pelecaniformes वाक्य
उदाहरण वाक्य
मोबाइल
- Tropicbirds were traditionally grouped in the gannets and boobies and frigatebirds; in the Sibley-Ahlquist taxonomy, the Pelecaniformes were united with other groups into a large " Ciconiiformes ".
- In response to these findings, the International Ornithological Congress ( IOC ) recently reclassified Ardeidae and their sister taxa Threskiornithidae under the order Pelecaniformes instead of the previous order of Ciconiiformes.
- Molecular studies have consistently shown that pelicans, the namesake family of the Pelecaniformes, are actually more closely related to herons, order comprising the frigatebirds and Suloidea was renamed Suliformes in 2010.
- The Pelecaniformes in particular have a distinct hook or " nail " on the billtip, which is even present in the otherwise plesiomorphic bill of the hammerkop ( " Scopus umbretta " ).
- The classification of this group as the traditional Pelecaniformes, united by feet that are totipalmate ( with all four toes linked by webbing ) and the presence of a gular pouch, persisted until the early 1990s.
- Long thought to be related to frigatebirds, cormorants, tropicbirds, gannets and boobies, pelicans instead are now known to be most closely related to the shoebill and hamerkop, and are placed in the order Pelecaniformes.
- In any case, this species ( as well as " Torotix " ) seem to have been seabirds, most probably relatives of the Procellariiformes and / or some lineage of the paraphyletic " Pelecaniformes ".
- But pelicans, the namesake family of the Pelecaniformes, are actually closer related to herons, Phalacrocoraciformes, which also includes the frigatebirds ( Fregatidae ) as well as one or more prehistoric lineages that are entirely extinct today.
- Most unrecognised pelagornithid bones were initially assigned to " higher waterbird " families however, typically to the ( then-paraphyletic ) " Pelecaniformes ", but in particular the tarsometatarsus was typically mistaken for that of a procellariiform.
- Martyn Kennedy and colleagues derived a cladogram based on behavioural characteristics of the traditional Pelecaniformes, calculating the frigatebirds to be more divergent than pelicans from a core group of gannets, darters and cormorants, and tropicbirds the most distant lineage.
- Found in the much-debated Hornerstown Formation which straddles the Cretaceous Paleogene boundary 66 million years ago, this animal was apparently closely related to the ancestor of some modern birds, such as Procellariiformes and / or " Pelecaniformes ".
- Historically these birds were placed at different parts of the tree, with tropicbirds in Pelecaniformes and the kagu and sunbittern in Gruiformes, though in the last decade various genetic analysis had found in the almost obsolete clade Metaves of uncertain placement within that group.
- Fregatidae ( frigatebirds ), Sulidae ( gannets and boobies ), Phalacrocoracidae ( cormorants and shags ), Anhingidae ( darters ) and the Phaethontidae ( tropicbirds ) were traditionally placed in the Pelecaniformes, but molecular and morphological studies indicate they are not such close relatives.
- As regards " Pelecaniformes ", the analysis does not recover the correct phylogeny and does not include the shoebill ( " Balaeniceps rex ", a " missing link " between pelicans and storks ) either; clearly, the adaptive radiation of the pelican-stork lineage is misleading the analysis here.
- As their relationships are still unresolved between Galloanserae and " higher waterbirds ", the pseudotooth birds are here placed in the distinct order "'Odontopterygiformes "'as a compromise, rather than in a pelecaniform / ciconiiform or anseriform suborder Odontopterygia or even a family of the Anseriformes, Ciconiiformes or Pelecaniformes.
- As a zoology lecturer, he amused and inspired thousands of Aberdeen University students over many years with his'skypointing'and'beak fencing'. " He was the author of an authoritative 1, 000-page monograph on boobies and gannets, including a volume on " Pelecaniformes " and a more general volume on seabird biology and ecology.
- In 1874, English zoologist Alfred Henry Garrod published a study where he had examined various groups of birds and recorded which muscles of a selected group of five { { efn | 1 = ambiens, fermorocaudal, accessory femorocaudal, semitendinosus, and accessory tendinosus Urless N . Lanham observed in 1947 that frigatebirds bore some skeletal characteristics more in common with Procellariiformes than Pelecaniformes, though concluded they still belonged in the latter group ( as suborder Fregatae ), albeit as an early offshoot.
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