Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

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Neoleptophlebia Mayfly Nymph Neoleptophlebia Mayfly Nymph

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington

Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.

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27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.

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Stonefly Species Soliperla thyra (Roachflies)

Species Range

source

Physical description

Most physical descriptions on Troutnut are direct or slightly edited quotes from the original scientific sources describing or updating the species, although there may be errors in copying them to this website. Such descriptions aren't always definitive, because species often turn out to be more variable than the original describers observed. In some cases, only a single specimen was described! However, they are useful starting points.

Description from GBIFthe Global Biodiversity Information Facility

Source: California Soliperla Ricker, 1952 (Plecoptera: Peltoperlidae), Distribution And Taxonomic Characters

Male epiproct. Stark & Gustafson (2004) presented an image (Fig. 19 in Stark & Gustafson) of the epiproct from Glenn County specimens in which the epiproct stem gradually becomes wider near the apex and the lateral margins of the anterior face do not extend beyond those of the stem. In addition, the anterior face was 252 µm wide and heavily armed with a total of 37 marginal and submarginal teeth in 3 + rows. The specimen of Soliperla thyra in our study from Napa County (Figs. 6 - 7) has the anterior face distinctly wider than the stem (175 µm, but narrower than that of the Glenn County specimen) and has smaller and far fewer (21) teeth. Male aedeagus. Stark (1983) described and illustrated this distinctive structure from the holotype and from Napa County specimens. Herein, we provide additional images of the structure from a Humboldt County specimen. In all specimens examined by us, the ventral surface of the aedeagus bears a pair of prominent, curved spines that arise from sclerites (Fig. 12). Additional small setal spines occur along the anterolateral margins (Fig. 13). Larval abdominal pigment patterns. Stark (1983) described the larva of this species from Napa County specimens. In those specimens, terga 4 and 7 have small, circular, median pale spots and the median tergal spot on segment 5 is similar in shape to the lateral spots. In our study of Glenn County specimens the median spot on tergum 4 is absent and the median spots on terga 5 - 6 are similar in size and shape (Fig. 16).Source: California Soliperla Ricker, 1952 (Plecoptera: Peltoperlidae), Distribution And Taxonomic Characters

http: // lsid. speciesfile. org / urn: lsid: Plecoptera. speciesfile. org: TaxonName: 102 Figs. (6 - 7, 12 - 13, 16)

Start a Discussion of Soliperla thyra

References

Jacobus, L. M., Wiersema, N.A., and Webb, J.M. 2014. Identification of Far Northern and Western North American Mayfly Larvae (Insecta: Ephemeroptera), North of Mexico; Version 2. Joint Aquatic Science meeting, Portland, OR. Unpublished workshop manual. 1-176.