Akalyptoischion

Hartley, Christopher S., Andrews, Fred G. & Mchugh, Joseph V., 2007, A Taxonomic Revision Of The Genus Akalyptoischion Andrews (Coleoptera: Latridiidae), The Coleopterists Bulletin (mo 6) 61, pp. 1-50 : 10-12

Key to Species of Akalyptoischion

1. Antenna with a 2-segmented club.......................................... 2

- Antenna with a 3-segmented club.......................................... 6

2(1). Lateral pronotal margin and dorsal surfaces of head and pronotum glabrous; elytra subglabrous, with very short decumbent setae on interspaces 1, 3, 5 and lateral margin only..................................................... A. leptosoma Hartley, Andrews & McHugh new species

- Lateral pronotal margin and dorsal surfaces of head and pronotum setose; all elytral interspaces setose, setae short to very long..................... 3

3(2). Elytron ( Fig. 14 ) and lateral pronotal margin ( Fig. 47 ) with only short decumbent setae; setae all the same length and appressed to body................................................................ A. chandleri Andrews

- Elytron and lateral pronotal margin ( Fig. 45 ) with much longer setae that are conspicuous and not appressed to body; elytral setae on raised interspaces longer than setae on non-raised interspaces.................. 4

4(3). Elytra without erect setae........................... A. sleeperi Andrews

- Elytra with rows of long erect setae on interspaces 1, 3, 5 and lateral margin...................................................................... 5

5(4). Head ( Fig. 31 ) broadly trapezoidal, width subequal to length; eyes small, not prominent................................ A. giulianii Andrews

- Head ( Fig. 34 ) narrow, broadening posteriorly; eyes large, prominent............ A. heterotrichos Hartley, Andrews & McHugh new species

6(1). Dorsal surface of head, pronotum and elytra subglabrous, setae microscopic, visible only under high magnification (100 3)........... 7

- Dorsal surface of head, pronotum and elytra setose, setae short or long but easily seen at low magnification (10 3)............................ 13

7(6). Pronotum subquadrate, sides not converging greatly posteriorly; pronotal foveae indistinct, 2 shallow furrows reaching across entire width of pronotum; abdominal ventrites II–IV with a pair of foveae basally at midline and without basal depressions ( Fig. 18 )........................... A. diadeletron Hartley, Andrews & McHugh new species

- Pronotum with sides converging posteriorly ( Figs. 2 , 42–44 ); with 4 distinct pronotal foveae, abdominal ventrites II–IV without foveae and with normal basal depressions ( Fig. 17 )................................ 8

8(7). Ventrite I with one or more deep, conspicuous punctures on median surface ( Figs. 17 , 50)...................................................... 9

- Ventrite I without punctures on median surface ( Figs. 49 , 51)...... 10

9(8). Pronotum laterally explanate with lobed anterior corners (e.g., Fig. 13 ); mandibles large and visible dorsally; ventrite I with several distinct punctures on median surface................................................................... A. gigas Hartley, Andrews & McHugh new species

- Pronotum only slightly explanate with evenly rounded anterior angles (e.g., Fig. 45 ); mandibles smaller, not visible dorsally; ventrite I with a single puncture at midline ( Fig. 17 )............. A. atrichos Andrews

10(8). Median surface of metasternum without punctures ( Fig. 48 )................................................................ A. hormathos Andrews

- Median surface of metasternum with scattered punctures ( Figs. 23, 24 )......................................................................... 11

11(10). Abdominal ventrite I with many faint, scattered punctures on median surface visible only on cleared and slide-mounted specimens ( Fig. 11 )............ A. polytremetron Hartley, Andrews & McHugh new species

- Abdominal ventrite I without punctures on median surface.......... 12

12(11). Y-shaped carina present on mesosternum ( Fig. 24 )........................................... A. texas Hartley, Andrews & McHugh new species

- Y-shaped carina not present on mesosternum (e.g., Fig. 23 )............................ A. delotretos Hartley, Andrews & McHugh new species

13(6). Elytron with seven striae.................................................................. A. heptalocos Hartley, Andrews & McHugh new species

- Elytron with six striae................................................... 14

14(13). Elytra with erect setae on raised intervals ( Fig. 15 ) (more conspicuous in lateral view at posterior end of elytra).............................. 15

- Elytra without erect setae on raised intervals ( Fig. 14 )............... 23

15(14). Head with erect setae present at least at posterior corners near eyes ( Figs. 1 , 32 )............................................................... 16

- Head without erect setae ( Figs. 33, 35 )................................. 18

16(15). Abdominal ventrite I impunctate on median surface; erect setae present at posterior corners of head and along lateroventral sides of head; dorsal surface of head glabrous............................................................. A. pogonias Hartley, Andrews & McHugh new species

