Ichthyoclaudius Fittkau



Small, up to 7 mm long.


Antenna with four segments, basal segment about as long as or slightly longer than flagellum, second antennal segment slightly longer than or subequal to third. Basal antennal segment 1.5-2 times as long as basally wide, with ring organ situated in apical third. Lauterborn organs not observed, style well developed. Blade slightly shorter than flagellum, accessory blade about half as long.


SI pectinate to plumose. Other S setae simple. Labral lamella large, bluntly triangular with about 50 teeth. Chaetae reduced to two pegs. Pecten epipharyngis consisting of three pointed teeth. About six chaetulae laterales with the median apparently serrated, chaetulae basales weak. Premandible with three distinct dark inner teeth and 3-5 broadly lamellate, pale and fused outer teeth (not visible in all views), without or with vestigial brush.


Mandible with long, bent apical tooth longer than combined width of 3-4 inner teeth. Seta subdentalis well developed. Seta interna absent.


Mentum with 16-20 equal-sized small median teeth nearly in a straight line and five pairs of slightly larger lateral teeth. Ventromental plates long and narrow. Setae submenti situated above base of outer lateral tooth of mentum.


Maxilla relatively large, pecten galearis apparently absent, maxillary palp well developed. Anterior lacinial chaeta apparently with apical teeth.


Anterior and posterior parapods well developed; claws of anterior parapods pale to brown, longer claws smooth or with a few very small inner teeth; posterior parapods with 12-15 black claws without teeth. Procercus absent or very low, 3-4 short anal setae. Supraanal seta minute. Anal tubules very short. Body setae very short.


Ecological Notes

The larva of Ichthyocladius differs from other chironomids by having about 16-20 dark, equal-sized median and five pairs of slightly larger lateral teeth in the mentum and no mandibular seta interna.

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