Callibaetis

Cruz, Paulo Vilela, Salles, Frederico Falcão & Hamada, Neusa, 2017, Four new species of Callibaetis Eaton (Ephemeroptera: Baetidae), nymphal description of Callibaetis (Abaetetuba) fasciatus (Pictet) and keys for South American species of Callibaetis, Zootaxa 4250 (3), pp. 229-261 : 258

Key to identify described male imagoes of Callibaetis species from South America*

1. Forewing with single marginal intercalary vein.............................................................. 2

1’. Forewing with paired marginal intercalary veins.............................................................4

2. Forceps segment III with apex rounded ( Fig. 10 G in Cruz et al. 2017), brownish specimens (before fixation) ( Fig. 10 A in Cruz et al. 2017)............................................................................... C. (Ab.) pollens

2’. Forceps segment III with apex truncated ( Fig. 11 C in Cruz et al. 2014), green specimens (before fixation) ( Fig. 11 D in Cruz et al. 2014)............................................................................................3

3. Turbinate portion of compound eyes with stalk height 0.4–0.5× dorsal portion height ( Fig. 11 B in Cruz et al. 2014), costal pro- cess of hind wing rounded ( Fig. 11 F in Cruz et al. 2014)......................................... C. (Ca.) gonzalezi

3’. Turbinate portion of compound eyes with stalk height 0.85–0.90× dorsal portion height (Fig. 26B in Cruz et al. 2014), costal process of hind wing quadrangular (Fig. 26E in Cruz et al. 2014)................................... C. (Ca.) radiatus

4. Dorsal surface of turbinate portion of compound eyes rounded ( Fig. 10 A in Cruz et al. 2014).........................5

4’. Dorsal surface of turbinate portion of compound eyes oval ( Figs 5 A, 13A)........................................ 6

5. Turbinate portion of compound eyes with constriction on apical third ( Fig. 10 B in Cruz et al. 2014)........ C. (Cu.) gelidus

5’. Turbinate portion of compound eyes with constriction on basal third ( Fig. 21 B in Cruz et al. 2014)...... C. (Cu.) nigracyclus

6. Abdominal terga III, V and VII with oblique red mark ( Figs 7 A and 22E in Cruz et al. 2017)..........................7

6’. Abdominal terga III, V and VII without oblique red mark ( Fig. 2 A in Cruz et al. 2017)............................. 11

7. Abdominal sterna with one medial mark on anterior margin ( Fig. 11 G in Cruz et al. 2017)............... C. (Ca.) willineri

7’. Abdominal sterna without one medial mark on anterior margin ( Fig. 7 B in Cruz et al. 2017)..........................8

8. Turbinate portion of compound eyes (in lateral view) with anterior and posterior margins subparallel ( Fig. 2 in Cruz et al. 2009 and Fig. 17 B in Cruz et al. 2014).........................................................................9

8’. Turbinate portion of compound eyes (in lateral view) with anterior and posterior margins divergent ( Fig. 13 B, Fig. 1 B in Cruz et al. 2014)......................................................................................... 10

9. Turbinate portion of compound eyes with stalk height 1.9× dorsal portion height ( Fig. 17 B in Cruz et al. 2014), marginal inter- calary veins on hind wing present ( Fig. 17 E in Cruz et al. 2014).................................... C. (Ca.) jocosus

9’. Turbinate portion of compound eyes with stalk height 2.6× dorsal portion height, marginal intercalary veins on hind wing absent ( Figs 4 a and 4b in Cruz et al. 2009)...................................................... C. (Ca.) zonalis

10. Turbinate portion of compound eyes with stalk height 1.1× dorsal portion height ( Fig. 1 B in Cruz et al. 2014)................................................................................................. C. (Cu.) calloventer

10’. Turbinate portion of compound eyes with stalk height 1.9× dorsal portion height...................... C. (Ca.) guttatus

11. Forewing without pigmentation (Fig. 29 in Cruz et al. 2009 and Fig. 13 D in Cruz et al. 2014)........................12

11’. Forewing with pigmentation ( Fig. 2 in Nieto & Cruz 2013 and Fig. 27D in Cruz et al. 2014).........................14

12. Abdominal sterna with two large marks on anterior margin ( Fig. 2 B in Cruz et al. 2017)................ C. (Ab.) capixaba

12’. Abdominal sterna without two large marks on anterior margin ( Fig. 13 C)........................................13

13. Abdominal sterna and terga with transverse small brown mark on posterior margin, abdomen without spots ( Figs 13 F and 13I in Cruz et al. 2014)......................................................................... C. (Ai.) itannae

13’. Abdominal sterna and terga without small brown transverse mark on posterior margin, abdomen covered by spots ( Fig. 13 A)................................................................................. C. (Ca.) molinerii sp. nov.

14. Forewing with apical third completely pigmented, basal 2/3 hyaline ( Fig. 2 in Nieto & Cruz 2013)...... C. (Ab.) dominguezi

14’. Forewing without apical third completely pigmented, basal 2/3 with some pigmentation.............................15

15. Forewing pigmentation forming bands ( Figs 5 D and 27D in Cruz et al. 2014).....................................16

15’. Forewing pigmentation not forming bands ( Figs 17 D and 6B in Cruz et al. 2014)..................................18

16. Apical band parallel to posterior margin of forewing (Fig. 27D in Cruz et al. 2014).................... C. (Ab.) sellacki

16’. Apical band transverse to posterior margin of forewing ( Fig. 9 C in Cruz et al. 2014)...............................17

17. First segment of forceps cylindrical ( Fig. 5 C in Cruz et al. 2014)................................... C. (Ca.) cruentus

17’. First segment of forceps with base wider than apex ( Fig. 9 F in Cruz et al. 2014)....................... C. (Ab.) fasciatus

18. Pair of medioanterior and medioposterior sigilla on abdominal terga strong pigmented ( Fig. 11 A). C. (Cu.) imperator sp. nov.

18’. Pair of medioanterior and medioposterior sigilla on abdominal terga without pigment ( Fig. 6 E in Cruz et al. 2017)....................................................................................................... C. jaffueli