Aschiza is a section of Brachycera

Brachycera

Brachycera is a suborder of Diptera. It is a major suborder consisting of around 120 families. The most distinguishing characteristic of the suborder is reduced antenna segmentation...

. There are two large families in this group, Syrphidae and Phoridae, and a number of smaller taxa. They are similar to most of the familiar Muscomorpha

Muscomorpha

The Brachyceran infraorder Muscomorpha is a large and diverse group of flies, containing the bulk of the Brachycera, and, in fact, most of the known flies. It includes a number of the most familiar flies, such as the housefly, the fruit fly and the blowfly. The antennae are short, usually...

 with one notable exception; they do not possess a ptilinum

Ptilinum

The ptilinum is an eversible pouch on the head, above the base of the antenna in schizophoran flies . It is used to force off the end of the puparium in order for the fly to emerge, and after this inflation at emergence, the ptilinum collapses back inside the head, marked thereafter only by the...

, and therefore lack the prominent ptilinal suture on the face as in other muscoid

Schizophora

Schizophora is a section of true flies containing 78 families, which are collectively referred to as muscoids, even though - technically - the term "muscoid" should be limited to flies in the superfamily Muscoidea; this is an example of informal, historical usage persisting in the vernacular...

 flies. They do still have a puparium with a circular emergence opening, but it is not as precisely ellipsoid in shape as is typical for other muscoids.
The term was first used by Eduard Becher

Eduard Becher

Eduard Becher was an Austrian entomologist who worked on Diptera. He wrote Zur Kenntnis der Kopfbildung der Dipteren Wien ent. Zeitung, 1: 49-54...

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