Non-feeding-adults
Guides
Araeopidius monachus
Araeopidius monachus is the sole species in the subfamily Araeopidiinae within the beetle family Ptilodactylidae. It is endemic to western North America, where adults are rarely encountered. The species exhibits an unusual three-year life cycle among beetles, with larvae feeding on woody material while adults appear to be non-feeding. Its biology remains poorly understood due to the scarcity of specimens and limited field observations.
Dinapate wrightii
Giant Palm Borer
Dinapate wrightii, the Giant Palm Borer, is the largest species in the beetle family Bostrichidae, reaching approximately 5 cm in length. Adults are non-feeding and live about two weeks. The species is native to extreme southern California and Baja California Sur, Mexico, with most records from the Coachella Valley. It is a pest of fan palms, particularly Washingtonia species.
Eubriinae
Eubriinae is a cosmopolitan subfamily of water penny beetles (Psephenidae) comprising approximately 15 genera and 144 species, with greatest diversity in Asia. Adults are distinguished by a convex dorsal body form, truncate or emarginate anterior pronotum with exposed head, non-tapering maxillary palpus apex, and five abdominal ventrites. Larvae are aquatic and exhibit a metapneustic respiratory system with spiracles positioned near the bases of paratergites VIII. The subfamily exhibits nearly worldwide distribution except Antarctica and some oceanic islands including New Zealand.
Pleocoma
rain beetles
Pleocoma is the sole extant genus of Pleocomidae, a family endemic to the Pacific states of North America. These beetles are notable for their extreme subterranean lifestyle, with adults emerging only during fall and winter rains to mate. The genus name derives from Greek words for 'abundant hair,' referring to the dense ventral hair covering. Adults are non-feeding, while larvae are root-feeders with exceptionally long development periods of up to 13 years.
Scarabaeoidearain-beetlessubterraneannon-feeding-adultslong-lived-larvaepheromone-mediated-matingendemicNearcticrelictual-distributionCretaceous-originpest-of-Christmas-treeslamellate-antennaeflightless-femalesrain-triggered-emergenceCalifornia-faunaOregon-faunaWashington-faunaroot-feeding-larvaeextreme-seasonalitylight-attracted-malesSiphlonurus
primitive minnow mayflies, gray drakes
Siphlonurus is a genus of primitive minnow mayflies in the family Siphlonuridae, comprising more than 40 described species. Species inhabit temporary and intermittent ponds, with nymphal development occurring during spring months and adult emergence in late May to June. Adults are non-feeding and rely on energy reserves accumulated during the aquatic larval stage. The genus is notable among fly fishers for species such as Siphlonurus quebecensis (early brown quill), which is imitated with specialized fly patterns.