Belongs within: Psylloidea.
The Psyllinae are a group of plant-lice with the R vein separating in the wing before the M and Cu veins, and an undivided male proctiger (Heslop-Harrison 1961). The Asian citrus psyllid Diaphorina citri is a particularly notorious species as it acts as a vector of citrus greening disease (Huanglongbing). Members of the genus Acizzia primarily feed on Acacia and related plants. Psylla alni feeds on young shoots on Betulaceae.
Within the subfamily, members of the Diaphorinini are distinguished by the presence of lanceolate setae around the margin of the abdomen in nymphs. Arytainini have the lateral extremities of the pronotum more or less swollen and knob-like.
Characters (from Heslop-Harrison 1961): Genae normally developed into conical swellings of variable development, only occasionally flat or rounded. When developed into cones, the latter do not obscure the antennal bases, but frequently cover or suppress the frons. Venation with the radial petiole arising from the common basal petiole independently of the joint medio-cubital petiole. Latter rarely as long as former, usually much shorter. Male proctiger never bipartite, comprised of an entire segment ten, usually tubular or, more rarely, with short rounded lateral wings. Antennae filiform, medium to quite long (from 1.5 to two or more times as longs as width of head), only occasionally short and stout; ten-segmented. Paired metatarsal spines present except in some Arytainini (in which reduced to one or none). Pronotum not constricted laterally. Propleurites of variable development, dividing pleural suture either vertical or diagonal. Ante-occipital tubercles rarely present.
<==PsyllinaeH-H61
| i. s.: Retroacizzia Heslop-Harrison 1961H-H61
| `--*R. antennata Heslop-Harrison 1961H-H61
| Palaeolindbergiella Heslop-Harrison 1961 (see below for synonymy)H-H61
| `--*P. primitiva (Heslop-Harrison 1961) [=Lindbergiella (*Palaeolindbergiella) primitiva]H-H61
| Parapsylla Heslop-Harrison 1961H-H61
| `--*P. relicta Heslop-Harrison 1961H-H61
| Jenseniella Tuthill 1959H-H61
| Agmapsylla Heslop-Harrison 1961H-H61
| `--*A. aureus Heslop-Harrison 1961H-H61
|--PsyllaWEE70 [PsylliniH-H61]
| |--P. acaciaebaileyanaeWEE70
| |--P. acaciaedecurrentesWEE70
| |--P. alni (Linnaeus 1758)L02, L58 [=Chermes alniL02]
| |--P. annulataE66
| |--P. buxiRD77
| |--P. maliRD77
| |--P. minutiformaYM96
| |--P. pyricolaA99
| `--P. striataE66
|--Diaphorinini [Diaphorininae]H-H61
| |--PsyllopsisCGW91
| | |--P. fraxinicolaCGW91
| | `--P. mexicanaYM96
| `--Diaphorina Löw 1879H-H61 [=Diaphora Löw 1878 (preoc.)H-H61; incl. BrachypsyllaCGW91]
| |--*D. putoni (Löw 1878) [=*Diaphora putoni]H-H61
| |--D. acokantherae [=Euphalarus acokantherae]H-H61
| |--D. brevigena Heslop-Harrison 1961H-H61
| |--D. carissae [=Euphalarus carissae]H-H61
| |--D. citriMHG04
| |--D. natalensis [=Euphalarus natalensis]H-H61
| |--D. porrigogena Heslop-Harrison 1961H-H61
| |--D. punctipennis Heslop-Harrison 1961H-H61
| |--D. punctulatus [=Euphalarus punctulatus]H-H61
| |--D. rubra Heslop-Harrison 1961H-H61
| `--D. typica Heslop-Harrison 1961H-H61
`--ArytaininiH-H61
|--Acizzia Heslop-Harrison 1959 [incl. Neopsylla Heslop-Harrison 1946 (preoc.); Acizziinae]H-H61
| |--*A. acaciae (Maskell 1894) [=Psylla acaciae]H-H61
| |--A. acaciaedecurrentisCGW91
| |--A. immaculata Heslop-Harrison 1961H-H61
| `--A. uncatoidesYM96
|--Floria Löw 1878H-H61
| | i. s.: F. pyrenaeaH-H61
| | F. spartiisugaH-H61
| |--*F. (Floria) spectabilis (Flor 1861)H-H61
| `--F. (Brinckitia Heslop-Harrison 1961)H-H61
| `--F. (*B.) annosa Heslop-Harrison 1961H-H61
`--ArytainaH-H61
|--A. brevigenaH-H61
|--A. flavaH-H61
|--A. genistaeH-H61
|--A. meridionalisH-H61
|--A. tuberculataH-H61
|--A. variabilisH-H61
`--A. virginaYM96
Palaeolindbergiella Heslop-Harrison 1961 [=Lindbergia Heslop-Harrison 1949 (n. n.) non Riedel 1959, Lindbergiella Heslop-Harrison 1961 (nom. inv.)]H-H61
*Type species of generic name indicated
References
[A99] Ax, P. 1999. Das System der Metazoa II. Ein Lehrbuch der phylogenetischen Systematik. Gustav Fisher Verlag: Stuttgart (translated: 2000. Multicellular Animals: The phylogenetic system of the Metazoa vol. 2. Springer).
[CGW91] Carver, M., G. F. Gross & T. E. Woodward. 1991. Hemiptera (bugs, leafhoppers, cicadas, aphids, scale insects etc.) In: CSIRO. The Insects of Australia: A textbook for students and research workers 2nd ed. vol. 1 pp. 429–509. Melbourne University Press: Carlton (Victoria).
[E66] Evans, H. E. 1966. The Comparative Ethology and Evolution of the Sand Wasps. Harvard University Press: Cambridge (Massachusetts).
[H-H61] Heslop-Harrison, G. 1961. Hemiptera (Homoptera): Psyllidae. In: Hanström, B., P. Brinck & G. Rudebeck (eds) South African Animal Life: Results of the Lund University Expedition in 1950–1951 vol. 8 pp. 487–532. Almqvist & Wiksell: Uppsala.
[L02] Latreille, P. A. 1802. Histoire Naturelle, générale et particulière des crustacés et des insectes vol. 3. Familles naturelles des genres. F. Dufart: Paris.
[L58] Linnaeus, C. 1758. Systema Naturae per Regna Tria Naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis revised 10th ed. vol. 1. Laurentii Salvii: Holmiae.
[MHG04] Maynard, G. V., J. G. Hamilton & J. F. Grimshaw. 2004. Quarantine—phytosanitary, sanitary and incursion management: an Australian entomological perspective. Australian Journal of Entomology 43 (3): 318–328.
[RD77] Richards, O. W., & R. G. Davies. 1977. Imms’ General Textbook of Entomology 10th ed. vol. 2. Classification and Biology. Chapman and Hall: London.
[WEE70] Woodward, T. E., J. W. Evans & V. F. Eastop. 1970. Hemiptera (bugs, leafhoppers, etc.) In: CSIRO. The Insects of Australia: A textbook for students and research workers pp. 387–457. Melbourne University Press.
[YM96] Yang, M.-M., & D. R. Miller. 1996. Checklist of the psyllids (Homoptera: Psylloidea) of Mexico. Proceedings of the Entomological Society of Washington 98 (1): 122–125.