"কর্ডাটা" পাতাটির দুইটি সংশোধিত সংস্করণের মধ্যে পার্থক্য

সম্পাদনা সারাংশ নেই
ট্যাগ: মোবাইল সম্পাদনা মোবাইল ওয়েব সম্পাদনা দৃশ্যমান সম্পাদনা
ট্যাগ: মোবাইল সম্পাদনা মোবাইল ওয়েব সম্পাদনা দৃশ্যমান সম্পাদনা
{{Annotation|200|305|19 {{=}} [[হেপাটিক সিকাম]] ([[যকৃৎ]]-সদৃশ অঙ্গ) }}
}}
 
কর্ডাটারা form a [[phylum]] of creatures that are based on a bilateral [[body plan]]<ref>{{বই উদ্ধৃতি
| last = Valentine | first = J.W. | year = 2004 | title = On the Origin of Phyla
| publisher = University Of Chicago Press | location = Chicago | isbn = 0226845486
| page=7
}}"<cite>Classifications of organisms in hierarchical systems were in use by the seventeenth and eighteenth centuries. Usually organisms were grouped according to their morphological similarities as perceived by those early workers, and those groups were then grouped according to ''' their''' similarities, and so on, to form a hierarchy.</cite>"
</ref>, and is defined by having at some stage in their lives all of the following:<ref name="RychelSmithShimamotoSwalla2006">{{সাময়িকী উদ্ধৃতি
| author=Rychel, A.L., Smith, S.E., Shimamoto, H.T., and Swalla, B.J. | year=2006
| title=Evolution and Development of the Chordates: Collagen and Pharyngeal Cartilage
| journal=Molecular Biology and Evolution | issue=3 | pages=541–549 | doi=10.1093/molbev/msj055
| volume=23
| pmid=16280542
}}</ref>
* A [[notochord]], in other words a fairly stiff rod of [[cartilage]] that extends along the inside of the body. Among the vertebrate sub-group of chordates the notochord develops into the [[Vertebral column|spine]], and in wholly aquatic species this helps the animal to swim by flexing its tail.
* A [[Anatomical terms of location#Dorsal and ventral|dorsal]] [[neural tube]]. In fish and other [[vertebrate]]s this develops into the [[spinal cord]], the main communications trunk of the [[nervous system]].
| url=http://article.pubs.nrc-cnrc.gc.ca/RPAS/RPViewDoc?_handler_=HandleInitialGet&articleFile=z04-158.pdf&journal=cjz&volume=83
| accessdate=2008-09-22
}}</ref> It also stores [[iodine]], and may be a precursor of the vertebrate [[thyroid]] gland.<ref name="RychelSmithShimamotoSwalla2006">{{সাময়িকী উদ্ধৃতি|title=Evolution and Development of the Chordates: Collagen and Pharyngeal Cartilage|year=2006|pages=541–549|doi=10.1093/molbev/msj055|pmid=16280542|author=Rychel, A.L., Smith, S.E., Shimamoto, H.T., and Swalla, B.J.|journal=Molecular Biology and Evolution|issue=3|volume=23}}</ref>
{{clear}}
 
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