trilobite

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trilobite

a fossil arthropod of the class Trilobita from the CAMBRIAN and SILURIAN PERIODS.
References in periodicals archive ?
'The general view has been that trilobites had lenses made from single calcium carbonate crystals.
In the sea, trilobites that had survived the last two wipeouts finally succumbed, along with some sharks and bony fishes.
The phacopide trilobites are relatively common in the Sarcheshmeh Member (the uppermost Devonian unit of the Khoshyeilaq Formation) exposed in the eastern Alborz Mountains along the road connecting Shahrud and Azadshahr.
"Typically when we look at fossils of trilobites, they molt [much like modern-day lobsters] when they grow," Sumrall added.
* Lisa collects (right) and studies trilobites to learn how they adapted--or not--to changing environmental conditions.
from the mind leaving its trilobites, its fossil signatures.
Monomorphichnus has typically been interpreted as having been produced by trilobites, some of the earliest interpretations suggesting that they are grazing traces recording trilobites that made scratch impressions on a channel bed as they were carried along in a current (Crimes 1970; Fillion and Pickerill 1990).
* Ordovician extinction - It was a time when the earth was dominated by sea creatures such as trilobites, brachiopods and graptolites.
Ordovician Trilobites of Southern Ontario, Canada and the Surrounding Region
Cruziana is interpreted as the feeding trace of trilobites and/or other arthropods such as aglaspids, limulids or phyllopods, whereas C.
Some trilobites scurrying across the seafloor around 500 million years ago had two-lane digestive tracts.
Other pages feature an Anatolian rug, a large medallion, a Roman helmet, a Greek sculpture of a young Bacchus, the vertebrate of a Mesozoic crocodile, and several specimens of Trilobites. There's even a page paying tribute to the Duchess of Connaught who was experiencing serious health issues (she died three years later).