Class 3 Flashcards
What does an embryo of a chordate consist of
Dorsal tubular nerve,notochord,gut,pharyngeal gill slots,anus,post anal tail
Do non chordates have a notochord
No
Where is the notochord present
Above gut below dorsal tubular nerve chord
What is a notochord
A rod like structure that acts as a spine in embryo and vertebral column in adults
Are all chordates vertebrates
No example amphioxus
What is metamerism
Division of body internally as well as externally with repetition of some organs
How many segments id an earthworm divided into
100 to 120
What are the external and internal points of division known as in an earthworm
Intersegmental groove(external)
Intersegmental septum(internal)
What is true metamerism
When segments are from from posterior to anterior
Ex earth worm
What is pseudometamerism
Segments are formed from anterior to posterior
Ex taenia solium
What are the two sub kingdoms of animalia
Parazoa (cellular -phylum porifera)
Eumetzoa
What are the sub kingdoms of eumetzoa
Diploblastia or radiata with endoderm and ectoderm and bilateria or triploblastia with endoderm ectoderm and mesoderm germinal layers
What are the divisions of triploblastia
Protstomia ex cnidarian and ctenophora and deuterostomia
What are the sub divisions of protstomia
*Acoelmata ex platyhelminthes
*Pseudocoelmata ex aschelminthes
*Schizocoelmata ex annelida arthropoda mollusca
What are the sub divisions of deuterostomia
Enterocoelmata ex herichordates and Echinodermata
