dejayM's picture

Waterboatman

Observed: 26th September 2013 By: dejayM
Biological Recording In ScotlandHighland Biological Recording GroupOrkney Biodiversity Records Centre
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patina
under
found
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Description:

I walked across the moor carrying the fine-flour sieve on a stick
I was looking for Eurycercus glacialis (as you do). I caught dozens of these little rowers.
Later, through the scope and investigating the sediment, I found the transparent carapace of a youngster. I was much impressed by the oars which are, in fact, hairy 'claws'.
Did you know? "The boatman's mating call, generated by rubbing the penis against the abdomen, is the loudest sound, relative to body size, in the animal kingdom" Wiki.
Hear it here http://soundcloud.com/marco-pesente/corixa-punctata-sound

Identifications
Species interactions

No interactions present.

Comments

John Bratton's picture

Did you rule out Corixa

Did you rule out Corixa iberica? Those middle femora look quite straight, though they are somewhat out of focus in the photo of the underside, so hard to tell.

As for glacialis, stick at it.

John

dejayM's picture

iberica etc..

No, I didn't, specifically. But I'll look through my photos and repeat the exercise (as one should).
I have the Savage Key but it is proving a little complex for my mind (as yet).
Looking through the other close-ups, I suspect BOTH may be present.
A/ is that reasonable (for my location)?
...........
I feel the hunt for glacialis may stall, as every lochan I encounter is heavily acidic from the peat. The highish lochs in Shetland were quite different. But I am now on the lookout for topo- if not geo-differences here.
B/ is acidity a factor when searching?
Thanks for your recent mails.
ð

John Bratton's picture

Acc. to the NBN, C. iberica

Acc. to the NBN, C. iberica has been found on Orkney, whereas punctata hasn't, which I didn't realise when I made the comment.

John

jeremyr's picture

Corixa

interesting images and sound-recording

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