Thyestetha, Pascoe, 1865

Eberle, Jonas, Tänzler, Rene & Riedel, Alexander, 2012, Revision and phylogenetic analysis of the Papuan weevil genus Thyestetha Pascoe (Coleoptera, Curculionidae, Cryptorhynchinae), Zootaxa 3355 (1), pp. 1-28 : 4

Key to the species of Thyestetha

1 Elytral disc glabrous, impunctate ( Figs. 11, 13–14, 18 ). Rostral canal subglabrous................................... 2

1’ Elytral disc with distinct strial punctures ( Figs. 10, 12, 15–17 ). Rostral canal at least between procoxae squamose......... 5

2 Prothorax and elytra with colored lustre ( Figs. 9 , 18 ). Elytra 0.8 X wider than long...... T. splendens Eberle & Riedel sp. n.

2’ Prothorax and elytra polished, but without colored lustre. Elytra ca. 1.0 X as wide as long............................ 3

3 Elytra ferruginous except apical half laterally black ( Fig. 11 ). Aedeagus in profile less markedly curved ( Fig. 40 )..................................................................................... T. discolor Eberle & Riedel sp. n.

3’ Elytra uniformly black. Aedeagus in profile markedly curved ( Figs. 42, 46 )........................................ 4

4 Sides of aedeagus subapically converging in straight line ( Fig. 41 )...................... T. glabra Eberle & Riedel sp. n.

4’ Sides of aedeagus subapically converging in sinuate line ( Fig. 45 )...................... T. lubrica Eberle & Riedel sp. n.

5 Elytral disc with minute punctures; interstices between punctures 4– 6 X their diameter; female elytral apex medially distinctly emarginate.............................................................. T. emarginata Eberle & Riedel sp. n.

5’ Elytral disc with small punctures; interstices between punctures <4 X their diameter; female elytral apex without emargination....................................................................................................6

6 Elytra black. Apex of aedeagus weakly curved ventrad ( Fig. 50 )....................... T. oblita Eberle & Riedel sp. n.

6’ Elytra ferruginous, sometimes very dark. Apex of aedeagus markedly curved ventrad ( Figs. 38, 48, 52 ).................. 7

7 Habitus elongate; elytra usually ferruginuous, sometimes black, apex extended ( Figs. 6 , 15 , 69–70). Rostral canal and marginal carina densely covered with broad whitish scales. Aedeagus with sides apically converging in sinuate line ( Fig. 47 ).. T. nitida

7’ Habitus shorter, ovate; elytra black, apex less distinctly extended ( Figs. 1, 8 , 10, 17 ). Rostral canal only between procoxae squamose; marginal carina bordered with small whitish scales. Aedeagus with sides apically converging in straight line ( Figs. 37, 51 ).............................................................................................. 8

8 Interstices between punctures of elytral striae 1– 3 X diameter of punctures; male metafemur in apical third with weakly protruding posteroventral ridge (Fig. 27)......................................... T. puncticollis Eberle & Riedel sp. n.

8’ Interstices between punctures of elytral striae 2– 4 X diameter of punctures; male metafemur in apical third with sharply protruding posteroventral ridge (Fig. 26)........................................................... T. carbonaria

Figures

FIGURES 10 – 18. Habitus of Thyestetha spp., lateral aspect: (10) T. carbonaria, lectotype; (11) T. discolor sp. n., holotype; (12) T. emarginata sp. n., holotype; (13) T. glabra sp. n., holotype; (14) T. lubrica sp. n., holotype; (15) T. nitida, lectotype; (16) T. oblita sp. n., holotype; (17) T. puncticollis sp. n., holotype; (18) T. splendens sp. n., holotype.

FIGURES 1 – 9. Habitus of Thyestetha spp., dorsal aspect: (1) T. carbonaria, lectotype; (2) T. discolor sp. n., holotype; (3) T. emarginata sp. n., holotype; (4) T. glabra sp. n., holotype; (5) T. lubrica sp. n., holotype; (6) T. nitida; (7) T. oblita sp. n., holotype; (8) T. puncticollis sp. n., holotype; (9) T. splendens sp. n., holotype.

FIGURES 37 – 54. Aedeagus of Thyestetha spp. in dorsal and lateral aspect: (37, 38) T. carbonaria, lectotype; (39, 40) T. discolor sp. n., holotype; (41, 42) T. glabra sp. n., holotype; (43) T. carbonaria, apex of aedeagus, ventral aspect; (44) T. oblita sp. n., holotype, apex of aedeagus, ventral aspect; (45, 46) T. lubrica sp. n., holotype; (47, 48) T. nitida, lectotype; (49, 50) T. oblita sp. n., holotype; (51, 52) T. puncticollis sp. n., holotype and (53, 54) T. splendens sp. n., holotype.