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Gontran
Member Rosalia
Canada
750 Posts |
 Posted - 15/12/2017 : 16:49:58
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338.68 KB
From Perak, rather small specimen,26 mm.
Thestus species? |
Gontran |
Edited by - Xavier on 15/12/2017 18:03:26 |
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Capitaine
Scientific Collaborator
France
1377 Posts |
Posted - 15/12/2017 : 17:09:20
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| I've a specimen very close labeled: Thestus alexandrae, in fact Thestus alexandra (Thomson, 1878) for Titan. This one should be a female. |
Claude |
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Gontran
Member Rosalia
Canada
750 Posts |
Posted - 15/12/2017 : 19:27:14
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| Merci Claude. |
Gontran |
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dryobius
Member Rosenbergia
USA
1408 Posts |
Posted - 15/12/2017 : 21:55:30
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I believe this is Thestus oncideroides Pascoe, 1866.
Note the hairy fringe on the antennae. Both male and female of T. oncideroides have this feature. T. oncideroides is much smaller than T. alexandra.
T. alexandra does not possess an antenna with visible fringe of hair.
Lastly, both species occur in Borneo and West Malaysia.
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Gontran
Member Rosalia
Canada
750 Posts |
Posted - 15/12/2017 : 22:42:32
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| Thank you Dan. I will look more closely at that. |
Gontran |
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Xavier
Scientific Collaborator
France
9301 Posts |
Posted - 15/12/2017 : 23:30:17
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Indeed ! Well done, Dan.
Here the original drawing of Thestus oncideroides Pascoe, 1866. |
Edited by - Xavier on 15/12/2017 23:31:03 |
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Capitaine
Scientific Collaborator
France
1377 Posts |
Posted - 16/12/2017 : 10:45:39
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| Thanks Dan and Xavier for these precisions, I take this opportunity to correct the label of my ex.(hairy) |
Claude |
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Gontran
Member Rosalia
Canada
750 Posts |
Posted - 16/12/2017 : 15:52:06
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472.54 KB
Thanks to all of you. Now, to make sure for the corrections, if the one at left is Thestus oncideroides, then at right should be T. alexandra from Sumatra, Mt. Dempo.
Even if antennae are slightly hairy underneath?. |
Gontran |
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Gontran
Member Rosalia
Canada
750 Posts |
Posted - 16/12/2017 : 16:05:22
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476.32 KB
Please, again. These from Malaysia are also T. alexandra.
Right? |
Gontran |
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dryobius
Member Rosenbergia
USA
1408 Posts |
Posted - 16/12/2017 : 23:05:37
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This key to Thestus is from an unpublished manuscript from Hudepohl based on Breuning's key.
I haven't had time to study it. And I am not familiar with Thestus chassoti.
The key does not mention the fringe on the antennae.
1 Pronotum with small tubercle instead of lateral spine 2
- Lateral spine of pronotum long and acute 3
2 Lower eye lobes distinctly longer than genae; elytra apically rounded. Thestus oncideroides
- Lower eye lobes two and a half times as long as genae; sutural angle of elytron acute, slightly prominent. Thestus chassoti Breuning
3 Sutural angle of elytron forming lobe. Thestus alexandrae
- That angle not forming lobe. Thestus philippensis |
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Gontran
Member Rosalia
Canada
750 Posts |
Posted - 17/12/2017 : 15:19:58
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| Thank you Dan. I will manage with that key. |
Gontran |
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Gontran
Member Rosalia
Canada
750 Posts |
Posted - 17/12/2017 : 16:47:56
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Dan, it's OK with oncideroides, philippensis and alexandra but my chassoti are probably alexandra (with lateral spines on pronotum), also from Malaysia.
Thanks again. |
Gontran |
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Malaysia, Thestus: oncideroides
