Pimelia sp. Beetle Breeding Project

LucasDarklingz

Arachnopeon
Joined
Aug 25, 2022
Messages
15
Hello,

This is my first post on this forum and I'm French so forgive me if my English vocabulary and spelling are awkward...

In mid-May, I bought some WC Pimelia sp. from a keeper (Polyped). Actually, this is the second time I've bought Pimelia, and knowing that they're extremely rare beetles in the hobby, I once again jumped at the chance and this time set myself the project of breeding them and producing my own adults.

IMG20240617100334.jpg

For breeding, I took inspiration from this document (https://www.tandfonline.com/doi/pdf/10.1080/21686351.1970.12278016), which explains the life cycle of pimelias really well, and from the work on breeding BDFBs by Dean Rider and Aquarimax Pets.

I'll start by presenting the adult setup, then continue with my method of collecting eggs, how I incubate them and hatch them relatively quickly, and the setup for the larvae.

So this is the setup for the adults :

IMG20240620085253.jpg IMG20240608131059_BURST000_COVER.jpg

For the substrate, I basically decided to do one side with 100% sand and the other with a mix of sand, coconut fibre, sphagnum moss and humus, but I'm beginning to realize that I should have layered the substrate instead, putting the sand on top and the mix underneath.. Well, I don't think it's a big deal, considering that the adults are in great shape and live very well on the current setup.

I placed a root to give them shelter at night, knowing that they are diurnal animals and I also installed a ceramic lamp to warm up the installation and they seem to really appreciate it as they spend most of their day slumped in the sand just below.

I feed them mainly with wet bread and kitten food (richer than cat food) and it seems to suit them really well.

I've noticed that my adult females only lay eggs in the sand basically like turtles by moving the sand with their legs, so every 2-3 days I sift the sand and collect the eggs, which I push into a spoon with a brush. You have to be as delicate as possible, as the eggs burst very easily.

I then place my eggs on filter paper covered with a fine layer of sand, and place them in a perforated cricket box, which in turn is placed in a larger airtight box where the humidity is brought close to saturation point. The box is also placed on a heating mat to keep everything warm. With this technique I can hatch eggs in an average of 12 to 14 days, which is surprisingly good to me.

For better understanding, here is picture of it :

IMG20240620085306.jpg IMG20240620085341.jpg
IMG20240620085319.jpg IMG20240613100608.jpg

Now the setup for the larvae, but first, take a look at my very first larva and other larvae that have subsequently hatched :

IMG20240609202437.jpg IMG20240619090232.jpg

I placed the larvae in another, smaller tank. The substrate contains much more organic matter than in the adult tank. There's more coconut fibre and more humus. In two corners of the box I placed plastic tubes to keep everything moist.

IMG_20240620_221432.jpg IMG20240617082309.jpg

I'm more and more reluctant to make another, larger tank with even more organic matter like compost and dead leaves in addition to the current substrate, and perhaps reduce the amount of sand.

That's it, and now the next objective is to grow the larvae and, once that's done, buy a real incubator and start experimenting with pupation.

In any case, I'll try to keep you up to date on what's going on in the farm!

If you have any advice to give me about anything, my methods, my installations, let me know, I'd really like to hear your opinion too!

Alright, see you soon and thanks for reading my first thread! :)
 

Hisserdude

Arachnoking
Joined
Apr 18, 2015
Messages
2,493
Hello,

This is my first post on this forum and I'm French so forgive me if my English vocabulary and spelling are awkward...

In mid-May, I bought some WC Pimelia sp. from a keeper (Polyped). Actually, this is the second time I've bought Pimelia, and knowing that they're extremely rare beetles in the hobby, I once again jumped at the chance and this time set myself the project of breeding them and producing my own adults.

View attachment 476130

For breeding, I took inspiration from this document (https://www.tandfonline.com/doi/pdf/10.1080/21686351.1970.12278016), which explains the life cycle of pimelias really well, and from the work on breeding BDFBs by Dean Rider and Aquarimax Pets.

I'll start by presenting the adult setup, then continue with my method of collecting eggs, how I incubate them and hatch them relatively quickly, and the setup for the larvae.

So this is the setup for the adults :

View attachment 476131 View attachment 476132

For the substrate, I basically decided to do one side with 100% sand and the other with a mix of sand, coconut fibre, sphagnum moss and humus, but I'm beginning to realize that I should have layered the substrate instead, putting the sand on top and the mix underneath.. Well, I don't think it's a big deal, considering that the adults are in great shape and live very well on the current setup.

I placed a root to give them shelter at night, knowing that they are diurnal animals and I also installed a ceramic lamp to warm up the installation and they seem to really appreciate it as they spend most of their day slumped in the sand just below.

I feed them mainly with wet bread and kitten food (richer than cat food) and it seems to suit them really well.

I've noticed that my adult females only lay eggs in the sand basically like turtles by moving the sand with their legs, so every 2-3 days I sift the sand and collect the eggs, which I push into a spoon with a brush. You have to be as delicate as possible, as the eggs burst very easily.

I then place my eggs on filter paper covered with a fine layer of sand, and place them in a perforated cricket box, which in turn is placed in a larger airtight box where the humidity is brought close to saturation point. The box is also placed on a heating mat to keep everything warm. With this technique I can hatch eggs in an average of 12 to 14 days, which is surprisingly good to me.

