Horseshoe crabs are an ancient lineage with an evolutionary history stretching back 450 million years (Ordovician period) and are generally considered...
Trilobites were a diverse group of ancient marine arthropods. Many trilobites lived on the seafloor but some occupied open water. New research has resolved...
A paleontologist at the University of Leicester has described a new genus and species of enigmatic multisegmented arthropod using a fossilized specimen...
A new species of megacheiran arthropod from the Ordovician period, preserved in 3D by pyrite (commonly known as fool’s gold), has been discovered by...
Breakup of an asteroid passing within Earth’s Roche limit likely formed the debris ring during the middle Ordovician period, according to new research...
Based on multiple analytical techniques applied to well-preserved soft-bodied specimens of two trilobite species, the Late Ordovician species Triarthrus...
Sea scorpions (eurypterids), extinct giant aquatic arthropods, were apex predators. New research suggests that early species of the scorpion-like carcinosomatoid...
Euchelicerata is a large group of arthropods comprising horseshoe crabs, scorpions, spiders, mites and ticks, as well as the extinct sea scorpions and...
In a new paper in the journal Nature Ecology & Evolution, paleontologists described the diversity of the Cabrières Biota, a new Early Ordovician site...
Pterygotid eurypterids (sea scorpions), giant aquatic arthropods with big claws, were all regarded as apex predators but some scientists then suggested...
In a 100-page monograph published in the journal Papers in Palaeontology, paleontologists have described ten new species of trilobites from the tuff-bearing...
In the search for life in the Universe, Earth provides a template of evolution for the one habitable planet we know. Earth’s atmospheric composition...
The newly-discovered fossilized specimen of Bohemolichas incola, a species of trilobite that lived during the Ordovician period, provides by far the most...
Archopterus anjiensis, a new 445-million-year-old fossil sea scorpion, from the Chinese Zhejiang Province, is the oldest sea scorpion known from China.
Life...
The highly-diverse Middle Ordovician fossil site at Castle Bank, Wales, is directly comparable with the famous Burgess Shale and Chengjiang biotas in paleoenvironment...
Palmichnium gallowayi, a 460-million-year-old fossil trackway of a sea scorpion, from upstate New York, is one of the earliest signs of animal life on...
Two specimens of euarthropods from the Middle Ordovician Castle Bank Biota in Wales, the United Kingdom, have striking similarities to Opabinia, an iconic...
Horseshoe crabs, or xiphosurans, are an order of marine and brackish water arthropods. Despite their common name, they are not really crabs, and are more...
The end-Ordovician mass extinction, the first of the ‘Big Five’ mass extinctions occurred 445 million years ago and was characterized by the disappearance...
