The Compendium of Caraka 3.7.9

3.7.9

athāsmai provāca bhagavānātreyaḥ---iha khalvagniveśa! viṃśatividhāḥ krimayaḥ pūrvamuddiṣṭā nānāvidhena pravibhāgenānyatra sahajebhyaḥ; te punaḥ prakṛtibhirvibhajyamānāścaturvidhā bhavanti; tadyathā---purīṣajāḥ, śleṣmajāḥ, śoṇitajā, malajāśceti//

Then the venerable Ātreya said to him: "Here indeed, Agniveśa, twenty varieties of worms have previously been declared under various divisions, aside from the innate ones. They, in turn, when divided according to their origins, become of four kinds, namely: born from feces, born from phlegm, born from blood, and born from bodily excreta."