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Family Aphididae - Aphids

Balsam Fir Twig Aphid - Mindarus abietinus aphids on milkweed leaf - Aphis asclepiadis Aphidae - Rhopalosiphum nymphaeae Aphid - Capitophorus Myzocallis walshii? - Myzocallis Aphid - Drepanaphis Alate aphid Uroleucon achilleae?
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Sternorrhyncha (Plant-parasitic Hemipterans)
Superfamily Aphidoidea
Family Aphididae (Aphids)
Other Common Names
Plant lice or Ant cows
Synonyms and other taxonomic changes
Taxonomy on BG follows(1)
Numbers
1351 spp. in 224 genera (w/40 subgenera) in our area, of which ~80 spp. are pests of food crops and ornamental plants(2) and almost 300 spp. are adventive(3)(4)
Overview of our fauna (* –taxa not yet in the guide):Family APHIDIDAE
Subfamily Anoeciinae Anoecia
Subfamily Aphidinae
Tribe Macrosiphini Abstrusomyzus · *Acuticauda · Acyrthosiphon · *Alphitoaphis · *Amphicercidus · Amphorophora · *Anthracosiphon · Aphthargelia · *Artemisaphis · *Aspidaphis · *Aspidophorodon · *Atarsos · Aulacorthum · *Bipersona · Brachycaudus · *Brachycolus · *Brachycorynella · Brevicoryne · *Cachryphora · Capitophorus · Carolinaia · Catamergus · Cavariella · Cedoaphis · Ceruraphis · Chaetosiphon · *Coloradoa · Corylobium · *Cryptaphis · *Cryptomyzus · *Decorosiphon · *Delphiniobium · *Diuraphis · *Durocapillata · *Dysaphis · *Elatobium · *Eomacrosiphon · *Epameibaphis · Ericaphis · Eucarazzia · *Flabellomicrosiphum · *Glendenningia · Gypsoaphis · Hayhurstia · Hyadaphis · *Hyalomyzus · *Hyalopteroides · Hyperomyzus · *Idiopterus · Illinoia · *Jacksonia · *Landisaphis · *Linosiphon · Liosomaphis · *Lipamyzodes · Lipaphis · Longicaudus · *Macchiatiella · Macrosiphoniella · Macrosiphum · *Mastopoda · *Megoura · *Megourina · Metopolophium · *Microlophium · Microparsus · Microsiphoniella · *Muscaphis · Myzaphis · *Myzodium · Myzus · Nasonovia · Nearctaphis · *Neoamphorophora · Neotoxoptera · Obtusicauda · *Ovatus · *Papulaphis · *Pentalonia · *Pentamyzus · Phorodon · Pleotrichophorus · Plocamaphis · *Pseudacaudella · *Pseudocercidis · Pseudoepameibaphis · *Rhodobium · *Rhopalosiphoninus · Rhopalomyzus · *Semiaphis · *Sinomegoura · Sitobion · Staticobium · *Subacyrthosiphon · *Titanosiphon · Uroleucon · Utamphorophora · *Vesiculaphis · Wahlgreniella
Subfamily Calaphidinae
Subfamily Chaitophorinae
Subfamily Eriosomatinae
Subfamily Greenideinae
Subfamily Hormaphidinae
Subfamily Lachninae
Tribe Tramini Trama
Subfamily Mindarinae Mindarus
Subfamily Saltusaphidinae
Subfamily Tamaliinae Tamalia
Subfamily *Thelaxinae
Size
Aphids are generally small insects ranging from ~1-6mm in body length.
Identification
Most aphids can be identified to family level by two tubelike projections on the posterior, called cornicles or siphunculi, although in some exceptions the siphunculi are greatly reduced or absent. The siphunculi emit pheromones to alert other aphids in the colony when danger is nearby. They also offer mechanical protection, as the fluid emitted can gum up the mouthparts of predators.

Species identification often requires specific views of the specimen, and many cannot be reliably identified with images. Aphids are often difficult to identify with a well placed slide mount and a high powered scope due to their small size and often minor differences in characters used in identification. For example, two species may be separated by the shape and number of secondary sensoria on antennal segment three, which is not very easy to see in photographs.

