[Syrphidae] Re: Sex identification based on abdomen coloration

Steven Falk steven at sfalk.wanadoo.co.uk
Wed Feb 10 11:22:07 GMT 2016

Hi Malin
Females of both these species are generally darker,but there is considerable
variation in both sexes and all-dark specimens exist in both sexes. But the
shape and width of frons is most reliable, and in arbustorum, even a pale
female looks very different to a plane male i.e. the patterns are different.
But just using 'brightness' alone is not relaibale. For more info, see my
Flickr feature:
You also need to account for the other Ersitalis species that fly alongside
tenax and arbustorum.
Good luck,
Steven Falk BSc ARCS FRES
www.stevenfalk.co.uk <http://www.stevenfalk.co.uk/> 
mobile: 0781 555 7263
Twitter: @StevenFalk1
Help Our Bees: http://www.stevenfalk.co.uk/help-our-bees
Flickr Image library at:
LinkedIn profile: https://www.linkedin.com/in/steven-falk-aa8ba817


From: syrphidae-bounces at lists.nottingham.ac.uk
[mailto:syrphidae-bounces at lists.nottingham.ac.uk] On Behalf Of Malin
Sent: 10 February 2016 08:16
To: syrphidae at lists.nottingham.ac.uk
Subject: [Syrphidae] Sex identification based on abdomen coloration


During this years field season I have started to consider whether the
coloration of the abdomen can help in sex identification, particularity of
Eristalis tenax and Eristalis arbustorum. My feeling is that the most
brightly coloured individuals appear to be male, whereas the individuals
with darker colours could be either male or female. Have anyone noted
something similar or do you have another way to quickly determine sex in the
field (except for the difference in eye morphology, which even though useful
can be a bit tricky in some field situations)?

Best Regards
Malin Thyselius

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