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Supposedly the main taxonomical difference between the two species is that G. porteri has more well defined lyra on the retrolateral palpal coxa and prolateral coxa of leg I than G. rosea. Looking at these 2 it does seem that way.
*EDIT* It seems that people have been using this thread in a lot of Facebook groups every time the difference between G. rosea and G. porteri comes up as some sort of definitive proof. So just for some clarification, it is not part of some taxonomic work by either myself, Steve Dye, Colin Wilson or any other name that is being banded about. It is not even saying that this is a stable character to use. It merely shows the difference between stridulating organs of one red female and one grey/brown female which was a character that was getting thrown around the hobby at the time (I'm guessing based on Andrew Smith's article in the BTS journal Vol 6 No.1 as well as what was said in lectures by Fernando Perez Miles and Pedro Avaria).
Sorry but it is not the holy grail of posts that you are looking for to define the 2 species.
Just out of interest, I did compare 5 more specimens about 3 years ago (3 "porteri", 2 "rosea" iirc) and found that the lyra on the prolateral coxa of leg I was very variable between the two but that the "porteri" specimens all had more lyra on the retrolateral palpal coxa than any of the "rosea".
G. rosea
Retrolateral palpal coxa
Prolateral coxa leg I
G. porteri
Retrolateral palpal coxa
Prolateral coxa leg I
G. rosea used
G. porteri used
*EDIT* It seems that people have been using this thread in a lot of Facebook groups every time the difference between G. rosea and G. porteri comes up as some sort of definitive proof. So just for some clarification, it is not part of some taxonomic work by either myself, Steve Dye, Colin Wilson or any other name that is being banded about. It is not even saying that this is a stable character to use. It merely shows the difference between stridulating organs of one red female and one grey/brown female which was a character that was getting thrown around the hobby at the time (I'm guessing based on Andrew Smith's article in the BTS journal Vol 6 No.1 as well as what was said in lectures by Fernando Perez Miles and Pedro Avaria).
Sorry but it is not the holy grail of posts that you are looking for to define the 2 species.
Just out of interest, I did compare 5 more specimens about 3 years ago (3 "porteri", 2 "rosea" iirc) and found that the lyra on the prolateral coxa of leg I was very variable between the two but that the "porteri" specimens all had more lyra on the retrolateral palpal coxa than any of the "rosea".
G. rosea
Retrolateral palpal coxa
Prolateral coxa leg I
G. porteri
Retrolateral palpal coxa
Prolateral coxa leg I
G. rosea used
G. porteri used
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