Description: Click to Find Other Rocks, Fossils & Minerals Items Natural Phacops Trilobite Fossil Specimen on Matrix Rock Decorative Fossilized Mineral Devonian Period Stone - Morocco You will receive exactly this Phacops Trilobite Fossil on Matrix (see photo, the photos are taken under bright light, stand not included)! Trilobites are a well-known fossil group of extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period (521 million years ago), and they flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Devonian, all trilobite orders except Proetida died out. Trilobites finally disappeared in the mass extinction at the end of the Permian about 250 million years ago. The trilobites were among the most successful of all early animals, roaming the oceans for over 270 million years. Trilobites were among the early arthropods, a phylum of hard-shelled creatures with multiple body segments and jointed legs. The smallest known trilobite species is under a millimeter long, while the largest include species from 30 to over 70 cm in length. Most trilobites are about an inch long, and part of their appeal is that you can hold and examine an entire fossil animal and turn it about in your hand. Whatever their size, all trilobite fossils have a similar body plan, being made up of three main body parts: a cephalon (head), a segmented thorax, and a pygidium (tail piece). Phacops is a genus of trilobites in the order Phacopida, family Phacopidae, that lived in Europe, northwestern Africa, North and South America and China from the Early until the very end of the Devonian, with a broader time range described from the Late Ordovician. It was a rounded animal, with a globose head and large eyes, and probably fed on detritus. Phacops is often found rolled up, a biological defense mechanism that is widespread among smaller trilobites but further perfected in this genus. Like in all sighted Phacopina, the eyes of Phacops are compounded of very large, separately set lenses without a common cornea (so called schizochroal eyes), and like almost all other Phacopina, the articulate mid-length part of the body (or thorax) in Phacops has 11 segments. However, the name "trilobite", which means "three lobed," is not in reference to those three body parts mentioned above, but to the fact that all trilobites bear a long central axial lobe, flanked on each side by right and left pleural lobes. Each trilobite body segment bore a pair of jointed appendages. The forwardmost appendages were modified into sense and feeding organs. Most trilobites had a pair of compound eyes; some of them, however, were eyeless. By the time trilobites first appeared in the fossil record they were already highly diversified and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton an extensive fossil record was left behind, with some 17,000 known species spanning Paleozoic time. The study of these fossils has facilitated important contributions to biostratigraphy, paleontology, evolutionary biology and plate tectonics. Trilobites are often placed within the arthropod subphylum Schizoramia within the superclass Arachnomorpha (equivalent to the Arachnata), although several alternative taxonomies are found in the literature. Trilobites burst into amazingly diversity in the fossil record within some five million years of the base of the Cambrian. Such diversity is evidence that trilobites had a past dating long before this famous period and its apparent explosion of life known as the Cambrian Explosion, what made them seem new was that they had acquired a readily preserved skeleton, one they had to be shed to grow. They were detritivores, predators, and scavengers, and evolved stealthy and defensive phenotypic characteristics in order to survive in an evolutionary arms race between predator and prey. Among the Cambrian fauna, the crystal eyes of trilobites are unique. In the eyes is a strong clue of their ancestry in deep time of the Precambrian, since the fossil record indicates pre-sight neural tissue existed in forms of worms that also contain segmented morphology retained in the trilobite body plan.Trilobites appear to have been exclusively marine organisms, since the fossilized remains of trilobites are always found in rocks containing fossils of other salt-water animals such as brachiopods, crinoids, and corals. Within the marine paleoenvironment, trilobites were found in a broad range from extremely shallow water to very deep water. Trilobites radiated into the most diverse class of extinct creatures during the Paleozoic, but the Cambrian marked their middle age, not their beginnings. Their size ranged from less than a mm to over one meter in length. The made their living in diverse ways, some crawling, some swimming. Trilobites, like brachiopods, crinoids, and corals, are found on all modern continents, and occupied every ancient ocean from which Paleozoic fossils have been collected. The remnants of trilobites can range from the preserved body to pieces of the exoskeleton, which it sheds in the process known as ecdysis. In addition, the tracks left behind by trilobites living on the sea floor are often preserved as trace fossils.Trilobite fossils are found worldwide, with many thousands of known species. Because they appeared quickly in geological time, and moulted like other arthropods, trilobites serve as excellent index fossils, enabling geologists to date the age of the rocks in which they are found. They were among the first fossils to attract widespread attention, and new species are being discovered every year.(The above information is provided solely for informational purpose. Kindly note that all stones are offered for decorative purposes only. Please, handle your stones with great care, do not grind or crumble them, do not dip or add them into your food or drink, do not use any parts of them in any elixirs, potions, lotions etc. Always make sure you wash your hands before and after working with your crystals.) Our aim is to provide the best service to our clients. We want to provide you with Five star service at every point of the Detailed Seller Ratings. 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Price: 18.36 USD
Location: Harrison, New Jersey
End Time: 2024-08-13T16:37:29.000Z
Shipping Cost: 3.95 USD
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Item Specifics
Return shipping will be paid by: Seller
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
Return policy details:
Weight: 20g / 0.71 oz / 100 Carat
Type: Trilobite
Country/Region of Manufacture: Morocco
California Prop 65 Warning: This product may expose you to chemicals known to the State of California to cause: WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov
Size: 41 x 33 x 20mm / 1 5/8 x 1 5/16 x 13/16 Inches;
