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Can all members of Therea interbreed?


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In theory it's possible, but I am unaware of anyone who actually interbred these species. That's not to say it can't be done, but I don't think anyone's really made the mistake of keeping two Therea together in the same enclosure, (at least not in conditions needed to breed), and no one seems to really want to. 

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6 hours ago, Allpet Roaches said:

It might be a good experiment.

I admit, it would be cool to create an "orange question mark" hybrid, or something along those lines, only if it were done well though and we didn't end up with unlabeled hybrids in the hobby like we did with Blaberus and Gromphadorhina... 

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  • 4 years later...

Hello, I would like to resurrect this old thread which came up in a Google search....I've always kept my colonies of Domino and Question Mark separate....its not that difficult to do given that they have distinct patterns and a general size difference with Domino being larger in my experience. They were acquired some 4-5 years ago from a reputable roach breeder/aficionado. Due to colony growth I now have split those two colonies into 4...two of each species. 

Recently I sold a group of 12 or so of the Question Mark roaches....we always provide the largest nymphs in the colony. The buyer got back with me after a few weeks with a picture of a recently molted adult with an unusual pattern....a pattern that resembles a "flag" waving in the wind. I let them know its not uncommon to have weird patterns show up on occasion with roaches in the Therea genus. I have pictures of Therea roaches which are practically all white for example.

When I went to feed/mist the colony that contained the largest nymphs....hence the one we bring to reptile shows and sell out of....I was surprised to see approximately two dozen adults all with the same "flag" pattern that the earlier buyer had shown me. As of this typing there are no adults in the colony which have the expected "?" mark pattern. There are currently over 2-3000 nymphs in this colony....I am enjoying what I refer to as a "bloom" wherein many large nymphs molt into adults at the same time. I'm gonna have a hell of a show this time next year! (and I'll earn my advanced "Roach Wrangler" badge as these guys are quick)

Anyways....my first thought on seeing two dozen with all the same pattern was the possibility of Domino adults having bred with QMs inside this bin. But, the odds of that are extremely slim given my anal approach to keeping all my bins secure from other roaches and other pests like spiders and whatnot. And I thought, although the odds of a single female getting into the bin is greater then multiple females getting into the bin...given that I mist and feed these colonies weekly, if I came across a Domino in the QM bin (or visa versa) I would of immediately pulled it out....how could a single female of laid so many oothecae into the substrate in a relatively short time. I mean the adults only live 4-5 months, with feeding/misting weekly that's 16-20 opportunities for me to of seen this possible Domino female(s) and get her out of there. I've never seen an adult Therea species in the wrong tub in the 4-5 years I have kept them....never.

 

So my questions to others is....how many ootheca(e) does a single female Question Mark/Domino roach lay during their short adult lifespan ?

If these are hybrids due to one or more Domino roach females getting into the QM tub.....shouldn't I expect to see the more common '?' pattern in the vast majority of the adults within the colony ?

If the colony winds up having nothing but these "flag" patterns....and I'm talking about the possibility of thousands over the next 12 months...at what point do we have a different Therea species on our hands...or at least a different "strain" like we might see with Blaberus craniifer for example ?

 

Pictures and a link to a video available soon....

 

Mike

 

 

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2 hours ago, whowadat said:

Hello, I would like to resurrect this old thread which came up in a Google search....I've always kept my colonies of Domino and Question Mark separate....its not that difficult to do given that they have distinct patterns and a general size difference with Domino being larger in my experience. They were acquired some 4-5 years ago from a reputable roach breeder/aficionado. Due to colony growth I now have split those two colonies into 4...two of each species. 

Recently I sold a group of 12 or so of the Question Mark roaches....we always provide the largest nymphs in the colony. The buyer got back with me after a few weeks with a picture of a recently molted adult with an unusual pattern....a pattern that resembles a "flag" waving in the wind. I let them know its not uncommon to have weird patterns show up on occasion with roaches in the Therea genus. I have pictures of Therea roaches which are practically all white for example.

When I went to feed/mist the colony that contained the largest nymphs....hence the one we bring to reptile shows and sell out of....I was surprised to see approximately two dozen adults all with the same "flag" pattern that the earlier buyer had shown me. As of this typing there are no adults in the colony which have the expected "?" mark pattern. There are currently over 2-3000 nymphs in this colony....I am enjoying what I refer to as a "bloom" wherein many large nymphs molt into adults at the same time. I'm gonna have a hell of a show this time next year! (and I'll earn my advanced "Roach Wrangler" badge as these guys are quick)

Anyways....my first thought on seeing two dozen with all the same pattern was the possibility of Domino adults having bred with QMs inside this bin. But, the odds of that are extremely slim given my anal approach to keeping all my bins secure from other roaches and other pests like spiders and whatnot. And I thought, although the odds of a single female getting into the bin is greater then multiple females getting into the bin...given that I mist and feed these colonies weekly, if I came across a Domino in the QM bin (or visa versa) I would of immediately pulled it out....how could a single female of laid so many oothecae into the substrate in a relatively short time. I mean the adults only live 4-5 months, with feeding/misting weekly that's 16-20 opportunities for me to of seen this possible Domino female(s) and get her out of there. I've never seen an adult Therea species in the wrong tub in the 4-5 years I have kept them....never.

 

So my questions to others is....how many ootheca(e) does a single female Question Mark/Domino roach lay during their short adult lifespan ?

If these are hybrids due to one or more Domino roach females getting into the QM tub.....shouldn't I expect to see the more common '?' pattern in the vast majority of the adults within the colony ?

If the colony winds up having nothing but these "flag" patterns....and I'm talking about the possibility of thousands over the next 12 months...at what point do we have a different Therea species on our hands...or at least a different "strain" like we might see with Blaberus craniifer for example ?

 

Pictures and a link to a video available soon....

 

Mike

 

 

You could have had a single MALE domino get into your ? colony, breed with some females, and then die pretty quickly afterwards (males are shorter lived than females, and in a large healthy colony it could have easily evaded detection IMO). That sounds like the most plausible option to me, especially since isolating a specific morph of ?s would have likely taken a lot more effort than that, whereas some roach hybrids have more vigor than their pure bred counterparts and could easily outcompete their pure bred parent stocks in the same container (not to mention, interbreed with them and make all the individuals in there hybrids after a generation or two).

So, IMO, it sounds like you're got a hybrid culture, which you should isolate and perhaps destroy, or at the VERY LEAST, label correctly as T.petiveriana X T.olegrandjeani.

You could also try purposely making hybrids in another bin, and compare them to these "flagged" individuals of yours, just to confirm that they are in fact hybrids. But I'd definitely hold off on selling any more from that colony, short term profit isn't worth potentially causing properly labeled, pure stock Therea spp. to become scarce, like we're seeing with other roach genera in the hobby... Mislabeled hybrids are quite simply, a cancer in this hobby.

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