1914年发表加拿大有著拱形鼻部的钩鼻龙,[7]改变了布朗对分离龙鼻部形象,他重新检验那些碎片,并修正之前的重建,赋予分离龙一个形似钩鼻龙的拱形鼻部。[4]他还同时将钩鼻龙视为分离龙的异名,[8]这得到查尔斯·惠特尼·吉尔摩的支持,[2]更于1920年代被广泛采纳,如威廉·帕克斯将加拿大物种定名为内弯手分离龙(Kritosaurus incurvimanus);[9]但现在被视为著名钩鼻龙(Gryposaurus notabilis)的异名。[10]1942年李察·斯旺·卢尔(英语:Richard Swann Lull)与纽达·怀特(Nelda Wright)的北美洲鸭嘴龙科专著有著重大影响力,使分离龙=钩鼻龙成为标准共识。[11]自此一直延续到1990年代,分离龙属下至少涵盖了模式种纳瓦荷分离龙、内弯手分离龙、著名分离龙(K. notabilis,原钩鼻龙的模式种)。而卢尔和怀特还将蒙大拿州坎潘阶朱迪斯河层(英语:Judith River Formation)仅知齿骨、1889年由马许命名的短头鸭嘴龙(Hadrosaurus breviceps)[12]归入分离龙,[11]时至今日则不再被承认。[13][14]
1970年代末至1980年代初,鸭嘴龙被牵扯进分离龙与钩鼻龙的异名纠纷,尤其是在一些半学术性的恐龙百科。[15][16]大卫·诺曼(英语:David B. Norman)的《恐龙插画百科》(The Illustrated Encyclopedia of Dinosaurs)中,把加拿大的钩鼻龙化石称为分离龙,并将内弯手分离龙的骨架称为鸭嘴龙。[17]
起初霍纳将阿纳萨齐龙头骨归入纳瓦荷分离龙,[23]但杭特及卢卡斯无法从分离龙的有限材料中发现明确的鉴定特征,而视之为疑名。有鉴于阿纳萨齐龙头骨呈现出独有衍征,且与分离龙没有任何共有衍征,而得以独立为新属新种,[24]后续一些研究支持其论点,[13]但仍受到某些质疑,如托马斯·威廉森(Thomas E. Williamson)支持霍纳原先的解释;[3]随后几项研究则承认两者各自独立。[25][26]
一个在墨西哥沙比纳斯盆地(Sabinas Basin)发现的部分骨骼于2006年由詹姆斯·I·柯克兰(英语:James I. Kirkland)等人称为分离龙未命名种(Kritosaurus sp.),[25]但2013年皮耶妥马奎兹认为这是栉龙亚科未定种。[27]该骨骼的体型比其他已知标本大上20%,身长约11公尺,以坐骨弯曲为特征,成为北美已知体型最大的栉龙亚科之一。遗憾的是该标本也未能保存完整的吻部。[25]
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