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Rhantus sp. - Dytiscidae
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Autore:  AdYRuicanescu [ 13/12/2013, 15:06 ]
Oggetto del messaggio:  Rhantus sp. - Dytiscidae
I have received a pair of this species of Rhantus sp. from Eastern Romania. Unfortunately I have not a key for Rhantus in this area or for Europe. In this page (http://coleoptera.ksib.pl/search.php?l=en) there are good pictures, but not aedeagi provided.
I think it is Rh. latitans Sharp, 1882, but I need a confirmation.
Unfortunately, the specimens were killed in 98% alcohol, then kept dry in a glass tube, so no specimen has antennae and the anterior and middle tarses of the male are missing.
Thank you in advance.

Rhantus_m_Forum.jpg


Male dorsal view

Aedeagus lateral view
Rhantus_m_aed1pn_Forum.jpg


Aedeagus - lateral view

Aedeagus ventral view
Rhantus_m_aed2_Forum.jpg


Aedeagus ventral view

Left paramer
Rhantus_m_aed1_pm_Forum.jpg


Left paramour

Female dorsal view
Rhantus_fd_Forum.jpg


Female dorsal view

Female ventral view
Rhantus_fv_Forum.jpg


Female ventral view
Autore:  Rafał Celadyn [ 13/12/2013, 16:24 ]
Oggetto del messaggio:  Re: Rhantus sp. - Dytiscidae
Hi!
...for me R.suturellus ,but i have only old key to the Polish species......(Galewski ,1971)(old nomenclature!)
:hi:
Regards
Rafał

Allegati:
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Autore:  AdYRuicanescu [ 13/12/2013, 16:36 ]
Oggetto del messaggio:  Re: Rhantus sp. - Dytiscidae
Thank you Rafał. I have to verify too. If it is Rh. suturellus, it would be a new species for Romania.
Autore:  Klaas Reißmann [ 13/12/2013, 17:13 ]
Oggetto del messaggio:  Re: Rhantus sp. - Dytiscidae
Genus Rhantus is everything but good to identify by photo. You Need a lot of small characters one can't see on a photo, even on those good ones you made, Adrian. Maybe colouring got damaged more or less by using the alcohol, but I can't see any black colouring ventral. Rhantus suturellus Shows bigger parts coloured black, what I can't find in These photos. In my mind it is R. latitans, possibly R. exsoletus. But without having a view on the beetle itself I can't tell for sure.

Ciao
Klaas
Autore:  AdYRuicanescu [ 13/12/2013, 21:09 ]
Oggetto del messaggio:  Re: Rhantus sp. - Dytiscidae
Unfortunately I don't have the forelegs claws of the male. The male came with the both protarses broken. The all ventral part is yellow-brown without black spots or parts. It was hard for me to etalate and to take the pictures, the both specimens are extremely fragile, because of the strong alcohol.
Autore:  Klaas Reißmann [ 14/12/2013, 1:30 ]
Oggetto del messaggio:  Re: Rhantus sp. - Dytiscidae
So Rhantus suturellus is no Option. I'm most of all into R. latitans, but can't exclude R. exsoletus.

Ciao
Klaas
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