Devonian animals hi-res stock photography and images

Devonian Animals - A collection of various aquatic animals that lived during the Devonian Period of Earth's history. Stock Photo

RFHNBT44–Devonian Animals - A collection of various aquatic animals that lived during the Devonian Period of Earth's history.

Palaeozoology - Devonian period - Tetrapods and extinct fishes - Ichthyostega e Eusthenopteron - Art work by Steve Roberts Stock Photo

RMF02F4C–Palaeozoology - Devonian period - Tetrapods and extinct fishes - Ichthyostega e Eusthenopteron - Art work by Steve Roberts

A collection of various animals and fish that lived in the Devonian Period of Earth's history. Stock Photo

RF2GP4JET–A collection of various animals and fish that lived in the Devonian Period of Earth's history.

Cephalaspis lyelli jawless fish from the Early Devonian of Scotland Stock Photo

RFHG64X5–Cephalaspis lyelli jawless fish from the Early Devonian of Scotland

Petrified animals found in the Silurian and Devonian System, found in the layers of earth Stock Photo

RM2Y463EP–Petrified animals found in the Silurian and Devonian System, found in the layers of earth

Geisonoceras (Orthoceras) Fossil, Devonian, Morocco Stock Photo

RMMFENME–Geisonoceras (Orthoceras) Fossil, Devonian, Morocco

Artist rendering of the Lungfish(dipnoan) - Devonian period Stock Photo

RMBTBFFF–Artist rendering of the Lungfish(dipnoan) - Devonian period

Dinichthys herzeri, extinct, giant, marine arthrodire placoderm from the Late Devonian. Riesenfisch, Dinichthys. Colour printed illustration by F. John from Wilhelm Bolsche’s Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908. Stock Photo

RM2DRJ9TY–Dinichthys herzeri, extinct, giant, marine arthrodire placoderm from the Late Devonian. Riesenfisch, Dinichthys. Colour printed illustration by F. John from Wilhelm Bolsche’s Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908.

RMHRP5X0–Devonian Period

Asterolepis cornutus, extinct species of armour-plated fish, antiarch placoderm of the Devonian. Flugelfisch (Pterichthys cornutus Agassiz). Colour printed illustration by F. John from Wilhelm Bolsche’s Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908. Stock Photo

RM2H58X3C–Asterolepis cornutus, extinct species of armour-plated fish, antiarch placoderm of the Devonian. Flugelfisch (Pterichthys cornutus Agassiz). Colour printed illustration by F. John from Wilhelm Bolsche’s Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908.

Ammonites lacunatus, Print, Ammonoidea, Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out in the Cretaceous–Paleogene extinction event Stock Photo

RM2A2KYTC–Ammonites lacunatus, Print, Ammonoidea, Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out in the Cretaceous–Paleogene extinction event

Reconstruction of a Dinichthys catching a wave. Extinct monospecific genus of giant, marine arthrodire placoderm from the Late Devonian (Famennian stage). Dinichthys herzeri. Colour printed illustration by F. John from Wilhelm Bolsche’s Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908. Stock Photo

RM2JG3EMA–Reconstruction of a Dinichthys catching a wave. Extinct monospecific genus of giant, marine arthrodire placoderm from the Late Devonian (Famennian stage). Dinichthys herzeri. Colour printed illustration by F. John from Wilhelm Bolsche’s Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908.

RMEX6NC5–Crossopterygians:

Helicoprion bessonowi, shark-like eugeneodontid holocephalid fish with tooth whorl from the Permian, and prehistoric prickly shark species Xenacanthus decheni of the Devonian and Triassic. Spiralhai, Helicoprion, und Stachelhai, Xenacanthus. Colour printed illustration by F. John from Wilhelm Bolsche’s Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908. Stock Photo

RM2DRJ9TE–Helicoprion bessonowi, shark-like eugeneodontid holocephalid fish with tooth whorl from the Permian, and prehistoric prickly shark species Xenacanthus decheni of the Devonian and Triassic. Spiralhai, Helicoprion, und Stachelhai, Xenacanthus. Colour printed illustration by F. John from Wilhelm Bolsche’s Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908.

