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Encyclopedia > Oviparity

Oviparous animals are animals that lay eggs, with little or no other embryonic development within the mother. This is the reproductive method of many fish, amphibians and reptiles, all birds, the monotremes, and most insects and arachnids. In most birds and reptiles, an egg (Latin ovum) is the zygote, resulting from fertilization of the ovum. ... It has been suggested that embryology be merged into this article or section. ... Biological reproduction is the biological process by which new individual organisms are produced. ... A giant grouper at the Georgia Aquarium Fish are aquatic vertebrates that are typically cold-blooded; covered with scales, and equipped with two sets of paired fins and several unpaired fins. ... For other uses, see Amphibian (disambiguation). ... Subclasses Anapsida Diapsida Synonyms Reptilia Laurenti, 1768 Reptiles are tetrapods and amniotes, animals whose embryos are surrounded by an amniotic membrane, and members of the class Sauropsida. ... “Aves” redirects here. ... Families †Kollikodontidae Ornithorhynchidae Tachyglossidae †Steropodontidae Monotremes (monos, single + trema, hole; refers to the cloaca) are mammals that lay eggs instead of giving birth to live young like marsupials (Metatheria) and placental mammals (Eutheria). ... Insects (Class Insecta) are a major group of arthropods and the most diverse group of animals on the Earth, with over a million described species—more than all other animal groups combined. ... Extant orders Acarina Amblypygi Araneae Opiliones Palpigradi Pseudoscorpionida Ricinulei Schizomida Solifugae Uropygi Arachnids are a class (Arachnida) of joint-legged invertebrate animals in the subphylum Chelicerata. ...


Land-dwelling animals that lay eggs, often protected by a shell, such as reptiles and insects, do so after having completed the process of internal fertilization. Water-dwelling animals, such as fish and amphibians, lay their eggs before fertilization, and the male lays its sperm on top of the newly laid eggs in a process called external fertilization. Categories: Biology stubs ...


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  Results from FactBites:
 
Oviparous (417 words)
Oviparous is a zoological term that refers to animals that lay eggs which then hatch externally.
Oviparous animals may fertilize their eggs either externally or internally.
External fertilization in many aquatic invertebrates is less well controlled; for example, in the case of many marine invertebrates which shed immense numbers of gametes to the water more or less simultaneously, with ova and sperm meeting somewhat by chance.
Tasmanian Velvet Worms: Oviparous spp. (364 words)
Oviparous velvet worms were first collected in Tasmania more than a century ago (Spencer 1895) and have long been recognised as widespread and not uncommon animals in this State (Hickman 1963).
Oviparous species are remarkably tolerant of habitat disturbance, such as wildfire, part-clearing, and the clearfelling, burning and regeneration of native forest, and they successfully colonise forest plantations (Mesibov 1998b, Bonham et al.
Oviparous species seem to be particularly abundant on the Great Western Tiers and in open eucalypt forest in the eastern and southern portions of the Central Plateau.
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