Eubrianacinae, Boving and Craighead, 1931

Shepard, William D. & Sites, Robert W., 2019, Larval Psephenidae (Coleoptera: Byrrhoidea) of Thailand: Annotated List and Illustrated Key to Genera, The Coleopterists Bulletin 73 (2), pp. 259-282 : 262

Subfamily Eubrianacinae

The larvae of this subfamily have gills that are palmate and exposed on the abdominal sterna ( Fig. 11 ). These larvae typically occur in gravel in streams. Mature larvae are often the largest psephenid larvae found in Thailand. Identification of larvae involves characters on the dorsum. We collected four genera and one undescribed larva from this subfamily ( Figs. 25–30 , Maps A–B). Adults are often collected by sweeping streamside vegetation.

Figures

Figs. 10–14. Morphological structures. 10) Schinostethus: Gills concealed beneath ventral operculum; 11) Undescribed Eubrianacinae: Palmate gills exposed on venter; 12) Psephenoidinae: Ninth abdominal segment surrounded by paratergites of eighth abdominal segment; 13) Schinostethus: Ninth abdominal segment not surrounded by paratergites of eighth abdominal segment; 14) Mataeopsephus: Gills with branches arising from central stalk. 7 = seventh abdominal segment; 8 = eighth abdominal segment; 9 = ninth abdominal segment.

Figs. 25–30. Eubrianacinae genera, dorsal habitus. 25) Eubrianax; 26) Jaechanax; 27) Jinbrianx; 28) Mubrianax;