How To Use Chelicera In A Sentence
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More problematic are the relationships of the four major groups, hexapods (including insects), crustaceans, myriapods (including centipedes and millipedes), and chelicerates (including spiders).
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As defined by Collins, Dinocarids are bilaterally symmetrical arthropods with a body divided into two principal tagmata, recalling the prosoma and opisthosoma of chelicerates, and a non-mineralised cuticle.
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Cheliceramorphs are distinguished by having a body divided into two main divisions, technically called the prosoma and the opisthosoma.
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The chelicerate body plan is characterized by two tagmata, the prosoma, including head structures, and the opisthosoma.
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The chelicerate body plan is characterized by two tagmata, the prosoma, including head structures, and the opisthosoma.
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However, familiarity with potential prey items greatly enhances recognition of even soft-bodied prey from diagnostic indigestible body parts such as wings, elytra, mandibles, or chelicerae.
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Hemocyanins have been studied thoroughly only in the Chelicerata and the malacostracan Crustacea, but they have been identified in all arthropod subphyla, including the Myriapoda and Hexapoda.
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Larval mites have a short gnathosoma with stocky pedipalps on either side of paired chelicerae.
Arthropoda
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Some arachnid chelicerates are parasites, such as ticks and mites.
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Attached to the prosoma are the bird eater's eight legs, their pedipalps and two chelicerae's.
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Continue reading "Chelifores, chelicerae, and invertebrate evolution" on Pharyngula
Chelifores, chelicerae, and invertebrate evolution - The Panda's Thumb
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In contrast, myriapods and chelicerates mostly lack compound eyes and the ommatidia of the few groups that have compound eyes are very different from insect/crustacean ommatidia.
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All members of this subphylum have chelicerae and pedipalps as their first and second prosomal appendages.
Arthropoda
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In true spiders, the chelicerae are modified into fangs with poison glands, while the pedipalps of the males are modified for copulation.
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Hemocyanin is the only respiratory protein available to the Chelicerata and the Myriapoda, while in the Crustacea, either hemocyanin or hemoglobin occurs.
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Chelicerates are characterized by a pair of chelate preoral appendages and a body divided into two tagmata, the prosoma and opisthosoma.
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Major arthropod lines have long been recognized (insects, crustaceans, chelicerates, diplopods, chilopods, etc.), but the phylogenetic relationships among these groups remain controversial.
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The chelicerate hemocyanin subunits are basal, consistent with the assumption that the Chelicerata is a rather distinct arthropod taxon.
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Her jaws widened, and from between her lips her spider chelicerae emerged, two appendages ending in hollow points, each loaded with poison.
The Gates
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Still other chelicerates are tiny organisms which feed on detritus, the bits of decaying matter that accumulate on and below the ground.
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All chelicerate arthropods have this special first set of modified legs.
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Insects are mandibulate, not chelicerate arthropods, like spiders.
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The chelicerate body plan is characterized by two tagmata, the prosoma, including head structures, and the opisthosoma.
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This is the tactic used by scorpions, another group of chelicerate predators.
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Some arachnid chelicerates are parasites, such as ticks and mites.
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The chelicerae (first appendages) may be clawed mouthparts or may be modified for piercing, as in ticks.
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After reaching maturity, deutonymphs find a plant or soft substrate, embed their chelicerae and transform into another inactive stage, which emerges as an adult in a few days.
Arthropoda
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Arthropods have traditionally been divided into four classes: Trilobita, Chelicerata, Crustacea, and Uniramia.
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Whilst insects are defined as having three fused body sections, the chelicerates have two.
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However, a new report by Jager et al. suggests that that interpretation may be flawed, and that sea spider chelifores are actually homologous to the chelicerae of spiders.
The Panda's Thumb: May 2006 Archives
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The Chelicerates include among their number both the tiniest (the microscopic Acari or mites) and the hugest (the giant Paleozoic Eurypterida) of all the Arthropoda.
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Major arthropod lines have long been recognized (insects, crustaceans, chelicerates, diplopods, chilopods, etc.), but the phylogenetic relationships among these groups remain controversial.
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There is no eye streak above their anterior eyes, as seen in SR males, but the chelicerae are striped.
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The legs, pedipalps and chelicerae are pulled free from the skin with rhythmic movements until finally the spider pulls free.
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To overcome this problem, we used numerous representatives of each: four crustaceans, three myriapods, and even a chelicerate.
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Generations of morphologists have been unable to determine the branching order of Chelicerata, Myriapoda, Crustacea and Insecta.
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Phylogenetic analyses of a wide variety of gene sequences all support the hypothesis that hexapods and crustaceans form a monophyletic group to the exclusion of myriapods and chelicerates.
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Another feature of the diagram above and an important character for the chelicerates are the mouthparts.
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Although they have weak chelicerae, they secrete extremely potent venom, which enables them to attack insects 2-3 times their size.
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All chelicerate arthropods have this special first set of modified legs.
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In all cases, the two chelicerate species form a clade which is quite distinct from a Hexapoda / Crustacea clade.
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The front pair of appendages, the chelicerae, are the ones which contain the poison glands.
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They may represent a very early branching of the chelicerate lineage.
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In some chelicerates, such as scorpions and some eurypterids, the pedipalps are modified into large claws.
