Hypotelus castaneus 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 : 463-464

Hypotelus castaneus Bortoluzzi & Caron sp. nov.

( Figs. 14 , 20, 21 , 28, 32 , 46,47 , 50, 54, 57 , 71, 72 , 81 , 95, 96, 97 , 113 )

Type material. Holotype deposited in FMNH, male (photo, Fig. 14 ) [damaged specimen: without left antennomeres 3–11], with labels: (1): “ PERU: Cuzco Dept.,/ Consuelo, Manu rd. / Km 165, 10-X-1982,” [white label, printed in black]; (2) “ FMHD #82-363 , ex/bamboo shoots, L. E./Watrous & G. Mazurek ” [white label, printed in black]. (3) “ HOLOTYPE / Hypotelus castaneus / Bortoluzzi & Caron ” [red label, printed in black].

Paratypes: 11 specimens, deposited in FMNH. 4 males with the same two first labels of holotype: (3) “ PARATYPE / Hypotelus castaneus / Bortoluzzi & Caron ” [yellow label, printed in black]; two of them dissected, fixed on acetate plastic card coved with Canada balsam . 7 females with the same two first labels of holotype: (3) “ PARATYPE / Hypotelus castaneus / Bortoluzzi & Caron ” [yellow, printed in black]; two of them dissected, terminalia fixed on acetate plastic card coved with Canada balsam.

Additional material. See Appendix 2.

Diagnosis. Hypotelus castaneus sp. nov. may be distinguished from other species of Hypotelus by the front with two slightly pointed frontal processes ( Figs. 20–21 ); males may be distinguished by the prominent tooth on antennal scape, antennomeres 5–11 longer than wide and apex of aedeagus wider than other ( Fig. 72 ); the shape of the bursa copulatrix ( Fig. 95 ) distinguishes females.

Description. BL: 2.6–3.0 mm, BW: 0.7–0.8 mm. Body slightly convex; dorsal surface glossy; reddish dark brown, appendages lighter ( Fig. 14 ). Dorsal integument of head and pronotum with dispersed fine punctures and undulate microstriae; elytra with dispersed fine punctures and only one longitudinal finely punctate stria close to elytral suture.

Male. Head. Supra-antennal area slightly prominent. Front with two slightly pointed frontal processes ( Figs. 20–21 ); Antennae almost reaching apex of elytra; scape with prominent tooth on inner face; antennomere 3 longer than 2; 5–11 longer than wide, with same length. Mandibles symmetrical. Mentum 1.6 times as wide as long.

Thorax. Pronotum wider than long (PW/PL=1.3); anterior angles rounded and slightly prominent; apical half with somewhat parallel sides and basal half gradually narrowing toward the base; with complete internal midlongitudinal ridge and slight longitudinal median sulcus only on disc. Elytra somewhat longer than wide (EL/ BW=1.1), covering partially or entirely abdominal tergite 3.

Abdomen. Tergite 8 with posterior margin rounded ( Fig. 50 ); sternite 8 with posterior margin narrower and rounded, with short setae except in the middle region ( Fig. 54 ); tergite 9 with short ventral struts; sternite 9 with posterior margin truncate and with two pairs of long setae; tergite 10 at apex with four setae on each side and short fringes ( Fig. 57 ). Median lobe of aedeagus truncate at apex and with one prominent process on median region at posterior margin in ventral view and curved shape in lateral view ( Figs. 71–72 ).

Female. Similar to male except for: longer distance between pointed frontal processes ( Fig. 21 ); antennae shorter, with antennomeres 5–10 shorter in length; scape without prominent tooth on inner face; abdominal sternite 8 with short setae and posterior margin emarginate except in the middle region ( Fig. 81 ); tergite 9 without ventral struts; tergite 10 weakly pigmented at apex ( Fig. 96 ); bursa copulatrix forming a narrow duct at basal half and apical half bulbous ( Fig. 95 ); ovipositor consisting of a pair of weakly pigmented hemisternites and a pair of more apical coxites, and has many long setae on apex; spermatheca with globose capsule ( Fig. 97 ).

Geographical records. Peru (Cusco), Colombia, Costa Rica (Puntarenas), Panama (Chiriqui) and Venezuela (Aragua) ( Fig. 113 ).

Biological notes. The specimens have been found in bamboo shoots, in cloud and rain forests, under a slab on pile of cut chips and bark, in floor litter on a slope above stream-good forest cover. Some specimens were collected by Berlese extraction of leaf litter.

Etymology. The specific name refers to the brown color of the entire body and it is a Latin masculine adjective: castaneus (of the color of chestnuts).

Figures

FIGURE 113. Geographical records of Hypotelus. Hypotelus laevis, Bolivia and Peru; H. micans, Brazil; H. praecox, Colombia and Ecuador; H. castaneus sp. nov., Costa Rica, Panama, Colombia, Venezuela and Peru; H. scheerpeltzi sp. nov., Peru. Countries without dots but colored represent the occurrence but no locality given.

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 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.

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.