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 Sailfin molly (Poecilia latipinna)
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Alfaro |
Poeciliidae is a family of fresh-water fish which are live-bearing aquarium fish (they give birth to live young). The sailfin molly, Poecilia latipinna, is a species of fish of the genus Poecilia. Chordates ( Phylum Chordata) are a group of Animals that includes the Vertebrates together with several closely related Invertebrates The Actinopterygii (the plural form of Actinopterygius) comprise the class of the ray-finned fishes. The Cyprinodontiformes is an order of ray-finned fish, and comprising mostly small fresh-water fish Samuel Walton Garman (1843-1927 was a naturalist / Zoologist from Pennsylvania Gambusia is a genus of Fish in family Poeciliidae (order Cyprinodontiformes) UserPolbot. --> Hypsopanchax is a genus of Fish in the Poeciliidae family UserPolbot. --> Lamprichthys is a genus of Fish in the Poeciliidae family For the town in Mozambique see Limia Mozambique For the river in Spain see Limia River. Micropoecilia is a genus of Fish. One species of the genus is Micropoecilia picta, also known as the swamp or painted guppy UserPolbot. --> Pantanodon is a genus of Fish in the Poeciliidae family Phalloceros is a Genus of livebearer fish P caudimaculatus (One-Spot Livebearer is native to central South America UserPolbot. --> Poeciliopsis is a genus of Fish in the Poeciliidae family UserPolbot. --> Priapella is a genus of Fish in the Poeciliidae family Xiphophorus is a Genus of Freshwater Fish in family Poeciliidae of order Cyprinodontiformes. Fish are aquatic Vertebrate animals that are typically ectothermic (previously Cold-blooded) covered with scales, and equipped with two Live-bearing aquarium fish, often simply called livebearers, are Fish that retain the eggs inside the body and give birth to live free-swimming young They belong to the order Cyprinodontiformes, tooth-carps, and include well-known aquarium fish like the guppy, molly, platy, and swordtail. The Cyprinodontiformes is an order of ray-finned fish, and comprising mostly small fresh-water fish The guppy (la '''''Poecilia reticulata''''' also known as the millionfish, is one of the most popular freshwater aquarium fish species in the world Xiphophorus is a Genus of Freshwater Fish in family Poeciliidae of order Cyprinodontiformes. For the genus of butterflies commonly known as swordtails see Graphium. The original distribution of the family was eastern United States to northeastern Argentina, and central and southern Africa, including Madagascar. The United States of America —commonly referred to as the For a topic outline on this subject see List of basic Argentina topics. Madagascar, or Republic of Madagascar (older name Malagasy Republic) is an Island nation in the Indian Ocean off the southeastern However, due to release of aquarium specimens and the widespread use of species of the genera Poecilia and Gambusia for mosquito control, poeciliids can today be found in all tropical and subtropical areas of the world. Gambusia is a genus of Fish in family Poeciliidae (order Cyprinodontiformes)
Live-bearing
Although the whole family Poeciliidae is known as "live bearers", there are in the family both true live-bearing "ovoviviparous" species, which have internal fertilization and the eggs hatch before being laid, so that the female gives birth to live young, and egg-scattering species with external fertilization. Ovoviviparous Animals develop within eggs that remain within the mother's body up until they hatch or are about to hatch All African species are egg-layers, and with the exception of the members of the genus Fluviphylax are all American species livebearers. This distribution suggests that Poeciliidae predate the split between Africa and South America 100 million years ago, that live-bearing subsequently evolved in south America, and that north-America was colonized by poeciliids following the formation of the isthmus of Panama 3 million years ago. The Isthmus of Panama, also historically known as the Isthmus of Darien, is the narrow strip of land that lies between the Caribbean Sea and the Pacific
Among the live-bearing species there are differences in the mode and degree of support the female gives the developing larvae; although many members of the family Poeciliidae are considered to be lecitrophic (meaning that the mother provisions the oocyte with all the resources it needs prior to fertilization, so that the egg is independent of the mother), but others are matrotrophic (literally means "mother feeding": the mother provides the majority of resources to the developing offspring after fertilization). An oocyte, ovocyte, or rarely ocyte, is a female Gametocyte or Germ cell involved in reproduction.
Members of the genus Poeciliopsis, for example, show variable reproductive life history adaptations. UserPolbot. --> Poeciliopsis is a genus of Fish in the Poeciliidae family Poeciliopsis monacha, P. UserPolbot. --> Poeciliopsis monacha is a species of Fish in the Poeciliidae family lucida, and P. prolifica form part of the same clade within the genus Poeciliopsis. However, their modes of maternal provisioning vary greatly. P. monacha can be considered to be lecitrophic because it does not really provide any resources for its offspring after fertilization - the pregnant female is basically a swimming egg sac. P. lucida shows an intermediate level of matrotrophy, meaning that to a certain extent the offspring's metabolism can actually affect the mother's metabolism, allowing for increased nutrient exchange. Poeciliopsis prolifica is considered to be highly matrotrophic, and almost all of the nutrients and materials needed for fetal development are supplied to the oocyte after it has been fertilized.
Poeciliopsis elongata, P. turneri, and P. presidionis form another clade which could be considered an outgroup to the P. monacha/P. lucida/P. prolifica clade. These three species are very highly matrotrophic - so much so that in 1947 C. L. Turner described the follicular cells of P. turneri as "pseudo-placenta, pseudo-chorion, and pseudo-allantois".
References
- "Poeciliidae". FishBase. FishBase is a comprehensive Database of information about Fish. Ed. Rainer Froese and Daniel Pauly. October 2004 version. N. p. : FishBase, 2004.
- Poeciliidae (TSN 165876). Integrated Taxonomic Information System. Integrated Taxonomic Information System ( ITIS) is a partnership designed to provide consistent and reliable information on the Taxonomy of biological Species Retrieved on 4 June 2004. Events 781 BC - The first historic Solar eclipse is recorded in China. "MMIV" redirects here For the Modest Mouse album see " Baron von Bullshit Rides Again "
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