DEVONIAN FOSSIL: Brachiopod spiralia Ammonite Trilobite Gasteropod Mollusc, 1907 Stock Photo

RFG3PEYT–DEVONIAN FOSSIL: Brachiopod spiralia Ammonite Trilobite Gasteropod Mollusc, 1907

The Late Devonian monster Dunkleosteus (by Schleich, 2015) terrorized the ancient world's oceans 385 to 359 million years ago Stock Photo

RF2T4WA29–The Late Devonian monster Dunkleosteus (by Schleich, 2015) terrorized the ancient world's oceans 385 to 359 million years ago

Fauna of the Devonian period. Publication of the book 'Meyers Konversations-Lexikon', Volume 2, Leipzig, Germany, 1910 Stock Photo

RF2JBP2X7–Fauna of the Devonian period. Publication of the book 'Meyers Konversations-Lexikon', Volume 2, Leipzig, Germany, 1910

Trilobite Asaphus sp., South Morocco, Africa, Devonian Stock Photo

RM2AEJYRX–Trilobite Asaphus sp., South Morocco, Africa, Devonian

RM2T6CNW4–Dinichthys herzeri, extinct, giant, marine arthrodire placoderm from the Late Devonian. Riesenfisch, Dinichthys. Colour printed illustration by F. John from Wilhelm Bolsches Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908.

Fossil Trilobites, (Phacops or Eldredgeops rana), Devonian, Ontario. Stock Photo

RMC09CMJ–Fossil Trilobites, (Phacops or Eldredgeops rana), Devonian, Ontario.

Palaeozoology - Devonian period - Fossil fishes - Placodermi - Dunkleosteus during the predation - Art work Stock Photo

RMF02F2T–Palaeozoology - Devonian period - Fossil fishes - Placodermi - Dunkleosteus during the predation - Art work

Dipterus Fossil Fish, Tynet Burn, Banff, Scotland Devonian Period Stock Photo

RMDWBW90–Dipterus Fossil Fish, Tynet Burn, Banff, Scotland Devonian Period

Gyroptychius (Gyroptychius agassizii), fossilised Gyroptychius from Middle Devonian, United Kingdom, Scotland Stock Photo

RMEBN2MM–Gyroptychius (Gyroptychius agassizii), fossilised Gyroptychius from Middle Devonian, United Kingdom, Scotland

Model of Cheirolepis trailli, An Extinct Ray-finned Fish That Lived In The Devonian Period Of Europe and North America Stock Photo

RME5TJYR–Model of Cheirolepis trailli, An Extinct Ray-finned Fish That Lived In The Devonian Period Of Europe and North America

Bothriolepis canadensis fossil, antiarch placoderms that lived during the Middle to Late Devonian period of the Paleozoic Era, Canada Stock Photo

RM2R149F0–Bothriolepis canadensis fossil, antiarch placoderms that lived during the Middle to Late Devonian period of the Paleozoic Era, Canada

Fossil Plate Of Ammonites and Belemnites, Devonian, Morocco Stock Photo

RMRY34N9–Fossil Plate Of Ammonites and Belemnites, Devonian, Morocco

Tiktaalik, extinct transitional species between fish and legged animals from the Late Devonian Period Stock Photo

RF2HXJ8PE–Tiktaalik, extinct transitional species between fish and legged animals from the Late Devonian Period

RMHRP5WY–Devonian Period

Trilobite Phacops sp. Devonian Period, Morocco Stock Photo

RMMFENNB–Trilobite Phacops sp. Devonian Period, Morocco

Ammonites auritus, Print, Ammonoidea, Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out in the Cretaceous–Paleogene extinction event Stock Photo

RM2A2KYR2–Ammonites auritus, Print, Ammonoidea, Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out in the Cretaceous–Paleogene extinction event

Orthoceras mollusc fossil slab 350 to 500 millions years old, fossil marine organisms Stock Photo

RMAH3Y2A–Orthoceras mollusc fossil slab 350 to 500 millions years old, fossil marine organisms

A Late Devonian Ichthyostega emerges from waters of a floodplain. Stock Photo

RMC525FX–A Late Devonian Ichthyostega emerges from waters of a floodplain.

Fossil Fish [Pterichthodes milleri] Mid-Devonian - Caithness Scotland - Placoderm Stock Photo

RMB94B1D–Fossil Fish [Pterichthodes milleri] Mid-Devonian - Caithness Scotland - Placoderm

trilobite (Psychopyge elegans), Devonian trilobite (410-360 million years), location Morocco Stock Photo

RMEBP0XT–trilobite (Psychopyge elegans), Devonian trilobite (410-360 million years), location Morocco

The Late Devonian monster Dunkleosteus (Safari, 2006) terrorized the ancient world's oceans 385 to 359 million years ago. Stock Photo

RF2T4WA3F–The Late Devonian monster Dunkleosteus (Safari, 2006) terrorized the ancient world's oceans 385 to 359 million years ago.

