Nasonovia ribisnigri is a species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 of aphid

Aphid

Aphids, also known as plant lice and in Britain and the Commonwealth as greenflies, blackflies or whiteflies, are small sap sucking insects, and members of the superfamily Aphidoidea. Aphids are among the most destructive insect pests on cultivated plants in temperate regions...

. Their primary hosts are currant plants

Ribes

Ribes is a genus of about 150 species of flowering plants native throughout the temperate regions of the Northern Hemisphere. It is usually treated as the only genus in the family Grossulariaceae. Seven subgenera are recognized....

, including blackcurrant

Blackcurrant

Blackcurrant, Ribes nigrum, is a species of Ribes berry native to central and northern Europe and northern Asia, and is a perennial....

s (Ribes nigrum) and gooseberries

Gooseberry

The gooseberry or ; Ribes uva-crispa, syn. R. grossularia) is a species of Ribes, native to Europe, northwestern Africa and southwestern Asia...

 (Ribes uva-crispa), while the secondary hosts are a wider range of plants, including members of the Compositae (Hieracium

Hieracium

Hieracium known by its common name Hawkweed and long ago by its classical name hierakion which comes from the ancient Greek hierax, "a hawk"...

, Lapsana, Crepis

Crepis

Crepis, commonly known in some parts of the world as hawksbeard or hawk's-beard , is a genus of about 200 annual and perennial flowering plants of the family Asteraceae superficially resembling the dandelion, the most conspicuous difference being that Crepis usually has branching...

, Leontodon

Hawkbit

Hawkbits are dandelion-like flowers in the family Asteraceae . Their English name derives from the mediæval belief that hawks ate the plant to improve their eyesight...

and Cichorium

Cichorium

Cichorium is a genus of flowering plants in the family Asteraceae. The species are commonly known as chicory or endive – there are two cultivated species, and four to six wild species....

), Lamiales

Lamiales

Lamiales is an order in the asterid group of dicotyledonous flowering plants. It includes approximately 11,000 species divided into about 20 families...

 (Veronica

Veronica (plant)

Veronica is the largest genus in the flowering plant family Plantaginaceae, with about 500 species; it was formerly classified in the family Scrophulariaceae...

and Euphrasia

Euphrasia

Euphrasia is a genus of about 450 species of herbaceous flowering plants in the family Orobanchaceae , with a cosmopolitan distribution. They are semi-parasitic on grasses and other plants...

) and Solanaceae

Solanaceae

Solanaceae are a family of flowering plants that include a number of important agricultural crops as well as many toxic plants. The name of the family comes from the Latin Solanum "the nightshade plant", but the further etymology of that word is unclear...

 (Nicotiana

Nicotiana

Nicotiana is a genus of herbs and shrubs of the nightshade family indigenous to North and South America, Australia, south west Africa and the South Pacific. Various Nicotiana species, commonly referred to as tobacco plants, are cultivated and grown to produce tobacco. Of all Nicotiana species,...

and Petunia

Petunia

Petunia is a widely cultivated genus of flowering plants of South American origin, closely related with tobacco, cape gooseberries, tomatoes, deadly nightshades, potatoes and chili peppers; in the family Solanaceae. The popular flower derived its name from French, which took the word petun, meaning...

).

Males grow to a length of 2.5 millimetre (0.0984251968503937 in), while viviparous females are 1.7 millimetre long, but oviparous female only reach 1.6 millimetre.