Iapetognathus fluctivagus

Iapetognathus fluctivagus is a tiny, ancient creature called a conodont. It belonged to a group known as denticulate cordylodan and lived during the Tremadocian Age, about 486.85 million years ago in the Ordovician.

This tiny creature is important for scientists who study Earth's history. It is used as an index fossil, which helps scientists figure out the age of rocks where it is found. By looking at where Iapetognathus fluctivagus appears, experts can learn more about when different layers of Earth’s surface were formed, a field called biostratigraphy.

Because it lived so long ago, Iapetognathus fluctivagus gives us a glimpse into life from over 480 million years ago, helping us understand how life on our planet has changed through time.

Description

Like other members of its group, Iapetognathus fluctivagus had a branching set of parts. Scientists believe this branching shape came from a cone-like form seen in Iapetonudus ibexensis. This species is different from others from the same time because its main tooth-like parts point to the sides.

Taxonomy

Iapetognathus fluctivagus is a member of the genus Iapetognathus. It belongs to the cordylodan family Cordylodontidae, which is part of the order Proconodontida. Scientists first described this species in 1999. The researchers who named it were paleontologists Robert S. Nicoll, James F. Miller, Godfrey S. Nowlan, John E. Repetski, and Raymond L. Ethington.

Distribution

The fossils of Iapetognathus fluctivagus have been found in many places. These include parts of the United States such as Utah, Nevada, Idaho, Colorado, Oklahoma, Texas, and New Mexico. Fossils have also been found in western Newfoundland and British Columbia in Canada, as well as in Bartyrbay of Kazakhstan and the Hebei province of China.

Biostratigraphy

Scientists first found Iapetognathus fluctivagus in the cliffs of Green Point, Newfoundland and Labrador, Canada. This discovery marks the start of the Tremadocian Age, which was 486.85 million years ago, and the beginning of the Ordovician Period.

Scientists are still learning more about Iapetognathus and similar groups. In 2011, they found that Iapetognathus fluctivagus might not be the earliest of its kind. Another species, Iapetognathus preaengensis, appeared before it. Because of this, scientists suggested looking again at the Green Point area and possibly using other index fossils to better understand these time periods.