nightfly's picture

Ephemeridae/ Ephemeroptera?

Observed: 25th September 2010 By: nightflynightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebrates
25 Sep 2010, na Trosk (60)
14 August 10 (8)
Description:
Identifications
Species interactions

No interactions present.

Comments

chrisbrooks's picture

ID Question

Hi Cathal, I've been pondering over this and I think it is newly emerged and lacks a bit of colour. Would you agree it has 2 tails or can I see 2 stuck together (I think it's 2) ? Regards Chris

nightfly's picture

Chris Im quite confident this

Chris Im quite confident this a 2 tailed insect, I will try to find another pic to back that up.

Thanks.

Cathal.

chrisbrooks's picture

ID Comment

Cathal, two tails and no or very small insignificant hind wings I would say it was a Baetidae but with little confidence, there are just so many species. What do you think ?

inopinatus's picture

Baetidae

Ephemeridae, the true mayflies, have 3 tails, so this is not that. It is in the order of Ephemeroptera (also often known as mayflies, or up-wing flies, dayflies, etc). I would agree that this is probably from the Baetidae family due to the lack of visible hind wings, however it is hard to tell. Can you give a rough idea of the size?

nightfly's picture

Thanks inopinatus, Smaller

Thanks inopinatus,

Smaller than the early spring 'large dark olive' which I think is or was once called Baetis rhodani? Just checked, yes B. rhodani.

A good bit smaller. I am going to have to estimate. Body length from tip of abdomen to mouthparts, approx 9mm. I am guessing, sorry I cant be more presice, I should search for other photos as Ive taken many of various flies at this lake for several years.

Sorry I didnt get back to you yesterday Chris,

What about Cloeon dipterum, the pond olive?

Cloeon simile?

Cathal.

inopinatus's picture

Cloeon

I think that Cloeon is a good bet, particularly with the apparent absence of hind wings. Difficult to tell the two species apart though and both can be found in lakes.

nightfly's picture

Sticking in another shot of a

Sticking in another shot of a dead or dying insect which is very similar, it doesnt have to stay in if not appropriate as it isnt the same insect, but it was found at the same water a month earlier in the year.

2 tails, probably baetidae?

Cathal.