Popular Posts


MONTESSORI ZOOLOGY : Main Characteristics of Annelida

Related image


Phylum: Annelida: bilaterally symmetrical, vermiform; more than 2 cell layers, tissues, organs, body cavity - true coelom, often divided by internal septa; mouth & anus, true closed circulatory system, no true respiratory organs, nervous system w/ anterior nerve ring, ganglia, ventral nerve chord, reprod: normally sexual, gonochoristic, or hermaphroditic; uses metanephridia to remove waste from blood and coelomic fluid; nephridia found in each segment

There are three phyla of worms :
flatworms, called Platyhelminthes,
roundworms, called Nematodes, and
segmented worms, called Annelida. 

Planarians and tapeworms are examples of
 Platyhelminthes. Tricinella and hookworms
are example of round worms. Earthworms
and leeches and seaworms are
examples of segmented worms.


 Pinegreenwoods Montessori
Montessori Zoology