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About Taxon

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  • Birthday 01/05/1941

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    WA, USA
  1. Taxon

    Slate Drake

    Hi Dubs- I believe this female subimago to be of genus Siphlonurus.
  2. Hi John- At the risk of answering a rhetorical question, no I can not; it simply boggles my imagination. :-)
  3. Hi Barry- The wings are (mostly) transparent because it's an imago, which is referred to by most flyfishers as a spinner. With regard to body length, which is measured from the front of the head to the end of the abdomen, and does not include the tails, the customary maximum length for an Isonychia velma female imago (which I believe it to be) is 21 mm, but the customary maximum length occasionally gets exceeded. For purpose of comparison, here is another Isonychia spinner:
  4. Hi Jaydub- Yes, I believe this male imago to be Isonychia velma. Incidentally, the link to my website can't be used that way, but I assume you were attempting to display the following: Family name: Isonychiidae Scientific name: Isonychia velma Previously know as: Common name: Dun Variant, Great Western Leadwing, Leadwing Coachman Locality: W CAN Regions: MEX Regions: USA Regions: NW Cent. Amer. Countries: CAN Provinces: MEX States: USA States: *01:CA, OR.*03:OR*10:CA, OR*13:CA Habitat: Voltinism: Emergence (begin) date: Jun Emergence (end) date: Oct Emergence time of day: Spinner fall time of day: Nymph minimum length: 13 mm. Nymph maximum length: 19 mm. Nymph identification keys: thin lighter dorsal stripe on mid-line of head, thorax, and abdomen; thin longituninal dorsal dash on each abdominal segment on each side of mid-line Nymph body description: claret to reddish brown Nymph legs: Nymph gills: grayish brown Nymph tusks: Nymph tails: 3, Dun minimum length: 14 mm. Dun maximum length: 18 mm. Dun identification keys: Dun body description: dark reddish brown to dark slate gray Dun wings: dark gray, large hind wings Dun legs: front dark brown tipped w/cream tarsi, rear cream, 4-segmented hind tarsi Dun tails: 2, pale dun Spinner minimum length: 11 mm. Spinner maximum length: 21 mm. Spinner identification keys: Spinner body description: thorax blackish gray, abdomen dark gray Spinner wings: hyaline, forewing venation dark brown, series of veinlets connecting CuA and rear margin Spinner legs: front gray, rear cream to yellow, fore tibia reddish, hind tarsi 4-segmented Spinner tails: 2, medium gray Created: 05/02/2009 Last modified: 04/09/2016 www.FlyfishingEntomology.com
  5. The most obvious clue to its sex is the absence of claspers, which it would have were it a male. So, I identified it as a female. Please see my previous post.
  6. Hi Dubs- I believe this female subimago to be of genus Stenacron.
  7. To be fair, it may need stating that Mayfly Central currently lists (649) species of mayflies found in N. America, only (9) of which have recognized subspecies: Anthopotamus neglectus disjunctus Anthopotamus neglectus neglectus Caenis diminuta diminuta Callibaetis ferrugineus ferrugineus Callibaetis ferrugineus hageni Drunella grandis flavitincta Drunella grandis grandis Drunella grandis ingens Ephemerella dorothea dorothea Ephemerella dorothea infrequens Maccaffertium mediopunctatum arwini Maccaffertium mediopunctatum mediopunctatum Maccaffertium mexicanum integrum Maccaffertium mexicanum mexicanum Maccaffertium terminatum placitum Maccaffertium terminatum terminatum Timpanoga hecuba hecuba Timpanoga hecuba pacifica http://www.flyfishingentomology.com/Mayfly%20Species%20Distribution%20Maps.htm
  8. As this thread is over six years old, please allow me to provide an update concerning the number of mayfly species by state, which is based on my digest of the following pertinent scientific papers: *01: Distribution of mayfly species of North America, by R. P. Randolph, supplemented by the following: *02: Mayflies (Ephemeroptera) of the far western United States: Part I: Washington) by M. D. Meyer & W. P. McCafferty *03: Mayflies (Ephemeroptera) of the far western United States: Part II: Oregon) by M. D. Meyer & W. P. McCafferty *04: Additions and Emendations to The Mayflies (Ephemeroptera) Fauna Of Saskatchewan, Canada by J. M. Webb, et. al. *05: The Ephemeroptera Of North Carolina by S. R. Beaty *06: Pennsylvania Mayflies by G. A. Hoover *07: Insecta, Ephemeroptera: New Alabama state records by W. P. McCafferty & J. M. Webb *08: Insecta, Ephemeroptera: Range extensions and new records for Ontario and Canada by McCafferty, Jacobus, Webb, Meyer *09: Mayflies (Insect: Ephemeroptera) of Nevada, Unites States of America by W. P. McCafferty, R. P. Randolph *10: USGS NPWRC - Mayflies of the United States - coordinated by B. C. Kondratieff *11: A New Species of Mayfly from WV by B. C. Kondratieff and M. D. Meyer *12: The Mayflies (Ephemeroptera) Of Alaska by R. P. Randolph and W. P. McCafferty *13: Mayflies (Ephemeroptera) of the far western United States: Part III: California by M. D. Meyer & W. P. McCafferty *14: Insecta, Ephemeroptera: New and additional records for New York by Meyers, Jacobus, Kondratieff *15: New Records Of Mayflies (Ephemeroptera From Alberta, Can. by