Zusammenfassung der Ressource
Phylum:
Chordata
- It includes the most
higher animals in the
Animal Kingdom
- The embryos are charaterized
by the presence of
- a skeletal sturcture at
its dorsal region
- the notocord
- persists
throughout
its whole life
- converted into a vertebral
column in the majority of
chordates
- SUB-PHYLUM: VERTEBRATA
- Notochord first appears in
vertebrates in the
embryonic stage
- is replaced as the embryo develops
by the vertebral column
- surrounds and protects the spinal chord
- They have an endoskeleton
- vertebral column
- skull
- girdles
- limbs
- They have a heart
- several chambers
- Blood that flows inside blood
vessles in a closed circulation
- To feed all body organs
with oxygen and
nurtrients
- CLASSIFICATION INTO CLASSES
- Agnatha
- Endoskelelton
- cartilagenous
- The Body
- thin
- long
- eel-like
- with no paired fins
- The mouth
- circular, funnel-shapped
- contains a rough tongue
- provided with many horny teeth
- jawless
- Feeding
- Parasites
- they stick by their mouth
into big fish and attach
themselves by their teeth
- Then, they snap
the flesh of these
fishes by their
rough tongue
- which is similar to the rasp
- Example
- LAMPREY
- chondrichthyes
- Habibtat
- salt waters like seas
- Endoskeleton
- cartilagenous
- The body
- covered with scales similar to teeth
- mouth
- ventral
- it lies on the ventral surphace of head
- provided with 2 jaws
- carry several rows of teeth
helping them in predation
- fins
- Are paired
- Gill slits
- they are uncovered by an operculum
- Air bladder
- NONE
- The sex
- unisexual (separate)
- Fertilization
- internal
- Examples
- sharks
- Ray
- osteichthyes
- Habitat
- salt water
- fresh water
- endoskeleton
- bony
- The body
- covered with bony scales
- The mouth
- terminal
- anterior tip of the body
- Gill slits
- covered with an operculum
- Air bladder
- have a bladder
- helping them in swimming and floating
- the sex
- unisexual
- fertilzation
- external
- examle
- Bouri
- Bolti
- fins
- medial & paired