Bilaterally symmetrical and acoelomate animals are exemplified by :
Platyhelminthes
Aschelminthes
Annelida
Ctenophora
Members of Platyhelminthes are bilaterally symmetrical and acoelomates
Aschelminthes - Pseudocoelomates
Annelida - Eucoelomates
Ctenophora - Diploblastic acoelomates