Triploblastic and Acoelomate Body Plan: Phylum Platyhelminthes

THE Triploblastic Acoelomate Body Plan. EVOLUTIONARY PERSPECTIVE. Members of the phyla Platyhelminthes , Nemertea and Gastrotricha show following advance characters: They are first bilaterally symmetrical animals. Therefore, they are more Complex than the cnidarians. All these animals are triploblastic. They are acoelomate (without a coelom).

Reference:

  • Miller, A.S. and Harley, J.B., 1999 & 2002 . Zoology , 4th and 5th Edition (International), Singapore:McGraw Hill.