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> > Callibaetis sp.

Millcreek has attached these 7 pictures to aid in identification. The message is below.
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Female. Callibaetis sp. 7mm excluding cerci.
Female. Callibaetis sp. 7mm excluding cerci.
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Female. Callibaetis sp. 7mm excluding cerci.
Female. Callibaetis sp. 7mm excluding cerci.
View Full SizeView Full Size (1.6X larger)
Female. Callibaetis sp. 7mm excluding cerci.
Female. Callibaetis sp. 7mm excluding cerci.
View Full SizeView Full Size (1.5X larger)
Female. Callibaetis sp. 7mm excluding cerci.
Female. Callibaetis sp. 7mm excluding cerci.
View Full SizeView Full Size (1.5X larger)
Male. Callibaetis sp. 6mm excluding cerci.
Male. Callibaetis sp. 6mm excluding cerci.

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Males. Callibaetis sp. 6mm excluding cerci.
Males. Callibaetis sp. 6mm excluding cerci.
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Female. Callibaetis sp. 7mm excluding cerci.
Female. Callibaetis sp. 7mm excluding cerci.
MillcreekApril 28th, 2015, 11:20 pm
Healdsburg, CA

Posts: 356
These are common in the Russian River. They're usually found in cutoff pools. The pools have stagnant water with large algal growths and temperatures are higher than the river itself.

They're probably Callibaetis pictus since the adults are common at the river right now.
PaulRobertsApril 29th, 2015, 7:29 pm
Colorado

Posts: 1776
Pretty critter. They look a bit like Siphlonurus. I wonder how closely related the two might be?
MillcreekApril 29th, 2015, 10:52 pm
Healdsburg, CA

Posts: 356
Probably pretty closely related. Callibaetis belongs in Baetidae while Siphlonurus belongs in Metretopodidae generally a limb below Baetidae on a tree of life. Can be seen in common names as well: Small Minnow Mayflys for Baetidae and Primitive Minnow Mayflys for Siphlonurus.

Easiest field ID is Siphlonurus has short antennae (about head length) while Callibaetis has long antennae (about 3 or 4 times length of head).
TaxonApril 30th, 2015, 12:42 am
Site Editor
Plano, TX

Posts: 1337
Hi Mark-

while Siphlonurus belongs in Metretopodidae

I believe Siphlonurus is in family Siphlonuridae, whereas Siphloplecton is in family Metretopodidae.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
MillcreekApril 30th, 2015, 12:56 am
Healdsburg, CA

Posts: 356
Roger-

I believe Siphlonurus is in family Siphlonuridae, whereas Siphloplecton is in family Metretopodidae.


You're right, my mistake.
TaxonApril 30th, 2015, 1:59 am
Site Editor
Plano, TX

Posts: 1337
No problem, Mark. Many viewers would label me as a/r for even having mentioned it :-)
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
PaulRobertsApril 30th, 2015, 5:54 am
Colorado

Posts: 1776
Definitely mention/correct where needed, Roger. That's what makes this site so good.

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