Comparison Of Integument Derivatives In Calottes (Reptile), Columba (Bird) And Oryctolagus (Mammal) Calotes is a terrestrial Reptile (lizard). Columba is flying bird. Oryctolagus is a herbivorous mammal. All these animals…
COMPARATIVE ACCOUNT OF THE INTEGUMENT (SKIN) IN THE SCOLIODON (SHARK FISH) AND RANA (FROG) Scoliodon and Rana are poikilothermic animals. Scoliodon is an aquatic cartilage fish. Rana lives in water…

GONADS OF HERDMANIA

Written by Saturday, 08 July 2017 00:17
Herdmania is a bisexual animal. It is a protogynous animal. Ovary matures’ first. Hence cross fertilization takes place.   Herdmania contains a pair of gonads. The left gonad lies in…

ORGANISATION OF HERDMANIA TADPOLE LARVA

Written by Saturday, 08 July 2017 00:03
Herdmania is a hermaphrodite animal. The fertilised eggs undergo holoblastic unequal clevage and it develops into blastula. it shows upper micromeres and lower macromeres. By invagination of the macromeres gastrulation…

RETROGRESSIVE METAMORPHOSIS IN HERDMANIA

Written by Friday, 07 July 2017 19:47
During metamorphosis the larva will loose all the chordate characters and attains an invertebrate like form. This type of metamorphosis, where highly advanced larval form ends in a lowly organised…

HERDMANIA: SPICULES IN THE TEST

Written by Friday, 07 July 2017 19:32
In the test of Herdmania two types of calcareous spicules are Present. They are:   Microscleres: These are 40 to 80 microns in length. They are minute. Megascleres: These are…

EXCRETORY ORGAN OF HERDMANIA

Written by Friday, 07 July 2017 18:44
A neural gland is present above the brain in herdmaina. It is brown in colour. It is present in the mantle. It is 4mm in diameter. It show branching tibuIes.…

NERVOUS SYSTEM OF HERDMANIA

Written by Friday, 07 July 2017 18:29
Herdmania shows brain or nerve ganglion. It is 4 mm long. It is present in the mantle in between the two siphons. A neural gland is present above the brain.…

EXTERNAL CHARACTERS OF HERDMANIA

Written by Friday, 07 July 2017 18:09
Herdmania is a simple ascidian, In Indian ocean this genus is represented by 4 species.   1. Herdmania pallida 2. H. ennurensis 3. H. mauritiana 4. H. ceylonica   Herdmania…

AFFINITIES OF UROCHORDATES

Written by Friday, 07 July 2017 17:08
The typical tunicate looks like a non-chordate animal. If the life history of such animal is studied, the larval form reveals the chordate characters of that animal. In 1816, Lamarck…
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CHOLERA: CAUSES, SYMPTOMS, DIAGNOSIS AND TREATMENT

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CHOLERA is a specific infectious disease that affects the lower portion of the intestine and is char...

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