J. P. Webb and W. P. McCafferty *16: Insecta, Ephemeroptera: range extensions and new Iowa state records by McCafferty, Hubbard, and Webb *17: Nunavut Mayflies (Ephemeroptera) A Supplement For Far Northern North America by R. P. Randolph & W. P. McCafferty *18: A New Species of Caenis (Ephemeroptera: Caenidae) from Florida, USA by M. L. Pescador & B. A. Richard *19: Cercobrachys fox: Guenther & McCafferty, 2005; Sun & McCafferty, 2008; Guenther & McCafferty, 2008 *20: Cladistics, classification, and identification of the brachycercine mayflies (Caenidae) by Lu Sun & W. P. McCafferty *21: A new species and new synonym in Heptagenia ... by J.B. Webb, W.P McCafferty, and V. R. Ferris *22: A New Genus and Species of Small Minnow Mayfly from Far Northern North America by W. P. McCafferty *23: A New Species of Maccaffertium Bednarik (Ephemeroptera: Heptageniidae) by W. P. McCafferty *24: A New Species of (Baetidae); First Representative of Genus North of Mexico by W. P. McCafferty *25: Contributions to the larvae of N. American Nixe (Ephemeroptera: Heptageniidae) ... by W. P. McCafferty & M. D. Meyer *26: Insecta, Ephemeroptera: Transcontinental range extensions in western North America by F. M. Webb & W. P. McCafferty *27: A New Species of Acentrella from New York and New England by S. K. Burian & L. W. Myers *28: A New Species of Mayfly from West Virginia by B. C. Kondratieff & M. D. Meyer *29: BoldSystems - Public Data Portal - Specimen Record - Nixe joernensis by L. M. Jacobus *30: A New Genus And New Species of Baetidae from lakes and reservoirs in eastern North America by Hill, Pfeiffer, & Jacobus *31: Contributions to the Systematics of Leucrocuta, Nixe, and Related Genera (Ephemeroptera: Heptageniidaeby W. P. McCafferty *32: Phylogenetic Systematics of the Potamanthidae (Ephemeropters) by Y. J. Bae and W. P. McCafferty *33: A Revision of Subgenus Drunella by R. K. Allen and G. F. Edmunds, Jr. *34: Mayflies (Ephemeroptera) of the Great Plains. I: Nebraska by McCafferty, Kluggertanz, Randolph, Provonsha, Lawson, Kondratieff *35: Mayflies (Ephemeroptera) of the Great Plains. II: Iowa by McCafferty, Hubbard, Klubertanz, Randolph, Birmingham *36: Mayflies (Ephemeroptera) of the Great Plains. III: North Dakota by J. L. Guenther and W. P. McCafferty *37: Mayflies (Ephemeroptera) of the Great Plains. IV: South Dakota by J. L. Guenther and W. P. McCafferty *38: South Carolina Mayflies (Ephemeroptera) by W. P. McCafferty and M. D. Meyer *39: A new species of Labiobaetis Novikova & Kluge, 1987 (Ephemeroptera: Baetidae) from Washington, USA by J. M. Webb *40: Revisionary contributions to North American Ephemerella and Serratella (Ephemeroptera: Ephemerellidae) by L. M. Jacobus & W. P. McCafferty *41: Preliminary survey of the mayflies (Ephemeroptera) ... of Big Bend Ranch State Park & Big Bend Natl. Pk. by D. E. Baumgardner & D. E. Bowles *42: A revision of the genus Leptohyphes Eaton (Ephmeroptera: Leptohyphidae) in North and Central America by D. E. Baumgardner & W. P. McCafferty *43: New Species Synonyms and Records on North American Centroptilum and Procloeon (Ephemeroptera: Baetidae) by N. A. Wiersema & W. P. McCafferty *44: New and Additional Records of Mayflies (Ephemeroptera) from the Southwestern Unuted States by D. E. Baumgardner *45: The mayflies (Ephemeroptera) of New Hanpshire: Seasonality and Diversity of the Stream Fauna by Chandler, Whitmore, Burian, Burger *46: Insecta, Ephemeroptera, Baetidae: Range extensions and new state records from Kansas, U.S.A by W. P. Mccafferty & L. M. Jacobus *47: Insecta, Ephemeroptera: Range extensions and new state records from far western Montana by W. P. McCafferty & R. L. Newell *48: New records (of Plauditus cestus) from Virginia and the Northwest Territories, with notes on color variation by Gorski, Fox, McQueen, and Jacobus *49: Geographic range extention to Wyoming, USA for Paraleptophlebia praepedita by Ashley Garlick, B. C. Kondratieff, and L. M. Jacobus *99: A DNA Barcode Library for North American Ephemeroptera: etc. by Webb, Jacobus, Funk, et. al. NC 212 SC 185 NY 181 PA 178 CA 162 ME 162 IN 156 TN 154 VA 148 OR 147 GA 142 AL 140 WI 132 OH 126 TX 126 MI 123 NH 122 KY 121 IL 117 WA 115 IA 112 WV 109 CO 107 CT 107 MO 107 MT 106 ID 100 OK 95 AR 90 ND 85 NE 85 MN 84 FL 81 UT 81 SD 80 NM 79 AZ 72 KS 67 WY 61 MS 50 AK 48 MA 46 MD 44 NV 37 LA 34 VT 28 DE 12 NJ 10 RI 0
  9. You're certainly welcome. Best regards,
  10. Hi letumgo, Thanks for your kind words, even though it has taken nearly (10) years for me to see your post. It appears that the link to my article is no longer accessible, so I have hosted Entomology Bookshelf on my website. Best regards,
  11. Hi wschmitte- Most female mayfly imagoes lay their eggs within 24 hours of having them fertilized by the male imago. After those mayflies lay their eggs, it takes a several weeks for the eggs to mature, and for each nymph to break out of its respective egg. However, several genera of mayflies retain the eggs within their abdomen for a week or more following fertilization, which allows their eggs to mature, so that the nymph is able to escape its egg immediately.following the egg being laid, which is what we see happening in the video. Best regards,
  12. Taxon


