Phosphonoureide and phosphonothioureide anthelmintics

A compound of the formula:

• ##STR106## wherein
• A is a divalent arylene group optionally substituted with
• a. halogen;
• b. cyano;
• c. nitro;
• d. di(C.sub.1 -C.sub.18) alkylamino;
• e. vicinal alkylene of from 2 to 6 carbon atoms;
• or
• f. a group of the formula:
• R.sup.1 (A').sub.a
• wherein
• R.sup.1 is
• 1. an alkyl group of from 1 to 4 carbon atoms;
• 2. a substituted or unsubstituted aromatic group containing from 6 to 10 carbon atoms in the aromatic ring;
• A' is oxygen, sulfur, sulfinyl, sulfonyl or carbonyl;
• and a is an integer of 0 to 1;
• R is
• a. hydrogen;
• b. (C.sub.1 -C.sub.10) alkyl;
• c. (C.sub.1 -C.sub.10) haloalkyl;
• d. (C.sub.3 -C.sub.6) cycloalkyl;
• e. (C.sub.2 -C.sub.11) alkoxyalkyl;
• f. (C.sub.1 -C.sub.10) cyanoalkyl;
• g. (C.sub.3 -C.sub.6) alkenyl;
• h. (C.sub.3 -C.sub.6) haloalkenyl;
• i. (C.sub.3 -C.sub.6) alkynyl;
• j. (C.sub.3 -C.sub.6) haloalkynyl;
• k. optionally substituted aralkyl of up to 11 carbon atoms;
• l. substituted or unsubstituted (C.sub.6 -C.sub.10) aryl;
• Y is R', OR', N(R').sub.2 or SR' and
• Y' is OR', N(R').sub.2 or SR' wherein R' is alkyl (C.sub.1 -C.sub.4), substituted alkyl (C.sub.1 -C.sub.4), aralkyl (C.sub.7 -C.sub.10), alkenyl (C.sub.1 -C.sub.4), substituted alkenyl (C.sub.1 -C.sub.4), phenyl, substituted phenyl, naphthyl or substituted naphthyl
• X is oxygen or sulfur;
• X' is oxygen or sulfur;
• and Z is a group of the formula:
• ##STR107## wherein
• R and R.sup.1 are as defined above;
• n is an integer of 0 to 1;
• B is carbonyl, sulfinyl, or sulfonyl;
• Q is alkylene of from 2 to 4 carbon atoms;
• and X" is oxygen or sulfur, provided that when X" is sulfur, X is oxygen;
• or a pharmacuetically acceptable salt of said compound.