? Poeciliidae
Sailfin Molly (Poecilia latipinna)
Scientific classification
Kingdom: Animalia Phylum: Chordata Superclass: Osteichthyes Class: Actinopterygii Order: Cyprinodontiformes Family: Poeciliidae Garman, 1895
Genera
Alfaro Belonesox Brachyrhapis Cnesterodon Gambusia (mosquitofishes) Girardichthys Girardinus Heterandria Heterophallus Jenynsia Limia Micropoecilia Phallichthys Phalloceros Phalloptychus Platypoecilus Poecilia (mollies) Poeciliopsis Priapella Pseudoxiphophorus Quitana Xiphophorus (swordtails, platys) Sailfin molly. ... Binomial name Poecilia latipinna (Lesueur, 1821) Compatibility: Mollies are nice peaceful fish. ... Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anenomes) Placozoa (trichoplax) Subregnum Bilateria (bilateral symmetry) Acoelomorpha (basal) Orthonectida (flatworms, echinoderms, etc. ... Typical Classes Subphylum Urochordata - Tunicatas Ascidiacea Thaliacea Larvacea Subphylum Cephalochordata - Lancelets Subphylum Myxini - Hagfishes Subphylum Vertebrata - Vertebrates Petromyzontida - Lampreys Placodermi (extinct) Chondrichthyes - Cartilaginous fishes Acanthodii (extinct) Actinopterygii - Ray-finned fishes Actinistia - Coelacanths Dipnoi - Lungfishes Amphibia - Amphibians Reptilia - Reptiles Aves - Birds Mammalia - Mammals Chordates (phylum Chordata) include the vertebrates, together with... This article is in need of attention. ... Orders See text The Actinopterygii are the ray-finned fish. ... Families Anablepidae (four-eyed fish) Cyprinodontidae (pupfish) Fundulidae Goodeidae Rivulinidae Poeciliidae (live-bearers) (and others) The Cyprinodontiformes is an order of ray-finned fish, also called the Microcyprini, and comprising mostly small, fresh-water fish. ... Samuel Garman (1846- 1927) was a naturalist/ zoologist from Pennsylvania. ... Species (see text) Gambusia Poey, 1854 is a genus of freshwater fish in family Poeciliidae (order Cyprinodontiformes). ... Species (see text) Poecilia Bloch & Schneider, 1801, is a genus of freshwater fish in family Poeciliidae of order Cyprinodontiformes. ... Species (see text) Xiphophorus Heckel, 1848, is a genus of freshwater fish in family Poeciliidae of order Cyprinodontiformes. ... Binomial name Xiphophorus hellerii Heckel, 1848 The green swordtail (Xiphophorus hellerii) is a species of freshwater fish in family Poecilidae of order Cyprinodontiformes. ... Binomial name Xiphophorus maculatus (Günther, 1866) The southern platyfish (Xiphophorus maculatus) is a species of freshwater fish in family Poecilidae of order Cyprinodontiformes. ...

Poeciliidae is a family of fresh-water fishes which are live-bearing aquarium fish (they give birth to live young). They belong to the order Cyprinodontiformes and include well-known aquarium fish like the guppy, molly, platy, and swordtail. Groups Conodonta Hyperoartia Petromyzontidae (lampreys) Pteraspidomorphi (early jawless fish) Thelodonti Anaspida Cephalaspidomorphi (early jawless fish) Galeaspida Pituriaspida Osteostraci Gnathostomata (jawed vertebrates) Placodermi Chondrichthyes (cartilaginous fish) Acanthodii Osteichthyes (bony fish) Actinopterygii (ray-finned fish) Sarcopterygii (lobe-finned fish) Actinistia (coelacanths) Dipnoi (lungfish) A fish is a poikilothermic (cold-blooded) water-dwelling... Families Anablepidae (four-eyed fish) Cyprinodontidae (pupfish) Fundulidae Goodeidae Rivulinidae Poeciliidae (live-bearers) (and others) The Cyprinodontiformes is an order of ray-finned fish, also called the Microcyprini, and comprising mostly small, fresh-water fish. ... For other uses of this word, see Guppy (disambiguation). ... Species (see text) Poecilia Bloch & Schneider, 1801, is a genus of freshwater fish in family Poeciliidae of order Cyprinodontiformes. ... Binomial name Xiphophorus maculatus (Günther, 1866) The southern platyfish (Xiphophorus maculatus) is a species of freshwater fish in family Poecilidae of order Cyprinodontiformes. ... Binomial name Xiphophorus hellerii Heckel, 1848 The green swordtail (Xiphophorus hellerii) is a species of freshwater fish in family Poecilidae of order Cyprinodontiformes. ...

References

• "Poeciliidae". FishBase. Ed. Ranier Froese and Daniel Pauly. October 2004 version. N.p.: FishBase, 2004.
• "Poeciliidae" (TSN 165876). Integrated Taxonomic Information System. N.p.: Integrated Taxonomic Information System, 2004. Accessed on 4 June 2004.

Live-bearing in Poeciliidae FishBase is a comprehensive database of information about fish. ... The Integrated Taxonomic Information System (ITIS) is a partnership designed to provide consistent and reliable information on the taxonomy of biological species. ... June 4 is the 155th day of the year in the Gregorian calendar (156th in leap years), with 210 days remaining. ... 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ...

Rather than describing the whole family Poeciliidae as "ovo-viviparous", it is probably more accurate to say that the family consists of species which are all live-bearers, but that these vary in their reproductive life history: closely allied species within the same clade may show variable maternal provisioning. It is true that 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).

Members of the genus Poeciliopsis, for example, show variable reproductive life history adaptations. Poeciliopsis monacha, P. lucida, and P. prolifica form part of the same clade within the genus Poeciliopsis. However, their modes of materal provisioning vary greatly. Poeciliopsis monacha can be considered to be lecitrophic due to the fact that it does not really provide any resources for its offspring after fertilization - the pregnant female is basically a swimming egg sac. Poeciliopsis lucida shows an intermediate level of matrotrophy (this literally means "mother feeding" and involves allocation of the majority of resources to the offspring after fertilization), 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".