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> > Amiocentrus aspilus

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MillcreekMarch 6th, 2015, 11:08 am
Healdsburg, CA

Posts: 356
These are common in the Russian River and Mill Creek. They're usually
present from February through June. These were keyed out using Merritt, Cummins and Berg (2008).

The first few pictures were taken of specimens preserved in alcohol and they have lost most of their color. The pictures were taken to show some of the features which separate them from Brachycentrus and Micrasema spp.

Cases are approximately 15 mm long and larvae about 10 mm long. They're usually found on torrent sedge or algae laden rocks.
MartinlfMarch 6th, 2015, 12:12 pm
Palmyra PA

Posts: 3233
features which separate them from Brachycentrus and Micrasema spp.

Mark, could you elaborate, specifying those features? Also thanks again for the photos. Stunning.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
MillcreekMarch 6th, 2015, 1:51 pm
Healdsburg, CA

Posts: 356
Mark, could you elaborate, specifying those features?

Brachycentrus would have different legs, with a longer femora and a tibia with a prominent spur.

Micrasema would have the pronotal groove curving anteriorly, with the ends of the groove usually meeting the anterior margin.

Amiocentrus would have a shorter femora, a tibia without a prominent spur,
the ends of the pronotal groove not meeting the anterior margin and a mesonotal sa1 with a solitary setae on each side.
CrepuscularMarch 7th, 2015, 7:09 am
Boiling Springs, PA

Posts: 923
Nice post Mark! I see a fair number of Micrasema here in PA. I love seeing your western bugs!
GutcutterMarch 7th, 2015, 9:48 am

Posts: 470
Way cool! Great photos, as usual, Mark
All men who fish may in turn be divided into two parts: those who fish for trout and those who don't. Trout fishermen are a race apart: they are a dedicated crew- indolent, improvident, and quietly mad.

-Robert Traver, Trout Madness
MillcreekMarch 7th, 2015, 10:10 am
Healdsburg, CA

Posts: 356
Eric and Gutcutter-

Thanks, glad you enjoyed them.

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