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The Sierolomorphidae are a family of 13 extant species of , in the genera Sierolomorpha and Proscleroderma, mostly found in the Northern Hemisphere. They are rare and very little is known of their biology. A fossil species Loreisomorpha nascimbenei has also been placed in the family.
The coxa (basal segment of the leg) of the hind and midlegs are next to each other, and the hindwing does not have claval or jugal lobes. The first segment does not have a true node, but can appear like that of the ants. The metasomal sternum of the first segment is separated from the second by a constriction. Sexual dimorphism varies among species from slight to marked, with both males and females having wings, but females are sometimes wingless. Adults are predominantly dark brown or black in colour. They are solitary and the larvae are suspected to be of other insects. (1993). 9780660149332, Agriculture Canada. ISBN 9780660149332
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