Information om | Engelska ordet CHELICERATES

Exempel på hur man kan använda CHELICERATES i en mening

• Examples of exoskeletons in animals include the cuticle skeletons shared by arthropods (insects, chelicerates, myriapods and crustaceans) and tardigrades, as well as the skeletal cups formed by hardened secretion of stony corals and the prominent mollusc shell shared by snails, clams, tusk shells, chitons and nautilus.
• Pedipalps (commonly shortened to palps or palpi) are the secondary pair of forward appendages among chelicerates – a group of arthropods including spiders, scorpions, horseshoe crabs, and sea spiders.
• Although "sea spiders" are not true spiders, nor even arachnids, their traditional classification as chelicerates would place them closer to true spiders than to other well-known arthropod groups, such as insects or crustaceans, if correct.
• In most chelicerates the opisthosomal limbs are greatly reduced and persist only as specialized structures, such as the silk-producing spinnerets of spiders or the pectines of scorpions.
• Frequent chelicerates (arthropods) include trace and body fossils of xiphosurid merostomes and arachnids, including Phalangiotarbida and Trigonotarbida and also true spiders (Araneida).
• While the dispute has historically centered on the exact make-up of the insect head, it has been widened to include other living arthropods, such as chelicerates, myriapods, and crustaceans, as well as fossil forms, such as the many arthropods known from exceptionally preserved Cambrian faunas.
• Color vision requires a number of opsin molecules with different absorbance peaks, and at least three opsins were present in the ancestor of arthropods; chelicerates and pancrustaceans today possess color vision.
• Like all other chelicerates, and other arthropods in general, pterygotioid eurypterids possessed segmented bodies and jointed appendages (limbs) covered in a cuticle composed of proteins and chitin.
• They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates by the possession of biramous (two-parted) limbs, and by the nauplius form of the larvae.
• They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) limbs, and by their larval forms, such as the nauplius stage of branchiopods and copepods.
• It encompasses all chelicerates with prosomal uniramous appendages (appendages composed of a single series of segments attached end-to-end) in the adult stage (excluding the sixth and last pair of appendages).
• The metastoma is a ventral single plate located in the opisthosoma of non-arachnid dekatriatan chelicerates such as eurypterids, chasmataspidids and the genus Houia.
• A wide variety including crustaceans, trilobites, chelicerates, and less familiar groups like thylacocephalans, cheloniellids and marrellomorphs are known.
• The abdomen apparently compose of 4 abdominal somites and a styliform telson, but based on the medial position of anus (which, in telson-bearing chelicerates, always located at the ventral boundary of abdomen and telson), the latter was also suggest to be a fusion of 5th abdominal somite and the original telson.
• Unlike the rest of Araneidae, the spiders of the American genus Metepeira are noted for their unique light eye region, white median line on their sternum, relative length of the leg segments, small male palpus (appendages of chelicerates), and the weakly sclerotized (hardened) epigynum in females.

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