Picrotini

Gimmel, Matthew L. & Leschen, Richard A. B., 2022, Revision of the genera of Picrotini (Coleoptera: Cryptophagidae: Cryptophaginae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 62 (1), pp. 61-109 : 66-67

Key to genera of Picrotini

1 Elytra with punctures arranged into distinct rows ( Fig. 66 ); New Guinea. ... Papuacryptus gen. nov.

– Elytral punctation confused; not in New Guinea. .............................................................. 2

2(1) Pronotal lateral bead about as wide as antennal club; New Zealand. ............ Picrotus Sharp, 1886

– Pronotal lateral bead normal, not nearly as wide as antennal club. ..................................................... 3

3(2) All abdominal ventrites connate; New Zealand. .. ................................... Connatocryptus gen. nov.

– Abdominal ventrites 1 and 2 connate ( Fig. 96 ), or all ventrites free ( Fig. 95 ). ................................. 4

4(3) Abdominal ventrites 1 and 2 connate ( Fig. 96 ); without knob-like structures at the anterior pronotal angles; Australia. ................................. 5

– No abdominal ventrites connate ( Fig. 95 ), or if ventrites 1 and 2 connate ( Ostreacryptus helmsi ), with prominent knob-like structures at the anterior pronotal angles ( Figs 58 , 87 ). ............................ 7

5(4) Antennal club of 2 antennomeres ( Fig. 80 ); gena with broad antennal groove. ................................. ........................................ Paragnetaria gen. nov.

– Antennal club of 3 antennomeres; gena without antennal groove. ................................................. 6

6(5) Anterior angles of pronotum sharp, right-angled ( Figs 9–11 ); elytra patterned ( Figs 9–11 ). ............ ........................................... Bellascelis gen. nov.

– Anterior angles of pronotum more rounded, obtuse ( Figs 52–55 ); elytra not patterned ( Figs 52–55 ). .. .......................................... Orthoscelis gen. nov.

7(4) Antennal club clearly composed of 2 antennomeres ( Fig. 1 ); Australia. ........... Agnetaria Bruce, 1953

– Antennal club of 3 antennomeres (antennomere 9 may be narrower than 10 (e.g., Fig. 71 ), but distinctly wider than 8). ..................................... 8

8(7) Pronotal platform present at or near anterior angle of pronotum, with or without a distinct dorsal rim ( Figs 82–84, 88, 89 ). .......................................... 9

– Pronotal platform absent ( Figs 85, 86 ). ........... 10

9(8) Superior elytral epipleural carina terminating anteriorly in a sharp spine at humeral angle of elytra ( Fig. 79 ); vertex with deep transverse impression, frons with a transverse swelling ( Fig. 89 ); New Zealand. ..... Humerocryptus gen. nov.

– No sharp spine at humeral angle of elytra; vertex without deep impression or swelling ( Figs 82–84 ); New Zealand and Australia. .................................. .......................... Antarcticotectus Brookes, 1951

10(8) Body mostly shining, with setae very inconspicuous, punctures of pronotum separated by more than their diameter over most of dorsal surface ( Figs 12 , 29–32 , 70–76 ); antenna inserted into deep concavity, raised portion of frons between antennal insertions constricted, narrower than width of antennal club; eye reduced. ....... 11

– Body usually dull, densely setose OR if setae inconspicuous, antenna not inserted into deep concavity, frons wide and not constricted between antennal insertions, usually much wider than antennal club; eye not reduced. ....................... 13

11(10) Postcoxal lines present on ventrite 1 (absent in one undescribed species of Thortus ). ..................... 12

– Postcoxal lines absent from ventrite 1; Chile and Australia. ................. Neopicrotus Leschen, 1996

12(11) Eyes conical in dorsal view; frons with weakly carinate elevation between antennal insertions; decumbent setae of elytra undulate; bicolored ( Fig. 12 ); Chile. ............ Chileothortus gen. nov.

– Eyes flat or rounded in dorsal view; frons without carinate elevation between antennal insertions; decumbent setae of elytra uniformly directed posteriorly; unicolored ( Figs 70–76 ); New Zealand. ............................. Thortus Broun, 1893

13(10) Anterior angle of pronotum sharp, acute to rightangled ( Figs 6–8 ); Australia. ................................ .......................................... Austroscelis gen. nov.

– Anterior angle of pronotum rounded, obtuse. ... 14

14(13) Lateral carina of pronotum with posteriorly pointed teeth, teeth asetose ( Fig. 78 ); Ecuador and New Zealand. ........... Odontosomatula gen. nov.

