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GONZO | October 3rd, 2010, 12:37 pm | |
Site Editor "Bear Swamp," PAPosts: 1681 | I believe that this is actually Isogenoides hansoni. When Dr. Chandler and Luke Myers made earlier "Cultus" comments on this specimen, they seem to have missed the prominent submental gills shown in photo #5 (and #7). In addition to the submental gills (more than 2X as long as wide), the pale area on the 10th tergum, the distinct enclosed pale "M" mark on the head, and (often) the elongated pale spot in the center of the head are a few of the distinctive traits of this species. A complete description and a depiction of the dorsal habitus (figure #88) can be found in Sandberg and Stewart (Holomorphology and Systematics of the Stonefly Genus Isogeniodes, 2005). The type specimens of I. hansoni were collected from my old homewaters on the Brodheads in 1937 by Preston Jennings (the author of the classic A Book of Trout Flies). Cultus verticalis is a smaller, pale yellowish nymph, typically with a bolder, simpler dorsal pattern and less intricate markings on the dorsal surface of the head/thorax. | |
Title | Replies | Last Reply |
Acroneuria specimen moved from genus to species level In Acroneuria carolinensis Stonefly Nymph by Entoman | 0 | |
Re: Anybody know the genus and species? In Isogenoides hansoni Stonefly Nymph by Troutnut | 8 | Feb 12, 2009 by Troutnut |
Re: identification needed In Rhithrogena impersonata Mayfly Nymph by Kinza | 2 | Feb 6, 2017 by Crepuscular |
Moved to Acroneuria lycorias In Acroneuria lycorias Stonefly Nymph by Entoman | 0 | |
Re: Which species is this? In Acroneuria abnormis Stonefly Nymph by Troutnut | 4 | Mar 11, 2012 by Entoman |
Re: Yakima River Light Cahill In the Identify This! Board by Drywaters | 6 | Dec 20, 2016 by Troutnut |
Re: Arcynopteryx In Isogenoides hansoni Stonefly Nymph by Taxon | 3 | Nov 9, 2011 by Entoman |
Re: Black stonefly In General Discussion by LittleJ | 5 | Nov 19, 2007 by Flybyknight |
Re: Heptageniidae ID request In the Identify This! Board by Willmilne | 6 | Nov 15, 2008 by GONZO |
Re: Probably Agnetina capitata In Agnetina capitata Stonefly Nymph by GONZO | 5 | Mar 23, 2011 by Jmd123 |