Eighteen Sects. These are. the Aryasarvasti vadins who subdivided into the Kas'yapiyas, Mahishasakas, Dharma guptas, Bahushrutiyas, Tamrasatiyas, Vibhajyavadins, and Mula sarvastivadins, the Aryasammitiya who subdivided into the Kauru kullikas, Avantakas and Vatsiputriyas, the Aryamahasamghikas who subdivided into the Purvashailas, Uttarashailas, Haimavatas, Lokottaravadins, and Prajnaptivadins, and the Aryasthavira sect who subdivided into the Mahaviharavadins, Jetavaniyas and Abhayagiri vadins. See Blue Annals, pp. 27-33