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Trichoptera, perhaps Chimarra? - Namamyia plutonis

Trichoptera, perhaps Chimarra? - Namamyia plutonis
Near upper reaches of the Trinity River, south of Scott Mountain, Trinity County, California, USA
May 25, 2008
A caddisfly (Trichoptera)...the most similar looking thing I could find to it on BugGuide was Chimarra...perhaps a longshot.

It was perching on foliage of what I think is Incense Cedar (Calocedrus decurrens). [Port Orford Cedar (Chamaecyparis lawsoniana) was also growing at this locale, but the foliage in this photo looks more like that of Incense Cedar.]

Images of this individual: tag all
Trichoptera, perhaps Chimarra? - Namamyia plutonis Trichoptera, perhaps Chimarra? - Namamyia plutonis

Moved from Caddisflies.

Disregard this comment (Posting error...couldn't delete!)

wing length
is the wing over 0.5 inch long? How about Namamyia plutonis. Chimarra are normally less than 0.5 inches long. Great photos.

Namamyia a good candidate
I didn't measure the wing length, but I'd estimate it to be > 13mm = 0.5 inches. So, as you suggest, it's unlikely Chimarra. Moreover, the description of Namamyia plutonis at this link is encouraging---the characters described there seem to fit well, e.g.:
  • "jet black throughout";
  • "antennae much shorter than wings, basal joint longer than head, clothed with long, semi-erect hairs";
  • and regarding tibial spurs: "subapical pair of middle tibiae at end of second third" (of the length of the tibia, I presume).
Also, Namamyia plutonis seems consistent, at least as far as I can tell, with the keys in (the somewhat old) "Aquatic Insects of California"(1). That reference states that male Namamyia have 5-segmented maxillary palpi. If I'm interpreting things correctly, the caddisfly in my photo has 4-segmented palpi...which I guess would make it a female if it is indeed N. plutonis. (See the 2nd image in series for detail of palpi.) But I'm just an amateur, so I may have erred at various junctures.
    At any rate, thanks for your input...seems to me you may have hit the mark!

    The maxillary palps of both sexes are five segmented - there is one more small one close to the head that is not apparent in the photo. I am not aware of an obvious sexual dimorphism that will separate the sexes from your photos.
    Your assumption on the tibial spur measurement is correct. It is great you found an original description. The U of Minn. site is a wonderful source for caddis info, especially for south of the states.


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