Oedipus complex desire (libido) for mother, and aggression towards father, student–collaborator Carl Jung counter-proposed that girls experienced desire for father and aggression towards mother via the Electra complex—derived from the 5th-century BC Greek mythologic character Electra, who plotted matricidal revenge with Orestes, her brother, against Clytemnestra, their mother, and Aegisthus, their stepfather, for their murder of Agamemnon, her father (cf. "Electra", by Sophocles). Moreover, because it is native to Freudian psychology, orthodox Jungian psychology uses the term "Oedipus complex" only to denote a boy's psychosexual development. In classical Freudian psychology the super-ego, "the heir to the Oedipus complex", is formed as the
Penis envy by removing the man from the penis or the penis from the man). Freud's theories regarding psychosexual development, and in particular the "phallic stage", were early challenged by other psychoanalysts, such as Karen Horney, Otto Fenichel and Ernest Jones, though Freud did not accept their view of penis envy as a secondary, rather than a primary, female reaction. Later psychologists, such as Erik Erikson and Jean Piaget, challenged the Freudian model of child psychological development as a whole. Jacques Lacan, however, took up and developed Freud's theory of the importance of what he called ""penisneid" in the unconscious of women"