Extant taxon
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| - | [[Insect]] species make up more than two-thirds of all [[Extant taxon|extant]] animal species, and most insect species use sex for reproduction, though some species are facultatively [[parthenogenetic]]. Many species have [[sexual dimorphism]], while in others the sexes look nearly identical. Typically they have two sexes with males producing spermatozoa and females ova. The ova develop into eggs that have a covering called the [[chorion]], which forms before internal fertilization. Insects have very diverse mating and reproductive strategies most often resulting in the male depositing [[spermatophore]] within the female, which stores the sperm until she is ready for egg fertilization. After fertilization, and the formation of a zygote, and varying degrees of development; the eggs are deposited outside the female in many species, or in some, they develop further within the female and live born offspring are produced. | + | '''Extant''' is a term commonly used in [[biology]] to refer to [[taxon|taxa]], such as [[species]], [[genus|genera]] and [[family (biology)|families]], that are still in existence, meaning ''still alive''. |
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| + | The term ''extant'' contrasts with ''[[extinct]]''. | ||
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| + | ==Example== | ||
| + | For example, [[moose]] is an extant species, while the [[dodo]] is an extinct species. Likewise, of the group of [[mollusc]]s known as the [[cephalopod]]s, as of 1987 there were approximately 600 extant species and 7,500 extinct species. | ||
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Extant is a term commonly used in biology to refer to taxa, such as species, genera and families, that are still in existence, meaning still alive.
The term extant contrasts with extinct.
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Example
For example, moose is an extant species, while the dodo is an extinct species. Likewise, of the group of molluscs known as the cephalopods, as of 1987 there were approximately 600 extant species and 7,500 extinct species.
Unless indicated otherwise, the text in this article is either based on Wikipedia article "Extant taxon" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.
