Category: Chordates
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Migration of Fishes
Introduction In life history of some fishes, population needs, like foraging & reproduction, can’t be met in single habitat. So, they travel periodically from one habitat to another & back after meeting the requirement, termed as fish migration. Causes: Sexual maturity, hormonal changes, instinct, predators, competition, food, light, temperature, pH, water currents, turbidity etc. The…
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Osteichthyes (Bony Fishes) Classification
For Sub class 3: Branchiopterygii, check image above “Osteichthyes Overview”. Vertebrata Classification Agnatha Classification Chondrichthyes (Cartilagenous Fishes) Classification
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Chondrichthyes (Cartilaginous Fishes) Classification
Vertebrate Classification Agnatha Classification Osteichthyes (Bony Fishes) Classification
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Integumentary System (Skin and its derivatives)
Introduction The common structural pattern of both aquatic & terrestrial vertebrates of integument is… Epidermis Derived from Ectoderm Stratified i.e. consists of multi-layers of cells Dermis Derived mainly from mesoderm Formed of connective tissue Contain blood & lymph vessels, nerve & smooth muscle fibres, receptors and also special irregular pigment cells (chromatophores) Below dermis, subcutaneous…
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Vertebrate Comparative Part-I (Introduction)
This series of study material is based on comparative study of vertebrates. In order to learn thoroughly & clearly about vertebrates & comparative study of them, it is important to know the proper classification of Vertebrates. Basic aspects to be studied in comparative vertebrate anatomy are:(a) Descriptive Morphology (Structures of vertebrates)(b) Functional Morphology (Functional significance…
