Rhyssella humida
(Say, 1835)
Rhyssella humida is a of ichneumon in the . Females possess an exceptionally long used to drill into wood to reach . The species is and has been documented in North forested .
Pronunciation
How to pronounce Rhyssella humida: //raɪˈsɛlə ˈhjuːmɪdə//
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Identification
Distinguished from similar by the combination of activity, association with woody , and the extremely long in females. Separated from the Rhyssella nitida by subtle morphological differences in body proportions and coloration; precise identification requires examination of and abdominal structure. The Rhyssella is distinguished from related genera by features of the areolet in the and the structure of the ovipositor .
Images
Appearance
-sized ichneumon with a slender body and long . Females have an elongated, thread-like extending well beyond the tip. Body coloration is dark with possible reddish or brownish tones. are membranous with characteristic .
Habitat
Forested areas with standing dead timber and decaying logs. Associated with hardwood forests where wood- occur.
Distribution
Documented from eastern and central North America. Records include Kansas and surrounding states. The full extent of the range requires further documentation.
Seasonality
active in spring, with observations in late March through April in Kansas. The period likely extends through the growing season in temperate regions.
Host Associations
- Xiphydria - of wood- in this are the known . Female drills into wood to oviposit on host .
Behavior
. Females use the long to drill through wood and on or near wood- . The resulting larva feeds as an external , eventually killing the . have been observed at blacklights, suggesting some movement or attraction to light sources despite primarily daytime activity.
Ecological Role
of wood-boring , contributing to of these primary wood . Part of the complex associated with dead and dying hardwood trees.
Human Relevance
Occasional visitor to blacklight setups used for surveys and citizen science projects. No known direct economic impact; contributes to natural of wood- .
Similar Taxa
- Rhyssella nitidaCongeneric with similar biology and appearance. Distinguished by subtle differences in body proportions and possibly coloration; both share the characteristic long and lifestyle on wood-.
- Ophion spp. frequently attracted to blacklights. Separated by shorter , different , and primarily nocturnal activity pattern.
- Dolichomitus spp.Large with extremely long . Distinguished by larger body size, different patterns, and often more build.
More Details
Taxonomic note
Authority sometimes cited as Tavani, 1955 in some databases, though original description by Say, 1835 is the accepted authorship.
Observation context
One of the most frequently documented observations comes from the City Nature Challenge 2024 in Leavenworth, Kansas, where a female was photographed and described as 'spectacular' due to the prominent .