21. The prosoma ( head ) is ovate, with compound eyes located near the edge of the front corners. 22. The prosoma ( head ) is subquadrate, with compound eyes located at the edge of the front corners. 23. "Ctenopterus " is distinguished by its prosoma ( head ), which narrows towards the front. 24. The eight legs, the two chelicerae with their fangs, and the pedipalps are attached to the prosoma . 25. The carapace which shields the prosoma also bears two pairs of eyes a pair of photoreceptors in the caudal spine. 26. The name means " split or cleaved middle ", referring to the way the prosoma is divided into two separate plates. 27. A pair of compound eyes is on the side of the prosoma , with one or two median ocelli towards the front. 28. The first type is located at the posterior tips of their cephalothorax ( the prosoma ) in the form of two triangular protrusions. 29. Moulting commences with a split in the old exoskeleton just below the edge of the carapace ( at the front of the prosoma ). 30. The alternative name " cephalothorax " reflects the fact that the prosoma includes the parts that in insects form the head plus the thorax.
