Diapheromera femorata
(Say, 1824)
Northern Walkingstick, Common Walkingstick
Diapheromera femorata is the most widespread and economically significant to the United States. reach 75–95 mm in length, with females typically larger than males. The is notable for periodic that can cause localized of trees, particularly oaks. It is the only phasmid of documented economic importance in North America, with historical outbreaks affecting thousands of hectares in Michigan, Wisconsin, Arkansas, and Oklahoma.
Pronunciation
How to pronounce Diapheromera femorata: /daɪəˌfɛrəˈmɪərə fɛmɔˈrɑːtə/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
are wingless with extremely elongated, cylindrical bodies resembling twigs. in size is pronounced: males average 75 mm, females 95 mm. Body coloration ranges from to green, providing effective against . are long and thread-like. The can be distinguished from Megaphasma denticrus (giant ) by its smaller size and lack of toothed mesofemora; from other Diapheromera species by geographic range and body proportions.
Habitat
Associated with deciduous forests, particularly rocky ridgetops and areas with abundant oak and cherry trees. Young occupy understory shrubs and trees; older nymphs and prefer oak .
Distribution
Eastern and central North America. Documented from Alabama, Arkansas, Connecticut, Delaware, Florida, and throughout the eastern United States westward to the Great Plains. Historical records from Michigan, Wisconsin, Arkansas, Oklahoma, Maryland, and Pennsylvania.
Seasonality
active primarily in late summer and autumn. overwinter; present in spring and summer.
Diet
foliage feeder. Young feed on various understory shrubs and trees; older nymphs and prefer oaks (Quercus spp.) and cherries (Prunus spp.).
Host Associations
- Quercus - primary preferred by older and
- Prunus - primary preferred by older and
Life Cycle
development with , , and stages. Eggs are deposited on the ground and overwinter. Nymphs emerge in spring and develop through multiple , with wingless adults appearing in late summer. Nymphs and adults are similar in appearance.
Behavior
Exhibits through twig-mimicking and . When stationary, extends legs forward to enhance branch-like appearance. Sways slowly back and forth when moving, simulating wind-blown vegetation. Can remain motionless for extended periods.
Ecological Role
and defoliator of deciduous trees. Periodic can significantly impact forest , though widespread damage is rare. Serves as for birds and other ; its cryptic represents a classic example of defensive .
Human Relevance
The only of economic importance in the United States. have caused complete of trees across thousands of hectares in localized historical events. Not known to bite or produce defensive chemicals. Occasionally kept in captivity by enthusiasts.
Similar Taxa
- Megaphasma denticrusLarger size (females to 150+ mm), toothed mesofemora, and restricted to south-central US distribution
- Other Diapheromera speciesDiffer in geographic range, body proportions, and male structure
Sources and further reading
- BugGuide
- GBIF taxonomy match
- iNaturalist taxon
- NCBI Taxonomy
- North America’s longest insect | Beetles In The Bush
- From the Bug of the Week mailbag: World’s largest walking stick visits the Goddard Space Flight Center, Northern walkingstick, Diapheromera fermorata — Bug of the Week
- Distribution of Diapheromera femorata(Orthoptera: Phasmatidae)1
- Distribution of Diapheromera femorata (Orthoptera: Phasmatidae)1
- Biology and ecology of the Northern walkingstick, Diapheromera femorata (Say) (Phasmatodea: Diapheromerinae): A review
- Distribution and Abundance of the Northern Walkingstick, Diapheromera femorata1, 2
- Study on the Influence of UV Light on Selective Antibacterial Activity of Silver Nanoparticle Synthesized Utilizing Protein/Polypeptide-Rich Aqueous Extract from The Common Walkingstick, Diapheromera femorata.