Xenoheilis

Xenoheilis is the Primal Zerg that eats the creature possibly another Primal Zerg trying to escape in the cinematic where Zeratul is explaining about Zerus and how Primal Zerg take essence to evolve to Kerrigan.

Below is a link to the only drawn pic of him that that is known of. https://www.google.ca/search?q=primal+zerg&safe=off&biw=1920&bih=916&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj_4q2f_8zPAhUDwmMKHV8EB80Q_AUIBigB#imgrc=LT0xN81404sD-M%3A