A new species of large predatory fish named Laccognathus embryi that prowled ancient North American waterways during the Devonian Period, before backboned animals existed on land, has been announced.

The Devonian Period (415 to 360 million years ago) is often described as the Age of Fishes because of the rich variety of aquatic forms that populated the ancient seas, lagoons and streams. Laccognathus embryi is a lobe-finned fish whose closest living relative is the lungfish. The creature probably grew to about 5 or 6 feet long and had a wide head with small eyes and robust jaws lined with large piercing teeth.

The 375-million-year-old beast was discovered by the same group of researchers who discovered Tiktaalik roseae, the important transitional animal considered "a missing link" between fish and the earliest limbed animals. The fossil remains of the new species were found at the same site as Tiktaalik, on Ellesmere Island in the remote Nunavut Territory of Arctic Canada.

This is a photograph and line drawing of the skull of Laccognathus embryi, a new species of predatory fish from the Devonian Period. Note the wide head, large mouth and small area for the eyes. Individual bones labeled on line drawing. Credit: Ted Daeschler/ANSP

"I wouldn't want to be wading or swimming in waters where this animal lurked," said Dr. Edward "Ted" Daeschler , co-author of the paper and the Academy of Natural Science's curator of vertebrate zoology. "Clearly these Late Devonian ecosystems were vicious places, and Laccognathus filled the niche of a large, bottom-dwelling, sit-and-wait predator with a powerful bite." 

The kind of fish known as Laccognathus (translates as pitted jaw) was previously only known from Eastern Europe. The discovery of Laccognathus embryi, the new species, extends the geographic range of Laccognathus to North America and confirms direct connection of the North American and European landmasses during the Devonian Period.

This is an artist's rendering of Laccognathus embryi in its habitat during the Devonian Period. Although the fossils were discovered in the Canadian Arctic, the conditions when Laccognathus lived were subtropical. Credit: Jason Poole/ANSP

"This study is the culmination of a lot of work in the field, in the fossil lab, and in the office," said
Dr. Jason Downs , lead author of the study. Downs, an Academy research associate and a visiting professor at Swarthmore College, started studying fossils in high school as an Academy volunteer. "Our team collected the first fossils of Laccognathus almost 10 years ago, and the collection has grown with each subsequent field season. The quality and quantity of this collection will continue to shed new light on these unusual animals."

 The researchers named the new species 
Laccognathus embryi in honor of Dr. Ashton Embry, a Canadian geologist whose work in the Arctic islands paved the way for the authors' paleontological explorations.

Laccognathus embryi was published in the current issue of the Journal of Vertebrate Paleontology.