nightfly's picture

Edit- Sialis larvae not caddis.

Observed: 5th March 2013 By: nightflynightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebrates
Species interactions

No interactions present.


nightfly's picture

You are absolutely right

You are absolutely right John, that explains the lack of caddis case remnants in the stomach contents. Thanks for this, I hadn't considered anything other than caddis but there are definitely alderflies at the site also and these are the larvae as you point out. Well spotted!


nightfly's picture

Hi John,I havent had the

Hi John,

I havent had the luxury of viewing the FBA key, is it online by any chance?

I trust you are correct, you seem to know what your'e on about!

Ive just got hold of Martin Wallaces key to caddis larvae and it refers to the FBA keys for caddis, are the sialis included in a seperate FBA key or are they covered with the caddis?

Thanks for the ID.

I just noticed the good similarity between the head markings above and those in the excellent pics by mbf45 in the other larva observation in the carousel.


John Bratton's picture

According to an old paper,

According to an old paper, the head of Sialis nigripes is yellowish with virtually no pattern and the suture doesn't have a gap in the middle, so yours is definitely lutaria.

The FBA key you need is to Megaloptera and Neuroptera, but it has only two Sialis. The paper with three was in Freshwater Biology about 1980 I think. I can check if you like, or you could try Google Scholar.


John Bratton's picture

Elliott, O'Connor & O'Connor,

Elliott, O'Connor & O'Connor, 1979. A key to the larvae of Sialidae occurring in the British Isles. Freshwater Biology, 9: 511-514.

nightfly's picture

Thanks for this John. Plenty

Thanks for this John. Plenty to study.


AquaBugSpotter's picture

Indeed Sialis it is.

The mandibles give it away as being quite distinctly megaloptera &100% definitely not a caddis this time. You'd usually be also eyeing up the lateral gills, dorsal marking and lack of anal claws too but the pics don't highlight these.

&lutaria in particular given the head markings - particularly the raised darkened orbital ridges. (behind the eyes running to the back of the head)

Time flies like an arrow, but fruit flies like a banana.
5 Years pro aquatic ecologist.
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