Ammonite - extinct marine mollusc
HTML-код
- Опубликовано: 15 сен 2024
- Ammonites are extinct marine molluscs of the class Cephalopodia that appeared midway through the Paleozoic Era (400 Mya). They typically had a ribbed spiral-form shell that encased soft body parts and a hardened beak. Ammonites had a wide dispersion and their remains have been found in large numbers around the world. To date no trace fossil has been found of the soft body parts of an ammonite but they are believed to have been similar in anatomy to modern cephalopods such as squid.
Ammonites were able to move widely through the water column using a combination of buoyancy adjustment and siphoned jet propulsion to control their movement. The buoyancy was created by filling and emptying the chambers (camera) of the shell with water via a feature called the siphuncle. Propulsion was created by squirting water through an organ similar to the extant cephalopod hypernome.
Ammonites came in all sizes from the very small to the very large and many grew striking protuberances and spines - thought to have been evolving defence mechanisms against ever larger predators. They are presumed to have had good eyesight so markings and colouration are also thought to have been on display, playing an important role in their appearance.
Ammonites are thought to have been predators - adept at gliding across seabeds using their arms and tentacles to grab prey as it passed by. If attacked themselves they could pull back into the hardened shell and close down a leathery mantle. This dual ability to hunt and protect themselves proved very effective as ammonites survived for over 300 million years.
Because of their wide distribution over such an extensive period of time, ammonites have become important index fossils for evolutionary science.
Paleozoo Evolutionary Models are highly detailed portraits of some of the first animals to evolve on Earth. This detailed, museum grade model has been created by paleoartist Bruce Currie.
More information on Ammonites can be found at www.paleozoo.c...
Other Paleozoo animations include:
• History of Earth - in ...
• Video
• Placoderms of the Devo...
• Video
Cool video, in fact ammonoids (ammonoidea) came in a wide variety of shell shapes depending on the genus of ammonites or family. One of the strangest ones in my opinion is the nipponites
just looked that up, very strange indeed. Almost looks like something that would grow into the earth as opposed to being free swimming.
woah!!!! those guys are wild
Ancestors be like:
Ancestor: "Look a shell!"
Ancestor 2: "No"
I have a fossil like these animals, only in small size and it is very impressive
I have one too😊
A wild Omanite appeared
Nice models and animation, are these based on the ammonite Perisphinctes from the middle Jurassic? Just a wee point; ammonites existed from the Jurassic to the end of the Cretaceous, but the family ammonoidea first appeared in the Devonian. Sorry for being such a palaeo -pedant! 😅
Geology Johnson weren’t their ammonites in the late Cambrian?
@@predatoreusfilms9992 nautiloids, the first shelled cephalopods, appeared in the latest Cambrian. The family ammonoidea didn't appear until the early Devonian though and the first ammonites only appear in the earliest Jurassic. In fact the appearence on ammonites marks the start of the Jurassic period in Western Europe. Check out the video on my channel for more info. ☺️
@@geologyjohnson7700 thanks, will do!
@@predatoreusfilms9992no their wer nautilouds
i've found hundreds of those in the Chalk-Stone of the Jura-Mountains in switzerland
Cool Pokémon
I own a fossil of these animals... Its intresting to see how they once lived. Wich also goes for the ammonite fossil i got in my book shelf....
I want them
At least we have our modern day endangered nautilus
Nice 3D video
The closest thing we have to ammonites are Nautilus
I found a fossil of one of these
Me too
Rafael Suprayogi actually their one of the more common fossils, shows how really widespread and successful they were
I tough it was still alive
@Lakshmi Rani Sarker yeah, I found out later its a species called Nautilus.
The mollusc world sure is an interesting one
Wow great lil video 💪
nice video
Beautiful
So what’s the deal were they delicious or just their time was up?
Almost the day where dinosaurs went extinct.
the eggs of ammonite has been found in tamil nadu
It's not extinct it's a genies lamp who is behind the remarkable house
BABY!! Smol baby!!
Nice
Guess if we boil it or stir fry it add lemon butter garlic and tomato paste it taste just like squids or shrimps
Ammonites didn't fly in water; they were marine animals that swam using gas chambers for buoyancy. They didn't stick to algae but lived in various ocean environments.
They look the similar to nautilus
Why did they go extinct? Seems like they could last as long as there are seas.
The huge meteor killed them all and the dinosaurs
@@oblongfan1 The meteor didn’t kill the dinosaurs. The change in climate caused by meteor killed the dinosaurs. The doesn’t explain why ammonites went extinct.
We were once an ammonite in our life
菊石貝魚 국석패어(암모나이트) ammonite
I have a question sir. How can we know it really look like???
We have a good idea because of the cephalopods on the earth today. And because of the amazing fossils around the world.
I have a very good fossil of one of these with the colours still preserved, there like squids so it's not hard to imagine what the rest might have looked like
I have one.
It’s like nautilus
r.i.p
I love ammonits
Go grandpa 🙏
Ammonite aka pharoahs beard bro from the mehbooba corner
They need wheels if they want to know us
Nautilus
Gonanite
I have amount 35cnm
Its inacurret becuse ammonites dont have hoods
great content and the channel itself is quite interesting..
excellent comments, beautifully said, all the subtleties of this content are noticed _ we give the author good knowledge in his self-study and in his promotion..
To all that, and we learn ourselves..
I'll tell you straightforwardly come.., visit.., add here, as I come and add to you., write.., say.., all of this will only be pleasant, this is how we teach each other, and we teach you and you teach us and teach us., to see the same, to notice the important things that we so often leave without attention, just do not notice and not rarely even miss..
Понимаете ли вы русский язык поговорить надо
wth was tht
thats a ammonite a cephalopod fossil
Ff