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Auteur Topic: Aquarius najas?  (gelezen 172 keer)

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DJHiker

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Aquarius najas?
« Gepost op: augustus 04, 2014, 00:54:13 am »

I would like to know which species this is
It concerns this sighting
http://observado.org/waarneming/view/86610028
identification uncertain Aquarius najas observed at 2014-06-30 Spain - Girona
Photos:


Is it an Aquarius najas or another Aquarius sp.?

thanks in advance David Kohl
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David Kohl

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Ton van Haaren

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Re: Aquarius najas?
« Reactie #2 Gepost op: augustus 04, 2014, 09:54:18 am »

This would most likely be a couple  of A. najas. The only other probable species occuring in Spain similar to najas is A. cinereus. Any other species would be out of the question. I never have seen cinereus but this is described as a smaller species (male: 8-10.9 mm; female:10.5-14.4mm) than najas (male:12-14.3 mm; female: 15.3-17.8mm). Also the dorsal side of najas is supposed to be blackish while in cinereus it would be greyish. But, I haven't seen any cinereus so it is hard for me to compare it with. But as najas is the most common species in Europe, and it looks like our najas, this would most probably concern this species. A. cinereus occurs in the mediterranean area (France, Italy, Spain, Northern Afrika) (Aukema & Rieger 1995).
Perhaps Berend has another opinion  ???
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