0
Bony fish and sharks were, until very recently, thought to have evolved during the Silurian period, after the extremely severe Ordovician-Silurian mass extinction.
But we now have jawless fish fossils (ostracoderms) from the Early Cambrian!
Paleontology science believe bony fish (the very first gnathostome infraphylum) was the first to evolve. But we may be wrong.
Fossil register of life in Earth is VERY, VERY scarce. And even more when we talk about life forms more than 400,000,000 years old...
There are very consistent paleontologic theories to point a common ancestor of bony fish and sharks from the Late Ordovician, and they point to sharks evolving first because of the evolutionary emergence of cartilaginous skeletons, which would be a developement - and a design improvement - of the jawless fish primitive notochord.
But we have not yet found any fossil register of this vertebrate common ancestor.
In the meantime, we still have lampreys from the Early Cambrian with rice and sauce, or «À Bordalesa» (an unique Portuguese delicacy!)...
What else can I help you with?
What is an evolutionary innovation associated with cartilaginous fish such as sharks?
:OO
Do sharks and the fish they eat have a symbiotic relationship explain?
Sharks and the fish they eat do not have a symbiotic relationship; instead, their relationship is primarily predatory. Sharks are apex predators that hunt various fish species, which can lead to a decrease in fish populations. While this predation can help maintain ecological balance, it does not constitute symbiosis, as there is no mutual benefit for both parties involved. In fact, the relationship is one-sided, with sharks benefiting at the expense of their prey.
What is the relationship between remora fish and sharks?
Remora fish and sharks have a mutual symbiotic relationship. Studies have shown that there is a bacteria that grows on the sharks that is potentially deadly to a shark. The remora fish eats this bacteria and gets a meal. The remora fish also gets transportation with a lesser energy cost.
What type of relationship do sharks have with fish?
They are an R-Strategist which means that they make many young for a higher chance of survival but don't take care of their young. BA
What is the similarities between sharks and fish?
both fish
What is the difference between sharks and other kinds of fish how do they know that sharks are sharks and not other kinds of fish?
They just know......
What is the symbiotic relationship between the cleaner fish and shark?
The cleaner fish and shark have a mutualistic relationship where the cleaner fish feeds on parasites and dead skin off the shark, providing a cleaning service. In return, the shark gets rid of irritants and benefits from the hygiene provided by the cleaner fish.
What is a predator prey relationship in the Great Barrier Reef?
sharks eat fish
Is the relationship between the clown fish and sea anemone a symbiocis relationship?
is the relationship between the clown fish and sea anemone
Which type of animals are close to chordates from evolutionary point of view?
Chordates are the common ancestors of fish and sharks. They include lampreys and other types of primitive fish species that live in the sea.
What evolutionary milestone involving animals occurred during the devonian period?
Sharks, lung fish, bony fish, trilobite, and,amphibians.
Are tiger sharks fish?
no tiger sharks are fish but r sharks