Digital illustration of Drepanaspis swimming underwater Stock Photo

RMPFR2J4–Digital illustration of Drepanaspis swimming underwater

This brilliant model of the Late Devonian monster Dunkleosteus (by Schleich, 2015) shows a creature that terrorized the ancient world's oceans. Stock Photo

RF2PGP20C–This brilliant model of the Late Devonian monster Dunkleosteus (by Schleich, 2015) shows a creature that terrorized the ancient world's oceans.

RM2T6D1T6–Asterolepis cornutus, extinct species of armour-plated fish, antiarch placoderm of the Devonian. Flugelfisch (Pterichthys cornutus Agassiz). Colour printed illustration by F. John from Wilhelm Bolsches Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908.

trilobite stone fossil sample with ridges and detail Stock Photo

RF2DH85T7–trilobite stone fossil sample with ridges and detail

Palaeozoology - Devonian period - Fossil amphibians - Ichthyostega - Art work by James Robins Stock Photo

RMF02F3X–Palaeozoology - Devonian period - Fossil amphibians - Ichthyostega - Art work by James Robins

Vancouver, Friday. 2nd Sep, 2024. Fossils of water animals from the Devonian Period are on display during the Monsters of the Abyss exhibition at the Vancouver Aquarium in Vancouver, British Columbia, Canada, Feb. 9, 2024. The Vancouver Aquarium's new exhibition, 'Monsters of the Abyss', kicked off on Friday, highlighting the past and present of aquatic animals through interactive displays, live exhibits, and skeletons such as Megalodon and Spinosaurus. The exhibition will last till Sept. 2, 2024. Credit: Liang Sen/ Xinhua/Alamy Live News Stock Photo

RM2WHFACD–Vancouver, Friday. 2nd Sep, 2024. Fossils of water animals from the Devonian Period are on display during the Monsters of the Abyss exhibition at the Vancouver Aquarium in Vancouver, British Columbia, Canada, Feb. 9, 2024. The Vancouver Aquarium's new exhibition, 'Monsters of the Abyss', kicked off on Friday, highlighting the past and present of aquatic animals through interactive displays, live exhibits, and skeletons such as Megalodon and Spinosaurus. The exhibition will last till Sept. 2, 2024. Credit: Liang Sen/ Xinhua/Alamy Live News

Devonian Trilobite Variant 3 Extinct Arthropod Digital Art By Winters860 Stock Photo

RF2M1EYP2–Devonian Trilobite Variant 3 Extinct Arthropod Digital Art By Winters860

This model is made by Bullyland. Ammonites could be found from the Devonian Period to the late Cretaceous, 416 to 66 million years ago. Stock Photo

RF2PGFJE8–This model is made by Bullyland. Ammonites could be found from the Devonian Period to the late Cretaceous, 416 to 66 million years ago.

Brachiopod Gigantoproductus giganteus Stock Photo

RMPRN20N–Brachiopod Gigantoproductus giganteus

Bothriolepis (by Kaiyodo) forages along the ocean floor during the Devonian Period, 387 to 360 m.y.a. Stock Photo

RF2PR13WD–Bothriolepis (by Kaiyodo) forages along the ocean floor during the Devonian Period, 387 to 360 m.y.a.

Ammonite (Goniatite) Fossils, Morocco Stock Photo

RMMFENMG–Ammonite (Goniatite) Fossils, Morocco

RMHRP5WX–Devonian Period

Ammonite (Goniatite) Fossil, Morocco Stock Photo

RMMEGH0P–Ammonite (Goniatite) Fossil, Morocco

Ammonites jason, Print, Ammonoidea, Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out in the Cretaceous–Paleogene extinction event Stock Photo

RM2A2KYTA–Ammonites jason, Print, Ammonoidea, Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out in the Cretaceous–Paleogene extinction event

RFB8F47P–Trilobite fossil.

Dinichthys, extinct genus of placoderms, armored fish from the Devonian. Stock Photo

RMCB8NHK–Dinichthys, extinct genus of placoderms, armored fish from the Devonian.

. Elements of geology : a text-book for colleges and for the general reader. Geology. DEVONIAN ANIMALS. 341 slightly so; in Devonian Ganoids the tail-fins are always distinctly vertebrated. All Placoids, both living and extinct, have vertebrated. Fig. 444.—Homocercal Tail-fin : A, form; B, structure. Fig. 445.—Heterocercal or Vertebrated Tail-fin: A, form; B, structure. tail-fins. Therefore, all Devonian fishes, without exception, had verte- brated tail-fins—sometimes asymmetric (Figs 431,434), and sometimes symmetric (Figs. 432,433). 5. In all Teleosts, and in nearly all living fishes, the pa Stock Photo

