Multicolored Asian Lady Beetle - Harmonia axyridis - BugGuide.Net

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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Polyphaga » Series Cucujiformia » Coccinelloidea » Coccinellid group » Lady Beetles (Coccinellidae) » Coccinellinae » Harmonia » Asian Lady Beetle (Harmonia axyridis)

Photo#916470

Copyright © 2014 Ross Hill

Multicolored Asian Lady Beetle - Harmonia axyridis

Medford, Jackson County, Oregon, USA
May 4, 2014

Found on the underside of an apple leaf. The abdominal dorsal scoli are three-pronged in this species. The eggs are about 1.2mm long, and the larvae about 3.2mm suggesting they are second instar (about 4 days old).

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Contributed by Ross Hill on 4 May, 2014 - 5:23pm

first instar

The only all-black instar of H. axyridis is the first. Second-instar larvae have orange markings.

At this stage, their scoli are double-branched. Late-instar larvae may have a few triple-branched scoli, but generally, H. axyridis scoli are all or nearly all double-branched. This distinguishes them from H. quadripunctata (introduced to North America, though it may not have become established); that species does have primarily triple-branched scoli.

… Abigail Parker, 6 May, 2014 - 8:10am

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Reference…

Koch mentions in his journal article here regarding the larvae of this species that "On the abdomen, the dorsal scoli are three-pronged and the dorso-lateral scoli are two-pronged".

… Ross Hill, 7 May, 2014 - 5:54pm

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on first instars?

I have seen 3-pronged scoli on 3rd and 4th instars, but never 1st or 2nd instars.

… Abigail Parker, 8 May, 2014 - 7:32am

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Any instars for abdominal dorsal scoli…

If you can provide me with a suitable reference supporting what you are saying, that is not anecdotal, that would be wonderful.

… Ross Hill, 8 May, 2014 - 2:13pm

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it's all photos

I don't know of any larval descriptions in the literature that cover first instars; most larval keys only include 4th and sometimes 3rd instars. There are some very clear photos on BugGuide of the different instars, and I've reared them from eggs myself (unfortunately I don't have a macro lens and haven't been able to photograph them as clearly as necessary.) I can find the best BG photos and list them here. And I'm happy to rear out some H. axyridis and preserve larvae of each instar, then send them to someone who can take macro or microscopic photos.

… Abigail Parker, 9 May, 2014 - 10:49am

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