This family of enzymes reversibly catalyzes the transfer of phosphate between ATP and various phosphogens (e.g. creatine phosphate). ATP + taurocyamine = ADP + H(+) + N-phosphotaurocyamine Expressed at low levels in 37-day sporocysts, increases 25-fold in the infective cercarial and early schistosomular stages. Levels decrease dramatically in adults, adult males have approximately twice the expression level as in adult females. Belongs to the ATP:guanido phosphotransferase family.