– Lateral carina of pronotum without posteriorly pointed teeth (but may have setigerous tubercles). .......................................................................... 15

15(14) Anterior corners of pronotum protruding laterally, forming weak to strong knob-like structures ( Figs 56–65 , 87 ); Australia, New Zealand, Chile. ......... .............................. Ostreacryptus Leschen, 2001

– Anterior corners of pronotum not protruding laterally. ........................................................... 16

16(15) Lateral bead of pronotum with glabrous space, appearing doubled from certain angles ( Fig. 85 ); Chile. ................................ Chiliotis Reitter, 1875

– Lateral bead of pronotum without obvious glabrous space, not appearing doubled ( Fig. 86 ); Australia, New Zealand, Juan Fernandez Islands. ............ 17

17(16) Pronotum evenly convex, without distinct pits or basal impressions ( Figs 21–25 ); tempora absent; Juan Fernandez Islands. ................................... 18

– Pronotum (and often elytra) with either basal pits or impression(s), or both; tempora usually present; not in Juan Fernandez Islands. ......................... 19

18(17) Eyes finely faceted; discrimen at least half length of metaventrite; pronotum narrower than elytra ( Fig. 21 ); elytra with distinct punctures; Alexander Selkirk Island. ....... Cryptosomatula Bruce, 1940

– Eyes coarsely faceted ( Fig. 81 ); discrimen less than half length of metaventrite; pronotum as wide or nearly as wide as elytra ( Figs 22–25 ); elytra with punctures very light, nearly effaced; Robinson Crusoe Island. ....................................... ..... Cryptothelypterus Leschen & Lawrence, 1991

19(17) Discrimen absent; pronotum highly constricted basally ( Fig. 20 ); elytra with two pairs of silvery patches of setae ( Fig. 20 ); Australia. .................... .................................... Cordosomatula gen. nov.

– Discrimen present; pronotum not or weakly constricted at base; Australia, New Zealand. ... 20

20(19) Metaventrite with divergent postcoxal lines ( Fig. 91 ); with deep circular impression in center of pronotum ( Fig. 26 ); New Zealand. ....................... ....................................... Foveocryptus gen. nov.

– Metaventrite without postcoxal lines ( Fig. 92 ); without deep circular impression in center of pronotum. ......................................................... 21

21(20) Pronotum asymmetrically crenulate ( Fig. 77 ); prosternal process with fine median carina; Chile. ................................. Chimaerocryptus gen. nov.

– Pronotum not asymmetrically crenulate; prosternal process lacking carina ( Fig. 90 ); Australia and New Zealand. ................... Notocryptus gen. nov.

Figures

Figs 64–72. Habitus of species of Picrotini. 64 – Ostreacryptus n. sp. 4 (Australia: NSW, Tas, Vic); 65 – Ostreacryptus n. sp. 5 (New Zealand); 66 – Papuacryptus striatopunctatus sp. nov.; 67 – Paragnetaria slipinskii sp. nov.; 68 – Picrotus thoracicus Sharp, 1886; 69 – Picrotus n. sp. 1 (New Zealand); 70 – Thortus amoenus (Broun, 1912); 71 – Thortus ovalis Broun, 1893; 72 – Thortus n. sp. 1 (New Zealand: Auckland Islands). Scale bars = 1 mm. Abbreviations: pc = paramedial carina.

Figs 95–97. Abdomens and aedeagus viewed with partial transmitted light. 95–96 – abdomen. 95 – Antarcticotectus silvanus (Broun, 1880); 96 – Orthoscelis transversus sp. nov. 97 – aedeagus, dorsal and right lateral views, Antarcticotectus silvanus. Abbreviations: bp = basipenis; dp = distipenis.

Figs 55–63. Habitus of species of Picrotini. 55 – Orthoscelis n. sp. 3 (Australia: NSW, Qld, Vic); 56 – Ostreacryptus basalis (Grouvelle, 1919); 57 – Ostreacryptus clarkae Leschen, 2001; 58 – Ostreacryptus helmsi (Reitter, 1880); 59 – Ostreacryptus insignis (Reitter, 1880); 60 – Ostreacryptus nigroapicalis (Blackburn, 1903); 61 – Ostreacryptus n. sp. 1 (Australia: WA); 62 – Ostreacryptus n. sp. 2 (Australia: Tas); 63 – Ostreacryptus n. sp. 3 (Australia: ACT). Scale bars = 1 mm.

