Anatomical studies , particularly studies of the most primitive troodontids , like Sinovenator , demonstrate striking anatomical similarities with Archaeopteryx and primitive dromaeosaurs , and demonstrate that they are relatives . The clade is called ` Paraves ' . Anatomical studies , particularly studies of the most primitive troodontids , like Sinovenator , demonstrate striking anatomical similarities with Archaeopteryx and primitive dromaeosaurids , and demonstrate that they are relatives comprising a clade called Paraves .