ORGANOGENY IN AMPHIOXUS

Written by Thursday, 06 July 2017 23:11
The development of organ system is called as Organogeny. In Amphioxus the gastrula elongates in the future anteroposterior direction and the blastopore comes nearer to the posterior end of the…
FATEMAP OF FERTILISED EGG OF AMPHIOXUS: Conklin in 1932 studied the fate map of Amphioxus. In 1962 Tunguntung described the egg of amphioxus 4 regions are clearly seen.   Clear…

REPRODUCTION IN AMPHIOXUS

Written by Thursday, 06 July 2017 21:35
Amphioxus is a Cephalochordate animal. Its Life history in the early stages shows resemblance with ascidians. HATSCHE’K WILSON. CONKLIN’ worked on the part of embryogenesis of Amphioxus. ‘CONKLINS’ work in…

ATRIUM IN AMPHIOXUS

Written by Thursday, 06 July 2017 21:20
In amphioxus a big space is present, called Atrium it is lined by ectoderm. It encloses pharynx, and part of intestine. It opens out through atriopore at 36 myotome in…

ENDOSTYLE IN AMPHIOXUS

Written by Thursday, 06 July 2017 21:07
In the Urochordate and Cephalochordate animals the ventral side of the pharyhx wilI contains endostyle. It is a glandular ciliated groove present on the floor of the pharynx. This contains…

NOTOCHORD IN AMPHIOXUS

Written by Thursday, 06 July 2017 20:53
In chordate animals notochord, dorsal tubular nerve cord and pharyngeal slits are present.   In Amphioxus notochord is a cylindrical rod extending the whole length of the body from anterior

SKELETON IN AMPHIOXUS

Written by Thursday, 06 July 2017 20:40
Exoskeleton is absent in Branchiostama. Endoskeleton include the notochord, gelatinous rods and plates, fin-ray boxes etc.   1. Notochord in Amphioxus: The notochord of Amphioxus is extending the whole length…

EXTERNAL CHARACTERS OF AMPHIOXUS

Written by Wednesday, 05 July 2017 17:18
Amphioxus belongs to Cephalochordate. In 1778 Amphioxus was first discovered and described by Palias. He called it a Molluscan animal. In 1834, it was described as a chordate animal by…
The sub-phylum Cephalochordata includes a single class Leptocardii, which has single family, Branchiostomidae. The family contains only two genera Branchiostoma and Asymmetron.   The subphylum - Cephalochordata includes Amphioxus or…

GENERAL CHARACTERS OF CEPHALOCHORDATA

Written by Wednesday, 05 July 2017 00:16
Cephalochordata includes two genera, 1. Asymmetron and 2. Branchiostoma (Amphioxus). Cephalochordates are small fish like animals which show Chordate characters. The notochord extends the entire length of the body. They…
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