这种小恐龙称为伊氏西爪龙，它的化石是于1982年在加拿大阿尔伯塔省约7500万年前恐龙公园组地层中被挖掘出来的，但之后的25年中一直未加以研究。
The remains of the diminutive dinosaur, called Hesperonychus, were excavated at the 75m-year-old Dinosaur Park Formation site in Alberta in 1982, but had lain unstudied for 25 years.
北美西部晚坎帕阶的暴龙类化石记录在北部地区的落基山脉（蒙大拿州，艾伯塔）和西南地区（新墨西哥州，犹他州）依然有地理上差距。
The fossil record of late Campanian tyrannosauroids of western North America has a geographic gap between the Northern Rocky Mountain Region (Montana, Alberta) and the Southwest (New Mexico, Utah).
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