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TaxonomyBrowseInfoImagesLinksBooksData
Photo#1187479
Entomobrya? - Entomobrya atrocincta

Entomobrya? - Entomobrya atrocincta
El Paso, El Paso County, Texas, USA
January 30, 2016
It reminds me of Entomobrya nigrocinta

Moved
Moved from Entomobryinae.

Entomobrya atrocincta sensu Katz & al 2015, female

 
Okay... I give up :)
Should this be another No Taxon page under E. atrocincta, like the "forma pseudoperpulchra" page here?

 
No
Entomobrya atrocincta sensu Katz & al 2015 = E. atrocincta page of Bugguide. The sensu clause is used for there are currently 3 homonymic E. atrocincta's worldwide. 2 in the US and one in the rest of the world.
The sensu Katz refers to the sexually dimorphic form in the US.
The forma pseudoperpulchra refers to the non dimorphic form in the US.
(In the rest of the world we have E. atrocincta sensu Jordana.)

 
I despair of ever understanding the taxonomy of these critters..
...but I will try to be as helpful as I can. :)

So... This should be placed on the main E. atrocincta page. Easy enough; I can do that.

Unfortunately, I'm still confused (imagine that). E. atrocincta sensu Katz seems quite similar to E. nigrocincta (E. nr nigrocincta), which is also sexually dimorphic. But these are two distinct species, correct?

 
Indeed...
the taxonomy of these Entomobrya species is confusing due to subsequent historical taxonomic decisions.
Short history:
Ramel & al 2008 : dimorphic E. atrocincta : female looks like multifasciata.
Jordana 2012: non US dimorphic E. atrocincta sensu Ramel & al 2008 = dimorphic E. nigrocincta.
Katz & al 2015 : US dimorphic E. atrocincta : female looks like multifasciata
In due time I have tried to follow the subsequent taxonomic decisions. And we have tried to implement at Bugguide using the 'cf' and 'forma' tricks. E.g. E. cf. nigrocincta was used to idy records of specimens between 2012-2015.
But now taxonomists do not consider E. nigrocincta present in the US.
To answer your question: atrocincta and nigrocincta are 2 different dimorphic species (and lookalikes). E. atrocincta sensu Katz & al is found in the US. E. nigrocincta in Europe.
So any E. (cf/nr) nigrocincta record now in Bugguide should be transfered to E. atrocincta.

 
Clear as mud :)
So... the specimens we originally moved from E. atrocincta to E. nr. nigrocincta, should be moved back to E. atrocincta, and the E. nr. nigrocincta page should be deleted. Correct?

That will leave us with a main E. atrocincta page--which will hold those specimens ID'd as "sensu Katz" and those previously placed in E. nr. nigrocincta--and a No Taxon page for E. atrocincta forma pseudoperpulchra. Also correct?

 
100% correct
I knew you would get it right, eventually ;-)
Remember that this will not be the end of the story. Taxonomy is like living matter. Always changing. Ramel 2008, Jordana 2012 and Katz 2015 are just 3 steps in the pathway to solve the atrocincta mistery. This is how science works. Step by step. The current situation of 3 atrocincta's worldwide will have to be resolved. If that happens, I'll be back ;-)
BTW, you can see the progress made at www.collembola.org : I kept in the captions of the images of atrocincta3 (= sensu Katz) the identifications that were applicaple at the times the images were uploaded.

 
Great! Thank you Frans and Ken!
I value your expertise and kind help.

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