PSEPHENIDAE KNOWN FROM

Shepard, William D. & Sites, Robert W., 2019, Larval Psephenidae (Coleoptera: Byrrhoidea) of Thailand: Annotated List and Illustrated Key to Genera, The Coleopterists Bulletin 73 (2), pp. 259-282 : 261-262

KEY TO THE SUBFAMILIES AND GENERA OF LARVAL PSEPHENIDAE KNOWN FROM THAILAND

(Larvae of Afropsephenoides Basilewsky , Heteropsephenoides Jeng and Jäch , Micreubrianax Pic , and Psephenoides Gahan are undescribed; one undescribed larva in Eubrianacinae is in our collections.)

1. Gills concealed by an operculum on the 9 th abdominal sternum ( Fig. 10 ) ................. 2

1 ʹ. Gills exposed on abdominal venter ( Fig. 11 ); operculum absent ............................... 3

2. Ninth abdominal segment surrounded by paratergites of the previous segment(s) ( Fig. 12 ). Psephenoidinae ........................... 4

2 ʹ. Ninth abdominal segment not surrounded by paratergites of the previous segment(s) ( Fig. 13 ). Eubriinae ................................... 5

3. Gills with branches arising from a central stalk ( Fig. 14 ). Psepheninae ................... .................. Mataeopsephus Waterhouse

3 ʹ. Gills palmate ( Fig. 11 ). Eubrianacinae …. 10

4. Setae on venter apically stellate ( Fig. 15 ); cephalic plate short and moderately thin ( Fig. 16 ) .................... Sinopsephenoides Yang

4 ʹ. Setae on venter apically rounded; cephalic plate usually absent, but if present, very thin and elongate ( Fig. 39 ) ............................ ....................... all other Psephenoidinae

5. Ninth abdominal segment entire posteriorly ( Fig. 17 ) ........................................... 6

5 ʹ. Ninth abdominal segment emarginate or bifurcate posteriorly ( Fig. 18 ) .................. 7

6. Paratergites apically truncate; 9 th abdominal segment as long as wide ( Fig. 35 ) ............ ................... Granuleubria Jäch and Lee

6 ʹ. Paratergites apically acicular; 9 th abdominal segment 2X longer than wide ( Fig. 33 ) .. ... .................... Homoeogenus Waterhouse

7. Meso- and metathoracic paratergites truncate laterally ( Fig. 19 ) .................................. .................... Microeubria Lee and Yang

7 ʹ. Meso- and metathoracic paratergites acicular laterally ( Fig. 20 ) ................................ 8

8. Prothoracic paratergites extending from middle of lateral margins ( Fig. 21 ) ........... ....... Dicranopselaphus Guérin-Méneville

8 ʹ. Prothoracic paratergites extending from posterolateral corners ( Figs. 34, 36 ) ……… 9

9. Body ovate, usually with color pattern ( Fig. 36 ) ............... Schinostethus Waterhouse

9 ʹ. Body elongate, usually concolorous ( Fig. 34 ) ............................. Macroeubria Pic

10. Gap between abdominal paratergites 6 and 7 ( Fig. 3 ) ........................................... 11

10 ʹ. Abdominal paratergites 6 and 7 contiguous ( Fig. 2 ) ........................................... 12

11. Periocellar lines present ( Figs. 2, 3 ) .......... ............. Jaechanax Lee, Satô, and Yang

11 ʹ. Periocellar lines absent ( Fig. 1 ) ................ ............. Odontanax Lee, Satô, and Yang

12. Periocellar lines complete ( Fig. 3 ); costal lines present ( Figs. 1–3 ) ......................... ............ Mubrianax Lee, Satô, and Yang

12 ʹ. Periocellar lines incomplete ( Fig. 2 ); costal lines absent .......................................... ............. Jinbrianax Lee, Satô, and Yang

Figures

Figs. 10–14. Morphological structures. 10) Schinostethus: Gills concealed beneath ventral operculum; 11) Undescribed Eubrianacinae: Palmate gills exposed on venter; 12) Psephenoidinae: Ninth abdominal segment surrounded by paratergites of eighth abdominal segment; 13) Schinostethus: Ninth abdominal segment not surrounded by paratergites of eighth abdominal segment; 14) Mataeopsephus: Gills with branches arising from central stalk. 7 = seventh abdominal segment; 8 = eighth abdominal segment; 9 = ninth abdominal segment.

Figs. 15–20. Morphological structures. 15) Sinopsephenoides: Stellate tubercles on venter; 16) Sinopsephenoides: Short and moderately narrow cephalic plate; 17) Granuleubria: Ninth abdominal segment entire posteriorly (from Lee et al. 2007); 18) Macroeubria: Ninth abdominal segment emarginated posteriorly; 19) Microeubria: Meso- and metathoracic paratergites truncate laterally; 20) Schinostethus: Meso- and metathoracic paratergites acicular laterally.

Figs. 37–40. Psepheninae and Psephenoidinae genera, dorsal habitus. 37) Mataeopsephus; 38) Sinopsephenoides;

Figs. 31–36. Eubriinae genera, dorsal habitus. 31) Dicranopselaphus (from Lee et al. 2007); 32) Granuleubria (from Lee et al. 2007); 33) Homoeogenus (from Lee et al. 2007); 34) Macroeubria; 35) Microeubria; 36) Schinostethus.

Figs. 21–24. Morphological structures. 21) Dicranopselaphus: Prothoracic paratergites extending from middle of lateral margins (from Lee et al. 2007); 22) Undescribed Eubrianacinae: Unique pronotal suture (yellow arrow) configuration; 23) Schinostethus: Pupa; 24) Psephenoidinae: Pupa.

Figs. 1–3. Larvae of Eubrianacinae. 1) Genus morphologically similar to Eubrianax; 2) Jinbrianax; 3) Jaechanax. app = abdominal posterior plates; cl = costal lines; cp = cephalic plate; cpl = closed periocellar line; gap = gap between abdominal paratergites 6 and 7; ipl = incomplete periocellar line; para = paratergites. All figures from Lee et al. (2007).