Lampreys differ from hagfishes by having a notochord that is surrounded by a tube of cartilage.
agnathans
The skeletons of lampreys and hagfishes are made of cartilage rather than bone. This cartilaginous skeleton provides structure and support to their bodies without the need for true bones.
jawless fishes
Yes pigeons have spleens. All vertebrates have spleens except lampreys and hagfishes.
Lampreys and hagfishes are the only jawless vertebrates to survive today. They both have a round mouth and for this reason are often referred to as cyclostomes.
They also do not have pairs of fins like most fish. But the most remarkable thing about these fish is that they do not have jaws! Instead, the mouths of these fishes have structures for scraping, stabbing. Hagfishes and lampreys are the only living kinds of jawless fishes.
Bony fishHag fishLamprey(both of these are known as the jawless fish)Sharks and rays(both of these are known as cartilaginous fish)Lob-finned fishThis is a very simplified classification of something that is very complex. To see the full tree, try WikiSpieces.
There are two different types of jawless fish basically, the hagfishes and the lampreys. The larval stages of thse organisms are filter feeders, and eat a variety of plankton. The adult lamprey feeds on fish blood, as they are parasites. The adult hagfish feeds on dead and decaying animal material such as fish or marine mammal carcasses.
I found 3 different kinds:Petromyzon marinus - Sea LampreyBrook lampreys (Lampetra planeri)River lampreys (Lampetra fluvitilis)
by pooing
n. 1. a class of eel-shaped chordates with a cartilaginous skeleton lacking jaws, scales, and pelvic fins. Among these are the lampreys and hagfishes. There are some extinct forms.
Surfeit of Lampreys was created in 1941.