When submitting images of aphids, more angles and views increase the likelihood of identification. Taking pictures of different morphs is also really helpful. Alate forms are often easier to ID than apterous, and some forms such as oviparae are poorly known so they usually can't be identified beyond family. Immature aphids generally cannot be reliably identified beyond family either.
Species identification is usually easier if host plant is known, but similar aphid species may infest the same host. An attempt to organize aphid images by host plant is underway.

Aphids on the World's Plants - Worldwide fauna with keys specific to host plants.

Aphid identification - European and globally distributed species.
Range
Widespread. Aphids are unusual compared to other insects, because their diversity is higher in temperate regions and lower in the tropics.
Habitat
Colonizing various plants. Feeding preference can affect what part of a plant the aphid is on, such as the stem or the back of leaves.
Season
Different species have what are called peak flights during the growing season. Males are usually observed in the fall, and different morphs can also be present at specific times.
Food
Aphids are phloem feeders, they use their sucking piercing mouthparts to suck juices from plants. Some are restricted to a single plant species or group of related plants. Others may alternate between two entirely unrelated host plants as a necessary part of their life cycle (e.g. Dysaphis plantaginea begins the year on apple, then migrates to narrow-leaved plantain for several generations before winged adults return to apple trees where they produce eggs that will overwinter). Aphids that do alternate host plants are called heteroecious, and those that do not host alternate are known as monoecious. Aphids that feed on multiple species of plant are known as polyphagous, a few different plants is oligophagous, and if they only utilize one species of plant they are monophagous.
Life Cycle
Aphids can follow two types of life cycle, holocyclic and anholocyclic. Holocyclic species alternate between sexual and parthenogenetic reproduction. Over-wintering eggs produced by sexual reproduction hatch in the spring. They are wingless females known as fundatrices, and are parthenogenetic or able to reproduce without fertilization. The fundatrices give live birth to more females. The second generation of asexual females are known as viviparae, because they hold embryos in their bodies to give birth to live young. As the colony grows winged females known as alatae may be produced, although they are unknown in some species. Near autumn as the photoperiod shortens and temperature decreases, male forms and egg-laying females called oviparae are produced. After mating, the oviparae lay fertilized eggs which overwinter until the spring. In anholocyclic species there is no sexual reproduction, only parthenogenetic repoduction. This is especially common in warm climates where overwintering is unnecessary. There are some anholocyclic species, such as Aphis nerii, where males have never been observed in the wild.

live birth:
Remarks
Feeding aphids excrete a sugar-rich liquid known as honeydew, often consumed by ants who tend aphid colonies and protect them from predators in exchange. Ants are herding aphids and "milk" them by stroking the aphids with their antennae. Some ant species move aphids from one plant to another when the food supply is insufficient, or even take aphid eggs into their nests to help them overwinter.
Predators of aphids include (left to right, below) lacewing larvae, ladybird beetles and larvae, harvester butterfly caterpillars, and syrphid fly larvae.

Aphids are also attacked by parasitic wasps, which lay eggs inside them. Parasitized aphids swell, become lighter in color and are eventually killed by the developing wasp inside. These are referred to as "aphid mummies."
Print References
Blackman, R. L.; Eastop, V. F. (1994) Aphids on the World’s Trees: An Identification and Information Guide CAB International 987 pages

Blackman, R. L.; Eastop, V. F. (2000) Aphids on the World’s Crops: An Identification and Information Guide (2nd Edition) John Wiley & Sons 466 pages

Blackman, R. L.; Eastop, V. F. (2006a) Aphids on the World’s Herbaceous Plants and Shrubs: Volume 1 - Host Lists and Keys John Wiley & Sons 1460 pages

Blackman, R. L.; Eastop, V. F. (2006b) Aphids on the World’s Herbaceous Plants and Shrubs: Volume 2 - The Aphids John Wiley & Sons 1460 pages

Quednau, F. W. (1999). Atlas of the Drepanosiphine Aphids of the World Part I: Panaphidini Oestlund, 1922 – Myzocallidina Börner. 1942 (1930) (Hemiptera: Aphididae: Calaphidinae). The American Entomological Institute 281 pages

Quednau, F. W. (2003). Atlas of the Drepanosiphine Aphids of the World Part II: Panaphidini Oestlund, 1923 – Panaphidinae Oestlund, 1923 (Hemiptera: Aphididae: Calaphidinae). The American Entomological Institute 301 pages

