Forum Entomologi Italiani

A me pare una femmina di tale specie. Confermate? mm 7,5. Foto fatte col telefonino
Grazie.

premesso che a quanto mi ha segnalato fausto pesarini, recentemente è stata confermata la separazione generica, anzi la notevole distanza, fra Nematus e Pteronidea (meglio tardi che mai ), forse l'unico aspetto sensato di uno studio per il resto alquanto sconclusionato

ho provato a darci un'occhiata, ma i caratteri che non si vedono sono troppi in più nel faune de france, riguardo a P. pavida, tabella dicotomica ("tête jaune") e descrizione ("tête noire") si contraddicono quindi devo cercare qualcos'altro

ad ogni modo, ho raccolto recentemente alcuni exx. di qualcosa che sembra molto simile, intanto provo ad arrivarci da quelli

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maurizio

Ho notato nella chiave l'incongruenza ma è un palese errore giacchè nella descrizione si dice che la specie ha testa nera e parti boccali chiare; per questo ho ipotizzato la specie. Il resto dei caratteri infatti combaciano tutti.

Berland (french key) has often incomplely translations of Enslin’s descriptions.
According to this latter Author, the colour of the head of pavidus can vary from yellow to almost entirely black.
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if you still have the insect, use viewtopic.php?f=375&t=80350&hilit=+nematinae , to identify genus and sub-genus

Thanks. Running along the key I stop to point 8 first option -> Amauronematus?
I resume others main characters of this female:
- vein Sc placed before M;
- FW anal cell petiolate;
- clypeus margin deeply excised;
- antenna clearly tapered toward apex;
- frontal crest non angularly produced, from above anteriorly flattened and with one longitudinal central dimple.

YES ! Genus (or sub-Genus according to some Authors) Amauronematus
See sub-Genus & species with viewtopic.php?f=375&t=80484&hilit=+amauronematus

Sorry but I am enable to continue along keys with confidence: my final result bring to Brachycoluma viduatus (?) but it's so different in body. So I prefere to show some other pictures taken with stereo microscope for more opinions. Thank's anyway to all.

It seems to me that the sawsheat has parallel sides, not triangular ?

It is one of the difficulty also for me: at the base it is largely triangular (equilateral about, as in photo) but I don't know in wich point to evaluate it.

I’m not sure what you’re seeing triangular belongs to the Sawsheat.
So have you a lateral view of Sawsheat ?

Like this?

Saluti,

- According to Muche 1975 (Entomologische Abhandlungen - band 40 supplement II - p.9),

the Pterostigma of viduatus ♀ has a dark border, so your capture is not viduatus

- According to Lindqvist 1945 (Notulae entomologicae - XXV - p.103),

the hairs of the Sawsheat of viduatus are long, so your capture is not viduatus

So your capture is erectus (Lindqvist 1945)

Amauronematus (Brachycoluma) = Nematus (Amauronematus) = Euura

Ciao,
D & JP Balmer

What did you include in the 7.5 mm length of your insect ?
Thanks

Thanks a lot. Total body lenght (from front to end of abdomen seen from upper view) is correctly 7.7 mm. If you confirm Amauronematus (Brachycoluma) erectus Lindqvist, 1945 this species is not present in Italy as Faunaeur says, only in France, Sweden and Finland. Not present also in italian Checklist.

- According to EcatSym, erectus is present in Italy.
- But it is not erectus, because this species has a maximum length of 5.5 mm !
- My key (see viewtopic.php?f=375&t=80484&hilit=+amauronematus) contains only French & Italian species, I will have to search for other European species (without guarantee of success ...)