What was the arthropod in 470 million years ago?

Around 470 million years ago, during the Ordovician period, arthropods were among the dominant marine organisms. This era saw the emergence of early forms of trilobites, which were abundant and diverse, showcasing a variety of shapes and sizes. Other arthropods, such as primitive crustaceans and possibly the first arachnids, also began to appear during this time, marking significant evolutionary advancements in this phylum. These creatures played a crucial role in the marine ecosystems of the period.