Diochus parvulus KRAATZ, 1860: 27 A review of the Neotropical genus Diochus ERICHSON, 1840 (Coleoptera: Staphylinidae: Staphylininae) Irmler, Ulrich Beiträge Zur Entomologie = Contributions to Entomology 2017 2017-06-30 67 1 1 62 6CW7X KRAATZ, 1860 KRAATZ 1860 [227,548,243,270] Insecta Staphylinidae Diochus Animalia Coleoptera 38 39 Arthropoda species parvulus   Figs 36A–C, 40H, 45C      Diochus parvulus KRAATZ, 1860: 27   Type material examined: male, Holotype: Brazil: Bahia, coll. Kraatz ( SDEI).  Further material examined:  Venezuela: Trujillo Prov.,  60.6 kmNW Bocono,  1900 ft.elev., litter near stream, 2 males, 5 females,  31.3.1992, leg. L. Herman(6 AMNH, 1 UIC); Tinaco, Quebradon,  Cojedes, sandy soil on the river bank,  350 melev., 3 males,  9.1.1986, leg. M.G. Paoletti( AMNH);  Los Chorros, 3 males, 5.1922, leg. F. Psota( FMNH);  Ecuador: Sucumbios, Sacha Lodge( 76°5'W, 0°5'S),  270 melevation, malaise trap, female, 3.–  13.4.1994, leg. Hibbs( KNHM);  Pichincha, Maquipucuna For. Res.,  50 kmNW Quito,  1300 melevation, banana dull berlesate, 1 male, 4 females,  3.12.1991, leg. C. Carlton& R. Leschen(4 KNHM, 1 UIC);  Napo Prov.,  33 kmN Tena, 59 kmE on Loreto Rd., litter nr. stream,  2800 ft.elev., 5 males, 2 females,  4.11.1988, leg. L. Herman( AMNH);  Napo Prov., Limoncocha,  250 melev., Berlese, forest litter, male,  25.6.1976, leg. S. Peck( FMNH);  Brazil: Mato Grosso, Campo Verde, farm Santa Luzia(55°209'W, 15°433'S), agric. field, male,  7.4.2014, leg. K. Peña Peña( UIC);  Santa Carmen, farm Dona Dozolina(55°113'W, 11°597'S), agric. field, 1 male, 3 females,  2.5.2014, leg. K. Peña Peña( UIC); same region, farm Såo Vincente(55°215'W, 12°037'S), 1 male, 3 females,  4.5.2014, leg. K. Peña Peña( UIC); 1 female,  Rio de Janeiro, leg. Squires, Sharpcoll. #1905-313 ( BMNH);  Amazonas,  15 kmSW Manaus, Ilha Marchanteria( 59°58'W, 3°15'S), tree emerg. trap, #50D, male,  18.3.1982, leg. J. Adis( UIC); same location, but floating meadow, male,  29.4.1981, leg. J. Adis( UIC); same location, but Várzea, female,  20.1.1982, leg. J. Adis( UIC);  Santa Catarina, Nova Teutonia, female, 12.1953, leg. F. Plaumann( FMNH);  Santa Rita, female, 8.1850, leg. Sahlberg( FMNH);  Paraguay: 3 females, without further data ( SDEI);  Argentina: JuJuy Prov., Termas del Reyes, 2 females,  27.12.1971, leg. L. Herman( AMNH);  Buenos Aires, female, 190?, leg. C. Bruch( FMNH).   Diagnosis:  D. parvuluscan be clearly identified by the specific paramere that is largely widened at apex and widely, but not deeply emarginate. Moreover, the colouration of the elytra with the anterior half mostly darkened paramere ( B) and antenna ( C); scale bar: A, B: 0.1 mm, C: 0.2 mm.   Figs 10–13: Diochusinornatus-group: of  D. vicinus( 10),  D. antennalis( 11),  D. novus( 12),  D. tricolor( 13); aedeagus ( A), seems to be a character that can be used to distinguish it from the related species  D. nanus,  D. perplexusand  D. apicipenniswith mostly unicoloured elytra.   Description: Length: 3.1–3.2 mm. Colouration: yellow; abdominal segments III–VI slightly darker, light brown; anterior half of elytra black; black area prolonged on disc to two third of elytral length; legs and antennae yellow with medial antennomeres darker. Head: 0.41 mmlong, 0.34 mmwide; eyes slightly prominent; temples 1.5 times as long as eyes; EL: HL = 0.28; temples slightly divergent posteriad; PW: EW = 1.12; posterior angles widely rounded to straight posterior margin; neck one third as wide as head; setiferous punctation coarse and sparse; moderately wide midline impunctate; row of five to six punctures adjacent to midline; interstices between punctures shorter on interocular area than on posterior vertex; on interocular area, interstices between