Facts about Trilobites
- 09
Enrolled trilobites from the Silurian period show evidence of complex social behavior through clustered fossils, suggesting these creatures may have gathered in groups for mating or migration purposes.
- 08
Specialized sensory antennae on trilobites detected chemical signals and vibrations in Paleozoic seawater, enabling them to locate food and mates across distances of several meters.
- 07
Trilobite fossils from the Cambrian period show evidence of predation marks and injuries that healed during their lifetime, indicating active predator-prey relationships existed over 500 million years ago.
- 06
Trilobite appendages beneath their exoskeleton included biramous limbs with both walking and swimming functions, enabling these arthropods to exploit multiple ecological niches across Paleozoic oceans.
- 05
Trilobite molting left behind cast exoskeletons that accumulated in layers, creating some of the most abundant fossils in Paleozoic rock formations worldwide.
- 04
Some trilobite species reached lengths of 28 inches, making Isotelus rex one of the largest arthropods ever to inhabit Earth's oceans.
- 03
Trilobites could curl into a protective ball by rolling their segmented exoskeleton, a defensive mechanism preserved in fossils from as far back as the Ordovician period.
- 02
Compound eyes with thousands of individual lenses allowed trilobites to see in multiple directions simultaneously, a visual advantage unmatched by most contemporary organisms.
- 01
Over 20,000 species of trilobites existed during their 270-million-year reign from the Cambrian through Permian periods.