File:1911 Britannica-Arachnida-Buthus occitanus.png

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1911_Britannica-Arachnida-Buthus_occitanus.png ‎（242 × 375 像素，檔案大小：94 KB，MIME 類型：image/png）

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描述
English: View from below of a scorpion (Buthus occitanus) opened and dissected so as to show the pericardium with its muscles, the lateral arteries, and the tergo-sternal muscles.

PRO, Prosoma.
dpm, Dorso-plastral muscle.
art, Lateral artery.
tsm1, Tergo-sternal muscle of the second (pectiniferous) mesosomatic somite; this is the most anterior pair of the series of six, none are present in the genital somite.
tsm4, Tergo-sternal muscle of the fifth mesosomatic somite.
tsm6, Tergo-sternal muscle of the enlarged first metasomatic somite.
Per, Pericardium.
VPM1 to VPM7, The series of seven pairs of veno-pericardiac muscles.

There is some reason to admit the existence of another more anterior pair of these muscles in Scorpio; this would make the number exactly correspond with the number in Limulus polyphemus.
(After Ray Lankester, Trans. Zool. Soc. vol. xi, 1883.)
日期
來源 Encyclopædia Britannica Eleventh Edition, Vol. 2, Page 296
作者 Encyclopædia Britannica, 1911

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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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