Eubriinae, LeConte, 1861

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 : 269

Subfamily Eubriinae

Larvae of this subfamily have gills enclosed in a chamber on the ninth abdominal sternum and covered by a ventral operculum. The body is more elongate than that of most larvae of other subfamilies. Larval eubriines are commonly found on twigs and in seep and spring areas. Some genera have specific larval microhabitat requirements and thus may be difficult to locate in the field. Pupae are found under rocks and in clumps of grass and sedge beside streams. The pupae have spiracular gills for respiration if the pupae are flooded ( Fig. 23 ). Adults commonly come to lights at night. Larval identifications mainly involve the shape of the paratergites and the ninth abdominal segment. We have included figures of the four genera we collected plus the two genera known from Thailand as adults but lacking in our field collections ( Figs. 31–36 , Maps C–D).

Figures

Figs. 21–24. Morphological structures. 21) Dicranopselaphus: Prothoracic paratergites extending from middle of lateral margins (from Lee et al. 2007); 22) Undescribed Eubrianacinae: Unique pronotal suture (yellow arrow) configuration; 23) Schinostethus: Pupa; 24) Psephenoidinae: Pupa.

Figs. 31–36. Eubriinae genera, dorsal habitus. 31) Dicranopselaphus (from Lee et al. 2007); 32) Granuleubria (from Lee et al. 2007); 33) Homoeogenus (from Lee et al. 2007); 34) Macroeubria; 35) Microeubria; 36) Schinostethus.