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[38] The **Prajñāpanā Sūtra** states that since earth is the foundation of all living beings, **Pṛthvīkāyika**s (earth-bodied beings) were first considered. **Apakāyika**s (water-bodied beings) depend on earth, so they were considered next. Then, their opposites, **Agnikāyika**s (fire-bodied beings) were considered, as fire increases with contact with air. Therefore, **Vāyukāyika**s (air-bodied beings) were considered next, and air is recognized by the vibration of distant creepers, etc. Therefore, **Vanaspatikāyika**s (plant-bodied beings) were considered next.
[20] What are **Pṛthvīkāyika** beings? [20] **Pṛthvīkāyika**s are said to be of two types: **Suhuma Pṛthvīkāyika**s (subtle earth-bodied beings) and **Bādar Pṛthvīkāyika**s (coarse earth-bodied beings).
[21] What are **Suhuma Pṛthvīkāyika**s? [21] **Suhuma Pṛthvīkāyika**s are said to be of two types: **Paryāpta Suhuma Pṛthvīkāyika**s (sufficiently subtle earth-bodied beings) and **Aparyāpta Suhuma Pṛthvīkāyika**s (insufficiently subtle earth-bodied beings). This is the description of **Suhuma Pṛthvīkāyika**s.
[22] What are **Bādar Pṛthvīkāyika**s? [22] **Bādar Pṛthvīkāyika**s are said to be of two types: **Sahabādar Pṛthvīkāyika**s (smooth coarse earth-bodied beings) and **Kharabādar Pṛthvīkāyika**s (rough coarse earth-bodied beings).
[23] What are **Sahabādar Pṛthvīkāyika**s? [23] **Sahabādar Pṛthvīkāyika**s are said to be of seven types: (1) **Kiṇhamattiya** (black), (2) **Nīlamattiya** (blue), (3) **Lohiyamattiya** (red), (4) **Hālihattiya** (yellow), (5) **Sukillāmattiya** (white), (6) **Paṇḍumattiya** (pale), (7) **Paṇagattiya** (grey). This is the description of **Sahabādar Pṛthvīkāyika**s.