Autor Thema: Evarcha arcuata? => Evarcha michailovi  (Gelesen 240 mal)

Tamás Nemes

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Evarcha arcuata? => Evarcha michailovi
« am: 2019-09-06 16:16:59 »
Hello All, my first post in this forum  :)
Your help with an ID / approval will be appreciated.

9913.jpg
*9913.jpg (60.65 KB . 652x738 - angeschaut 110 Mal)

Data:
Zebegény, Hungary
pebble riverbank
Aug 28, 2019
4.6 mm

Thanks: Tamas
« Letzte Änderung: 2019-09-07 21:01:50 von Katja Duske »

Simeon Indzhov

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Re: Evarcha arcuata?
« Antwort #1 am: 2019-09-06 16:22:31 »
Hello and welcome,
I am confused by Your spider. It does resemble and Evarcha, but it does not really look like E.arcuata even if habitat fits. It seems to be a subadult male so the colouration is not explained by age. The white brow resembles a bit Evarcha michailovi- and then, it has the white longitudinal line over the cephalothorax like a Sitticus in the rboad sense (habitat would fit for some species, but proportions and abdomenpattern seem to differ). Do You have a frontal view of the spider?
Simeon

Tamás Nemes

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Re: Evarcha arcuata?
« Antwort #2 am: 2019-09-06 16:28:49 »
Thanks for the quick reponse!
I am confused too. Here is a very similar picture of an American relative:
https://www.inaturalist.org/photos/2157416

I took an usb microscope picture of the part where the epigyne should be:
epigyne.jpg
*epigyne.jpg (121.28 KB . 947x999 - angeschaut 114 Mal)

Simeon Indzhov

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Re: Evarcha arcuata?
« Antwort #3 am: 2019-09-06 16:46:45 »
Indeed (although Evarcha proszynskii is more closely related to falcata). Anyway, even there, the ring around the cephalothorax is more clear in the photos at inaturalist (typical for Evarcha), and the median line is way more indistinct and interrupted (although variability is not excluded, it creates a very different impression)

Your spider has no epigyne. It looks immature and from what I see on the dorsal photo, it might be even a young male from what I see from the palps

Tamás Nemes

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Re: Evarcha arcuata?
« Antwort #4 am: 2019-09-06 16:53:12 »
Thanks, so shall we confirm it as an immature E. arcuata?

Simeon Indzhov

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Re: Evarcha arcuata?
« Antwort #5 am: 2019-09-06 16:57:42 »
I am not very convinced, but I am not that good at Salticidae. I would wait for more opinions. You don't have the specimen any more?

Michael Schäfer

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Re: Evarcha arcuata?
« Antwort #6 am: 2019-09-07 20:52:02 »
Evarcha michailovi

Gruß
Micha
Meine neusten Foto-Projekte zeigen Springspinnen aus Fuerteventura und Kreta.

Tamás Nemes

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Re: Evarcha arcuata? => Evarcha michailovi
« Antwort #7 am: 2019-09-09 10:37:02 »
Hello Micha,
Thanks for the ID!

E. michailovi is new to Hungary. I will contact a Hungarian expert with this finding.

Tobias Bauer

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Re: Evarcha arcuata? => Evarcha michailovi
« Antwort #8 am: 2019-09-10 23:34:50 »
Let us know what he said, and please collect, if possible, an adult specimen for deposition at a National History Museum (Maybe in Budapest, there is a well curated arachnid collection).

Tamás Nemes

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Re: Evarcha arcuata? => Evarcha michailovi
« Antwort #9 am: 2019-09-11 09:09:50 »
I contacted dr Csaba Szinetár, one of the authors of the Hungarian checklist. He said it indeed looks like an E. michailovi but species level determination based on a single juvenile specimen is generally not accepted and especially not when it comes to publishing the data.
So all I can do is being on the lookout for adults in the neighborhood.

Tobias Bauer

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Re: Evarcha arcuata? => Evarcha michailovi
« Antwort #10 am: 2019-09-11 09:21:05 »
But still, this is a good starting point. You know where to find the species. You can also try to rear one or two juveniles to adulthood. Normally they (Evarcha species) eat fruit flies and other (small) bugs and can be easily kept in a small plastic container with some substrate and some leaves.

Tobias

Tamás Nemes

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Re: Evarcha arcuata? => Evarcha michailovi
« Antwort #11 am: 2019-09-11 10:22:34 »
I regret I did not keep and try to rear that one. But I had no idea when I took the picture and then I always let my subjects free. Now I can only hope I will ever find a new one. Thanks for the tips anyway!
Tamas