. Dwellers of the sea and shore . unlike that of the familiar terrestrial isopod crustacean called the "sow bug." After the manner of the sow bug it was able to roll itself up into a ball, and in this posi- tion its fossil has often been found. Formerly the two were thought to be related, but, notwithstanding cer- tain of its crustacean characteristics, the trilobite has in recent years been classified with the Arachnida, a group including the spiders and scorpions. The truth

• Contributor: The Bookworm Collection / Alamy Stock Photo
• Image ID: MAAYDM
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• Dimensions: 2759 x 1811 px | 23.4 x 15.3 cm | 9.2 x 6 inches | 300dpi

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