RMRCJFF2–. Elements of geology : a text-book for colleges and for the general reader. Geology. DEVONIAN ANIMALS. 341 slightly so; in Devonian Ganoids the tail-fins are always distinctly vertebrated. All Placoids, both living and extinct, have vertebrated. Fig. 444.—Homocercal Tail-fin : A, form; B, structure. Fig. 445.—Heterocercal or Vertebrated Tail-fin: A, form; B, structure. tail-fins. Therefore, all Devonian fishes, without exception, had verte- brated tail-fins—sometimes asymmetric (Figs 431,434), and sometimes symmetric (Figs. 432,433). 5. In all Teleosts, and in nearly all living fishes, the pa

Ophiuroid (Euzonosoma tischbeinianum, Euzonosoma tischbeiniana), fossile ophiuroid from Devonian (410-360 million years), locality Germany Stock Photo

RMEBP0Y3–Ophiuroid (Euzonosoma tischbeinianum, Euzonosoma tischbeiniana), fossile ophiuroid from Devonian (410-360 million years), locality Germany

Pterichthyodes, extinct genus of placoderm fishes from the Devonian period. Stock Photo

RMCB5M9J–Pterichthyodes, extinct genus of placoderm fishes from the Devonian period.

coral (Cyathophyllum spec.), fossilized coral, Eifel, Germany Stock Photo

RMEBK463–coral (Cyathophyllum spec.), fossilized coral, Eifel, Germany

limestone of Greifenstein, Germany with fossils Stock Photo

RF2EAW30Y–limestone of Greifenstein, Germany with fossils

RM2T6D2W6–Reconstruction of a Dinichthys catching a wave. Extinct monospecific genus of giant, marine arthrodire placoderm from the Late Devonian (Famennian stage). Dinichthys herzeri. Colour printed illustration by F. John from Wilhelm Bolsches Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908.

fossil sedimentary rock sample, rare earth specimen Stock Photo

RF2DH80NP–fossil sedimentary rock sample, rare earth specimen

Palaeozoology - Devonian period - Fossil amphibians - Ichthyostega - Art work by Tim Hayward Stock Photo

RMF02F3Y–Palaeozoology - Devonian period - Fossil amphibians - Ichthyostega - Art work by Tim Hayward

Dunkleosteus (Dunkleosteus, Dinichthys), largest know member of extict Placodermi Stock Photo

RMEBW0A6–Dunkleosteus (Dunkleosteus, Dinichthys), largest know member of extict Placodermi

Trilobite Calymene blumbeybachi Silurian Devonian Wenlock series Stock Photo

RMB38W5F–Trilobite Calymene blumbeybachi Silurian Devonian Wenlock series

An armored Bothriolepis glides along the bottom of a flooded plain. Stock Photo

RMC525DH–An armored Bothriolepis glides along the bottom of a flooded plain.

Tiktaalik, extinct walking fish, the evolution of four-legged animals Stock Photo

RF2JBR1KP–Tiktaalik, extinct walking fish, the evolution of four-legged animals

Pterygotus (by Kaiyodo) was a fearsome 'sea scorpion' of the Late Silurian and Early Devonian Periods, 428 to 391 m.y.a. Stock Photo

RF2PR13JH–Pterygotus (by Kaiyodo) was a fearsome 'sea scorpion' of the Late Silurian and Early Devonian Periods, 428 to 391 m.y.a.

A prehistoric Dunkleosteus fish prepares to eat a primitive shark. Stock Photo

RMD3EXF0–A prehistoric Dunkleosteus fish prepares to eat a primitive shark.

RMHRKKM1–Devonian Period

Orthoceras / Orthoceratites fossils in rock, genus of extinct nautiloid cephalopods Stock Photo

RM2R0YRA9–Orthoceras / Orthoceratites fossils in rock, genus of extinct nautiloid cephalopods

Ammonites ornatus, Print, Ammonoidea, Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out in the Cretaceous–Paleogene extinction event Stock Photo

RM2A2KYTN–Ammonites ornatus, Print, Ammonoidea, Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out in the Cretaceous–Paleogene extinction event

Evolution of Fishes, Illustration Stock Photo

RF2BEH6AE–Evolution of Fishes, Illustration

RMB8F47D–Trilobite fossil.

