Corynoneura Winnertz

Fu, Yue & Saether, Ole A., 2012, 3536, Zootaxa 3536, pp. 1-61 : 53

Key to Nearctic larvae of Corynoneura Winnertz (based on Bolton 2007 and Epler 2001)

1. Head capsule integument pustulate/granulate; mentum with 2 median teeth; known only from southern Florida .................................................................................................... C. sp. F (Epler)

– Head capsule integument sculptured with fine ridges, or smooth, unsculptured..................................... 2

2. Head capsule integument sculptured with fine ridges that are usually in a reticulate pattern (sculpturing usually strongest dorsally, but may be faint and difficult to see)...................................... 3

– Head capsule integument smooth, unsculptured............................................................. 7

3. Mentum with 2 median teeth; antenna slightly shorter than head capsule (AL/HL = 0.8–0.9)........... C. acuminata sp. n.

– Mentum with 3 median teeth; antenna longer than head capsule................................................. 4

4. Antenna about twice as long as head capsule (AL/HL = 1.8–2.2); head capsule weakly sculptured; mentum with 5 lateral teeth; premandible not noticeably toothed at 400X; subbasal seta of posterior parapod with a star-shaped sclerotized ring around the attachment area; lotic and lentic habitats....................................................... C. macula sp. n.

– Antenna shorter (AL/HL = 1.1–1.7); other characters variable.................................................. 5

5. Mentum with first lateral tooth reduced and partially fused with median teeth or absent, in which case there are only 4 lateral teeth; premandible not noticeably toothed at 400X (fine teeth visible at 1000X); this is the most commonly collected species in different-sized lotic habitats, from rheocrenes to large rivers...................................... C. lobata Edwards

– Mentum with first lateral tooth not reduced or partially fused, 5 lateral teeth; premandible noticeably toothed at 400X; lentic habitats............................................................................................. 6

6. Head capsule weakly sculptured; antenna only slightly longer than head capsule (AL/HL= 1.1–1.2); subbasal seta of posterior parapod with only short lateral spinules arising near base...................................... C. edwardsi Brundin

– Head capsule strongly sculptured; antenna at least 1.5 times as long as head capsule (AL/HL = 1.5–1.8); subbasal seta of posterior parapod often with one or two spinules arising from oneside near base...................... C. scutellata Winnertz

7. Mentum with 2 median teeth............................................................................ 8

– Mentum with 3 median teeth............................................................................. 9

8. Antenna only? with segment 3 dark; subbasal seta of posterior parapod with lateral spinules originating from about half or more of the length of main shaft; inhabits small streams to large rivers............................ C. floridaensis sp. n.

– Antenna with segments 2 and 3 dark; subbasal seta of posterior parapod with lateral spinules. originating from about third of the length of the main shaft................................................................ C. sp. 12 (Bolton)

9. Antenna very long (AL/HL = 2.2–2.5, A1L/HL? =1.1–1.3); premandible noticeably toothed at 400X; mentum sometimes with a small 6th lateral tooth; lentic habitats.................................... C. doriceni Makarchenko et Makarchenko

– Antenna not unusually long (AL/HL = 0.8–1.8); premandible not noticeably toothed at 400X (fine teeth may be visible at 1000X); mentum with only 5 lateral teeth................................................................. 10

10. Mentum with 1st lateral tooth reduced, not as wide as 2nd lateral tooth.......................................... 11

– Mentum with 1st lateral tooth not reduced................................................................. 14

11. Antenna slightly shorter than length of head capsule (AL/HL = 0.8–0.9); posterior parapod subbasal seta with long lateral spinules that primarily arise from one side; inhabits small to medium sized streams................... C. caudicula sp. n.

– Antenna longer than head capsule (AL/HL = 1.1–1.8)....................................................... 12

12. Antenna AL/HL = 1.1–1.5; posterior parapod subbasal seta with lateral spinules usually arising primarily on one side; inhabits rheocrenes.............................................................................. C. ascensa sp. n.

– Antenna AL/HL = 1.3–1.8; posterior parapod subbasal seta with lateral spinules usually arising more equally on both sides; inhabits larger streams or lentic habitats................................................................... 13

13. Antenna AL/HL = 1.3; lentic habitats......................................................... C. sp. 6 (Bolton)

– Antenna AL/HL = 1.6–1.8; inhabits small to medium-sized streams................................. C. sp. “ lacustris ”

14. Antenna AL/HL = 1.1; inhabits shallow vernal woodland pools................................... C. disinflata sp. n.

– Antenna AL/HL = 1.6; inhabits rheocrenes.................................................... C. sp. 10 (Bolton)