Revision and phylogeny of Hypotelus Erichson: a Neotropical genus of minute rove beetles (Coleoptera, Staphylinidae, Piestinae) Author Bortoluzzi, Sidnei Author Caron, Edilson Author Ribeiro-Costa, Cibele S. text Zootaxa 2017 4273 4 451 487 journal article 32893 10.11646/zootaxa.4273.4.1 3f4e48f2-f9a0-434e-8ec3-be455a1ec995 1175-5326 803644 310C1107-096C-4C9B-A131-B0F69DB938E8 Hypotelus corniculatus Bortoluzzi & Caron sp. nov. ( Figs. 16 , 22 , 100, 101, 102 ) Type material. Holotype deposited in FMNH , female (photo, Fig. 16 , image by Crystal Maier , copyright Field Museum of Natural History , Chicago ) [ Dissected , body glued on white card; abdominal segments 8 to 10 fixed on acetate plastic card and covered with Canada balsam], with labels: (1) “ Chitaría , Alto Sl / Corrial [?], 9-13.IV.41 ./ Costa Rica ” [old white label, handwritten]; (2) “Field Mus. Nat. Hist./1966/A, Bierig Colln./Acc. Z-13812” [white label, printed in black]; (3) “ HOLOTYPE / Hypotelus corniculatus / Bortoluzzi & Caron ” [red label, printed in black]. Diagnosis. Hypotelus corniculatus sp. nov. may be distinguished from other species of Hypotelus by the deflected and projected front with two small and pointed frontal processes ( Fig. 22 ), antennomeres 5–11 longer than wide ( Fig. 16 ) and by the shape of the bursa copulatrix ( Fig. 100 ). FIGURES 25–35. 25–27, Hypotelus pusillus . 25, antenna, male; 26, antenna, female; 27, labrum, dorsal view, left epipharynx and right setae removed; 28, H. castaneus sp. nov. , labrum, dorsal view, left epipharynx and right setae removed; 29, H. pusillus , mandibles, dorsal view, right prostheca removed; 30, H. laevis , mandibles, dorsal view, right prostheca removed; 31, H. pusillus , labium, ventral view, left setae of the ligula and right setae of the mentum removed; 32, H. castaneus sp. nov. , labium, ventral view, left setae of the ligula and right setae of the mentum removed; 33, H. pusillus , maxilla, ventral view; 34– 35, H . pusillus , pronotum, lateral and ventral view, respectively. Scale bars: Figs. 25–26 = 0.5 mm; Figs. 27–33 = 0.125 mm; Figs. 34–35 = 0.25 mm. FIGURES 36–47. 36–38, Hypotelus pusillus . 36, anterior leg, posterior view; 37, median leg, posterior view; 38, hind leg, posterior view. 39, H. brevitarsus sp. nov. , metatarsus, lateral view. 40–45, H. pusillus . 40, tergites 1–3, dorsal view; 41, sternites 1–3, ventral view; 42, tergite 8, female, dorsal view, setae removed (drawn under microscope slides, plates were separated); 43, sternite 8, lateral view; 44, sternite 9, male, ventral view; 45, ovipositor, female, ventral view. 46–47, H. castaneus sp. nov. 46, abdominal segments 7–9, male, ventral view; 47, abdominal segments 7–8, female, ventral view. Scale bars = 0.125 mm, except Fig. 40 = 0.25 mm and Figs. 46–47= 0.5 mm. FIGURES 48–58. Tergites and sternites of males in dorsal and ventral view, respectively and right setae removed. 48, Hypotelus pusillus , tergite 8; 49, H. scheerpeltzi sp. nov. , tergite 8; 50, H . castaneus sp. nov. , tergite 8; 51, H. pusillus , sternite 8; 52, H. insulanus , sternite 8; 53, H. testaceus , sternite 8; 54, H . castaneus sp. nov. , sternite 8; 55, H. pusillus , tergites 9 and 10; 56, H. insulanus , tergite 10; 57, H . castaneus sp. nov. , tergite 10; 58, H. brevitarsus sp. nov. , tergite 10. Scale bars = 0.125 mm. FIGURES 59–74. Aedeagus, for each species with lateral view and ventral view, respectively. 