First instar larvae of Corethrella appendiculata Grabham have a prothoracic proleg (Diptera: Corethrellidae)

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Abstract
The first instar larva of Corethrella appendiculata has a prothoracic proleg. This character state was previously considered to be the primary synapomorphy of the Chironomoidea and as such, draws into question the monophyly of that group.