A cardiac valve prosthesis comprising: an armature for anchorage of the valve prosthesis at an implantation site, said armature defining a lumen for the passage of the blood flow and having a longitudinal axis (X1); and a set of prosthetic valve leaflets supported by said armature and configured to move, under the action of blood flow, in a radially divaricated condition to enable the flow of blood through said lumen in a first direction, and in a radially contracted condition, in which said valve leaflets co-operate with one another and block the flow of blood through the prosthesis in the direction opposite said first direction, the armature comprising: an annular part a pattern of arched struts carried by said annular part , said pattern of arched struts having proximal ends connected to said annular part, and distal ends spaced axially from the proximal ends and opposite said annular part , the cardiac valve prosthesis being characterized in that the armature further comprises: a plurality of sets of anchoring formations configured to protrude radially outwardly of said annular part , each set being supported by at least one of said annular part and a corresponding arched strut , and a plurality of support posts , each support post being supported by adjacent arched struts , wherein the sets of anchoring formations alternate with the support posts around said longitudinal axis . an armature for anchorage of the valve prosthesis at an implantation site, said armature defining a lumen for the passage of the blood flow and having a longitudinal axis (X1); and a set of prosthetic valve leaflets supported by said armature and configured to move, under the action of blood flow, in a radially divaricated condition to enable the flow of blood through said lumen in a first direction, and in a radially contracted condition, in which said valve leaflets co-operate with one another and block the flow of blood through the prosthesis in the direction opposite said first direction, the armature comprising: an annular part a pattern of arched struts carried by said annular part , said pattern of arched struts having proximal ends connected to said annular part, and distal ends spaced axially from the proximal ends and opposite said annular part , an annular part a pattern of arched struts carried by said annular part , said pattern of arched struts having proximal ends connected to said annular part, and distal ends spaced axially from the proximal ends and opposite said annular part , the cardiac valve prosthesis being characterized in that the armature further comprises: a plurality of sets of anchoring formations configured to protrude radially outwardly of said annular part , each set being supported by at least one of said annular part and a corresponding arched strut , and a plurality of support posts , each support post being supported by adjacent arched struts , wherein the sets of anchoring formations alternate with the support posts around said longitudinal axis . a plurality of sets of anchoring formations configured to protrude radially outwardly of said annular part , each set being supported by at least one of said annular part and a corresponding arched strut , and a plurality of support posts , each support post being supported by adjacent arched struts , wherein the sets of anchoring formations alternate with the support posts around said longitudinal axis . <EOS>