- Is Ichthyosaurus a fish or reptile?
- Why do ichthyosaurs have no lower gills?
- What did Ichthyosaurus eat?
- How did ichthyosaur evolution begin?
- Are there any ichthyosaurs similar to the Early Jurassic period?
- What adaptations do all ichthyosaurs have in common?
- Is a ichthyosaur a mammal?
- Are ichthyosaurs related to dolphins or tuna?
- Do any ichthyosaurs have flippers?
- Why don’t reptiles have gills?
- How did ichthyosaurs evolve?
- What is an Ichthyosaurus?
- What is the difference between a ichthyosaur and a sauropterygian?
- When did ichthyosaurs exist?
- What clade did Ichthyosaurs belong to?
- What happened to the ichthyosaurs in the Jurassic period?
- Did ichthyosaurs lay eggs or give live birth?
- What kind of animal is an Ichthyosaurus?
- What did ichthyosaurs look like?
- What are some examples of ichthyosaurs with flippers?
- What is the difference between a reptile and amphibian?
- Do turtles have lungs or gills?
Is Ichthyosaurus a fish or reptile?
About Ichthyosaurus. You might be forgiven for mistaking Ichthyosaurus for the Jurassic equivalent of a bluefin tuna: this marine reptile had an amazingly fishlike shape with a streamlined body, a finlike structure on its back, and a hydrodynamic, two-pronged tail.
Why do ichthyosaurs have no lower gills?
Since most reptiles are diapsids, ichthyosaurs are inferred to have lost the lower pair. Another indication of their terrestrial origin is their lack of gills.
What did Ichthyosaurus eat?
Based on an analysis of this reptile’s coprolites (fossilized excrement), it seems that Ichthyosaurus fed mainly on fish and squids.
How did ichthyosaur evolution begin?
The answer may lie in the evolution of speedier prehistoric fish (which were able to avoid being eaten), as well as better-adapted marine reptiles like plesiosaurs and mosasaurs. However, a recent discovery may throw a monkey wrench into accepted theories about ichthyosaur evolution.
Are there any ichthyosaurs similar to the Early Jurassic period?
Rhaetian (latest Triassic) ichthyosaurs are known from England, and these are very similar to those of the Early Jurassic. A possible explanation is an increased competition by sharks, Teleostei, and the first Plesiosauria.
What adaptations do all ichthyosaurs have in common?
All of these animals did, however, share a similar set of adaptations to their marine environment. Like dolphins, most ichthyosaurs are believed to have given birth to live young, rather than laying eggs like contemporary land-bound reptiles. (How do we know this?
Is a ichthyosaur a mammal?
Similar to modern cetaceans, such as whales and dolphins, ichthyosaurs were air-breathing. Whales and dolphins are mammals and warm-blooded. Of ichthyosaurs it was traditionally assumed that they were cold-blooded, being reptiles.
Are ichthyosaurs related to dolphins or tuna?
Despite the resemblance of some species to dolphins or bluefin tuna, it’s important to remember that ichthyosaurs were reptiles, and not mammals or fish. All of these animals did, however, share a similar set of adaptations to their marine environment.
Do any ichthyosaurs have flippers?
A Holzmaden ichthyosaur in which the preparer found organic remains in the position of the dorsal fin, but failed to locate any for the flippers. The earliest reconstructions of ichthyosaurs all omitted dorsal fins and caudal (tail) flukes, which were not supported by any hard skeletal structure, so were not preserved in many fossils.
Why don’t reptiles have gills?
In fact, gills are seen during the larval stages of chordates like Amphibians, but in the case of reptiles the development is direct without any larval stage, and so they don’t have any kind of gills. All of the adults and young ones have lungs that they use for breathing when they are on land.
How did ichthyosaurs evolve?
During the Early Triassic epoch, ichthyosaurs evolved from a group of unidentified land reptiles that returned to the sea, in a development similar to how the mammalian land-dwelling ancestors of modern-day dolphins and whales returned to the sea millions of years later, which they gradually came to resemble in a case of convergent evolution.
What is an Ichthyosaurus?
The Ichthyosaurus belongs to order Ichthyosauria. It is believed to have been evolved from land-dwelling reptiles, similar to other Ichthyosaur species. Its phenotypic appearance was very similar to modern-day fish like sharks but its fossils resembled those of dinosaurs. They were very different from the skeletons of fishes.
What is the difference between a ichthyosaur and a sauropterygian?
The ichthyosaurs are reptiles with fishlike bodies; they were live-bearers because their body form prevented beaching to lay eggs. The sauropterygians included an assortment of marine creatures; this group included the plesiosaurs as well as forms that resembled modern-day turtles and walruses. The plesiosaurs have no modern-day analogs.
When did ichthyosaurs exist?
The early to middle Jurassic period (about 200 to 175 million years ago) was the golden age of ichthyosaurs, witnessing important genera like Ichthyosaurus, which is represented today by hundreds of fossils, as well as the closely related Stenopterygius.
What clade did Ichthyosaurs belong to?
From the Middle Jurassic onwards, almost all ichthyosaurs belonged to the thunnosaurian clade Ophthalmosauridae. Represented by the 4 m-long (13 ft) Ophthalmosaurus and related genera, they were very similar in general build to Ichthyosaurus.
What happened to the ichthyosaurs in the Jurassic period?
By the end of the Jurassic period, most ichthyosaurs had gone extinct—though one genus, Platypterygius, survived into the early Cretaceous period, possibly because it had evolved the ability to feed omnivorously (one fossil specimen of this ichthyosaur harbors the remains of birds and baby turtles).
Did ichthyosaurs lay eggs or give live birth?
Like dolphins, most ichthyosaurs are believed to have given birth to live young, rather than laying eggs like contemporary land-bound reptiles. (How do we know this?
What kind of animal is an Ichthyosaurus?
Ichthyosaurus has lent its name to an important family of marine reptiles, the ichthyosaurs, which descended from an as-yet-unidentified group of terrestrial reptiles that ventured into the water during the late Triassic period, about 200 million years ago.
What did ichthyosaurs look like?
Ichthyosaurs resembled both modern fish and dolphins. Their limbs had been fully transformed into flippers, which sometimes contained a very large number of digits and phalanges. At least some species possessed a dorsal fin. Their heads were pointed, and the jaws often were equipped with conical teeth that could help to catch smaller prey.
What are some examples of ichthyosaurs with flippers?
Utatsusaurus and Chaohusaurus are two ichthyosaurs that were disovered in Asia (Motani, 2000) that had limbs that looked akin to flippers. Analysis of Utatsusaurus hataii indicated that ichthyosaurs were in fact diapsids, however, not part of Sauria, which contains other reptiles such as lizards and crocodiles.
What is the difference between a reptile and amphibian?
Reptiles are born in eggs on land and amphibians are born in eggs in the water. And because amphibians are born in water they have gills when they are young, whereas reptiles have lungs. In fact, amphibians are a lot like fish when they are first born, but when they grow, they become more like reptiles. Click to explore further.
Do turtles have lungs or gills?
Turtles get oxygen from the water by moving the water over their body surfaces covered in blood vessels. So, it is very sure and it has been seen that all reptiles have lungs, but neither one have gills.