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Appendix S1. Methods

Appendix S2. Glossary of terms

Fig. S1. Schematic of lobster circulation.

Fig. S2. Electron micrograph of the lobster heart.

Fig. S3. Transverse 1-μm Giemsa-stained histological section of the dorsal abdominal artery from lobster.

Fig. S4. Electron micrograph of the lobster aorta.

Fig. S5. Schematic of earthworm circulation.

Fig. S6. Transverse 5-μm H&E-stained histological section through the body of the earthworm.

Fig. S7. Transverse 1-μm Giemsa-stained histological section of the body wall of the earthworm.

Fig. S8. Electron micrograph of a small earthworm blood vessel.

Fig. S9. Electron micrograph of an earthworm blood vessel.

Fig. S10. Electron micrograph of an earthworm blood vessel with an amoebocyte adhering to the inner side of the lumen.

Fig. S11. Transverse 1-μm Giemsa-stained histological section of a blood vessel in the earthworm.

Fig. S12. Schematic of amphioxus circulation.

Fig. S13. Transverse 5-μm H&E-stained histological section through the pharynx of amphioxus.

Fig. S14. Transverse 1-μm Giemsa-stained histological section through the gills of amphioxus.

Fig. S15. Transverse 1-μm Giemsa-stained histological section through the mid-body region of amphioxus.

Fig. S16. Transverse 1-μm Giemsa-stained histological section of the hepatic vein in amphioxus.

Fig. S17. Transverse 1-μm Giemsa-stained histological section of the dorsal aorta in amphioxus.

Fig. S18. Electron micrograph of the contractile hepatic vein from amphioxus.

Fig. S19. Electron micrograph of a secondary gill bar in amphioxus.

Fig. S20. Electron micrograph of an amoebocyte adhering to the inner wall of the dorsal aorta in amphioxus.

Fig. S21. Electron micrograph of two tubule-filled granules in an amoebocyte from amphioxus.

Fig. S22. Schematic of hagfish circulation.

Fig. S23. Electron micrograph of a heart sinus in hagfish.

Fig. S24. Electron micrograph of a dermal capillary in hagfish.

Fig. S25. Electron micrograph of a a glomerular capillary in hagfish.

Fig. S26. Electron micrograph of an hepatic sinusoid in hagfish.

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