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Neivamyrmex opacithorax


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#21 Offline Ant_Dude2908 - Posted May 8 2020 - 10:05 AM

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I found it interesting that there was a specimen of N. nigracens collected in South Dakota: antmaps.org


Doesn't surprise me. Neivamyrmex nigrescens have a very wide distribution range.
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#22 Offline Canadant - Posted May 8 2020 - 2:09 PM

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So are you gary? Nice to meet you, if so. Also, if so, my name is Brian.

Cool vids. Amazing macro images. Such hairy faces. Wild.
"You don't get what you want. You get what you deserve".

#23 Offline PurdueEntomology - Posted May 8 2020 - 2:12 PM

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So are you gary? Nice to meet you, if so. Also, if so, my name is Brian.

Cool vids. Amazing macro images. Such hairy faces. Wild.

Yes, I am Gary, Thanks. Nice to meet you Brian.


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#24 Offline PurdueEntomology - Posted May 8 2020 - 2:33 PM

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My process of feeding Neivamyrmex.

I need to weigh out minimally 8 grams of brood food which currently is either brood of Solenopsis invicta or subterranean termites.  I will upload soon a video of how I collect Solenopsis invicta brood in the field.

 

I house the field collected brood/fire ants in larger fluon lined trays.  When I am preparing to feed I remove a quantity of brood with soil into the small fluon lined container in the photo and place a piece of shard for the ants to collect the brood under.  This allows for me to more easily separate brood from excess soil. I allow them to settle and collect the brood under the shard which usually takes half an hour or so.  I use a vacuum to remove any excess ants and most of the soil after the brood has been gathered under the shard as in the photo.   I collect the brood and weigh it out with remaining soil and aspirate as many fire ants as I can out of the brood. I place the aspirated ants in vial in freezer to kill them for disposal. 

covered food brood
uncovered food brood
scale And measuring Cup

 


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#25 Offline PurdueEntomology - Posted May 8 2020 - 3:29 PM

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Outcome: 13grams of brood-food.


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#26 Offline nurbs - Posted May 8 2020 - 3:39 PM

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Nice thread! Do they have space to forage and move extended distances? (like a maze where they can traverse long distances within a confined space)

 

Just curious how that effects their behavior in captivity.


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#27 Offline gcsnelling - Posted May 8 2020 - 4:06 PM

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That mandible sure looks like N. opacithorax to me.


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#28 Offline PurdueEntomology - Posted May 8 2020 - 4:19 PM

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Nice thread! Do they have space to forage and move extended distances? (like a maze where they can traverse long distances within a confined space)

 

Just curious how that effects their behavior in captivity.

Yes, there are three containers each 24"x16"x7"  interconnected with 5/8" wide tubing with the possibility of connecting more.


Edited by PurdueEntomology, May 8 2020 - 4:21 PM.

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#29 Offline PurdueEntomology - Posted May 9 2020 - 1:40 PM

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Guard Duty 3
Guard Duty 2
Guard Duty 1

 

A few shots of brood-food being taken to nest while sisters are on guard duty...real army ant like!.  


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#30 Offline ponerinecat - Posted May 10 2020 - 8:22 AM

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Maybe rename this journal to opacithorax?



#31 Offline PurdueEntomology - Posted May 10 2020 - 12:16 PM

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Maybe rename this journal to opacithorax?

Yes, but I have not figured out yet how to do that.  Do you know how?



#32 Offline madbiologist - Posted May 10 2020 - 12:28 PM

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You just edit the title by editing the first post.

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Colonies: Aphaenogaster fulva x2, Aphaenogaster rudis x2, Camponotus americanus x2, Camponotus chromaiodes x2, Camponotus herculeanus, Camponotus novaeborascensis, Camponotus pennsylvanicus x2, Camponotus subbarbatus, Crematogaster cerasi, Creamtogaster cf. lineolata (2 queens), Formica pallidefulva, Formica subaenescens, Lasius americanus, Lasius aphidicola x4 (hosts), Lasius neoniger x5, Tapinoma sessile x2, Temnothorax curvispinosus, Tetramorium immigrans.

