balanoglossus การใช้

• The portion of the dorsal nerve cord in the collar region of Balanoglossus is the dorsal tubular nerve cord.
• The five coelomic cavities of Balanoglossus constituting the trisegmental condition are also found in an embryonic stage of Amphioxus.
• The chordates are metamerically segmented animals while Balanoglossus retains in adult stage, the trisegmental character of their larvae.
• Taking up embryology, he went to the United States to investigate the development of " Balanoglossus ".
• Eschscholtz was the first naturalist to describe the acorn worm ( Balanoglossus ), which he encountered in the Marshall Islands in 1825.
• Most acorn worms range from in length, with the largest species, " Balanoglossus gigas ", reaching or more.
• A unique endemic species of Balanoglossus  Ptychodera fluva, a living fossil that links invertebrates and vertebrates, has been recorded only at Kurusadai.
• According to Newman, Balanoglossus thus retains throughout life a larval organisation while Amphioxus and vertebrates have secondarily introduced metamerism by division of posterior coelom into a long scries of segments.
• The resemblances between Balanoglossus and true chordates in some adult structures and embryonic and larval stages show that the hemichordates and the true chordates are, without question, related, however distantly.
• The enterocoelic origin of coelom in Balanoglossus and Amphioxus is also of greater phylogenetic significance than the resemblances in the gill-slits, and so-called notochord and dorsal tubular nerve cord.
• ""'Balanoglossus " "'is an ocean-dwelling acorn worm ( Enteropneusta ) genus of great Ascidians or sea squirts, in that it possesses branchial openings, or " gill slits " . It has notochord in the upper part of the body and has no nerve chord.