1. Jackknife chelicera presents two different forms : orthognathous and labidognathous. 2. This kind of chelicera is rotated and occurs exclusively in the Araneomorphae spiders. 3. Unlike females, the males bear a pair of flagella, one on each chelicera . 4. Unlike other rastellum on the chelicera . 5. The cheliceras ( fangs ) bared. 6. Just before entering the chelicera , the duct enlarges to a muscle-invested ampulla and then constricts again. 7. In the accompanying photograph of a male solifugid, one flagellum is just visible near the tip of each chelicera . 8. The glands are connected to a small duct through which the venom is discharged via its fang-like chelicera . 9. This kind of chelicera occurs in the Liphistiomorphae and Mygalomorphae spiders and in the related orders Amblypygi, Schizomida, Thelyphonida. 10. However, the male pedipalp, chelicera and cephalothorax drawn by Proszynski ( 1984 ), and recently collected specimens indicate otherwise.
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