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.…

CLASSIFICATON OF PISCES (FISHES)

Written by Friday, 30 June 2017 00:44
The super class Gnathostomata includes craniates, in which one pair of the visceral arches is modified into this jaws. They how internal ear with three semi-circular canals and provided with…

GENERAL CHARACTERS OF FISHES (PIECES)

Written by Friday, 30 June 2017 00:12
Fishes are first evolved in silurian period of palaeozoic era. They increased their number in Devonian period. Devonian Period is Called Age of Fishes.   Fishes are first jawed vertebrates.…
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