Embryonic-diapause
Guides
Podmosta
spring stoneflies
Podmosta is a genus of spring stoneflies in the family Nemouridae, comprising approximately six described species distributed across northern North America and the Russian Far East. The genus is notable for its adaptation to cold climates, including documented embryonic diapause in at least one species. Adults are active in spring, with nymphal development occurring primarily during winter months.
Podmosta macdunnoughi
maritime forestfly
Podmosta macdunnoughi is a small nemourid stonefly distributed across glaciated regions of eastern Canada and northern New England. The species exhibits a univoltine life cycle with adults emerging in late April and early May. A distinctive embryonic diapause delays egg hatching until September, with nymphs active through winter and growth resynchronizing before emergence.