Neoteny in Amphibians In some amphibians, the larva becomes sexually mature without metamorphoses or delayed metamorphoses. In some amphibians, the character of neoteny is shown as the failure or delay of the larva to metamorphose while becoming sexually mature. Neoteny emphasizes the retention of embryonic or larval features in the Read more…
Parental Care in Amphibians Definition of Parental Care: Parental care can be defined as the activities that are directed by an animal towards the protection and maintenance of its own offspring or those of a near relative. Parental Care in Amphibians: In comparison to birds and mammals, little parental care Read more…
General Characters of Uromastyx Introduction: The Uromastyx is a genus of African and Asian agamid lizards. These are commonly called spiny-tailed lizards, uromastyces, mastigure, or dab lizards. Lizards of genus Uromastyx are primarily herbivorous, but occasionally they eat insects, especially young lizards. They are mostly found in hilly, rocky areas Read more…
Petromyzon (Lamprey): General Characters Introduction: Lampreys are Anadromous or freshwater, Eel-shaped jawless fishes. They can be readily recognized by the large, rounded sucker which surrounds their mouth and by the single nostril on the top of their head. Systemic position of Petromyzon: Phylum: Chordata Sub Phylum: Vertebrata Group: Agnatha Class: Read more…
Frog- Rana tigrina (Amphibian) A frog is an amphibian, living both on land and water. Amphibians are the first group of chordates that lived outside water. These are coldblooded vertebrates tetrapods. Classification of Rana tigrina (Frog): Phylum – Chordata Subphylum – Gnathostomata Superclass- Tetrapoda Class- Amphibia Order- Anura Genus- Rana Read more…
Parental Care in Fishes We can define parental care as an association between parents and the offspring through which the chance of survival of young ones gets increased or any behaviour performed by parents that appears likely to improve the survival and reproduction of the young. In the case of Read more…
Scales in Fishes The term Scale is derived from the Old French “escale” meaning a shell pod or husk. Fish Scale Fish scales are part of the Fish’s integumentary system, and these are originated from the Mesoderm layer of the dermis. A fish scale can be defined as the rigid Read more…
Migration in Fishes Many fishes migrate on a regular basis, on a time scale ranging from daily to annually or longer. It may be of short distance over a few meters to thousands of kilometers. Reason for Migration in Fishes: Fishes usually migrate to feed, to reproduce, or in some Read more…
Scoliodon – Dogfish, Classification, and Characteristics The Scoliodons commonly called dogfishes are the requiem sharks in the family Carcharchinidae. These are found mainly in the Indo-West Pacific oceans from the western coasts of Africa to the south of Japan. Scientific classification of Scoliodon: Systemic Position of Scoliodon Phylum Chordate Subphylum Read more…
Herdmania- Sea Squirts Systematic position of Herdmania Kingdom- Animalia Phylum- Chordata Sub Phylum – Urochordata, Tunicata Class- Acidiacea Order- Pleurogona Suborder- Stolidobranchia Family – Pyuridae Genus- Herdmania Habit and Habitat: Herdmania is a sedentary filter-feeding tunicate found in marine habitats. The animal often occurs in a gregarious form. These are Read more…