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Chelicerata split from Mandibulata by the mid-Cambrian, as evidenced by stem-group chelicerates like Habeliida and Mollisonia present by this time. [2] The surviving marine species include the four species of xiphosurans (horseshoe crabs), and possibly the 1,300 species of pycnogonids (sea spiders), if the latter are indeed chelicerates. On the ...
The jumping spider Phidippus audax.The basal parts of the chelicerae are the two iridescent green mouthparts. The chelicerae (/ k ə ˈ l ɪ s ər iː /) are the mouthparts of the subphylum Chelicerata, an arthropod group that includes arachnids, horseshoe crabs, and sea spiders.
The subphylum Mandibulata constitutes one of the major subdivisions of the phylum Arthropoda, alongside Chelicerata. Mandibulates include the crustaceans , myriapods ( centipedes and millipedes ), and all true insects .
The authors favoured relationships shown by more slowly evolving genes, which demonstrated the monophyly of Chelicerata, Euchelicerata and Arachnida, as well as of some clades within the arachnids. The diagram below summarizes their conclusions, based largely on the 200 most slowly evolving genes; dashed lines represent uncertain placements.
Chelicerata stubs (1 C, 52 P) Pages in category "Chelicerates" The following 2 pages are in this category, out of 2 total. This list may not reflect recent changes. ...
Toggle Subphylum Chelicerata subsection. 2.1 Class Xiphosura. 2.2 Class †Eurypterida. 2.3 Class Arachnida (Arachnids) 2.4 Class Pycnogonida.
Arthropoda: divided into subphyla Trilobitomorpha, Chelicerata, Myriapoda, Hexapoda and Crustacea, Brachiopoda: divided into subphyla Linguliformea, Craniformea and Rhynchonelliformea, Chordata: divided into Tunicata, Cephalochordata, and its largest subphylum Vertebrata. Examples of infraphyla include the Mycetozoa, the Gnathostomata and the ...
The earliest insects had chewing mouthparts. Specialisation includes mouthparts modified for siphoning, piercing, sucking and sponging. These modifications have evolved a number of times. For example, mosquitoes and aphids both pierce and suck; however, female mosquitoes feed on animal blood whereas aphids feed on plant fluids. This section ...