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Vitali
Member Rosenbergia
Estonia
1014 Posts |
 Posted - 27/12/2012 : 23:26:25
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My first try at new Forum.
A species with very distinctive antennae. Hopefully, not very difficult to identify. West Kalimantan.
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Gerard
Scientific Collaborator
France
5441 Posts |
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Vitali
Member Rosenbergia
Estonia
1014 Posts |
Posted - 28/12/2012 : 10:58:31
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Hello, Gerard. Why "silly"? Was my question that simple?
Thank you for the hint. As I understand, a female is shown in the photo of Noel Mal. It has only one swollen antennomere, while my male specimen has three. Is this correct with this species?
PS. I have a feeling that there is a confusion with name. Opposite to Francesco Vitali - my first name is Vitali and family name is Nagirnyi. |
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Gerard
Scientific Collaborator
France
5441 Posts |
Posted - 28/12/2012 : 12:34:23
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Pardon pour ce mot mal traduit.
J’utilise un traducteur automatique qui donne des fois des fautes.
Toutes mes excuses.
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Gerard
Scientific Collaborator
France
5441 Posts |
Posted - 28/12/2012 : 12:42:46
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| C’est tout a fais normal les femelles ont moins de tubercules sur les antennes, la photo de Noel est bien une femelle et le tien un male. Tu trouveras sur le forum deux autres espèces. |
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Vitali
Member Rosenbergia
Estonia
1014 Posts |
Posted - 28/12/2012 : 13:22:12
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Thank you once more, Gerard! By the way, an excellent Web site by Noel Mal. I did not know it.
PSS. I had no doubt the reason was in translator  |
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dryobius
Member Rosenbergia
USA
1895 Posts |
Posted - 28/12/2012 : 21:14:37
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I think Noel Mal's Triammatus is T. tristis (or near). Definitely not T. saundersi
The image posted above is T. saundersi, however the color of the specimen is unusual, perhaps due to the camera.
In Borneo, I know of 4 spp. of Triammatus: T. chevrolati, T. saundersii, T. subinermis & T. tristis (or near)
T. tristis might be a morph of T. chevrolati. In the numerous specimens I have seen, there is somewhat of a convergence of the elytral markings which is confusing.
I would post some photos here except I would have to shrink the size of my jpg files to fit to 500 k limit.
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dryobius
Member Rosenbergia
USA
1895 Posts |
Posted - 28/12/2012 : 22:54:47
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Triammatus saundersii
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T. tristis (or near) male
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T. tristis (or near) female
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T. chevrolati |
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dryobius
Member Rosenbergia
USA
1895 Posts |
Posted - 28/12/2012 : 22:58:48
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T. chevrolati
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dryobius
Member Rosenbergia
USA
1895 Posts |
Posted - 28/12/2012 : 23:00:26
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| I tried to post 2 more pics (chevrolati & subinermis) but something is blocking me ... hmmm |
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dryobius
Member Rosenbergia
USA
1895 Posts |
Posted - 28/12/2012 : 23:21:39
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T. chevrolati
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T. subinermis
What confuses me about Triammatus tristis is that the type locality is Batchian {Batjan}, which is on the other side of Wallace's Line from Borneo. My experience is that there are only a few species which occur on both sides of this line. Also, as I mentioned above, sometimes there are forms of T. chevrolati or T. tristis which look a little like some kind of hybrid.
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Gerard
Scientific Collaborator
France
5441 Posts |
Posted - 28/12/2012 : 23:55:44
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Merci Dan
Voici T. chevrolati Pascoe, 1860
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MALAISIE Cameron IV.2005
T.waigeuensis Gilmour, 1950
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INDONESIE Irian Jaya Timika III.1999 |
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Gerard
Scientific Collaborator
France
5441 Posts |
Posted - 29/12/2012 : 00:04:15
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Reste a trouver Triammatus brunneus Breuning, 1947 pour avoir toutes les especes décrite de ce genre.  |
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Vitali
Member Rosenbergia
Estonia
1014 Posts |
Posted - 29/12/2012 : 13:20:39
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Dear Dan. Great to meet you here. Thank you and Gerard for the photos of Borneo species.
It seems however that none of them fits my specimen because of the following features (I am not sure how important these are from the diagnostics point of view):
1) The pubescence is almost white, only slightly grayish (the camera is not guilty); I am adding here a lateral view, which shows this even better;
2) The color pattern with 6 white longitudinal lines in the first quarter of elytra is different from all other species;
3) The area of shiny grains is restricted to the first quarter of elytra like in T. chevrolati.
4) Antennae are completely black, practically no shade of brown.
5) The sculpture of pronotum with transverse wrinkles resembles only that of T. subinermis, but other features are different.
Finally, may be an exact locality can help. It is Mount Bawang.
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Vitali
Member Rosenbergia
Estonia
1014 Posts |
Posted - 29/12/2012 : 13:30:40
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| I forgot to mention also a deep groove between antennae in the head. Is this the same in other species? All photos are taken from different angles. |
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dryobius
Member Rosenbergia
USA
1895 Posts |
Posted - 29/12/2012 : 15:09:33
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Vitali, I think you're specimen is not any of the four species that are known to me from Borneo.
Almost every one of my Bornean cerambycids is from Sabah or Sarawak. Borneo is a huge island with many undescribed species, even from Sabah. No one can estimate how many more will be found in southern Borneo.
As I mentioned, tristis & chevrolati may be extreme forms of the same species... but I am not sure of that. But your beetle is not either of those.
Your specimen has the 3rd antennal segment longer than than the 3rd antennal segment of my male T. saundersii. Yes, there are other differences, too. When pubescence on a specimen gets rubbed off, it becomes hard to tell what has happened.
I was told by a colleague that my only specimen of T. subinermis is a very close match to the illustration in Breuning's paper. Maybe sometimes, T. subinermis has more pubescence.
Well, I think all I can say now is that you could have an undescribed species. I have never seen T. brunneus Breuning (type locale: Sumatra) or a photo of it. I would expect it to be "brunneus" in color, however it was described by Breuning which means very little.
I still have 10-15 unidentified / undescribed Monochamini from Sabah. A few are Acalolepta, but there are other genera, too. |
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West Kalimantan: Triammatus
