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Utah Stone - Zapada cinctipes

Utah Stone - Zapada cinctipes
City Creek Canyon, Salt Lake City. (N40°47.123'W111°52.903'ele1418m), Salt Lake County, Utah, USA
March 13, 2011
Size: 8.63mm head/wing
Many other individuals noted. ID suggestions appreciated, I'm leaning towards Zapada, maybe Z. haysi based on a very old unpublished key by Gaufin.

Images of this individual: tag all
Utah Stone - Zapada cinctipes Utah Stone - Zapada cinctipes Utah Stone - Zapada cinctipes

Moved from Spring Stoneflies.

Zapada haysi will only have 4 simple gills. Your specimen appears to have gills with 4 branches each.

Thanks for the input. Pardon my confusion (I'm good at it). When referring to gills, would that mean one on each side? My ancient key (type written with a ribbon) has cinctipes with gills branched at least once (less than six branches). I'm counting six filaments on each side, at least the more lateral one does seem to be branched. Seems to make sense (so far, almost).

Simple gills (unbranched filaments ?) seem to be characteristic of columbiana and haysi, with the species difference being constrictions at the base or near the base of the gills. Is there also a difference in the number of filaments between these species, you mention that haysi has four simple gills?

I realize that I'm asking for a fair amount of information, trying to get a handle on this group before checking on some mountain streams prior to spring runoff.

Thanks again

For the western species of Za
For the western species of Zapada, six of the seven species (frigida, haysi, columbiana, oregonensis, cordillera, and glacier) have simple, unbranched cervical gills so there will be four gills total. Only Z. cinctipes has branched gills. Each gill will have 3-4 branches so 12-16 total branches. Remember, too, that adult Malenka and Amphinemura will also have branched cervical gills.

Many thanks!
Your clarifications are very helpful in understanding what the key is referring to. Will need to make sure to get better shots of these features.

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