Key to the larvae of the Corynoneura group

The larva of Physoneura is unknown; the larva Notocladius is not keyed.

1. Small size, usually less than 4 mm; procercus and posterior parapods distinct; antennal segments evenly sclerotized, with normal, short terminal segment; antennae at least as long as 1/2 head length, or if shorter then head capsule elongated, at least 1.5 times as long as wide, except in Ichthyocladius. Corynoneura group ...................................... 2

- Character combinations different.................................................................................................................... not keyed

2. Mentum with 16–20 dark, equal sized median and 5 pairs of slightly larger, lateral teeth; mandibular seta interna absent; larvae phoretic on catfishes ............................................................................................ Ichthyocladius Fittkau

- Mentum not as above; mandibular seta interna usually present ................................................................................... 3

3. Antennae with 4 segments, subequal or longer than head ........................................................ Corynoneura, Winnertz

- Antennae with 5 segments, shorter than head.............................................................................................................. 4

4. Antennal blade slightly longer than flagellum; antenna about 1/4 of head length ......................................................... ........................................................................................................................... Tempisquitoneura Epler et de la Rosa

- Antennal blade much shorter than flagellum; antenna longer than 1/4 of head length ................................................ 5

5. Antenna about 1/3 of head length; 3rd antennal segment short; Lauterborn organs well developed, generally reach- ing end of 3rd segment; abdominal setae stout, dark and long.................................... Onconeura Andersen et Saether

- Antenna at least 1/2 of head length; 3rd antennal segment usually long; Lauterborn organs usually reduced; abdomi- nal setae usually not as above ....................................................................................................................................... 6

6. Sub-basal seta of posterior parapod apically split (Fig. 4 G) ....................................................... Ubatubaneura n. gen.

- Sub-basal seta of posterior parapod simple ............................................................................. Thienemanniella Kieffer