    Hi jmckarghan- I believe this link will give you a good start. http://www.flyfishingentomology.com/The%20Basics%20Of%20Flyfishing%20Entomology.htm Best regards,
  13. Yes, that's pretty much it. The mature male and female nymphs emerge as duns, and shortly thereafter, they shed their exoskeletons for the final time and become spinners, which then mate. This is followed by the female laying her eggs, and then both male and female spinners expire.
  14. Hi Evan- Well, the majority of mayflies live approximately one year, a week or so as an egg, then another 11+ months as a maturing nymph, then another day of so as a dun (subimago), and then another day or so as an spinner (imago). But, other mayfly species may live for no more than three months, and have two or three generations during the course of a calendar year. However, I suspect your question actually relates to how long a mayfly lives once it has emerged from its nymphal lifestage and taken wing. So, the answer to that question would be, anywhere from less than an hour, to more than a week, depending on the species and sex of the mayfly. Hope this adequately answers your question. If not, just fire away.
  15. Taxon

    giant Stonefly

    JSzymczyk- Yes, Pteronarcys. There are (5) species known from PA: P. biloba (Knobbed Salmonfly) P. comstocki (Spiny Salmonfly) P. dorsata (American Salmonfly) P. pictetii (Midwestern Salmonfly) P. proteus (Appalachian Salmonfly) Differentiating between them requires microscopic examination of genitalia.
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