Queens: Camponotus chromaiodes, Camponotus novaeborascensis, Camponotus pennsylvanicus, Temnothorax ambiguus (2 queen group), Temnothorax curvispinosus (21 queen group), Temnothorax curvispinosus x3 (18 queens, 11 queens, 7 queens), Temnothorax smithi/schaumii (2 queen group).

 

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#33 Offline PurdueEntomology - Posted May 10 2020 - 12:34 PM

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You just edit the title by editing the first post.

Sent from my Pixel XL using Tapatalk

Thank you for your guidance.



#34 Offline PurdueEntomology - Posted May 10 2020 - 3:00 PM

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Neivamyrmex opacithorax eggs which seem to be transitioning to larvae...finally.  The eggs are kept in small clusters attended to by workers, which is similar to how food-brood is also enclosed in the bivouac mass of workers individually and collectively consumed.  

N. opacithorax Egg

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#35 Offline Ant_Dude2908 - Posted May 10 2020 - 4:20 PM

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Neivamyrmex opacithorax eggs which seem to be transitioning to larvae...finally.  The eggs are kept in small clusters attended to by workers, which is similar to how food-brood is also enclosed in the bivouac mass of workers individually and collectively consumed.


My colony also has about a thousand or so medium larvae.
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#36 Offline PurdueEntomology - Posted May 12 2020 - 8:13 AM

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Neiv. opacithorax larvae
 
The yellow circle indicates larvae and eggs.  The red ovals around gasters seem to indicate these brood attending workers are well fed. Could it be they are feeding the larvae directly?  Since the larvae are still in clumps and not individually being attended I am not certain as to how they are being fed.  This is the first time I have noticed workers with such distended gasters as this seems to be only with those that are attending brood.

Edited by PurdueEntomology, May 12 2020 - 8:17 AM.

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#37 Offline PurdueEntomology - Posted May 14 2020 - 12:43 PM

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NOTE:

 

I have observed that the early instar larvae of N. opacithorax are kept in the bivouac as small clusters tended by workers.  They are NOT placed on the brood-food to feed it seems, though I suspected they would have the larvae feed like that, similar to how a Stigmatoma would lay its larvae on a paralyzed centipede to feed.  As noted in the above photos the brood attending workers have distended gasters which must be from engorging themselves.  I am now under the suspicion that the early instar larvae are actually being fed directly by brood attending workers.  Since upon two examinations of the bivouac I have NOT seen any larvae placed on any brood-food and the fact that attending workers have distended gasters I am inclined to think larvae are being fed directly.  I have not read in the literature how Eciton-group type (Eciton, Nomamyrmex and Neivamyrmex) care for early or late instar larvae to confirm or deny my "hunch". 


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#38 Offline PurdueEntomology - Posted May 15 2020 - 3:33 PM

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The larvae are growing!!

 
Neivamyrmex opacithorax maturing larvae

 


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#39 Offline VenomousBeast - Posted May 15 2020 - 4:03 PM

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Mmmmm, they look like noodles XD I want to slurp them up! But in all seriousness, congrats man!! This is awesome!!


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-Haden Lee
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1 Savannah Monitor (cause I don't have the heart to give her up and send her away while I'm on my mission, She's my pride and joy!)

 

NOTES: I'm about to leave on a mission for my church (September 2nd, 2020-September 2022) to Mexico City, Spanish speaking. 


#40 Offline PurdueEntomology - Posted May 15 2020 - 5:17 PM

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Mmmmm, they look like noodles XD I want to slurp them up! But in all seriousness, congrats man!! This is awesome!!

Thanks!  I agree, they are awesome! Baby steps, baby steps, one day at a time.  


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