俱舍論記 17.156

17.156

「由此已釋至而非無間」者，此即類釋。鬼及傍生，父母於彼以少恩故，彼於父母慚愧心微，雖害父母而非無間。諸天、地獄一向化生，無父母故不別料簡。

Regarding "By this it has already been explained ... but it is not uninterrupted": this provides an analogous explanation. Ghosts and animals receive little kindness from their parents, and their shame and conscience toward their parents are feeble; although they kill their parents, it is not an uninterrupted [offense]. Devas and hell-beings are exclusively of apparitional birth (upapāduka) and have no parents; therefore, they are not separately distinguished here.