نتایج جستجو برای: vertebrata
تعداد نتایج: 162 فیلتر نتایج به سال:
Craniates (which include the sister taxa vertebrata and hyperotreti, or hagfishes) represent the most complex organisms in the chordate phylum, particularly with respect to the organization and function of the central nervous system. How brain complexity has arisen during evolution is one of the most fascinating questions facing modern science, and it speaks directly to the more philosophical q...
Many new higher-ranked taxa are currently recognized by taxonomists as a result of the numerous phylogenetic hypotheses which are regularly published. The absence in the Code of Rules for the nomenclature of taxa above the rank superfamily (class-series nomenclature) is a factor of growing chaos in zoological taxonomy. This is why Dubois (2005) proposed a set of formal Rules for this nomenclatu...
The synarcual is a structure incorporating multiple elements of two or more anterior vertebrae of the axial skeleton, forming immediately posterior to the cranium. It has been convergently acquired in the fossil group 'Placodermi', in Chondrichthyes (Holocephali, Batoidea), within the teleost group Syngnathiformes, and to varying degrees in a range of mammalian taxa. In addition, cervical verte...
The cosmopolitan ascidian Ciona intestinalis is the most common model species of Tunicata, the sister-group of Vertebrata, and widely used in developmental biology, genomics and evolutionary studies. Recently, molecular studies suggested the presence of cryptic species hidden within the C. intestinalis species, namely C. intestinalis type A and type B. So far, no substantial morphological diffe...
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