a near 360-degree field of view. It has the habit of rolling up into a ball to protect itself from the predators with its hard exoskeleton.
The entire trilobite is exposed, shown in its partly enrolled position with some of the original limestone in which it was fossilized in. Nice natural color of the trilobite contrasts beautifully with the reminent lighter grey limestone rock that it was exposed from. Trilobites were marine arthopods, from the group Trilobita, with more than 10 thousand species some growing to 2 metres.
The group Trilobita appeared in the Cambrian Period (520 million years ago) until the end of the Permian Period (250 million years ago). The name Trilobita is derived from the three (tri-) lobed structure of the exoskeleton, which has a raised central lobe (or axis) and a pair of side lobes, called pleurae. The trilobite body is also divided lengthwise into three regions : a head or cephalon, a middle region (thorax) composed of several to many articulated segments, and a tail plate called a pygidium, which consists of fused segments.
Arthropods are the most species-rich animal phylum living today, and have been the most diverse group of multicellular animals since the Early Cambrian. Their main subgroups are the crustaceans (like prawns and crabs), the chelicerates (including spiders, scorpions, and mites), and the wholly terrestrial groups Insecta and Myriapoda (the latter including millipedes and centipedes). This item is in the category "Collectables\Rocks, Fossils, Minerals\Fossils".
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