Among invertebrates, research on body size evolution has been limited to a few groups, such as brachiopods and insects. The early Paleozoic is an ideal period for testing the relative importance ...

These included brachiopods, which lived in shells resembling those of clams or cockles, and animals with jointed, external skeletons known as arthropods—the ancestors of insects, spiders ...

Early animals like trilobites and brachiopods developed hard exoskeletons, which allowed them to thrive in various marine environments. The fossilization of these hard parts has provided ...

In 2015, the scientific world was stunned when researchers announced the discovery of a fossilized snake with four legs. Named Tetrapodophis amplectus (meaning “four-legged hugging snake”), this ...

They contain hemocyanin, a copper-based molecule that turns blue when oxygenated, so that’s why they have blue blood. Some species of Lizards, such as skinks, contain green blood due to a pigment ...

Two different types of periostraca have been found in living articulate brachiopods. These two types can be correlated to give some indication of the structure of the prototypic shell.

Derbyshire holds a wealth of small fossils, most commonly brachiopods and crinoids, as they once populated the reeds that now are the limestone cliffs for which that area is known. The tropical ...

That’s a far way back. But it’s not Swatara State Park brachiopod far back. Visitors to the park in Lebanon and Schuylkill counties explore a fossil pit just off Bear Hole Trail and reasonably expect ...

Texas’s Guadalupe Mountains were once an ancient reef on the edge of a shallow sea. Now they form some of the highest and most fossil-rich peaks in the state, offering a rare look into a prehistoric ...

Photo Credit: Kelly F Fossil hunters might spot crinoids, brachiopods, and other marine fossils embedded in the sandstone – tangible connections to a time when this landlocked state was beneath an ...