Figs 82–89. Head and pronotum of Picrotini. 82–88 – lateral view. 82 – Antarcticotectus rutilus (Broun, 1880); 83 – Antarcticotectus silvanus (Broun, 1880); 84 – Antarcticotectus tasmanicus (Blackburn, 1907); 85 – Chiliotis sp.; 86 – Notocryptus australis (Redtenbacher, 1868); 87 – Ostreacryptus helmsi (Reitter, 1880); 88 – Humerocryptus n. sp. 1. 89 – dorsolateral view, Humerocryptus tumidus (Broun, 1893).Abbreviations: lgs = lateral glabrous space.

Figs 77–81. Characters of Picrotini. 77–78 – detail of pronotum. 77 – Chimaerocryptus johnsoni sp. nov.; 78 – Odonotosomatula carltoni sp. nov. 79 – pronotum and base of elytra, Humerocryptus n. sp. 1. 80 – antennal club, Paragnetaria slipinskii sp. nov. 81 – eye, Cryptothelypterus pteropilosus Leschen & Lawrence, 1991. Abbreviations: pp = paralateral plica.

Figs 1–9. Habitus of species of Picrotini. 1 – Agnetaria pilosella (Blackburn, 1891); 2 – Antarcticotectus rutilus (Broun, 1880); 3 – Antarcticotectus silvanus (Broun, 1880); 4 – Antarcticotectus tasmanicus (Blackburn, 1907); 5 – Antarcticotectus n. sp. 1 (New Zealand); 6 – Austroscelis gibbipennis (Blackburn, 1892); 7 – Austroscelis n.sp.1 (Australia:NSW, Vic); 8 – Austroscelis n.sp. 2 (Australia:WA); 9 – Bellascelis pecki sp.nov. Scale bars = 1 mm.

Figs 10–18. Habitus of species of Picrotini. 10 – Bellascelis n. sp. 1 (Australia: Qld); 11 – Bellascelis n. sp. 2 (Australia: NSW); 12 – Chileothortus infuscatus sp. nov.; 13 – Chiliotis sp. 1; 14 – Chiliotis sp. 2; 15 – Chiliotis sp. 3; 16 – Chiliotis sp. 4; 17 – Chiliotis sp. 5; 18 – Chimaerocryptus johnsoni sp. nov. Scale bars = 1 mm.

Figs 46–54. Habitus of species of Picrotini. 46 – Notocryptus n. sp. 10 (Australia: NSW, Tas); 47 – Notocryptus n. sp. 11 (Australia: NSW, Qld, Vic); 48 – Notocryptus n. sp. 12 (Australia: NSW, Qld, Vic); 49 – Notocryptus n. sp. 13 (Australia: Qld); 50 – Odontosomatula carltoni sp. nov.; 51 – Odontosomatula n. sp. 1 (New Zealand); 52 – Orthoscelis transversus sp. nov.; 53 – Orthoscelis n. sp. 1 (Australia: NSW, Qld, Tas, Vic); 54 – Orthoscelis n. sp. 2 (Australia: ACT, NSW, Tas, Vic). Scale bars = 1 mm.

Figs 28–36. Habitus of species of Picrotini. 28 – Humerocryptus n. sp. 1 (New Zealand); 29 – Neopicrotus peckorum Leschen, 1996; 30 – Neopicrotus n. sp. 1 (Chile); 31 – Neopicrotus n. sp. 2 (Australia); 32 – Neopicrotus n. sp. 3 (Australia); 33 – Notocryptus australis (Redtenbacher, 1868); 34 – Notocryptus discoideus (Broun, 1893); 35 – Notocryptus distinctus (Broun, 1893); 36 – Notocryptus lindensis (Blackburn, 1891). Scale bars = 1 mm.

Figs 19–27. Habitus of species of Picrotini. 19 – Connatocryptus utiku sp. nov.; 20 – Cordosomatula magnabagishae sp. nov.; 21 – Cryptosomatula longicornis Bruce, 1940; 22 – Cryptothelypterus atomarioides (Grouvelle, 1919); 23 – Cryptothelypterus obrieni Leschen & Lawrence, 1991; 24 – Cryptothelypterus pteropilosus Leschen & Lawrence, 1991; 25 – Cryptothelypterus splendens (Bruce, 1940); 26 – Foveocryptus chenyandongi sp. nov.; 27 – Humerocryptus tumidus (Broun, 1893). Scale bars = 1 mm.

Figs 90–94. Ventral characters of Picrotini. 90 – prosternum, Notocryptus n. sp. 11. 91–92 – metaventrite.91 – Foveocryptus chenyandongi sp. nov.; 92 – Notocryptus n. sp. 12. 93–94 – basal abdominal ventrites. 93 – Austroscelis gibbipennis (Blackburn, 1891); 94 – Cordosomatula magnabagishae sp. nov.