Zoology

Herdmania is a hermaphrodite animal. The fertilised eggs undergo holoblastic unequal clevage and it develops…
During metamorphosis the larva will loose all the chordate characters and attains an invertebrate like…
In the test of Herdmania two types of calcareous spicules are Present. They are:  …
A neural gland is present above the brain in herdmaina. It is brown in colour.…
Herdmania shows brain or nerve ganglion. It is 4 mm long. It is present in…
Herdmania is a simple ascidian, In Indian ocean this genus is represented by 4 species.…
The typical tunicate looks like a non-chordate animal. If the life history of such animal…
Subphylum Urochordata is divided into three classes.   CLASS 1.  ASCIDIACEA CLASS 2. THALIACEA CLASS…
The tunicates were first regarded as sponges. Lamark in 1816 placed Tunicata in between the…
The development of organ system is called as Organogeny. In Amphioxus the gastrula elongates in…
FATEMAP OF FERTILISED EGG OF AMPHIOXUS: Conklin in 1932 studied the fate map of Amphioxus.…
Amphioxus is a Cephalochordate animal. Its Life history in the early stages shows resemblance with…
In amphioxus a big space is present, called Atrium it is lined by ectoderm. It…
In the Urochordate and Cephalochordate animals the ventral side of the pharyhx wilI contains endostyle.…
In chordate animals notochord, dorsal tubular nerve cord and pharyngeal slits are present.   In…
Exoskeleton is absent in Branchiostama. Endoskeleton include the notochord, gelatinous rods and plates, fin-ray boxes…
Amphioxus belongs to Cephalochordate. In 1778 Amphioxus was first discovered and described by Palias. He…
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