File:1911 Britannica-Arachnida-Limulus polyphemus4.png

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1911_Britannica-Arachnida-Limulus_polyphemus4.png ‎（438 × 372 像素，檔案大小：123 KB，MIME 類型：image/png）

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English: Ventral view of the posterior carapace or meso-metasomatic (opisthospmatic) fusion of Limulus polyphemus. The soft integument and limbs of the mesosoma have been removed as well as all the viscera and muscles, so that the inner surface of the terga of these somites with their entopophyses are seen. The unsegmented dense chitinous sternal plate of the metasoma (XIII to XVIII) is not removed.
VII, Usually considered to be the tergum of the genital somite, but suggested by Pocock to be that of the otherwise suppressed praegenital somite.
VIII to XIII, The six somites of the mesosoma, each with a movable pleural spine and a pair of dorsal entopophysis or muscle-attaching ingrowths.
XIV to XVIII, The confluent or unexpressed six somites of the metasoma.
(After Ray Lankester, Quart. Journ. Micr. Sci., vol. xxi., 1881.)
日期
來源 Encyclopædia Britannica Eleventh Edition, Vol. 2, Page 290
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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