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Photo#2066394
Hippodamia on Helianthus annuus - Hippodamia

Hippodamia on Helianthus annuus - Hippodamia
Sevenmile Creek, 8 km NW of Helena, Lewis and Clark County, Montana, USA
September 14, 2021
Size: 6.9 mm
Orange coccinellid climbing on upper stem of flowering Helianthus annuus, small black spots on each elytron along with one transverse black bar. Collected. Ruderal floodplain community with Kochia scoparia, Chenopodium simplex, Chenopodium berlandieri, Helianthus annuus, and Cleome serrulata. Midday to early afternoon, sunny, 66 F to 73 F, gentle to fresh W breeze, good air quality.

Elevation ca 4000 feet. Disturbed riparian corridor on stream restoration site within a patchwork of native and non-native grassland.

Hippodamia quinquesignata? Used the Hippodamia key in Gordon 1985 and got to the group of H. quinquesignata, caseyi, glacialis, and moesta. Of these, this looks most like quinquesignata, with the posterolateral corners of the pronotum completely black.

This was one of several coccinellids observed here this fall on upper stems of Helianthus annuus. Michaud & Qureshi 2006 (1) report H. convergens visiting sunflowers in the dry part of the summer to obtain moisture and possibly nutrition from sap, so presumably that may have been what was happening here.

Images of this individual: tag all
Hippodamia on Helianthus annuus - Hippodamia Hippodamia on Helianthus annuus - Hippodamia

Moved
Moved from Hippodamia.

Moved

Moved
Moved from Hippodamia.

Revisited this one with Acorn's 2007 field guide along with Gordon 1985. Pronotal pattern does not match H. caseyi, and elytral markings are not thick and confluent enough for H. moesta bowditchii. So that at least narrows it to H. glacialis lecontei or H. quinquesignata quinquesignata. According to Acorn, H. g. l. does not have white slashes on the pronotum, while H. q. q. sometimes does, but that does not help with this individual.

However, based on Tim Moyer's comments here and revisiting the relevant text in Gordon, it appears that we can *tentatively* eliminate H. g. lecontei because the black on the pronotum reaches the margin here, vs. "rarely reaches the pronotal border or even close to it" in H. g. lecontei (Gordon, p. 744). *However, the H. g. lecontei image in Acorn's book shows the black reaching the pronotal margin - so it looks like this is a case where dissection is going to be required for certainty.

Moved
Moved from ID Request.

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