A kind of anemia characterized by inadequate production of erythrocytes. The phenotype is Anemia of inadequate production (HP_0010972, a Human Phenotype Ontology entry). Also known as: Anaemia of inadequate production, Anemia, dyserythropoietic, Defective erythropoiesis, Dyserythropoietic anaemia, Dyserythropoietic anemia, Ineffective erythropoiesis.