phylum chordata

What four traits first appeared in Phylum Chordata?

Notochord, dorsal nerve cord, pharyngeal slits, post anal tail

What are the three subphyla of Phylum Chordata?

Subphylum cephalochordata lancelets

Subphylum vertebrate vertebrates

Subphylum tunicata sea squirts

notochord

rigid rod shaped struture foind in embryos

in vertebrates, the notochord develops into our spine

dorsal nerve cord

tubular cord of nervous tissue about the notocord of a chordate,

in vertebrates, the dorsal nerve cord develops into the central nervous system

Know how many traits each subphylum retains:

• Urochordata: 4 as larvae, 1 as adults.

• Cephalochordata: 4 as larvae and adults.

• Vertebrata: 4 as embryos, 3–4 as adults (notochord becomes the vertebral column).

What are the pharyngeal slits? use

openings in the pharynx. The pharynx is a part of the throat

• Cephalochordata (lancelets): Pharyngeal slits become filter-feeding structures used to collect food from water.

• Tunicata (tunicates): Pharyngeal slits become a large filter-feeding basket that helps trap food particles.

post anal tail use

extension of doral nerve cord from behind the anus

In Subphylum Cephalochordata (lancelets), the post-anal tail is used for movement and swimming by helping them move through the water.

What is the central nervous system composed of?

The central nervous system (CNS) is composed of the brain and spinal cord

subphylum vertebrata

Class Agnatha (Jawless fish)
Class Chondrichthyes( Cartilaginous fish)
Class Osteichthyes (Bony fish)
Class Amphibia (Amphibians)
Class Reptilia (Reptiles)
Class Aves (Birds)
Class Mammalia (Mammals)