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Brookyman has attached these 7 pictures to aid in identification. The message is below.
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BrookymanOctober 24th, 2012, 12:13 am
Banned
Posts: 797
Hello everybody did you have a good fishing season, I had a blast.

Getting back to my personal studies now, I have come across this guy.
I collected it around April 30th . Here are photos of this enigma, I have scratched my head bald on this guy.

First one is alive at streamside ventral and dorsal views,
notice the gill coloration being a dun color like Stenacron.

Next ones after death.

And the next couple with ( internal and external anatomy removed ).
So its exoskeleton with trachea tubes and the 7th gill still attached.


The puzzle I see is. It looks like it would be a Mac ???

BUT has gills 1 - 5 pointed, 6 is round , and 7th is thread like
( no trachea.)

Gills ( 1 - 6. ) having external trachea. and It has spines on
segments 2-9


That being said, by the gills only ( is it not Stenacron ????? )

The abdominal markings, pointed segments are more like the
Mac group ???? to me or is it Femoratum ???



Look forward to hearing from you guys

Mack.
Banned for threatening another user and then trying to circumvent a kinder "soft" ban with fake accounts
EntomanOctober 24th, 2012, 3:37 am
Site Editor
Northern CA & ID

Posts: 2604
Hi Eric,

Well, at first glance the tergal/sternal striping & other markings sure look like M. vicarium. Lateral spines too. But I can see how you'd think the gills "point" to Stenacron.:) They (gills) can be tricky though. They are easily damaged which alters their appearance and also sometimes truncated gills can look rounded or even pointed depending on angle of view. I assume this specimen came from your part of PA? How big was it? Anyway, lacking further evidence, my opinion is we are looking at a March Brown. Like you though, I'm anxious to hear what others have to say.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
CrepuscularOctober 24th, 2012, 12:23 pm
Boiling Springs, PA

Posts: 915
Kurt, I'm confused, I did not post this thread. Anyway looks like Maccaffertium to me, probably vicarium, you are correct about the angle of view when lookng at these characters.



Eric
BrookymanOctober 24th, 2012, 1:12 pm
Banned
Posts: 797
Hey Kurt it was me that posted...I agree with you and Eric on maculation.

However look very close at the 3rd picture up close ventral view the 5th gill is pointed, the 6th is oval-ode, and the 7th shows clear without shadow. But i agree that it may have filaments, However we can see external trachea gills 5 and 6. Also I can not discount the gray colored gills in living photo, all the Stenacron I've gathered have gray gills, and don't see that in my "MAC" samples on the computer they all are yellowish same as the background on their abdomen. As well all my samples of Stenacron have gray gills.

Looking at the exoskeleton one you mention Kurt there is a shadow casted from the 7th that looks like trachea. We will only be sure when I dig the sample out and review it....I have thought the MAC group from day one....But those gills don't make any sense. Also I see projections on segments 2 - 9. from LEWIS forward I can't find a species with projection on the 2nd segment. My understanding is in order to be declared a projection it must surpass the segment it is on, as well as the full extension of the next segment which it seems may be the case here. ???

Never the less I have been fooled before and will be age as we all do.

As well Kurt remember back in another thread in the spring when I mentioned about peroxide and bleach that made a bubbly caustic action that push all the internal anatomy out of the cavity out. This is what it looks like after subjecting the sample too that caustic solution. RE the last pictures you can see the bubbles in the cavity still, and it looked the same two month latter when I put stuff away for the summer.

Mack.
Banned for threatening another user and then trying to circumvent a kinder "soft" ban with fake accounts
EntomanOctober 24th, 2012, 1:56 pm
Site Editor
Northern CA & ID

Posts: 2604
Wow... So sorry, guys. Senior moment, I guess. I've got three boys and am always mixing up their names. I'll know I'm in real trouble when I confuse them with their only sister...:)LOL
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

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