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  4. » Ischnura elegans (Vander Linden, 1820)

 
Ischnura elegans (Vander Linden, 1820)...

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Ischnura elegans (Vander Linden, 1820) sent on November 02, 2014 (10:22) by Raffaella Coreggioli. 3 comments, 824 views.

, 1/6 f/14.0, ISO 200, tripod.

Nome scientifico: Ischnura elegans (Vander Linden, 1820) Dimensioni: lunghezza: 30-35 mm, apertura alare 30-45 mm. Descrizione della specie: E' una delle libellule più diffuse in Italia e la più grande del suo genere (30-34mm) con dorso dell'addome interamente nero tranne l'ottavo segmento chiaro. I maschi immaturi sono verdi mentre gli adulti presentano porzione centrale dell'addome bronzo-marrone, testa, torace ed estremità addominale celesti. I maschi hanno il torace azzurro con una banda nera e l'addome dorsalmente nero tranne l'8° segmento addominale, si distinguono anche per i cerci divergenti ed il pronoto con esteso lobo mediano. La femmina si presenta con tre forme cromatiche: una simile al maschio (androcroma) e due (ginocrome) con torace rosato da giovani che vira a bruno chiaro grigiastro alla maturità, con (forma infuscans) o senza (forma infuscans-obsoleta) una linea nera mesotoracica. Una colorazione violacea compare transitoriamente in alcune femmine. Le femmine adulte possono avere la stessa colorazione del maschio (femmine andromorfe) ma, generalmente, sono verdi-brunastre con forme giovanili aventi torace rosa-lilla. Gli occhi sono scuri superiormente, il pterostigma, dell'ala anteriore, è bicolore (bianco-nero). Distribuzione e habitat: molto comune in tutta l'Italia continentale. La si può osservare nei pressi di qualsiasi ambiente acquatico. Tollera anche acque salate ma non acide. Periodo di attività: volo esteso da aprile a novembre Fonte web. Insetti - linnea.it



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avatarsenior
sent on November 06, 2014 (9:27) | This comment has been automatically translated (show/hide original)

Very nice one too. Hello Pier

avatarsenior
sent on March 14, 2015 (14:57) | This comment has been automatically translated (show/hide original)

fantastic, congratulations again!

avatarsupporter
sent on March 16, 2015 (10:46) | This comment has been automatically translated (show/hide original)

Thank you for your kind visit and Pierangelo Alago, always a pleasure to read:-)
greetings and good week
Raffaella




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