The portion of the dorsal nerve cord in the collar region of Balanoglossus is the dorsal tubular nerve cord.
2.
The five coelomic cavities of Balanoglossus constituting the trisegmental condition are also found in an embryonic stage of Amphioxus.
3.
The chordates are metamerically segmented animals while Balanoglossus retains in adult stage, the trisegmental character of their larvae.
4.
Taking up embryology, he went to the United States to investigate the development of " Balanoglossus ".
5.
Eschscholtz was the first naturalist to describe the acorn worm ( Balanoglossus ), which he encountered in the Marshall Islands in 1825.
6.
Most acorn worms range from in length, with the largest species, " Balanoglossus gigas ", reaching or more.
7.
A unique endemic species of Balanoglossus Ptychodera fluva, a living fossil that links invertebrates and vertebrates, has been recorded only at Kurusadai.
8.
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.
9.
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.
10.
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.
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