Fossils from 465 million years ago recently discovered in Portugal have revealed the huge size reached by trilobites, the most diverse group of extinct marine arthropods. Geologists describe the ...

Memoir (The Paleontological Society), Vol. 40, Supplement to Vol. 69, no. 3 of the Journal of Paleontology (May, 1995), pp. 1-23 (25 pages) Review of collections in Prague and at Harvard University, ...

Journal of Paleontology, Vol. 71, No. 5 (Sep., 1997), pp. 862-877 (16 pages) Hystricurids are considered to constitute the earliest (early Ibexian or Tremadocian) family of Proetida, based on ...

Fig.1: Tempo and mode in the body size evolution of Cambrian-Ordovician trilobites. Changes in maximum size (red) and mean size (blue) for each time slice, with lines and shading representing the mean ...

Trilobites may have grown in a similar fashion and reached ages that match those of extant crustaceans, a new study has found. Trilobites -- extinct marine arthropods that roamed the world's oceans ...

Fig. 4: Cambrian and Ordovician trilobite body size (A) and their correlation to the inferred oxygen levels (B) and temperature (C). (B) Ocean redox conditions and widespread anoxic intervals, showing ...

The trilobites go marching one by one, hurrah, hurrah … well, at least they did, some 480 million years ago. New fossils from Morocco show lines of trilobites in orderly queues, likely buried by a ...

Rachael has a degree in Zoology from the University of Southampton, and specializes in animal behavior, evolution, palaeontology, and the environment.View full profile Rachael has a degree in Zoology ...

A team of researchers — including one from Texas State University in San Marcos — have discovered 10 new species of an extinct marine creature, a finding that scientists say could help piece together ...

Waiting in line may feel like one of the more primitive aspects of modern life; think of all those people lined up for the latest iPhone, concert tickets or a trendy pastry. But following the leader ...

The “king” of the trilobites was snacking on whatever it could eat some 514 million years ago in the Cambrian era, even shelled creatures of its own species. By Rebecca Dzombak Cannibalism is common ...