Fungus-eating lady beetles

I got a start on tackling verification of IDs for this genus, but got stuck:

There's this handy guide, but it appears to be more challenging than what the guide shows:

Especially out in California, where the twenty-spots look like the kidney-spots to me.

@silversea_starsong, can you help clarify the distinguishing features?

Publicado el agosto 9, 2017 01:02 TARDE por pfau_tarleton pfau_tarleton


The bugguide page references this book, which is available in full online:
I did a ctrl-F search on Psyllobora and found the figures illustrating the species:

Looks like this is one of those cases where you need to look at genital structure to ID if the markings are too similar.

Publicado por nanofishology hace casi 7 años

Genitalia is only required for 1 in a few hundred specimens. The two species are remarkably different once you are used to them. I have personally not encountered a specimen where genitalia were necessary.

In California the ID is easy because there 20-maculata has a special form with both brown and black markings simultaneously (what I refer to as "bicoloured" in my notes). Renifer has only black or brown markings, not both.

Outside of California where both species have only black markings, you can look at the side spot. This spot is usually reduced or entirely missing in renifer, while it is complete and well present in vigintimaculata (including the CA form).

The actual marking formation overall is different too but its hard to explain those differences without practice.

Publicado por silversea_starsong hace casi 7 años

Bugguide has no real information on the ID. I'll fix that page at some point.

I made a post for someone else on this site last time, that might give you more insight:

Publicado por silversea_starsong hace casi 7 años

Thanks yall! What excellent work you've done, James! Johnny Nash's song, I Can See Clearly Now, is playing in my head.

Publicado por pfau_tarleton hace casi 7 años

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