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The synthesis, structural and physical properties of iron lanthanideoxypnictide superconductors, L4Fe2As2Te1-xO4 (L = Pr, Sm, Gd), with transitiontemperature at ~ 25 K are reported. Single crystals have been grown at highpressure using cubic anvil technique. The crystal structure consists of layersof L2O2 tetrahedra separated by alternating layers of chains of Te and ofFe2As2 tetrahedra: -L2O2-Te-L2O2-Fe2As2-L2O2-Te-L2O2- (space group: I4/mmm, a ~4.0, c ~ 29.6 {\AA}). Substitution of oxygen by fluorine increases the criticaltemperature, e.g. in Gd4Fe2As2Te1-xOyF4-y up to 45 K. Magnetic torquemeasurements reveal an anisotropy of the penetration depths of ~31.

L4Fe2As2Te1-xO4-yFy (L = Pr, Sm, Gd): a layered oxypnictide superconductor with Tc up to 45 K