HELENE on Oct 10, 2007October 10th, 2007, 1:37 am EDT
I've found some sedge larva (?) in a small stream in Wales, living in small tiny, tiny pebbles, like a tunnel! I do recognize the head and legs and would love to know a little bit more about them! Some also had sticks glued to the pebbles, looking like grasshoppers that's drowned! I shall look forward to hearing from you on my e-mail - firstname.lastname@example.org - Thanks Helene Mills
Taxon on Oct 10, 2007October 10th, 2007, 4:09 am EDT
Caddisfly larvae are generally classified as net spinning, free living, or case building. The netspinners build a retreat incorporating a silken net to capture food, similar to a spider web, only underwater. The freeliving build no shelter. The casebuilders build either a portable or fixed case for their protection.
A species which builds cases generally constructs them so similarly, that a case can often be identified to genus level simply by virtue of its shape and the materials used in its construction.
PaulRoberts on Aug 9, 2012August 9th, 2012, 10:58 am EDT
Hydro's are quite different looking. They have notable gills along the underside of the abdomen. Many Rhyaco's have that brilliant blue-green coloration. Hydro's are normally duller in color, usually tan to olive, although some can be a fairly bright green.
That's the trouble with common names. In this case "green rock worm" is a good description, but unfortunately for many critters.