Apobaetis

Cruz, Paulo Vilela & De-Souza, Marcia Regina, 2014, Two new species of Apobaetis Day, 1955 (Ephemeroptera: Baetidae) from Brazil, Zootaxa 3866 (4), pp. 591-599 : 598

Key to known nymphs of Apobaetis (Adapted from Nieto 2006)

1 Tarsal claws longer than tarsi........................................................................... 2

1’ Tarsal claws shorter than tarsi............................................................................ 5

2 (1) Segment III of labial palp subrectangular ( Figs. 9 , 21 )........................................................ 3

2’ Segment III of labial palp subtriangular (see Cruz et al. 2011, Fig. 16 )........................................... 4

3 (2) Segment II of maxillary palp without constriction ( Fig. 7 ); segment II of labial palp with straight distomedial projection ( Fig. 9 ); paraproct with four marginal spines ( Fig. 12 )............................................ A. kethepiali sp. nov.

3’ Segment II of maxillary palp with constriction ( Fig. 19 ); segment II of labial palp with pointed distomedial projection ( Fig. 21 ); paraproct with one pointed marginal spine ( Fig. 23 )......................................... A. pucupi sp. nov.

4 (2’) Segment II of labial palp with strongly rounded distomedial projection (see McCafferty 2000, Fig. 5 ); distal margin of labrum with simple setae (see McCafferty 2000, Fig. 1 ); paraproct with seven marginal spines (see McCafferty 2000, Fig. 7 ).................................................................................................... A. lakota

4’ Segment II of labial palp with an apically pointed distomedial projection (see Cruz et al. 2011, Fig. 16 ); distal margin of labrum with spatulated setae (see Cruz et al. 2011, Fig. 11 ); paraproct with 13–15 marginal spines (see Cruz et al. 2011, Fig. 24 )........................................................................................ A. hamadae

5 (1’) Segment III of labial palp subrectangular (see Lugo-Ortiz & McCafferty 1997, Fig. 6 ).............................. 6

5’ Segment III of labial palp subtriangular (see Nieto 2006, Fig. 12 )............................................... 8

6 (5) Labrum, anterior margin with blunt setae near midline (see Nieto 2006, Fig. 4 b).............................. A. fiuzai

6’ Labrum, anterior margin without blunt setae near midline (see Nieto 2006, Fig. 6 b)................................. 7

7 (6’) Segment II of maxillary palp with apical constriction (see Day 1955, Fig. 5 )............................... A. etowah

7’ Segment II of maxillary palp without apical constriction (see Lugo-Ortiz &McCafferty 1997, Fig. 5 )........... A. signifer

8 (5’) Maxillary palp long, at least 1.5× length of galea-lacinia (see Nieto 2006, Fig. 35); dorsal margin of femora with blunt setae (see Nieto 2006, Fig. 38).......................................................................... A. niger

8’ Maxillary palp shorter, subequal to galea-lacinia (see Nieto 2006, Fig. 23 ); dorsal margin of femora without blunt setae (see Nieto 2006, Fig. 26 ).................................................................................. 9

9 (8’) Labrum with a deep medial emargination (see Nieto 2006, Fig. 6 a); segment II of labial palp with distomedial projection api- cally rounded (see Nieto 2006, Fig. 12 )............................................................ A. insolitus

9’ Labrum with a shallow medial emargination (see Nieto 2006, Fig. 19 ); segment II of labial palp with distomedial projection apically pointed (see Nieto 2006, Fig. 25 )........................................................ A. kallawaya

Figures

FIGURES 3 – 9. Apobaetis kethepiali sp. nov. (3) antenna; (4) labrum (left d. v., right v. v.); (5) right mandible; (6) left mandible; (7) maxilla; (8) hypopharynx (left d. v., right v. v.); (9) labium (palp were separated to facilitate visualization of structures).

FIGURES 15 – 21. Apobaetis pucupi sp. nov. (15) antennae; (16) labrum (left d. v., right v. v.); (17) right mandible; (18) left mandible; (19) maxillae; (20) hypopharynx (left d. v., right v. v.); (21) labium (palp were separated to facilitate visualization of structures).

FIGURES 10 – 14. Apobaetis kethepiali sp. nov. (10 a) foreleg; (10 b) detail of dorsal margin setae of forefemur; (11) posterior margin of abdominal terga IV; (12) paraproct; (13) detail of cerci; (14) detail of terminal filament.

FIGURES 22 – 26. Apobaetis pucupi sp. nov. (22) foreleg; (23) posterior margin of abdominal terga IV; (24) paraproct; (25) detail of cerci; (26) detail of terminal filament.

FIGURES 1 – 2. Dorsal habitus of nymphs. (1) Apobaetis kethepiali sp. nov.; (2) Apobaetis pucupi sp. nov.