For better understanding, here is picture of it :

View attachment 476184 View attachment 476191
View attachment 476182 View attachment 476186

Now the setup for the larvae, but first, take a look at my very first larva and other larvae that have subsequently hatched :

View attachment 476187 View attachment 476188

I placed the larvae in another, smaller tank. The substrate contains much more organic matter than in the adult tank. There's more coconut fibre and more humus. In two corners of the box I placed plastic tubes to keep everything moist.

View attachment 476189 View attachment 476190

I'm more and more reluctant to make another, larger tank with even more organic matter like compost and dead leaves in addition to the current substrate, and perhaps reduce the amount of sand.

That's it, and now the next objective is to grow the larvae and, once that's done, buy a real incubator and start experimenting with pupation.

In any case, I'll try to keep you up to date on what's going on in the farm!

If you have any advice to give me about anything, my methods, my installations, let me know, I'd really like to hear your opinion too!

Alright, see you soon and thanks for reading my first thread! :)
Thank you for this detailed account, I hope you have success in breeding these!
 

Hisserdude

Arachnoking
Joined
Apr 18, 2015
Messages
2,493
Thanks a lot! The goat of tenebrionids :eek:
I appreciate the complement! One suggestion I might give is that larvae of some related tribes are known to be at least somewhat cannibalistic as larvae, so you may want to isolate larvae after hatching for the highest survival rates.
I'm very interested to see your results, and really wish we had access to these and other exotic Tenebs here in the US.
 

Ultum4Spiderz

ArachnoGod
Old Timer
Joined
Oct 13, 2011
Messages
6,058
Very nice 👍! Looks a lot harder than raising mealworms . Which i currently am doing the beetles don’t live long.
 

LucasDarklingz

Arachnopeon
Joined
Aug 25, 2022
Messages
15
I appreciate the complement! One suggestion I might give is that larvae of some related tribes are known to be at least somewhat cannibalistic as larvae, so you may want to isolate larvae after hatching for the highest survival rates.
I'm very interested to see your results, and really wish we had access to these and other exotic Tenebs here in the US.
Thank you so much for letting me know. I've bought a hundred delicups so I think I'm going to need to start using them. I also collected a lot of dead leaves so that I could isolate the larvae and put them in a substrate richer in organic matter!
 

LucasDarklingz

Arachnopeon
Joined
Aug 25, 2022
Messages
15
Very nice 👍! Looks a lot harder than raising mealworms . Which i currently am doing the beetles don’t live long.
This is a lot harder but right now everything is going really well, I can already see the larvae growing! And since they are usually not bred at all in captivity, every accomplishment is like a miracle!
 

LucasDarklingz

Arachnopeon
Joined
Aug 25, 2022
Messages
15
Hello,

Little update.

As larvae can be canibalistic, yesterday, I separated them.

IMG20240628205729.jpg IMG20240628203717.jpg IMG20240628205803.jpg
(Also they are growing fast!!! Already 3rd moult I'd say for some of them)

I put them in delicups with the same substrate as the one used in the previous installation, and I put cat food in the bottom to give the larvae a higher protein and nutrient intake. I stole the idea from this post: https://arachnoboards.com/threads/breeding-urchin-beetle-prionotheca-coronata.354096/
Of course, they're not the same species, but knowing that they live in the same environment and have 95% of the same lifestyle, reproduction, etc., I've tried to reproduce the same method and we'll see what happens!
One thing I have to watch out for is mould.

Have a nice day!
 

PillipedeBreeder

Arachnosquire
Joined
Sep 11, 2021
Messages
84
Hello Lucas,
congratulations to your breeding success!
You‘re doing very important work here.

I see these egyptian Pimelia imported every so often, but I have yet to find anyone who bred them- except you. Thankfully you seem to be more interested in breeding these than most other people.

If I would suggest one change to your setup, I would add some decaying wood to the substrate as another food source. Either FlakeSoil or finely crushed, white rotten hardwood.
It seems to me to be a better food option than coco substrate.

Best regards
 

LucasDarklingz

Arachnopeon
Joined
Aug 25, 2022
Messages
15
Hi there!
Thanks for all the suggestions! Yes, I really like the idea of trying to breed species that hardly anyone has tried to breed yet! :)

It might have been a very good idea to add more organic material to the substrate, but perhaps for other species of tenebrion, I think. After a little discussion with The Invertebrate Dude (who is really experienced in this topic), I understood that proteins were almost key to the development and survival of larvae from tribes related to Pimelia (maybe that's why larvae are so cannibalistic).

The setup I had was quite interesting, but unfortunately it all went mouldy after 2 days... That's why I changed my method and reproduced identically the method of the thread I linked previously. I filled the delicups 1/3 full of sand and put finely crushed cat food on one side under the sand.
IMG_20240707_161425.jpg IMG_20240707_161438.jpg IMG20240707161355.jpg

And to prevent mold from appearing too quickly, The Invertebrate Dude suggested only moistening one side of the delicup (the side without the cat food, of course), and leaving the other side dry.

Thank you all for stopping by this thread, without you I'd probably have made a mess of these little things! Now I'm beginning to understand how Pimelias work, and I'm more than confident about what's to come!
 

LucasDarklingz

Arachnopeon
Joined
Aug 25, 2022
Messages
15
Hello everyone! Here's a larva that has reached its 4th instar, the largest i've got so far! Really chunky and hairy!
PXL_20240801_071730149.jpg PXL_20240801_071756599.jpg
 
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