Obtaining high-quality images of Limulidae in amphibious environments is a challenging task due to insufficient light and the complex optical properties of water, such as light absorption and ...

Life on Earth has existed for over 3.5 billion years, evolving into a vast array of species. Some animals, however, have survived virtually unchanged for hundreds of millions of years, making them ...

Ancient environmental DNA from northern Greenland opens a new chapter in genetic research, demonstrating that it is possible to track the ecology and evolution of biological communities two million ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This object is part of the Education ...

Horseshoe crabs are incredibly old. First up on our list of horseshoe facts is a fact that almost defies belief. Horseshoe crabs are one of the most ancient life forms on the planet. They are “living ...

A line drawing of the Internet Archive headquarters building façade. An illustration of a magnifying glass. An illustration of a magnifying glass.

The primary differences between trilobites and horseshoe crabs are their current extinction status, their exoskeleton, and their evolutionary history. Trilobites are some of the oldest creatures to ...

The eyes of the extinct sea scorpion Jaekelopterus rhenaniae have the same structure as the eyes of modern horseshoe crabs (Limulidae). The compound eyes of the giant predator exhibited lens cylinders ...

The extinct sea scorpion species Jaekelopterus rhenaniae had eyes comparable to those of today's horseshoe crabs. The two-and-a-half-meter predator was particularly apt at perceiving contrasts and ...

Horseshoe crabs have weird blood, mate en masse in May and June, and harbor a secret weapon that’s probably saved your life. Here are some more facts about these ancient arthropods. In fact, they aren ...