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> > Psychoglypha sp. larvae



Millcreek has attached these 7 pictures to aid in identification. The message is below.
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Intermediate instar. Approximately 10 mm. case length.
Intermediate instar. Approximately 10 mm. case length.
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Intermediate instar. Approximately 10 mm. case length.
Intermediate instar. Approximately 10 mm. case length.
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Late instars. Approximately 20 mm.
Late instars. Approximately 20 mm.
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Late instar. Approximately 20 mm.
Late instar. Approximately 20 mm.
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Side sclerites. One way to distinguish from other species.
Side sclerites. One way to distinguish from other species.
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Case. Late instar. Approximately 20 mm.
Case. Late instar. Approximately 20 mm.
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Case. Late instar. Approximately 20 mm.
Case. Late instar. Approximately 20 mm.
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MillcreekMarch 23rd, 2015, 7:57 pm
Healdsburg, CA

Posts: 356		These larvae are found in slack water and pools in Mill Creek (tributary to the Russian River). They begin to show around March and are pretty much gone by September. The cases change from small ones with redwood or Douglas fir needles to larger ones incorporating pieces of bark, small pieces of gravel and relatively large sticks.
CrenoMarch 23rd, 2015, 10:09 pm
Grants Pass, OR

Posts: 305		looks like at least two species there - the one at the top has banded legs. There are lots of species that are quite difficult to separate. It is likely that many records have been mis-determined. Most species don't have adequately described larvae.
MillcreekMarch 23rd, 2015, 10:59 pm
Healdsburg, CA

Posts: 356		Yeah, the one at the top apparently is different. It would be interesting to
see if they change as they get older. Other than the banded legs they appear quite similar.
CrenoMarch 24th, 2015, 12:08 am
Grants Pass, OR

Posts: 305		I don't think things like leg banding coloration will change. The color patterns should get more distinct with later instars. Most changes will occur with the addition/size of secondary setae/gills with later instars.
MillcreekMarch 24th, 2015, 12:39 am
Healdsburg, CA

Posts: 356		Interesting. I'm going to have to go back to my vials and see if I can find some with banded legs as later instars. Also see if other changes occur. I'll keep you posted.
CrepuscularMarch 24th, 2015, 6:41 am
Boiling Springs, PA

Posts: 923		nice
MillcreekMarch 24th, 2015, 12:38 pm
Healdsburg, CA

Posts: 356		I went back and looked through my vials. Found the original one with banded legs. It was the only one out of about 70 with banded legs. Either an aberration or another species. The others of that age range were quite close in appearance except for the legs.
PaulRobertsMarch 24th, 2015, 8:34 pm
Colorado

Posts: 1776		The "non-mammalian protrooberances" are different too. The dorsal hump on the first is nearly a spike. Nifty.
MillcreekMarch 24th, 2015, 11:37 pm
Healdsburg, CA

Posts: 356
The "non-mammalian protrooberances" are different too. The dorsal hump on the first is nearly a spike.


The "protooberances" are the same on all early instars. They get blunter as the larva matures.
CrenoMarch 25th, 2015, 3:07 pm
Grants Pass, OR

Posts: 305		The spacing humps of the 1st abdominal segment ("non-mammalian protrooberances" thought to be useful in respiration) are highly flexible, muscled, and, when viewed closely, have many small scales, setae, etc. They are retractile/extensile and, as such,the shape would be expected to be highly variable within both live and preserved material. I am not aware of the actual shape of the spacing humps having been used for taxonomic significance although their presence/absence, setation, scleritization, etc. is often used.
Jmd123March 25th, 2015, 11:45 pm
Oscoda, MI

Posts: 2611		"non-mammalian protrooberances"

OK guys, I jut have to laugh...does this remind anyone else of Frank Zappa??? LOL seriously!!!

;oD

Jonathon
No matter how big the one you just caught is, there's always a bigger one out there somewhere...

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