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Vitali
Member Rosalia
Estonia
994 Posts |
 Posted - 29/12/2012 : 20:43:33
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| The length of antennal segments and the shape of their swellings seem to be good diagnostic characters. These make my specimen close to T. saundersii and T. subinermis. The pubescence is very well preserved in my specimen and this allows seeing a striking difference from T. saundersii in the shape and pubescence of scutellum (close to T. subinermis, only margins have dense pubescence). And yet, antennae are slenderer in T. subinermis. I am almost ready to believe this is a new species. |
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Vitali
Member Rosalia
Estonia
994 Posts |
Posted - 31/12/2012 : 13:23:19
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I have not found all original descriptions yet, but I found a book by Pascoe “Longicornia Malayana”, 1864-1869, in which in pages 232-233, he reproduces the descriptions of 3 species: T.saundersii, T. chevrolati and T. tristis. It was interesting to find, that his description of T. saundersii fits well my specimen, but not the photo placed by Dan.
The most important features are copied here:
“…the elytra with small, more or less confluent, spots of black and white ...“
„... a broad pure white line beginning in a small point at the base of the eye, and continued along the sides to the posterior margin of the metasternum...“
„ prothorax finely corrugated, the lateral spine slender towards the apex ...“
„... scutellum subtransverse, truncate posteriorly ...“
„... two pale lines on each side the scutellum, the inner the shorter ...„
„... antennas of the male ashy at the base, the dilated portions and rest of the antennae blackish...“
Beside the other characters, the scutellum is really different in Dan's "T. saundersii". It is almost triangular, not truncated apically and fully pubescent.
The scutellum in my beetle corresponds well to the Pascoe's description. Moreover, a bit above in p. 232 after the genus description, there is a comment concerning an undescribed species with a triangular scutellum.
There is no indication of pubescent bands on the dorsal side in pronotum, as in Dan’s specimen. And finally, one of the most striking differences: look at the very strong preapical depression in pronotum of Dan’s beetle. I guess this is a unique character.
Dan, it seems on the basis of the Pascoe's work, that rather my beetle is T. saundersii, while yours is not. It might be a new species.
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jplami
Member Rosalia
France
656 Posts |
Posted - 25/09/2016 : 12:24:10
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Dans l'ordre des photos, je propose les noms suivants
1 et 9) Triammatus saundersii Chevrolat, 1856
2) Triammatus rukasatochini Jiroux&al., 2016
3 et 4) Triammatus bayai bayai Jiroux &al., 2016 (male et femelle) bien que les formes sont plutôt brunes
5) Triammatus bayai binigromaculatus Jiroux &al., 2016 bien que la forme est brune
6) Triammatus subinermis Breuning, 1955
7) Tiammatus chevrolati Pascoe, 1857
8) Triammatus tristis juheli Jiroux &al., 2016 (femelle)
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Lamiaires du Monde • Lamiines of the World • Cerambycidae Lamiinae |
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dryobius
Member Rosenbergia
USA
1887 Posts |
Posted - 25/09/2016 : 14:25:09
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I have not seen Jiroux's paper yet, but he has sent me photographs and he has graciously paratyped some material from my collection.
I do not totally agree with the subspecies "binigromaculatus" as it seems to occur in essentially the same area as the nominate subspecies. Komiya created the same type of subspecies with one of his Aegolipton's. Sometimes, the markings on elytra are quite variable within a species. |
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Vitali
Member Rosalia
Estonia
994 Posts |
Posted - 26/09/2016 : 13:46:14
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| Thank you, Jean-Philippe. I am glad my suggestions have been confirmed. |
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Malpertuis
Member Purpuricenus
Belgium
108 Posts |
Posted - 01/10/2016 : 14:20:37
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quote:
Originally posted by dryobius
I think Noel Mal's Triammatus is T. tristis (or near). Definitely not T. saundersi
How, it's possible to confirm the determination as T. tritis ?
So we have to correct in Brussels Museum collection. |
World Wide Beetles |
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dryobius
Member Rosenbergia
USA
1887 Posts |
Posted - 02/10/2016 : 13:17:41
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I am waiting on a copy of Jiroux's new paper. So, I can't agree or disagree with all of previous opinions.
I also have Triammatus like # 1 from Kalimantan. Based on a few photographs exchanged between Jiroux and myself, I thought they were now T. bayai. This posting now is now very long with photographs of many species, and it is confusing. Of course, this genus has been very confusing for a long time.
Hudepohl's collection undoubtedly is large with many species mis-identfied. He called my specimens of T. bayai as T. tristis. He called my specimens of T. rukasatochini as T. saundersii. I am sure there are many collections with similar problems.
Later, I will post some of my species individually.
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West Kalimantan: Triammatus
