A few genera (this one, Phrosia, and Synchysa) show up in Delininae on iNat, in CoL, and/or on bugguide, but are placed in Scathophaginae on BOLD. I'm not sure where either taxonomy comes from in the literature. Can anyone confirm what the current taxonomy says?
@ceiseman @waldgeist @stephenluk @treegrow @edanko

Bernasconi & Šifner, 2021 have Synchysa & Parallelomma in Scathophaginae, and they put Phrosia in Cordilura, so Phrosia albilabris is a synonym of Cordilura albilabris.

I would have thought the placement of Synchysa & Parallelomma in Scathophaginae was based on molecular phylogenetic data, but neither genus is included in Bernasconi et al., 2000 and I can't find any follow-ups on that paper. It wouldn't be the first time that taxonomic changes are made based on unpublished data. It may be worth contacting Marco Bernasconi if you really want to get to the bottom of this.

I just got around to writing to Marco Bernasconi--I couldn't find an email for him, but I messaged him on ResearchGate. I asked him what the reasoning was for moving Synchysa to Scathophaginae. I also asked him why the 2021 list has no mention whatsoever of the type species of Americina, which is a Nearctic species, A. adusta. Ozerov (2009) believed A. adusta actually belongs to the genus Cordilura, so he synonymized Americina with Cordilura and transferred adusta to that genus (which is in Scathophaginae). Unless that action was reversed at some point, listing any species under Americina is incorrect. The only explanation that would make sense is that adusta has since been synonymized with one of the two Americina species that was described before it, media or vittata. Since they list no Americina species as occurring in the Nearctic region (not even vittata, which certainly occurs here), that seems unlikely. The list also indicates all three Nearctic Neochirosia species as occurring in the Afrotropical region and not the Nearctic region, so it's clear that there's a lot of sloppiness in this paper...

Your mention of Ozerov has jogged my memory about something. In this 2015 paper by Ozerov and Krivosheina, they write:

The family Scathophagidae is not currently divided into subfamilies, although this question is under discussion (Jong 2000; Šifner 2003, 2008).

If Ozerov doesn't believe the traditional subfamilies of Scathophagidae are valid, then it doesn't surprise me that he'd synonymize genera in a way that disrupts the composition of Delininae. In fact, in this article from 2023, Ozerov and Krivosheina do not split their checklist into subfamilies, and they move all the species of Parallelomma (where Ozerov put most of the former Americina species in 2009) to Leptopa (Delininae again, per Bernasconi & Šifner 2021 🤷‍♂️).

Not being that familiar with dung flies, Ozerov's taxonomic changes feel a bit careless (or at least, not that strongly justified in his papers). Even if they're right, I can see why Bernasconi & Šifner's checklist might end up wonky with respect to subfamilies.

Oh that's interesting about Leptopa, I hadn't heard of that genus until today, when I saw that Šifner had described a species from Colorado a while back. If Ozerov is right, that species is likely to be a leafminer too.

I have no objection

It's become clear to me that the Parallelomma of Šifner and the Parallelomma of Ozerov are entirely different genera, because they disagree on the type species (Cordilura albipes for Šifner and Codilura vittata for Ozerov). Šifner's P. albipes and P. fuscipes are placed in Cordilura by Ozerov and Krivosheina 2023, whereas Ozerov's Parallelomma species are all placed in Americina by Bernasconi & Šifner 2021.

No, I don't think so. Šifner (2008) recognizes adusta as the type of Americina. That's not the only genus that Bernasconi & Šifner recognize while excluding the type species: Phrosia albilabris (the type of Phrosia) was moved to Cordilura based on genetic evidence, but they continue to recognize Phrosia remmi in Phrosia. As you said, the 2021 checklist contains multiple obvious errors.