Dicondylia

Dicondylia; Temporal range: Early Devonian (but see text)–Present
	Diversity of dicondylians from different orders.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Hexapoda
Class:	Insecta
(unranked):	Dicondylia; Hennig, 1953
Subgroups
	Zygentoma; Paranotalia †Carbotriplurida; Pterygota; †Strudiella; ;

Dicondylia is a taxonomic group (taxon) that includes all insects except the jumping bristletails (Archaeognatha). Dicondylia species have a mandible attached with two hinges to the head capsule (dicondyl), in contrast to a hypothetical ancestral mandible with a single ball joint (monocondyl); the members of Archaeognatha do in fact have dicondylic mandibles, though they are not identical to the structure seen in "true" dicondylic insects.^[2]

^ Engel, Michael S.; David A. Grimaldi (2004). "New light shed on the oldest insect". Nature. 427 (6975): 627–630. Bibcode:2004Natur.427..627E. doi:10.1038/nature02291. PMID 14961119.
^ Blanke, A.; Machida, R.; Szucsich, N.U.; Wilde, F.; Misof, B. (2015). "Mandibles with two joints evolved much earlier in the history of insects: dicondyly is a synapomorphy of bristletails, silverfish and winged insects". Systematic Entomology. 40 (2): 357–364. doi:10.1111/syen.12107.

[EngelGrim-1] Engel, Michael S.; David A. Grimaldi (2004). "New light shed on the oldest insect". Nature. 427 (6975): 627–630. Bibcode:2004Natur.427..627E. doi:10.1038/nature02291. PMID 14961119.

[BlankeEtal-2] Blanke, A.; Machida, R.; Szucsich, N.U.; Wilde, F.; Misof, B. (2015). "Mandibles with two joints evolved much earlier in the history of insects: dicondyly is a synapomorphy of bristletails, silverfish and winged insects". Systematic Entomology. 40 (2): 357–364. doi:10.1111/syen.12107.

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Dicondylia

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