The first major groups of amphibians developed in the Devonian period from lobe-finned fish similar to the modern coelacanth and lungfish, which had evolved multi-jointed leg-like fins with digits that enabled them to crawl along the sea bottom.

The Devonian period experienced the first significant adaptive radiation of terrestrial life.

By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared.

The first vertebrates appeared in the form of primitive fish, which greatly diversified in the Silurian and Devonian.

The first jawed vertebrates appeared in the latest Ordovician and became common in the Devonian, often known as the " Age of Fishes ".

The Devonian also saw the rise of the first labyrinthodonts, which was a transitional between fishes and amphibians.

The first " true " seeds are described from the upper Devonian, which is probably the theater of their true first evolutionary radiation.

The first macrofossils to bear water-transport tubes in situ are the early Devonian pretracheophytes Aglaophyton and Horneophyton, which have structures very similar to the hydroids of modern mosses.

By the late Devonian, land plants had stabilized freshwater habitats, allowing the first wetland ecosystems to develop, with increasingly complex food webs that afforded new opportunities.

Originating from within the bactritoid nautiloids, the ammonoid cephalopods first appeared in the Devonian ( circa 400 million years ago ) and became extinct at the close of the Cretaceous ( 65. 5 Ma ) along with the dinosaurs.

By the early Silurian, the gills were becoming adapted for filter feeding and during the Devonian and Carboniferous periods siphons first appeared which, with the newly developed muscular foot, allowed the animals to bury themselves deep in the sediment.

The Gnathostomata first appeared in the Ordovician period and became common in the Devonian period.

The lungfish evolved the first proto-lungs and proto-limbs ; developing the ability to live outside a water environment in the middle Devonian ( 397-385 Ma ).

The first tetrapodomorphs, which included the gigantic rhizodonts, had the same general anatomy as the lungfish, who were their closest kin, but they appear not to have left their water habitat until the late Devonian epoch ( 385-359 Ma ), with the appearance of tetrapods ( four-legged vertebrates ).

The Devonian Period ( 395 to 345 Ma ) brought in the changes that allowed primitive air-breathing fish to remain on land as long as they wished, thus becoming the first terrestrial vertebrates, the amphibians.

Romer was the first to recognise the gap in the fossil record between the early land fauna of the Devonian and the later Carboniferous period, a gap that still bears the name Romer's gap.

However, Percé Rock is only a small component of the large areas of Devonian rocks that occupy the interior that were first mapped in 1844 by Sir William Edmond Logan, known as the father of Canadian geology.

The first identifiable placoderms evolved in the late Silurian ; they began a dramatic decline during the Late Devonian extinctions, and the class was entirely extinct by the end of the Devonian.

The Arthrodires include many giant members, including the earliest known " giant vertebrate ," the 2. 5 meter long Tityosteus of Early Devonian Germany, and the first vertebrate superpredators, including Dunkleosteus.

Since Alfred Eisenack first recognised and named the group in 1930, the Chitinozoa have proven incredibly useful as a stratigraphic markers in biostratigraphy during the Ordovician, Silurian and Devonian periods.

The first tillite and the first Devonian brachiopods were discovered by the expedition on this ridge, hence the name.

Pharyngeal arches appear in all tetrapod embryos: in mammals, the first pharyngeal arch develops into the lower jaw ( Meckel's cartilage ), the malleus and the stapes.

Another stage of herbivore evolution is characterized by the evolution of tetrapod herbivores, with the first appearance in the fossil record near the Permio-Carboniferous boundary approximately 300 MYA.

These fins evolved into legs of the first tetrapod land vertebrates, amphibians.

Pholcus phalangioides often uses an alternating tetrapod gait ( first right leg, then second left leg, then third right leg, etc.

Acanthostega is the first tetrapod to show the shift in locomotory dominance from the pectoral to pelvic girdle.

For many years after Romer's gap was first recognized, only two sites yielding Tournaisian-age tetrapod fossils were known: one in East Lothian, Scotland and another in Blue Beach, Nova Scotia.

In 1841, Sir William Logan, the first Director of the Geological Survey of Canada, found footprints from a tetrapod.

The Late Devonian was home to many species of Sarcopterygii | lobe-finned fish like Eusthenopteron, Panderichthys, Tiktaalik and the first tetrapod s, such as Acanthostega whose forelimbs had eight digits, and Ichthyostega which had seven.

