What is the name of a eel shaped fish without a jaw that retains its notochord?

An animal that retains its chordate features throughout life is the?

lamprey. Lampreys are jawless fish that retain chordate features such as a notochord and a dorsal hollow nerve cord throughout their entire life cycle.

Which phyla possesses members that have a notochord?

Chordata is the phylum that possesses members with a notochord, which is a flexible rod-like structure that provides support. This phylum includes animals such as mammals, birds, reptiles, amphibians, and fish.

As the embryo develops only jawless fish retain the notochord What does this indicate about the evolution of vertebrates?

Many vertebrates retain parts of notochord .

Do cats exhibit a notochord at some stage of its development?

You did. Your backbone formed on the notochord. There are some fish, the lamprey, I think, that retain a notochord, These animals are chordates but not vertebrates.

What classifications are tunicates and lanceletes?

Tunicates and lancelets represent the two groups of jawless fish. All other species of jawless fish have gone extinct.

Why fish and birds are kept in the same phylum?

Humans, birds, and fish all have a notochord that is replaced by a vertebral column as the body develops.

What is a spindle-shaped fish?

Spindle-shaped is the most common body type for fish. Some fairly common spindle-shaped fish are carp, trout, tuna, and mackerel.

Are all fish chordates?

All fish are chordates. Chordates are vertebrates that have a hollow dorsal nerve called a notochord. They also have a central nervous system and gill clefts.

Difference between notochord and vertebral coloum?

1) The notochord is the defining structure of the phylum Chordata, which includes all vertebrates. In its "mature" state, the notochord is a rod of large cells constrained by a thick extracellular sheath and positioned between the developing spinal cord and gut. Turgor pressure generated by notochord cells exerted against the sheath gives the notochord stiffness, imparting the mechanical properties required for one of its main functions as the central axial skeletal element of the developing embryo. 2) The notochord exists transiently during the life of most vertebrates. During its short life, however, the notochord plays another critical role for developing embryos,.producing a variety of secreted growth factors, such as Sonic hedgehog, which instruct surrounding tissues to acquire particular differentiated fates. A number of embryological experiments, for example, tell us that, without notochord-derived signals, motorneurons in the spinal cord would not form, the pancreas insulin-producing cell would not differentiate, and the body muscles would not be produced properly. Without the axial skeletal support of the notochord, many lower vertebrate larvae, such as fish fry and tadpoles, become severely shortened and cannot swim or feed properly. Thus many of the mutations affecting zebrafish notochord development are named after the seven dwarves.

What tipe of fish is a medium swimming fish with t-shaped taile?

cat fish

What is the Difference between starfish and fish?

the differences is that a fish has

What type of fish is oblong shaped?

Mitochondria