Forum Entomologi Italiani

Perdonatemi se posto spesso le stesse specie, ma col vostro aiuto vorrei imparare a districarmi con queste interessanti specie.
Questa qua è una femmina immatura ti I. genei?

Ps come discernere i generi Ischnura e Coenagrion?

Fiume Torto, C. Mendolazza, Caccamo (PA). 21 VI 2010

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stat rosa pristina nomine, nomina nuda tenemus

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stat rosa pristina nomine, nomina nuda tenemus

Is a female of Ischnura genei (Rambur, 1842).
The only Coenagrion that is somehow like an Ischnura is a particular form of female from Coenagrion pulchellum (Vander Linden, 1825). To see that form please check the photos from here.
Now
Coenagrion vs. Ischnura
males:
pterostigma in one color/pterostigma two-toned color
black inter pleural stripe and usualy very well developed/black inter pleural stripe visible or not
in general abdomen is blue with black markings/abdomen black only segment 8 and/or 9 with blue
female
no vulvar spine/vulvar spine is present

but in general Coenagrion is very different compared with Ischnura in the field.

check for fotos in internet or on my website... Coenagrionidae family.

hope this helps you,
cosmln

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Cosmin-Ovidiu Manci
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cosmln's place - my blog
just insects
Dragonflies of Romania

Grazie Cosmin, utili informazioni, ho ancora tanto da studiare

Ps non lo conoscevo, splendido il tuo sito

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stat rosa pristina nomine, nomina nuda tenemus