"কর্ডাটা" পাতাটির দুইটি সংশোধিত সংস্করণের মধ্যে পার্থক্য

সম্পাদনা সারাংশ নেই
ট্যাগ: মোবাইল সম্পাদনা মোবাইল ওয়েব সম্পাদনা দৃশ্যমান সম্পাদনা
ট্যাগ: মোবাইল সম্পাদনা মোবাইল ওয়েব সম্পাদনা
{{Annotation|200|305|19 {{=}} [[হেপাটিক সিকাম]] ([[যকৃৎ]]-সদৃশ অঙ্গ) }}
}}
 
* 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]].
* [[Pharyngeal slit]]s. The [[pharynx]] is the part of the [[throat]] immediately behind the mouth. In [[fish]] the slits are modified to form [[gills]], but in some other chordates they are part of a [[filter feeding|filter-feeding]] system that extracts particles of food from the water in which the animals live.
* A muscular tail that extends backwards behind the [[anus]].
* An [[endostyle]]. This is a groove in the [[Anatomical terms of location#Dorsal and ventral|ventral]] wall of the pharynx. In [[filter feeding|filter-feeding]] species it produces [[mucus]] to gather food particles, which helps in transporting food to the [[esophagus]].<ref name="Ruppert2005">{{সাময়িকী উদ্ধৃতি
| author=Ruppert, E. | journal=Canadian Journal of Zoology | volume=83 | pages=8–23 | year=2005
| doi = 10.1139/Z04-158
| title=Key characters uniting hemichordates and chordates: homologies or homoplasies?
| 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>.<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>
 
== তথ্যসূত্র ==
৭০টি

সম্পাদনা