English: Diagram illustrating different mechanisms of neck retraction in the two suborders of turtles: the Cryptodira retract the neck in the vertical plane, the Pleurodira in the horizontal plane.
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Ian Alexander, diagrams based on Herrel, Anthony; Van Damme, Johan; Aerts, Peter (2008). "Cervical Anatomy and Function in Turtles". In Wyneken, Jeanette; Bels, V. L.; Godfrey, Matthew H. (eds.). Biology of Turtles. Boca Raton: CRC Press, p. 164.