- Abdominal ventrite I with a pair of punctures on median surface (Fig. 50); erect setae present only at posterior corners of head ( Fig. 32 ); dorsal surface of head densely setose ( Fig. 32 )......................... 17

17(16). Pronotum with wide, explanate lateral sides and sharp, 90u anterior corners ( Figs. 1 , 12 , 43 ); antennomere III narrow and 2 times longer than wide, antennal club loose and club segments elongate........................ A. hadromorphus Hartley, Andrews & McHugh new species

- Pronotum with short lateral sides and gently rounded anterior corners ( Fig. 42 ); antennomere III short, sides arcuate, antennal club shorter, club segments not distinctly elongate.............. A. anasillos Andrews

18(15). Ventrite I with a pair of punctures on median surface (Fig. 50)..... 19

- Ventrite I impunctate on median surface ( Figs. 49 , 51)............... 20

19(18). Erect setae on elytra long, stout and not recurved at the tip; eyes ( Fig. 33 ) large and prominent............................................................... A. dyskritos Hartley, Andrews & McHugh new species

- Erect setae on elytra short and recurved at the tip; eyes (e.g., Fig. 35 ) smaller, not prominent A. prionotus Hartley, Andrews & McHugh new species

20(18). Labrum anterior margin deeply emarginate ( Fig. 35 ); mandibles large and often visible dorsally................................................ 21

- Labrum anterior margin not or slightly emarginate (e.g., Figs. 32, 33 ); mandibles smaller, not visible dorsally.................................. 22

21(20). Dorsal surface of head sparsely punctate and sparsely setose, with 2 deep, conspicuous circular foveae ( Fig. 35 ); lateral pronotal margin with 2 long erect setae anteriorly and one posteriorly; elytral setation long ( Fig. 15 )......................................... A. tomeus Andrews

- Dorsal surface of head densely punctate, head foveae shallower and less distinct; lateral pronotal margin without setae; elytral setation short ( Fig. 16 ).......... A. echinos Hartley, Andrews & McHugh new species

22(20). Eye 2-faceted; elytra with both long, stout, erect setae and short decumbent setae........................................................................ A. bathytrematos Hartley, Andrews & McHugh new species

- Eye 4-faceted; elytra with only short, erect setae, the tips strongly recurved..................................................................................... A. parechinos Hartley, Andrews & McHugh new species

23(14). Elytra sparsely setose with very short decumbent setae all of the same length............................................. A. quadrifoveolata (Fall)

- Elytra densely setose; setae longer, tousled and variable in length........................ A. lasiosus Hartley, Andrews & McHugh new species

Figures

Figs. 12–16. 12) A. hadromorphus, male, pronotum outline; 13) A. lasiosus, male, pronotum outline; 14) A. chandleri, elytra, dorsolateral view, diagrammatic; 15) A. tomeus, elytra, dorsolateral view, diagrammatic; 16) A. echinos, elytra, dorsolateral view, diagrammatic.

Figs. 42–47. Akalyptoischion spp. prothorax, dorsal view, SEM. 42) A. anasillos; 43) A. hadromorphus; 44) A. dyskritos; 45) A. giulianii; 46) A. sleeperi; 47) A. chandleri.

Figs. 30–35. Akalyptoischion spp. head, dorsal view, SEM. 30) A. atrichos; 31) A. giulianii; 32) A. hadromorphus; 33) A. dyskritos; 34) A. heterotrichos; 35) A. tomeus.

Figs. 17–18. 17) A. atrichos, male, abdominal ventrites; 18) A. diadeletron, abdominal ventrites.

Figs. 2–5. A. atrichos. 2) male, prothorax, ventral view; 3) male, left antenna, dorsal view; 4) male, labium, dorsal view; 5) male, right maxilla, dorsal view.

Figs. 48–49. 48) A. hormathos metasternum, ventral view, SEM; 49) A. tomeus metasternum and abdominal ventrite I, ventral view, SEM. Figs. 50–53. Akalyptoischion spp. abdominal ventrite I, ventral view, SEM. 50) A. hadromorphus; 51) A. bathytrematos; 52) A. giulianii; 53) A. heterotrichos.

Figs. 22–24. 22) A. atrichos, male, pterothorax, ventral view; 23) A. polytremetron, female, pterothorax, ventral view; 24) A. texas, pterothorax, ventral view.

Figs. 6–11. 6) A. atrichos male, right mandible, dorsal view; 7) A. tomeus, right mandible, dorsal view; 8) A. atrichos, male, labrum, dorsal view; 9) A. tomeus, labrum outline, setae removed; 10) A. tomeus, female, abdominal ventrite I; 11) A. polytremetron, female, abdominal ventrite I.

Fig. 1. Akalyptoischion hadromorphus, habitus, dorsal view.