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Zoology

CLASSIFICATION OF UROCHORDATA

  • BS Media
  • | 07 Jul 2017
Subphylum Urochordata is divided into three classes.   CLASS 1.  ASCIDIACEA CLASS 2. THALIACEA CLASS…
Thursday, 06 July 2017 18:42

GENERAL CHARACTERS OF UROCHORDATA

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The tunicates were first regarded as sponges. Lamark in 1816 placed Tunicata in between the…
Thursday, 06 July 2017 18:11

ORGANOGENY IN AMPHIOXUS

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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.…
Thursday, 06 July 2017 16:35

REPRODUCTION IN AMPHIOXUS

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Amphioxus is a Cephalochordate animal. Its Life history in the early stages shows resemblance with…
Thursday, 06 July 2017 16:20

ATRIUM IN AMPHIOXUS

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In amphioxus a big space is present, called Atrium it is lined by ectoderm. It…
Thursday, 06 July 2017 16:07

ENDOSTYLE IN AMPHIOXUS

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In the Urochordate and Cephalochordate animals the ventral side of the pharyhx wilI contains endostyle.…
Thursday, 06 July 2017 15:53

NOTOCHORD IN AMPHIOXUS

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In chordate animals notochord, dorsal tubular nerve cord and pharyngeal slits are present.   In…
Thursday, 06 July 2017 15:40

SKELETON IN AMPHIOXUS

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Exoskeleton is absent in Branchiostama. Endoskeleton include the notochord, gelatinous rods and plates, fin-ray boxes…
Wednesday, 05 July 2017 12:18

EXTERNAL CHARACTERS OF AMPHIOXUS

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Amphioxus belongs to Cephalochordate. In 1778 Amphioxus was first discovered and described by Palias. He…
The sub-phylum Cephalochordata includes a single class Leptocardii, which has single family, Branchiostomidae. The family…
Tuesday, 04 July 2017 19:16

GENERAL CHARACTERS OF CEPHALOCHORDATA

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Cephalochordata includes two genera, 1. Asymmetron and 2. Branchiostoma (Amphioxus). Cephalochordates are small fish like…
Tuesday, 04 July 2017 12:31

CLASSIFICATION PHYLUM CHORDATE

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Phylum Chordate is divided into three Sub-Phyla.   SUB-PHYLUM: UROCHORDATA SUB-PHYLUM: CEPHALOCHORDATA SUB-PHYLUM: VERTEBRATA  …
Tuesday, 04 July 2017 11:43

BIOLOGY OF CHORDATES

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CHORDATES   The Phylum Chordate includes bilaterally symmetrical, metamerically segmented, triploblastic, enterocoelomate metazoans exhibiting hights…
Tuesday, 04 July 2017 11:28

GENERAL CHARACTERS OF CHORDATES

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The animal kingdom is divided into two sub-kingdoms:   Chordata Non-Chordata   GENERAL CHARACTRS OF…
Tuesday, 04 July 2017 11:12

ORIGIN OF CHORDATES

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THEORIES ABOUT ORIGIN OF CHORDATES   It is believed that Chordates have originated from invertebrates.…
In Eutherian mammals the embryo develops in the uterus of mother. The developing embryo will…
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