Asynarchus
McLachlan, 1880
Asynarchus is a of in the Limnephilidae, first described by McLachlan in 1880. are found in small, cold, oligotrophic lakes and ponds across Eurasia and Northern America. The genus includes at least two species: A. contumax and A. lapponicus. and of both species have been described from central Norway.
Pronunciation
How to pronounce Asynarchus: //æ.sɪˈnɑr.kəs//
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Habitat
Small, cold, oligotrophic lakes and ponds. occupy distinct elevational zones: A. lapponicus dominates pools above the tree in the low alpine belt, while A. contumax is in the sub-alpine belt. include both temporary and permanent pools.
Distribution
Eurasia and Northern America. Confirmed records from Norway and Sweden. Central Norway have been studied in detail.
Seasonality
and periods restricted to late June and early July in pools with short drying-up periods. A. lapponicus in permanent pools from early July to early September.
Life Cycle
One-year . Active (larval growth, , , mating, maturation, ) lasts 3-5 months. Passive stage lasts 7-9 months, probably spent inside a gelatinous matrix. Egg masses laid on dry ground in basins during July-August; hatch the following spring after at temperatures of -20 to -30°C. Neither has an imaginal .
More Details
Elevational distribution
In central Norway, A. lapponicus and A. contumax show clear elevational segregation. A. lapponicus is the in pools above the tree in the low alpine belt, while A. contumax dominates in the sub-alpine belt. This pattern suggests partitioning related to temperature or permanence.
Cold tolerance
laid on dry ground in July-August are exposed to air temperatures of -20 to -30°C in late autumn, yet larval hatching occurs normally the following spring. This indicates substantial cold hardiness in the egg stage.