PARENTAL CARE IN THE MEMBERS OF CLASS AMPHIBIA

Written by Friday, 30 June 2017 20:28
Amphibian include anurans, urodelans and apodans. In all these groups of amphibians we come across with a great deal of parental care. Amphibians show several mechanisms to protect their eggs…

PAEDOGENSIS OR NEOTENY IN AMPHIBIANS

Written by Friday, 30 June 2017 20:03
Neoteny is defined as the failure or delay of larva to metamorphose while becoming sexually mature. It is character of some amphibians.   The best example is axolotl larva of…

CLASSIFICATION OF AMPHIBIA

Written by Friday, 30 June 2017 18:39
Based on characters of amphibians the present day (extant) amphibians are classified Into 3 orders.   Order 1. Anura - (Frogs and Toads) Order 2. Urodela - (Salamanders) Order 3.…

GENERAL CHARACTERS OF AMPHIBIA

Written by Friday, 30 June 2017 18:22
Amphibians are cold blooded vertebrates. In the Devonian period of palaeozoic era they were originated from fishes, in the carboniferous period, they increased their number, hence that period is called…

AN INTRODUCTION TO AMPHIBIANS

Written by Friday, 30 June 2017 18:07
Amphibians are the earliest tetrapods. They were descended from fish like ancestors. They were developed in the Devonian period. They flourished during carboniferous period. It is called “Age of Amphibians”.…

AMPULIAE OF LORENZINI IN FISHES

Written by Friday, 30 June 2017 17:55
On the upper and lower surfaces of the head a number of tin- branched structures are present. They are called ampullae of lorenzini. Each ampulla contains two parts.   Expanded…

INTERNAL EAR OF SHARK (OR) MEMBRANOUS LABRYTH

Written by Friday, 30 June 2017 17:19
It lies in the auditory capsule of the skull. It is useful for maintenance of equilibrium. In the fish external and middle ears are absent. Internal eats covered by cartilaginous…

CLASPERS IN SHARKS

Written by Friday, 30 June 2017 16:50
In male shark claspers are present. The claspers are rod like copulatory organs present on the inner borders of the pelvic fins. They are supported by carfilages. Each clasper has…

OLFACTORY LOBES IN SHARKS

Written by Friday, 30 June 2017 16:31
In Scoliodon the olfactory lobes are olfactory organs or nasal sacs.   They are present in the olfactory sacs of cranium. They develop from the ectoderm. They open out through…
On the lateral sides of think and tall lateral line canals are present. They are present deeply In the dermis. In the head region there are connected by transverse canals.…
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CHOLERA: CAUSES, SYMPTOMS, DIAGNOSIS AND TREATMENT

CHOLERA: CAUSES, SYMPTOMS, DIAGNOSIS AND TREATMENT

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

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