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Encyclopedia > Vivipary
Poa alpina, a grass which shows vivipary: the seeds germinate while still attached to the mother plant.
Poa alpina, a grass which shows vivipary: the seeds germinate while still attached to the mother plant.

A viviparous animal is an animal employing vivipary: the embryo develops inside the body of the mother, as opposed to outside in an egg (ovipary). The mother then gives live birth. The less developed form of vivipary is called ovoviviparity, which, for instance, occurs in most vipers. The more developed form of vivipary is called placental viviparity; mammals are the best example, but it has also evolved independently in other animals, such as in scorpions, some sharks, and in velvet worms. Viviparous offspring live independently and require an external food supply from birth. Certain lizards also employ this method such as the Genus Tiliqua and Corucia. The placenta is attached directly to the mother in these lizards which is called viviparous matrotrophy. Image File history File links Size of this preview: 800 × 600 pixelsFull resolution‎ (1,280 × 960 pixels, file size: 66 KB, MIME type: image/jpeg) File historyClick on a date/time to view the file as it appeared at that time. ... Image File history File links Size of this preview: 800 × 600 pixelsFull resolution‎ (1,280 × 960 pixels, file size: 66 KB, MIME type: image/jpeg) File historyClick on a date/time to view the file as it appeared at that time. ... For other uses, see Grass (disambiguation). ... For other uses, see Animal (disambiguation). ... In most birds and reptiles, an egg (Latin ovum) is the zygote, resulting from fertilization of the ovum. ... In most birds and reptiles, an egg (Latin ovum) is the zygote, resulting from fertilization of the ovum. ... A live birth of a human being occurs when a fetus is expelled and separated from the mothers body and subsequently shows some sign of life, such as voluntary movement, heartbeat, or pulsation of the umbilical cord, but for however brief thistime. ... Ovoviviparous animals develop within eggs that remain within the mothers body up until they hatch or are about to hatch. ... Synonyms Viperae - Laurenti, 1768 Viperini - Oppel, 1811 Viperidae - Gray, 1825[1] The Viperidae are a family of venomous snakes commonly referred to as vipers, although the term viperids is more specific and distinguishes them from the viperines (subfamily Viperinae). ... The placenta is a sack of fat present in placental vertebrates, such as some mammals and sharks during gestation (pregnancy). ... Superfamilies Pseudochactoidea Buthoidea Chaeriloidea Chactoidea Iuroidea Scorpionoidea See classification for families. ... For other uses, see Shark (disambiguation). ... Global range of Onychophora: Peripatidae in green, Peripatopsidae in blue Extant families Peripatidae Peripatopsidae Onychophora, the velvet worms (occasionally called walking worms or spitting worms), are segmented, caterpillar-like, terrestrial animals somewhat resembling both arthropods and annelid worms. ...


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