EVOLUCION TRILOBITES PDF

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: The middle Cambrian trilobites found in the locality of Purujosa as well as other localities from the Iberian Chains such as Murero and Mesones Zaragoza show a large number of new enrolment devices as well as high variability of enrolment types ever describe in Cambrian times, they show that enrolment was a very spread behavior in Cambrian times.

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Euarthropoda, the animal group including crustaceans, insects, and a wide diversity of extinct groups, all share a hard exoskeleton that functions as protection against predation and parasitism.

However, this exoskeleton restricts growth of the individual and, therefore, must be periodically shed moulted to facilitate development. Trilobites, one of the most abundant groups ever to have lived, had heavily reinforced exoskeletons, which are therefore found preserved as fossils in great number.

Empty moulted trilobite exoskeletons are common in the fossil record, and these can be used to interpret their behaviours relating to how they may have moulted. The results show that trilobite moulting behaviour was particularly variable in comparison to other euarthropod groups, often differing both between individuals of the same species and of different species. The longest-lived trilobite group showed the lowest levels of variability, and the highest levels of variability were found in the earliest period of trilobite evolution.

Ultimately, this study demonstrates that behaviours like moulting, which affect the broad evolutionary history of animal groups, can undergo quantitative study using the fossil record. Article Search Search Quantifying intra- and interspecific variability in trilobite moulting behaviour across the Palaeozoic Harriet B.

Drage Plain Language Abstract Euarthropoda, the animal group including crustaceans, insects, and a wide diversity of extinct groups, all share a hard exoskeleton that functions as protection against predation and parasitism.

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