cephlochordates
During the Ordovician period, the first land plants evolved, as well as the first jawless fish, jawed fish, and arthropods like trilobites. This period also saw the emergence of the first coral reefs.
The first vertebrates (as far as is known) were a group of extinct*, jawless, heavily-armored fishes called Ostracaderms. *There are a few zoologists who feel that the hagfish and possibly the lamprey and slime hag are ostracaderms, but I disagree. I'm not at all sure that the hagfish and slime hag are true vertebrates.
No, shrimp are not considered fish in the classification of aquatic animals. Shrimp belong to the crustacean group, while fish belong to the group of vertebrates.
No, shrimp are not considered a type of fish. Shrimp belong to a different group of animals called crustaceans, while fish belong to the group of animals known as vertebrates.
Jawless fish are filter-feeders.
Jawless fish are Phylum Chordata, they are also known as paraphyletic, they still are around today.
A: jawless fish
An example of a jawless fish is the adult lamprey. The lamprey (scientific name : Agnatha) has a toothed, funnel-like sucking mouth.
Clown fish do have jaws, so they are not a jawless fish.
Most fish are not jawless. There is a small group of very primitive fish called Jawless fish (Agnatha). However, they make up a very small proportion (<1%) of the fish species on earth. Jawless fish are things like lamprey and hagfish. All other fish, like trout, salmon, tuna, sharks, rays, cichlids, goldfish, etc, etc, have jaws. See the related link for more information on the primitive jawless fish.
yes, jawless fish have no paired fins
Jawless fish have an internal cartelagenous endoskeleton.
Jawless fish belong to the group known as Agnatha. This group includes species such as lampreys and hagfish, which are characterized by the absence of jaws and paired fins. Agnatha is considered one of the most primitive classes of vertebrates, and these fish have a unique, elongated body structure and a cartilaginous skeleton.
Jawless fish breathe from gills.
No, they are jawless fish.
Jawless fish are the oldest group of fish, belonging to the class Agnatha. Within this class, they are further divided into two orders: the Petromyzontiformes (lampreys) and the Myxiniformes (hagfish).
Both jawless fish and cartilaginous fish have skeletons made of cartilage.