Domestic cattle, Red Ruby Devon herd, standing on pasture, Exeter, Devon, England, United Kingdom Stock Photo

RM2PJRD5R–Domestic cattle, Red Ruby Devon herd, standing on pasture, Exeter, Devon, England, United Kingdom

RFRDKWMJ–Trilobite fossil 5

Trilobite Phacops africanus, Devonian, Morocco Stock Photo

RMCWEYAT–Trilobite Phacops africanus, Devonian, Morocco

Freshwater crocodiles resting on the banks of Lennart River in the Windjana Gorge National Park, Kimberley, Western Australia Stock Photo

RMDANNKB–Freshwater crocodiles resting on the banks of Lennart River in the Windjana Gorge National Park, Kimberley, Western Australia

Radiolarite of Duensberg, Biebertal, Germany in a closeup Stock Photo

RF2EAW30M–Radiolarite of Duensberg, Biebertal, Germany in a closeup

RM2T698WN–Helicoprion bessonowi, shark-like eugeneodontid holocephalid fish with tooth whorl from the Permian, and prehistoric prickly shark species Xenacanthus decheni of the Devonian and Triassic. Spiralhai, Helicoprion, und Stachelhai, Xenacanthus. Colour printed illustration by F. John from Wilhelm Bolsches Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908.

RF2DH807H–trilobite stone fossil sample with ridges and detail

Palaeozoology - Devonian period - Marine environment - Art work by Robin Carter Stock Photo

RMF02F5P–Palaeozoology - Devonian period - Marine environment - Art work by Robin Carter

RMEBW0AM–Dunkleosteus (Dunkleosteus, Dinichthys), largest know member of extict Placodermi

Model Of A Cephalaspis, an Early Devonian European Fish Stock Photo

RMC1R4H0–Model Of A Cephalaspis, an Early Devonian European Fish

TRILOBITE FOSSILS Phacops rana Mid-Devonian Era Ontario, northern USA Stock Photo

RMMFC9X0–TRILOBITE FOSSILS Phacops rana Mid-Devonian Era Ontario, northern USA

Tiktaalik, extinct legged fish, the evolution of four-legged animals Stock Photo

RF2HXJ8R0–Tiktaalik, extinct legged fish, the evolution of four-legged animals

Casts (most likely) of three trilobite species from the Devonian. Stock Photo

RMBGAHN2–Casts (most likely) of three trilobite species from the Devonian.

A Drepanaspis on the bottom of a shallow Devonian sea. Stock Photo

RMD3EXEM–A Drepanaspis on the bottom of a shallow Devonian sea.

Odontocile sp. (Trilobite) 350 million years old (Middle Devonian) Collected from the Atlas Mountains, Morocco, North Africa Stock Photo

RFBRMHA4–Odontocile sp. (Trilobite) 350 million years old (Middle Devonian) Collected from the Atlas Mountains, Morocco, North Africa

Limestone relief consists of two multicolored geologic layers Stock Photo

RF2A9RX1C–Limestone relief consists of two multicolored geologic layers

Ammonites benettianus, Print, Ammonoidea, Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out in the Cretaceous–Paleogene extinction event Stock Photo

RM2A2KYR4–Ammonites benettianus, Print, Ammonoidea, Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out in the Cretaceous–Paleogene extinction event

RF2BEH69F–Evolution of Fishes, Illustration

RMB8F48D–Trilobite fossil.

RM2PJRD35–Domestic cattle, Red Ruby Devon herd, standing on pasture, Exeter, Devon, England, United Kingdom

Tiktaalik. The Tikaalik was a 375 million-year-old large aquatic predator with flattened head and body, represents an important intermediate step in the evolutionary transition from fish to animals that walked on land. Stock Photo

RMG16C9G–Tiktaalik. The Tikaalik was a 375 million-year-old large aquatic predator with flattened head and body, represents an important intermediate step in the evolutionary transition from fish to animals that walked on land.

Dire Wolf Skull Digital Art By Winters860 Isolated, Background Stock Photo

RF2M1F4TW–Dire Wolf Skull Digital Art By Winters860 Isolated, Background

RFRDKWN1–Trilobite fossil 2

Paleo-art, Osteolepis, extinct Scottish lobe-finned fish from theDevonian period, covered in scales, this rhipidistian shared features with tetrapods. Stock Photo

RM2RJPMAA–Paleo-art, Osteolepis, extinct Scottish lobe-finned fish from theDevonian period, covered in scales, this rhipidistian shared features with tetrapods.

Dinichthys, extinct genus of placoderms, armored fish from the Devonian. Colour printed (chromolithograph) illustration by F. John from 'Tiere der Urwelt' Animals of the Prehistoric World, 1910, Hamburg. From a series of prehistoric creature cards published by the Reichardt Cocoa company. Stock Photo

RMP55R5E–Dinichthys, extinct genus of placoderms, armored fish from the Devonian. Colour printed (chromolithograph) illustration by F. John from 'Tiere der Urwelt' Animals of the Prehistoric World, 1910, Hamburg. From a series of prehistoric creature cards published by the Reichardt Cocoa company.