Walking With Wikis


Fish are members of a group of ectothermic vertebrates, which possess gills and now lack limbs. instead, for moving underwater, they possess fins. They live in both salt and fresh water.  Fish range from the tiny, primitive Haikouichthys to the huge Dunkleosteus. The word "icthy" means fish. fish survive today.


Fish, in general are the oldest type of vertebrates known to this day  and  the lobe-finned fish  developed into another group of animals know as amphibians, who were the first vertebrates to live on land even if only partially. (For their own part,  fish probably have evolved from the wormlike  creatures similar both to the modern lamprey and  the Cambrian Haikouitchthys.)

In Walking with... Series

The * means that the fish only appears dead.

The following fish have appeared in Impossible Pictures works:

- Agnathans (Jawless fish): Cambrian - Haikouichthys (Walking with Monsters); OrdovicianAstraspis (Sea Monsters); Silurian - Cephalaspis (Walking with Monsters); Cretaceous - Hagfish (books only)

-  Chondrichthyans (Cartilaginous fish): Devonian - Stethacanthus (Sea Monsters, Walking with Monsters); Jurassic - Hybodus (Walking with Dinosaurs, Sea Monsters); Cretaceous - an unidentified shark (Sea monsters); Eocene - Physogaleus (Walking with Beasts); Pliocene - Megalodon (Sea Monsters)

-  Placoderms (Armored fish): Devonian - Dunkleosteus (Sea Monsters); Devonian - Bothriolepis (Sea Monsters)

-  Actinopterygians (Ray-finned fish): Devonian - Angelfish (Walking with Monsters), Permian - Koi fish* (Walking with Monsters), Permian - Palaeoniscium* (Walking with Monsters) Jurassic - Leptolepis (Walking with Dinosaurs), Leedsichthys (Sea Monsters); Cretaceous - Xiphactinus (Sea Monsters);Eocene - unidentified bony fish (Walking with Beasts) unidentified bony fish (Walking with Cavemen)

-  Sarcopterygians (lobe-finned fish): Devonian - Hyneria (Walking with monsters), Eusthenopteron ("The Complete Guide to Prehistoric Life" - mentioned); Triassic - unidentified lungfish (Walking with Dinosaurs); elsewhere - Coelacanth (books only)