Zoology

  • Dayyal Dg.
  • | 11 Feb 2018
TORSION   Torsion is a process in which the viscero-pallium rotates anti-clockwise through 180° from…
Tuesday, 06 February 2018 14:42

PROCESS OF FORMATION OF PEARL IN MOLLUSCS

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The “pearl” is literally formed by the mantle epithelium, which becomes deposit around any external…
The pectoral girdle is connected to the vertebral column through muscles and ligaments. The pectoral…
The skeletal system or skeleton includes the hard parts of the animal body. All the…
Comparative anatomy of respiratory systems in calotes (lizard), columba (pigeon) and oryctolagus (rabbit). Calotes is…
Scoliodon (fish) is a poikilothermic cartilaginous fish. It is commonly known as shark. Rana (frog)…
Digestive System Of Bird: Eg: Pegion Digestive System (Columba) Digestive System Of Mammal: Eg: Rabbit…
Comparison Of Integument Derivatives In Calottes (Reptile), Columba (Bird) And Oryctolagus (Mammal) Calotes is a…
COMPARATIVE ACCOUNT OF THE INTEGUMENT (SKIN) IN THE SCOLIODON (SHARK FISH) AND RANA (FROG) Scoliodon…
Friday, 07 July 2017 19:17

GONADS OF HERDMANIA

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Herdmania is a bisexual animal. It is a protogynous animal. Ovary matures’ first. Hence cross…
Friday, 07 July 2017 19:03

ORGANISATION OF HERDMANIA TADPOLE LARVA

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Herdmania is a hermaphrodite animal. The fertilised eggs undergo holoblastic unequal clevage and it develops…
Friday, 07 July 2017 14:47

RETROGRESSIVE METAMORPHOSIS IN HERDMANIA

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During metamorphosis the larva will loose all the chordate characters and attains an invertebrate like…
Friday, 07 July 2017 14:32

HERDMANIA: SPICULES IN THE TEST

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In the test of Herdmania two types of calcareous spicules are Present. They are:  …
Friday, 07 July 2017 13:44

EXCRETORY ORGAN OF HERDMANIA

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A neural gland is present above the brain in herdmaina. It is brown in colour.…
Friday, 07 July 2017 13:29

NERVOUS SYSTEM OF HERDMANIA

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Herdmania shows brain or nerve ganglion. It is 4 mm long. It is present in…
Friday, 07 July 2017 13:09

EXTERNAL CHARACTERS OF HERDMANIA

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Herdmania is a simple ascidian, In Indian ocean this genus is represented by 4 species.…
Friday, 07 July 2017 12:08

AFFINITIES OF UROCHORDATES

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The typical tunicate looks like a non-chordate animal. If the life history of such animal…
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