Sentences with phrase «placoderm dunkleosteus»

Fossils inlaid within the rocks in the Cliff area hint at previous inhabitants of the island, consisting of enormous trilobite lookalikes, gastropods, placoderm fish, and eurypterids as well.

«We are quite sure that the juvenile - only placoderm assemblage is not the result of sorting of small material by water currents because there are larger skeletal elements of other kinds of fish.

At the same time, larger placoderm fossils, indicating mature fish, were not found.

With three different types of placoderm fossils discovered at Strud — Grossilepis rikiki, Turrisaspis strudensis and Phyllolepis undulata — it opens a question for scientists like Daeschler.

Daeschler and Olive's work focused largely on comparing the Red Hill site to Strud, noting many similarities between the two and using the size and shape of placoderm fossils from Red Hill, housed at the Academy of Natural Sciences, to establish the relative maturity of samples found in Strud.

Ahlberg found that each placoderm also had two pairs of muscles reaching from its shoulder girdle to the top of its head.

As the placoderm swam, waving its tail from side to side, the back half of its body would have swung from side to side as well.

Using fragments from three placoderm fossils, Ahlberg was able to piece together some of their musculature.

The fossil fish Tiktaalik, discovered in 2006, dates back to the same period, and its skeleton bears many more similarities to tetrapods than to the placoderms described in Long's article — including homologous arm bones and shoulder, neck and ear features.

Before the extinction, fish were dominated by two groups: the armor - plated, predatory placoderms and the lobe - finned fish, whose fins are borne on a fleshy, scaly stalk extending from the body.

This backs up a 2013 study that showed that several traits thought to be unique to bony fish, such as the presence of large platelike bones, were in fact present in placoderms, an extinct group of jawed fish related to the ancestor of both cartilaginous and bony fish.

Nobody knows why the placoderms had abdominal muscles like these.

The big surprise was in the placoderms» abdominal muscles.

Some had well - known cousins on other continents, for example, the extinct armoured fish called placoderms, the massive sauropod dinosaurs and the armoured ankylosaurs.

Although placoderms are long extinct, getting glimpses of their lives puts more pieces together in the evolutionary puzzle.

Dunkleosteus grew up to 33 feet long and was the largest of a group of armor - plated predatory fish, the placoderms.

A quarry in Strud, Belgium, that was excavated between 2004 and 2015 yielded fossils of multiple species of placoderms, which are extinct, armored fish that represent some of the earliest jawed vertebrates on Earth.

The top ocean predator of the time, its prey could have included early sharks, large nautiluslike mollusks, arthropods and other placoderms, Westneat says.

«In the case of placoderms like these, we're looking at some of the earliest jawed vertebrates,» Olive said.

Correction (10/28/15): An earlier mention of placoderms has been removed to reflect the general consensus that this fish had likely gone extinct prior to the Permian period.

An ichthyologist specializing in placoderms, or armored fish, Dean was also an enthusiastic collector of armor.