Apatosaurus considered a junior synonym of "Apatosaurus"; its only species was reclassified as "A.excelsus" in 1903. A 2015 study concluded that "Brontosaurus" is a valid genus of sauropod distinct from "Apatosaurus", but not all paleontologists agree with this division. As it existed in North America during the late Jurassic, "Apatosaurus" would have lived alongside dinosaurs such as "Allosaurus", "Camarasaurus", "Diplodocus", and "Stegosaurus". "Apatosaurus" was a large, long-necked, quadrupedal animal with a long, whip-like tail. Its forelimbs were slightly shorter than its hindlimbs. Most size estimates are based on specimen CM3018, the type specimen of "A.louisae". In 1936 this was measured to
Unthought known unthought known. Bollas also linked the concept to D. W. Winnicott's notion of the true self. In terms of systems-centered therapy, the concept refers to the boundary between "apprehensive" knowing (non-verbal) and "comprehensive" knowing – what we can allow ourselves to formulate in words. In therapy, the unthought known can become the subtext of the therapeutic interchange – the therapist's role then becoming that of picking up and containing (through projective identification) what the patients themselves cannot yet think about. Unthought known Unthought known is a phrase coined by Christopher Bollas in the 1980s to represent those experiences in some