Which of the following animal belongs to Urochordata?
Herdmania is a marine animal. They belongs to phylum Chordata. They are included in the sub phylum Urochordata. They are sedentary type of animals. They are fixed to the substratum or rock with the help of the flat base like structure. Whenever the organisms are disturbed, they suddenly contracts their body and emits inner contents with force through its apertures. So, they are commonly called as sea squirt. The larvae show retrogressive metamorphosis in which there is loss of advanced features while development to adult.
Thus, the correct answer is option A.
Which of the following statements are true for the phylum-Chordata? a) In Urochordata notochord extends from head to tail and it is present throughout their life. b) In Vertebrata notochord is present during the embryonic period only. c) Central nervous system is dorsal and hollow. d) Chordata is divided into 3 subphyla : Hemichordata, Tunicata and Cephalochordata.
In which among the following animals, retrogressive metamorphosis is found?
Statement 1: Cephalochordata bears notochord throughout their life. Statement 2: In cephalochordates, notochord extends from head to tail.
Retrogressive metamorphosis is found in
Why the Amphioxus is considered as degenerated chordata?
Excretory organ of Herdmania is
The larval form of urochordates is called as
Sapla and Doliolum belongs to
Urochordata, Hemichordata and Cephalochordata are collectively known as
Which of the following animal is devoid of notochord and nerve cord in it's adult stage?