Figures: 19, 165, 236
In addition to the Rhithrogeninae characteristics, the following combination of characteristics will identify the genus:
The combination of having reduced lamellae on gills 1, caudal filaments with interfacing setae, three well-developed caudal filaments (Fig. 19), and a labrum that is wider than long will differentiate larvae of Paegnioides from all other Rhithrogeninae genera. Unlike the relatively similar Cinygmula, the row of setae on ventral surface of maxillae is straight rather than curved, and the caudal filaments have interfacing setae.
Males of Paegnioides are unique in having widely separated penes with median titillators that are strongly bent laterally (Fig. 165). Additionally, the mesonotum has a transverse suture (as in Fig. 115).
Southeast Asia (Fig. 236).