Chelicerates were originally predators, but the group has diversified to use all the major feeding strategies : predation, parasitism, herbivory, evolved independently in insects.
22.
The evidence for this relationship between myriapods and chelicerates derives from comparisons of nuclear ribosomal RNA genes, mitochondrial ribosomal RNA genes, and protein-coding genes.
23.
More recent molecular studies, however, favour grouping the myriapods with crustaceans and insects, rather than with the chelicerates, to make up the clade Mandibulata.
24.
The chelicerata originated as marine animals, possibly in the Cambrian period, but the first confirmed chelicerate fossils, eurypterids, date from in the Late Ordovician period.
25.
On the other hand, there are over 77, 000 well-identified species of air-breathing chelicerates, and there may be about 500, 000 unidentified species.
26.
The reason for this is that it seems the appendages called chelifores are unique among extant arthropods, and are not homologous to the chelicerae in real chelicerates as previously supposed.
27.
In spiders and other chelicerates, there is only one pair of appendages before the mouth, and in spiders these are modified into fangs that inject poison into the prey.
28.
In chelicerates, the leg-bearing segments are fused with the anterior segments to form a prosoma, so that in living arthropods a distinct head only exists in mandibulates.
29.
These are related as shown below . ( Pycnogonida ( sea spiders ) may be excluded from the chelicerates, which are then identified as the group labelled " Euchelicerata " .)
30.
The guts of most modern chelicerates are too narrow for solid food, and they generally liquidize their food by grinding it with their chelicerae and pedipalps and flooding it with digestive enzymes.
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