Forum Entomologi Italiani

Di questo maschio penso che la femmina sia questa viewtopic.php?f=345&t=93435&hilit=Pselaphinae , preso nello stesso luogo e contesto (alla luce); uniformemente fulvo, con solchi tra le fossette pronotali e processo ventrale ad ancora. Mi pongo gli stessi quesiti espressi nel link: se è una Ribaxis è una forma unicolore di longicornis? Grazie e buona fine d'anno!!
Che peggio del 2020 non può andare!

Rybaxis laminata, male

In the Catalogue of Palearctic Coleoptera, volume 2, Rybaxis laminata is considered a synonym of longicornis. Is it currently considered a valid taxon?

Thank a lot Adam. According with what Adam says here viewtopic.php?f=345&t=30906 laminata male bears a ventral process like in photo above, I suppose absent in longicornis male (not obviously but conceivable confirmed by Adam in the linked topic) not a negligible detail if so. That shows why I haven't found pictures of that process in the several pictures of longicornis males in web pages. Here https://www.naturbasen.dk/art/10476/rybaxis-laminata a picture of laminata male wich shows a lateral view of the process and male aedagal structure.

According to Besuchet (1989) R. laminata is a synonym of R. longicornis. However, a more recent publication (Hansen et al.,
1999) considers them to be two separate species; this is based on male genitalia. In the present study all the specimens were determined using Besuchet (1974, 1989), and therefore treated as R. longicornis.

HANSEN M., PEDERSEN J. & PRITZL G. 1999: Records of beetles from Denmark, 1998 (Coleoptera). Entomol. Medd. 67:71–102 [in Danish, English abstract].

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Research Fields
Taxonomy, ecology, biomonitoring , faunistic of Staphylinidae

In my opinion, there are two separate and easily distinguishable species. I really do not understand why the completely different penises combined with excessive external characteristics are not taken into account, but.... as I said, it only is my conviction.

Thanks' Jan for pictures.
Please someone of you can confirm only laminata bears the ventral process in males and by this, the identity of it is possible without dissection or must I to dissect? Happy new year to all!

The ventral lamina is only in R. laminata males. Dissection is not necessary.

Very well. Thank a lot.