Except for the coxal socket, the most constant landmarks of the subcoxal region are the midventral discrimen, resulting from the meeting of opposite subcoxae whose contiguous margins have been infolded posteriorly to form the sternal apophyses, and the pleural suture extending from the dorsal articulation of the coxa to the pleural wing process.
Source: wiktionary
Mid-ventrally the sternopleurites unite in a suture, the discrimen, whose inflection forms the very high transparent lamella of the discrimen.
Source: wiktionary
In a number of forms the discrimen appears to bifurcate at its anterior end, as well seen in Odontosphex.
Source: wiktionary
The eusternum may be reduced to form a tiny furcasternum (= to the portion sometimes called the sternellum) or an internal cryptosternum indicated externally by a single median, longitudinal line called the discrimen.
Source: wiktionary
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