In which phylum would you find these organisms ? Pseudo colemn is present ,cylindrical body ,true coelem ,segments lined up from head to tail ?

Dear student,

Elongated cylindrical body shape and Pseudocoelem or fluid filled body cavity are the characteristics of  ​phylum Nematoda.
Examples: Roundworms, Hookworms etc.

True coelem and segmented body are the characteristics of phylum Annelida.
Examples: Earthworms, leeches etc.

Regards.