CLASSIFICATION OF AVES

Written by Saturday, 01 July 2017 17:28
Based on characters of  Aves Class is divided into 2 sub-classes. Sub class: i) Archeornithes and Subclass ii) Neornithes   1. Sub class Archeornithes:   In this subclass extinct birds…

GENERAL CHARACTERS OF BIRDS (AVES)

Written by Saturday, 01 July 2017 16:57
AN INTRODUCTION TO AVES (BIRDS)   Birds (AVES) are highly evolved vertebrates. In the Jurassic period of Mesozoic era the Birds first appeared. They evolved from Ornithischian dinosaurs of Reptilian…

JACOBSONS ORGANS (SENSE ORGANS) IN REPTILES

Written by Saturday, 01 July 2017 01:40
In Reptiles the “organs of Jacobson” are well developed sac like chambers. They lie below the nasal cavity and above the buccal cavity. Each organ is a blind pocket. It…

CARAPACE AND PLASTRON

Written by Saturday, 01 July 2017 01:22
The trunk of chelonia is enclosed by Shell which has two parts, a dorsal carapace and a flat ventral plastron, joined on the sides. This is called tortoise shell.  …

BITING MECHANISM OF A SNAKE

Written by Saturday, 01 July 2017 00:18
Snakes consisting Poison Apparatus by the contraction of digastric muscles in Poison Apparatus in snake the mouth is opened. Then the lower jaw moves forward. The sphenopterygoid muscles contract which…

POISON APPARATUS IN SNAKE

Written by Friday, 30 June 2017 23:55
It has a pair of poison glands, or ducts and a pair of fangs. The poison glands are present on the upper jaw. The poison glands are the superior labial…

CLASSIFICATION OF REPTILES

Written by Friday, 30 June 2017 21:58
Based on characters Reptiles is divided into Four sub class   ANAPSIDA PARAPSIDA DIAPSIDA SYNAPSIDA   1. Sub-class: Anapsida:   The skull of Reptiles are made by solid roof. In…

GENERAL CHARACTERS OF REPTILES

Written by Friday, 30 June 2017 21:25
AN INTRODUCTION TO REPTILES   In the carboniferous period of palaeozoic era “Reptiles” arose from Labyrinthodont Amphibians. In the Mesozoic era “Reptiles” dominated the entire world and that era is…

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…
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