punctures as wide as diameter of punctures; on posterior vertex, interstices twice or three times as wide as diameter of punctures; microsculpture weak; transverse netlike meshes; surface slightly shiny. Antennae slightly longer than head; first antennomere one fourth longer than second; second and third conical; approximately one third longer than wide; fourth to tenth antennomere wider than long; fourth only shortly wider than long; seventh to ninth antennomere twice as wide as long; tenth slightly longer; all antennomeres pubescent and with few longer setae. Pronotum: 0.49 mmlong, 0.43 mmwide; widest shortly behind middle; distinctly stronger narrowed to anterior margin than to posterior margin; in dorsal aspect, fine lateral margin visible in posterior half; anterior angles more widely rounded than posterior angles; setiferous punctures extremely sparse; row of four pairs of punctures along impunctate midline; interstice of anterior pair twice as wide as interstice between posterior pairs of punctures; few setiferous punctures laterad; microsculpture similar as on head; surface polished. Elytra: 0.48 mmlong, 0.58 mmwide; sides divergent to posterior margin; shoulders distinct, but smoothly rounded; posterior margin emarginate in concave curve; setiferous punctures in four longitudinal rows; row along suture with approximately seven punctures; surface with weak coriaceous ground sculpture; less shiny than pronotum. Abdomen with densely pubescent tergites; pubescence on apical tergites denser than on distal tergites. Aedeagus broad; seminal vesical of endophallus 0.6 times as long as central lobe; basal inner duct with looped; ending in sclotised forceps; paramere antenna ( B) and paramere ( C); scale bar: A, B: 0.1 mm, C: 0.2 mm.   Figs 14–17: Diochusinornatus-group: of  D. schuelkei( 14),  D. hermani( 15),  D. amazonenis( 16),  D. hibbsi( 17); aedeagus ( A), extremely widened at apex; slightly shorter than central lobe; apical margin with two short concave emarginations; outer angle prolonged to short acute tooth; inner angle broad and with two setae; third seta on triangular prominence between two emarginations; few sensillae in basal shaft. Spermatheca 0.18 mmlong, 0.15 mmwide; bursa copulatrix in lateral position to coiled approximately circular duct; duct few irregular coils. [471,794,393,417] Brazil Bahia 38 39 1 Bahia holotype 1992-03-31 AMNH, UIC L. Herman & Tinaco & Quebradon Venezuela 579 60.6 km NW Bocono 38 39 7 5 2 Trujillo 1986-01-09 AMNH M. G. Paoletti Venezuela 350 Cojedes 38 39 3 3 Cojedes FMNH F. Psota Venezuela Los Chorros 38 39 3 3 1994-04-13 KNHM Hibbs Ecuador 270 -0.083333336 Sacha Lodge 1308 -76.083336 38 39 1 Sucumbios 1991-03-12 KNHM, UIC C. Carlton & R. Leschen Ecuador 1300 Maquipucuna For. Res. 38 39 5 4 1 Pichincha 1988-04-11 AMNH L. Herman Ecuador 853 Loreto Rd. 38 39 7 2 5 Napo 1976-06-25 FMNH S. Peck Ecuador 250 Berlese Limoncocha 38 39 1 Napo 2014-04-07 UIC K. Pena Pena Brazil Santa Luzia Campo Verde 38 39 1 Mato Grosso 2014-05-02 UIC K. Pena Pena Brazil Dona Dozolina Santa Carmen 38 39 4 3 1 2014-05-04 UIC K. Pena Pena Brazil -12.616667 Sao Vincente 38 39 4 3 1 BMNH Squires & Sharp Brazil Rio de Janeiro 38 39 1 Rio de Janeiro 1982-03-18 UIC J. Adis Brazil -3.25 Ilha Marchanteria 1307 -59.966667 Amazonas 38 39 1 1981-04-29 UIC J. Adis Brazil -3.25 Ilha Marchanteria 1307 -59.966667 Amazonas 38 39 1 1982-01-20 UIC J. Adis Brazil -3.25 Varzea 1307 -59.966667 Amazonas 38 39 1 FMNH F. Plaumann Brazil Nova Teutonia Santa Catarina 38 39 1 FMNH Sahlberg Brazil Santa Rita 38 39 1 SDEI Paraguay Paraguay 38 39 3 3 1971-12-27 AMNH L. Herman Argentina Termas del Reyes 38 39 2 2 Jujuy FMNH C. Bruch Argentina Buenos Aires 38 39 1 Ciudad Autonoma de Buenos Aires