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File talk:Basiliscus plumifrons (Caño Negro).jpg; File talk:Benny Trapp Griechischer Frosch Rana graeca.jpg; File talk:Benny Trapp Triturus macedonicus Griechenland.jpg; File talk:Bindenwaran 1.jpg; File talk:Blue Iguana on Wilderness Trail at QEII Botanic Park.jpg; File talk:Bombina bombina 1 (Marek Szczepanek) tight crop.jpg
Category talk:Early Cretaceous reptiles of Australia; Category talk:Early Cretaceous reptiles of Europe; Category talk:Early Jurassic plesiosaurs of Europe; Category talk:Early Jurassic reptiles of Europe; Category talk:Early Triassic reptiles of Europe; Category talk:Endemic amphibians of Mexico; Category talk:Endemic amphibians of the Iberian ...
Fertilization is the fusion of gametes to produce a new organism. In animals, the process involves a sperm fusing with an ovum, which eventually leads to the development of an embryo. Depending on the animal species, the process can occur within the body of the female in internal fertilization, or outside in the case of external fertilization.
Marine reptiles are reptiles which have become secondarily adapted for an aquatic or semiaquatic life in a marine environment. Only about 100 of the 12,000 extant reptile species and subspecies are classed as marine reptiles, including marine iguanas , sea snakes , sea turtles and saltwater crocodiles .
The term ichthyopsida means fish-face or fish-like as opposed to the Sauropsida or lizard-face animals (reptiles and birds) and the mammals. [6] The group representing an evolutionary grade rather than a clade , the term anamniote is now used as an informal way of denoting the physical property of the group, rather than as a systematic unit.
After internal fertilization and the habit of laying eggs in terrestrial environments became a reproduction strategy amongst the amniote ancestors, the next major breakthrough appears to have involved a gradual replacement of the gelatinous coating covering the amphibian egg with a fibrous shell membrane. This allowed the egg to increase both ...
Females store the sperm until ovulation and internal fertilization take place, usually just prior to deposition in the spring. [7] Before the eggs are deposited, male mudpuppies leave the nest. [ 6 ] Once ready, the female deposits the eggs in a safe location, usually on the underside of a rock or log. [ 7 ]
The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects (including butterflies and moths), the schistosome family of flatworms, and some reptiles, e.g. majority of snakes, lacertid lizards and monitors, including Komodo dragons.