Judson, Sarah W. & Nelson, C. Riley, 2012, 3541, Zootaxa 3541, pp. 1-118: 29

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DIAGNOSIS: The coloration of Leuctra   adults is generally brown, although it sometimes fade to light brown to pale orange when preserved. Males are easily recognized by two paired sclerotized processes ( Fig. 138) on the dorsal side of the abdominal segments. The subgenital plate of the female with three lobes ( Fig. 139), one more recessed than the other two. Nymphs are characterized by relatively longer palps in relation to labium ( Fig. 131), as opposed to Paraleuctra   which has short palps not surpassing the labium. Nymphs with many short setae on the posterior margin of each abdominal tergum ( Fig. 132), which Paraleuctra   lacks.

DISTRIBUTION—Global: Holarctic, especially common in Europe— Regional: AOB - Aimag: SE, TO*, UB*.

DISCUSSION: It is interesting to note that the distribution in Mongolia is limited to the north central aimags, despite intense collecting further west. If the species L. fusca (Linnaeus, 1758)   is conspecific with European populations, then the connection must be further north of Mongolia, in Russia rather than across Asia at the same latitude.