Hypotelus corniculatus Bortoluzzi & Caron

Bortoluzzi, Sidnei, Caron, Edilson & Ribeiro-Costa, Cibele S., 2017, Revision and phylogeny of Hypotelus Erichson: a Neotropical genus of minute rove beetles (Coleoptera, Staphylinidae, Piestinae), Zootaxa 4273 (4), pp. 451-487 : 464-471

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 ).

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.

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.

Figures

FIGURES 9 – 19. Habitus, dorsal view. 9, Hypotelus insulanus, syntype, male; 10, H. praecox, lectotype, female; 11, H. scheerpeltzi sp. nov., holotype, male; 12, H. testaceus, syntype, male; 13, H. melanodelta sp. nov., holotype, female; 14, H. castaneus sp. nov., holotype, male; 15, H. brevitarsus sp. nov., holotype, male; 16, H. corniculatus sp. nov., holotype, female; 17, H. marginatus, syntype, male; 18, H. laevis, male; 19, H. andinus. Scale bars = 1 mm.

FIGURES 20 – 24. Head and pronotum, dorsal view. 20, Hypotelus castaneus sp. nov., male; 21, H. castaneus sp. nov., female; 22, H. corniculatus sp. nov., female; 23, H. laevis, male; 24, H. laevis, female. Scale bars = 0.5 mm.

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.