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File:1911 Britannica-Arachnida-Sao hirsuta.png

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Summary

Description
English: From Korschelt and Heider, after Barrande.
Five Stages in the development of the trilobite Sao hirsuta.

A, Youngest stage.
B, Older stage with distinct pygidial carapace.
C, Stage with two free mesosomatic somites between the prosomatic and telsonic carapaces.
D, Stage with seven free intermediate somites.
E, Stage with twelve free somites; the telsonic carapace has not increased in size.
a, Lateral eye.
g, So-called facial “suture” (not really a suture).

p, Telsonic carapace.
Date
Source Encyclopædia Britannica Eleventh Edition, Vol. 2, Page 301
Author Encyclopædia Britannica, 1911

Licensing

Public domain 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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current02:34, 10 March 2015Thumbnail for version as of 02:34, 10 March 20152,346 × 2,400 (347 KB)Animalpartylarger, clearer
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