What is an example of an Invertebrate chordate?

Characteristics of the invertebrate Chordata:-

1)Bilaterally symmetrical.

2)Body has more than two cell layers, tissues and organs.

3)Body cavity a true coelom.

4)Most possesses a through gut with a non-terminal anus.

5)Body monomeric with no head or jaws.

6)Possess at some stage of their life a hollow dorsal nerve tube.

7)Possess at some stage of their life a dorsal cartilaginous rod called a notochord.

8)Possess at some stage of their life gill slits in the parangeal region.

9)Has a partially open circulatory system.

10)Without excretory organs.

11)Reproduction normally sexual and gonochoristic.

12)Feed on a variety of organic materials.

13)All live marine environments.

Examples of an invertebrate chordate are Fish, Amphibians, Reptiles, Birds and Mammals.

(http:/wwwzperiodzearthlifezperiodznet/inverts/chordatazperiodzhtml)

More specifically, a box fish, cow fish, or trunk fish. Characteristics include the following:

With their rigid bodies propelled "helicopter fashion" by tiny, rapidly moving fins, these fish are an amusing sight as they motor about the aquarium.

Their appeal is heightened by an "alert" face, and, in many species, horn-like projections at the head and rear of the body (see color insert for photo).

Although immune from attack by most large predators due to their hard covering of bony plates, box- and cowfish are slow moving and their rapidly undulating fins seem to draw attacks from smaller fish. The skin over the rigid plates is, strangely, quite sensitive and also suffers from the attentions of aggressive tank mates.

(http:/wwwzperiodzeverythingzperiodzcom/OdditieszhyphenzforzhyphenzBoxfishzhyphenzTrunkfishzhyphenzandzhyphenzCowfishzhyphenzFamilyzhyphenzOstraciidae)