Quednau, F. W. (2010). Atlas of the Drepanosiphine Aphids of the World Part III: Mindarinae Tullgren, 1909; Neophyllaphidinae Takahashi 1921; Lizeriinae E.E. Blanchard, 1923; Pterasteheniinae Remaudière & Quednau, 1988; Macropodaphidinae Zachvatkin & Aizenberg, 1960; Taiwanaphidinae Quesdnau & Remaudière, 1994; Spicaphidinae Essig, 1953; Phyllaphidinae Herrich-Schaeffer IN Koch, 1857; Israelaphidinae Ilharco, 1961; Saltusaphidinae Baker, 1920 (Hemiptera: Sternorrhyncha, Aphididae). The American Entomological Institute 361 pages

Heie, O.E., (1980). The Aphidoidea (Hemiptera) of Fennoscandia and Denmark I : General Part. The Families Mindaridae, Hormaphididae, Thelaxidae, Anoeciidae, and Pemphigidae. Fauna Entomologica Scandinavica, Scandinavian Science Press LTD 236 pages

Heie, O.E., (1982). The Aphidoidea (Hemiptera) of Fennoscandia and Denmark II : The Family Drepanosiphidae. Fauna Entomologica Scandinavica, Scandinavian Science Press LTD 176 pages

Heie, O.E., (1986). The Aphidoidea (Hemiptera) of Fennoscandia and Denmark III : Family Aphididae: Subfamily Pterocommatinae & Tribe Aphidini of subfamily Aphidinae. Fauna Entomologica Scandinavica, Scandinavian Science Press LTD 312 pages

Heie, O.E., (1992). The Aphidoidea (Hemiptera) of Fennoscandia and Denmark IV : Family Aphididae; Part 1 of tribe Macrosiphini of subfamily Aphidinae. Fauna Entomologica Scandinavica, Scandinavian Science Press LTD 188 pages

Heie, O.E., (1994). The Aphidoidea (Hemiptera) of Fennoscandia and Denmark V : Family Aphididae: Part 2 of tribe Macrosiphini of subfamily Aphidinae. Fauna Entomologica Scandinavica, Scandinavian Science Press LTD 242 pages

Heie, O.E., (1995). The Aphidoidea (Hemiptera) of Fennoscandia and Denmark VI : Family Aphididae: Part 3 of tribe Macrosiphini of subfamily Aphidinae, and family Lachnidae. Fauna Entomologica Scandinavica, Scandinavian Science Press LTD 222 pages

Messing, R.H., Pike, K. S.; Foottit, R.G, (2012). Invasive Aphids in Hawaii. College of Tropical Agriculture and Human Rsources, University of Hawai’i at Mānoa 261 pages

Voegtlin, D., Villalobos, W., Sánchez, M.V., Saborío, G., Rivera, C., (2003). A Guide to the Winged Aphids of Costa Rica. International Journal of Tropical Biology and Convervation, Vol. 51, Supl. 2, 238 pages
Internet References
Blackman, R.L., and Eastop. V.F., B. 1994. Aphids on the World’s Plants. http://www.aphidsonworldsplants.info/

Brightwell, B., and Dransfield, B. 2012. Influential Points - Aphid Identification. http://www.influentialpoints.com/Gallery/Aphid_genera.htm

Favret, C. and G.L. Miller. 2012. AphID. Identification Technology Program, CPHST, PPQ, APHIS, USDA; Fort Collins, CO. http://AphID.AphidNet.org/

Favret, C. Aphid Species File. Version 5.0/5.0. http://Aphid.SpeciesFile.org
Works Cited
1.Favret C. (2013) Aphid Species File. Version 5.0
2.American Insects: A Handbook of the Insects of America North of Mexico
Ross H. Arnett. 2000. CRC Press.
3.Adventive aphids (Hemiptera: Aphididae) of America north of Mexico
Foottit R.G., Halbert S.E., Miller G.L., Maw E., Russell L.M. 2006. Proc. Ent. Soc. Wash. 108: 583-610.
4.An update to the adventive aphids (Hemiptera: Aphidoidea) of America North of Mexico, with notes on intercepted species
Skvarla M., Halbert S., Foottit R.G., Miller G.L. 2017. Proc. Ent. Soc. Wash. 119: 90-111 .
5.Blackman R., Eastop V. (-2013) Aphids on the world’s plants