jeremyr's picture

Hoverfly

Observed: 20th October 2012 By: jeremyrjeremyr’s reputation in Invertebratesjeremyr’s reputation in Invertebratesjeremyr’s reputation in Invertebratesjeremyr’s reputation in Invertebratesjeremyr’s reputation in Invertebrates
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Description:

I assumed a Melanostoma male, but the yellow markings seem smaller and less square than expected, and is that a flattened front tarsus in image 1, suggesting Platycheirus? and I can't really read r2+3

Identifications
Species interactions

No interactions present.

Comments

ophrys's picture

Platycheirus

The two tufts of tangled, black hairs at the base of the front femora are found in P. albimanus and P. scutatus. The front tibiae and tarsi are not really clear, unfortunately, to distinguish the two. scutatus tends to have yellow spots, albimanus bronze, but I find that difficult to judge sometimes. If Roger comes along, he will do it for you, I am sure.

Ian
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Roger Morris's picture

Probably P. scutatus

My initial reaction would be P. scutatus (agg) - but all of a sudden I am having second thoughts!

The front metatarsi don't look to be greatly flange-shaped but are enlarged. It is difficult to be sure about the relative size of the second front tarsal segment. The abdominal markings are I think too clear to be P. albimanus but I would not like to be any more definitive as reflections can be deceptive. That said, the majority of the tarsi are obviously pale. However, resolution is not ideal so it is best just to say Platycheirus sp.

P. scutatus has been split and even males are tricky - I would not be trying to do them from photos and still struggle with specimens under the microscope.