Of the many species of chironomid, (over eight hundred known), the vast majority are inoffensive.
The legs are relatively stouter than in the other chironomid.
These appear to be the work of chironomid larv, of which there are several specimens loose in the bottle containing the sponges.
Bloodworms (chironomid larvae) were the largest food item, forming 72.8 per cent of the animal food.
To this group belong numerous chironomid genera, none of which are known to be noxious to man.
They are chironomid in which the thorax is not prolonged over the head.