| 21. | The midgut ( mesenteron ) is the largest organ in harvestmen and fills most of the opisthosoma.
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| 22. | In the female the abdomen ( opisthosoma ) is large and spherical, with two small holes.
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| 23. | The three rear eye pairs have black surrounds with white squamose hairs, the opisthosoma is pale yellow.
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| 24. | Tarantulas, like almost all other spiders, have their primary spinnerets at the end of the opisthosoma.
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| 25. | The tarantula s heart is a long slender tube that is located along the top of the opisthosoma.
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| 26. | The opisthosoma is yellowish or reddish, with a dark brown pattern consisting of spots on the back.
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| 27. | In other chelicerates, such as spiders, the mesosoma is fused with the metasoma to form the opisthosoma.
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| 28. | Sometimes the opisthosoma has two large white spots or one dark brown light-edged spot on the back.
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| 29. | The poliocherids are more like modern ricinuleids in having an opisthosoma with a series of three large, divided tergites.
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| 30. | In both sexes, the single gonad lies next to the intestine and opens on the underside of the opisthosoma.
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