59–60, Hypotelus pusillus ; 61– 62, H. insulanus ; 63–64, H. marginatus ; 65–66, H. testaceus ; 67–68, H. praecox ; 69–70, H. brevitarsus sp. nov. , parameres removed in ventral view; 71–72, H . castaneus sp. nov. ; 73–74, H . scheerpeltzi sp. nov. Scale bars = 0.125 mm. FIGURES 75–82. Sternite 8 of females in ventral view, right setae removed. 75, Hypotelus pusillus ; 76, H. insulanus ; 77, H. marginatus ; 78 H. testaceus ; 79, H. melanodelta sp. nov. ; 80, H . brevitarsus sp. nov. ; 81, H . castaneus sp. nov. ; 82, H . scheerpeltzi sp. nov. Scale bars = 0.125 mm. Description. BL: 4.2 mm , BW: 1.0 mm. Body slightly convex ( Fig. 16 ); dorsal surface matte (except elytra glossy); entirely brown with legs a little lighter. Dorsal integument of head and pronotum with fine punctures and granulate microsculpture; elytra with one longitudinal finely punctate stria close to internal margin; abdomen with fine punctures and granulate microsculpture. Female. Head . Supra-antennal area visibly prominent, deflected front and with pair of small and pointed frontal processes, about half-length of scape ( Fig. 23–24 ). Antennae almost reaching apex of elytra; some long setae on apex of antennomeres 3–11; antennomere 2 slightly shorter than 3; 5–11 longer than wide and gradually increasing in length toward antennal apex. Mandibles symmetrical. Thorax. Pronotum wider than long (PW/PL=1.45); anterior angles rounded and slightly prominent; apical twothirds with somewhat curved sides and basal one-third gradually narrowing toward the base; with complete internal mid-longitudinal ridge and slight longitudinal median sulcus on almost entire length of pronotum; small depression at middle on basal half, near to posterior margin. Elytra somewhat longer than wide (EL/BW=1.2), not covering abdominal tergite 3. FIGURES 83–108. Tergites in dorsal view, right setae removed, and genitalia of female. 83–84, Hypotelus pusillus . 83, tergite 9, 10 and bursa copulatrix; 84, spermatheca. 85–86, H. insulanus . 85, tergite 10; 86, spermatheca. 87, H. marginatus , spermatheca. 88–90, H. testaceus . 88, bursa copulatrix; 89, tergite 10; 90, spermatheca. 91, H. melanodelta sp. nov. , spermatheca. 92–94, H. praecox . 92, bursa copulatrix; 93, tergite 10; 94, spermatheca, 95–97, H . castaneus sp. nov. 95, bursa copulatrix; 96, tergite 10; 97, spermatheca. 98–99, H . brevitarsus sp. nov. 98, tergite 10; 99, spermatheca. 100–102, H. corniculatus sp. nov. 100, bursa copulatrix; 101, tergite 10; 102, spermatheca. 103–105, H. laevis . 103, bursa copulatrix; 104, tergite 10; 105, spermatheca. 106–108, H . scheerpeltzi sp. nov. 106, bursa copulatrix; 107, tergite 10; 108, spermatheca. Scale bars = 0.125 mm. Abdomen. Tergite 8 with posterior margin truncate; sternite 8 with posterior margin rounded and with short setae; tergite 10 with posterior margin weakly pigmented, with short fringes and three setae on each side at apex ( Fig. 101 ); bursa copulatrix as Fig. 100 ; ovipositor consisting of a pair of weakly pigmented hemisternites and a pair of more apical coxites, and with many long setae on apex; spermatheca as Fig. 102 . Male. Unknown. Geographical records. Costa Rica. Biological notes. No data. Etymology. The specific name refers to the small “horns” on front of the head and it is a Latin masculine adjective, corniculatus , which means horned.