English: From Knowledge. A typical Thysanuran (Machilus maritima). Female, ventral view. Mx1, Mx2, 1st and 2nd maxillae. ii.-x., Appendages on 2nd to 10th abdominal segments. The eversible sacs on the abdominal segments are shown, some protruded and some retracted. Ovp, Ovipositor. Mn, Mandible, and Mxl, maxillula, dissected out of head. Illustration from 1911 Encyclopædia Britannica, article Aptera.
This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
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