Joon
Full Member
Macrotomini
Posts: 141
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Post by Joon on Apr 3, 2013 8:45:39 GMT -8
Hello guys, I recently received an interesting Callipogon sp. from Brazil.
The size is about 78MM.
Its trianglular shape of clypeus reveals that it's not Callipogon friescheiseni. I compared with my three Callipogon frieschiseni. The shapes of protonum and clypeus are clearly different from C. friescheiseni.
I think this is either Callipogon sylvainae or Callipogon similis. Callipogon sylvainae is a new species (2011). Callipogon sylvainae occurs in French Guiana and Venezuela. Thus, I assume they occur in northern Brazil.
Cheers,
Joon
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Joon
Full Member
Macrotomini
Posts: 141
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Post by Joon on Apr 3, 2013 8:53:45 GMT -8
side view
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Post by prillbug4 on Apr 3, 2013 14:49:22 GMT -8
Based on the mandibles and the range, I would say that it is actually Orthomegas frischiseni (Lackerbeck), 1998. Orthomegas sylvainae was not recorded from Brazil.
Jeff Prill
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Joon
Full Member
Macrotomini
Posts: 141
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Post by Joon on Apr 3, 2013 15:05:02 GMT -8
I can guarantee you that this is not frischeiseni .
1. Orthomegas frischeiseni has a different shape of clypeus. I have three frischeiseni with similar clypeus shape. I considered variations but they all have similar clypeus shape. I read about the clypeus of callipogon species in a scientific journal written by Mr. Alain. You can refer to the Revision of genus Orthomegas.
2. Also, the shape of protonum is clearly different. I compared all three protonums. Frischeiseni has spikes protruding in a different angle. The unknown Callipogon has spikes protruding in a different angle and do not have prominent spikes as frischeiseni.
3. Even major callipogon marechali and callipogon similis have vertical tooths and similar mandible size.
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Post by Borja Gómez on Apr 3, 2013 15:29:31 GMT -8
Hello
For me looks like sylvainae too after a review of the paper "revision of the genus Orthomegas", and the key leads to sylvainae or similis, but the pronotum shape of your specimen is more similiar to sylvainae.
It's the mandible strongly punctured like the specimen pictured in the paper? I can't distinguish from the photo.
Regards
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Joon
Full Member
Macrotomini
Posts: 141
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Post by Joon on Apr 3, 2013 15:59:57 GMT -8
clypeus and protonum shape Attachments:
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Joon
Full Member
Macrotomini
Posts: 141
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Post by Joon on Apr 3, 2013 16:12:39 GMT -8
Hey Borja! Yes, the mandible is strongly punctuated. It's either orthomegas similis or orthomegas sylvainae. Attachments:
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Post by Borja Gómez on Apr 3, 2013 17:02:53 GMT -8
Hello
According to the key and images of the paper, similis mandibles are smooth or very softly punctued, so it can be only sylvainae under my opinion.
Also if you check the 4th segment of the antenna in a male, in sylvainae the pore must be disimmetrical, in contrast with frischeiseni male wich must have simmetrical pores.
Regards
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Post by bichos on Apr 4, 2013 4:58:26 GMT -8
I find this group frustraitingly confusing with specimens of C. frischeiseni from different localities being somewhat variable...
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Joon
Full Member
Macrotomini
Posts: 141
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Post by Joon on Apr 4, 2013 6:34:01 GMT -8
Yes the genus orthomegas is very confusing. But I love them! I think it's fun to learn how to separate species based on small details  |
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