urochordates造句

• Other zooplankton include cnidarians, urochordates, and annelids such as polychaetes.
• However, recent research have confirmed a position close to urochordates for Vetulicolians.
• It could have resembled the small group of Cambrian urochordate deuterostomes named Vetulicolia.
• Another researcher places them with the urochordates, based on putative affinity with the Phylum Chordata.
• Doliolid eggs hatch into swimming tadpole larvae, which are the common larval stage for other urochordates.
• The subphylum was at one time called "'Urochordata "', and the term "'urochordates "'is still sometimes used for these animals.
• Keratins ( also described as cytokeratins ) are polymers of type I and type II intermediate filaments, which have only been found in the genomes of chordates ( vertebrates, Amphioxus, urochordates ).
• The Cephalochordata is traditionally seen as a sister subphylum to the vertebrates, with which it is grouped together into a clade ( sometimes called Notochordata ) which in turn is the sister group to the simpler still basal subphylum of the chordates, while the sister group of the vertebrates are the tunicates, previously known as the urochordates.
• And I've always been told that all " higher " chordates ( so everything other than urochordates and cephalochordates ) develop a mesonephros, however i've also been told that only amphibians and fish have a mesonephros as the adult kidney, so which is it ? talk ) 23 : 23, 3 January 2008 ( UTC)
• Some question the relation to tunicates and larvaceans, as there is no evidence of segmentation in tunicates, larval or adult, that is comparable to segmentation in vetulicolians, that the anus of urochordates is within the atrium, while that of vetulicolians is positioned at the terminal end of the tail, and, perhaps most importantly, there is no exhalant siphon, or analogous structure, seen in vetulicolians.