For he knows that the first and sometimes most difficult job is to know what the question is -- that when it is accurately identified it sometimes answers itself, and that the way in which it is posed frequently shapes the answer.

This covered, wooden bridge is so closely identified with the first action in the early morning of June 3, 1861, and with subsequent troop movements of both armies in the Philippi area that it has become a part and parcel of the war story.

The radio emission of a planet was first detected in 1955, when Burke and Franklin ( 1955 ) identified the origin of interference-like radio noise on their records at about 15 meters wave length as emission from Jupiter.

Although americium was likely produced in previous nuclear experiments, it was first intentionally synthesized, isolated and identified in late autumn 1944, at the University of California, Berkeley by Glenn T. Seaborg, Leon O. Morgan, Ralph A. James, and Albert Ghiorso.

The first gene for aluminium tolerance has been identified in wheat.

Alpha particles were first described in the investigations of radioactivity by Ernest Rutherford in 1899, and by 1907 they were identified as He < sup > 2 +</ sup > ions.

Wallace did extensive fieldwork, first in the Amazon River basin and then in the Malay Archipelago, where he identified the Wallace Line that divides the Indonesian archipelago into two distinct parts, one in which animals closely related to those of Australia are common, and one in which the species are largely of Asian origin.

It is also the first known European record ( in chapter 38 ) that mentions Vinland ( Winland ) island ( insula ), a land centuries later possibly identified as Newfoundland, Canada, North America, as well as dog-headed people in Scandinavia.

The first biological clock genes, for example, were identified by examining Drosophila mutants that showed disrupted daily activity cycles.

Although very small amounts of berkelium were possibly produced in previous nuclear experiments, it was first intentionally synthesized, isolated and identified in December 1949 by Glenn T. Seaborg, Albert Ghiorso and Stanley G. Thompson.

In the narrative, just prior to this test, when Joseph had first met all of his brothers ( but not identified himself to them ), he had held a feast for them ; the narrative heavily implies that Benjamin was Joseph's favorite brother, since he is overcome with tears when he first meets Benjamin in particular, and he gives Benjamin five times as much food as he apportions to the others.

Scholars have identified several passages in Jeremiah that can be understood as “ confessions ;” they occur in the first section of the book ( chapters 1-25 ) and are 11. 18-12. 6, 15. 10-21, 17. 14-18, 18. 18-23, and 20. 7-18.

The " servant of Yahweh " can be interpreted as any of three plausible characters: the first is an individual chosen by God, like Moses, Hezekiah, Josiah, Cyrus, etc., who is identified as a messianic figure of the future.

Frank Moore Cross later proposed that an early version of the history was composed in Jerusalem in Josiah's time ( late 7th century ); this first version, Dtr1, was then revised and expanded to create a second edition, that identified by Noth, and which Cross labelled Dtr2.

Penicillinase was the first β-lactamase to be identified: It was first isolated by Abraham and Chain in 1940 from Gram-negative E. coli even before penicillin entered clinical use, but penicillinase production quickly spread to bacteria that previously did not produce it or produced it only rarely.

B. subtilis is the first bacterium for which the role of an actin-like cytoskeleton in cell shape determination and peptidoglycan synthesis was identified, and for which the entire set of peptidoglycan-synthesizing enzymes was localised.

Due to his complete independence as a filmmaker, Chaplin has been identified by Andrew Sarris as one of the first auteur filmmakers.

It can be iatrogenic .< ref name =" pmid11431283 "> It was first identified in 1996.

Curium was first intentionally produced and identified in July 1944 by the group of Glenn T. Seaborg at the University of California, Berkeley.

Mexican Americans were not identified as a racial / ethnic category prior to the 1980 US Census, when the term " Hispanic " was first used in census reports.

The first female on the channel, contrary to popular belief, was not Carol Vorderman and was a lexicographer only ever identified as Mary.

For many years, cardinal Giovanni di San Paolo ( elevated in 1193 ) was identified as member of the Colonna family and therefore its first representative in the College of Cardinals, but modern scholars have established that this was based on the false information from the beginning of 16th century.

Although he is best known for discovering the dwarf planet Pluto in 1930, the first object to be discovered in what would later be identified as the Kuiper belt, Tombaugh also discovered many asteroids ; he also called for serious scientific research of unidentified flying objects.