All Porcellionides pruinosus and Porcellionides floria in the United States should be left at genus level.

All Porcellionides pruinosus and Porcellionides floria should be left at the genus level. Most if not all of the identifications here on iNaturalist are based on the size of the white banding on the antennae or orange-tented uropods to distinguish the two Porcellionides sp. in the United States; however, this has been proven to be very inconsistent within populations.

It's more reliable to look at the length vs. width of the flagellum and the apical peduncle article. P. pruinosus have much shorter and stubbier peduncles and flagella, contrasting with P. floria which has noticeably longer and skinnier peduncles and flagella. Granted, this is still subject to variation and not all populations in the Porcellionides pruinosus "complex" have been examined for this either. Currently, the only way to tell these two apart, aside from molecular sequencing, is with a mixture of the tubercles, scale setae, and antennae; the former is difficult to judge and the second needs a very high magnification microscope. Even then you can't be certain due to how poorly defined P. pruinosus and P. floria are. For this reason; I would recommend keeping all Porcellionides pruinosus and Porcellionides floria at the genus level.

Posted on November 12, 2022 04:52 PM by blastcat blastcat


Would it be appropriate to put these species in a species complex? I do see that "Porcellionides pruinosus complex" does show up in a few papers, so it wouldn't be out of line for iNaturalist to have it in its taxonomy. I don't know enough about these species to create the complex and what observations to push back to complex level, but it seems like it might help here.

Here are a couple articles I found just in a quick search:

New insights in the Porcellionides pruinosus complex (Isopoda, Oniscidea): Biological, behavioural, and morphological approaches
Wolbachia diversity in the Porcellionides pruinosus complex of species (Crustacea: Oniscidea): evidence for host-dependent patterns of infection
Targeted genome enrichment for efficient purification of endosymbiont DNA from host DNA (mentioned in the last paragraph before the references section)

Posted by ajamico about 1 year ago

I would not be against adding a species complex. @astrobirder @aniedes and @ponerinecat what do y'all think?

Posted by blastcat about 1 year ago

I think a species complex would be reasonable to add.

Posted by aniedes about 1 year ago

@loarie, @highwaytohellgrammite, and @cloclo53 before I add this complex, what do you think?

Posted by blastcat about 1 year ago

I have no particular comment as I don't know P.floria but from what I can read this is probably the best option.

Posted by cloclo53 about 1 year ago

Yeah adding the complex to iNat seems reasonable here.

Posted by highwaytohellgram... about 1 year ago

Thank you for the replies, I have added the taxon:

Posted by blastcat about 1 year ago

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