chelicerate sentence in Hindi
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- Chelicerates were originally predators, but the group has diversified to use all the major feeding strategies : predation, parasitism, herbivory, evolved independently in insects.
- 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.
- More recent molecular studies, however, favour grouping the myriapods with crustaceans and insects, rather than with the chelicerates, to make up the clade Mandibulata.
- 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.
- 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.
- 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.
- 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.
- 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.
- These are related as shown below . ( Pycnogonida ( sea spiders ) may be excluded from the chelicerates, which are then identified as the group labelled " Euchelicerata " .)
- 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.
- The "'Xiphosura "'are an chelicerates that includes a large number of extinct lineages and only four extant species in the family Limulidae, which includes the horseshoe crabs.
- 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.
- Color vision requires a number of opsin molecules with different absorbance peaks, and at least three opsins were present in the ancestor of chelicerates and pancrustaceans; members of both these groups today possess color vision.
- Mandibulates also differ by having antennae, and also by having three distinct body regions : head, thorax and abdomen . ( The cephalothorax ( or prosoma ) of chelicerates is a fusion of head and thorax .)
- Although " sea spiders " are not true spiders, or 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.
- Chelicerate head structures differ considerably from those of mandibulates ( i . e . insects, crustaceans and myriapods ); they possess eyes and a single pair of grasping appendages innervated from the brain, plus a labrum-like structure.
- The " stem-group arthropod " hypothesis is very widely accepted, but some trees suggest that the onychophorans may occupy a different position; their brain anatomy is more closely related to that of the chelicerates than to any other arthropod.
- However, a subsequent study using Hox gene expression patterns consistent with a developmental homology between chelicerates and chelifores, with chelifores innervated from a deuterocerebrum that has been rotated forwards; thus, the protocerebral Great Appendage clade does not include the Pycnogonida.
- ""'Cheliceratichnus " "', meaning trace of a chelicerate arthropod, is an ichnogenus erected by Dalman and Lucas ( 2015 ) for a body imprint discovered in the Lower Jurassic East Berlin Formation of Holyoke, Massachusetts.
- Many Cambrian arthropods, including the trilobites themselves, possess a single pair of slender antennae, which have been equated with either the first or second antennae of the crustaceans; and either the chelicerae or the missing appendages of the supposedly reduced deuterocerebrum in chelicerates.
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