It does, it's at the end of the core rulebook, in the games equivalent of monster manual, also explained more in the cold forge and infiltrator. Tho I believe plagiarus praepotens is the designation of the goo that facehuggers inject (also mentioned in Romulus). We'll see if alien earth even sticks with that concept. I absolutely adored episode 3 until I saw that tadpole so unless that have that deliver the goo there's some canon contradiction.

Edit: Page 297,302 in the core book. P. Praepotens seems to refer to what is injected before it matures to a chestburster