Hypotelus brevitarsus 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 : 462-463

Hypotelus brevitarsus Bortoluzzi & Caron sp. nov.

( Figs. 15 , 39 , 58 , 69, 70 , 80 , 98, 99 , 114 )

Type material. Holotype deposited in FMNH, male (photo, Fig. 15 ), with labels: (1) “ PANAMA: Chiriqui Prov. “ Barca ” area, Finca / Lerida nr. Boquete./III:12:1959 5650 ft.” [white label, printed in black; day and elevation handwritten]; (2) “under slab on/pile of cut chips/and bark” [white label, printed in black]; (3) “leg./ H. S. Dybas ” [white label, printed in black]; (4) “ HOLOTYPE / Hypotelus brevitarsus / Bortoluzzi & Caron ” [red label, printed in black].

Paratypes: 11 specimens, deposited in FMNH. 1 male, dissected, whole specimen fixed on acetate plastic card covered with Canada balsam, with the same three first labels of holotype: (4) “ PARATYPE / Hypotelus brevitarsus / Bortoluzzi & Caron ” [yellow label, printed in black] . 1female, dissected, terminalia fixed on acetate plastic card covered with Canada balsam, with same three first labels of holotype: (4) “ PARATYPE / Hypotelus brevitarsus / Bortoluzzi & Caron ” [yellow label, printed in black] . 1 female, dissected, terminalia fixed on acetate plastic card covered with Canada balsam, with same three first labels of holotype, except for the date: “III:14:1959.”: (4) “ PARATYPE / Hypotelus brevitarsus / Bortoluzzi & Caron ” [yellow label, printed in black] . 7 specimens, sex undetermined, with same three first labels of holotype: (4) “PARATYPE/ Hypotelus brevitarsus /Bortoluzzi & Caron” [yellow label, printed in black]; one specimen of them with additional label: (4) “ Hypotelus /det. Newton 1994” [white label, first line, handwritten; second line, printed in black]; (5) “PARATYPE/ Hypotelus brevitarsus / Bortoluzzi & Caron” [yellow label, printed in black]. 1 specimen, sex undetermined, with same three first labels of holotype, except for the date: “III:14:1959.”: (4) “PARATYPE/ Hypotelus brevitarsus /Bortoluzzi & Caron” [yellow label, printed in black].

Additional material. See Appendix 2.

Diagnosis. Hypotelus brevitarsus sp. nov. is similar to H. pusillus and differs by the antennal scape of male without prominent tooth on inner face; the antennae shorter, not reaching half-length of elytra; and tergite 10 with lateral sides at posterior margin emarginated in both sexes ( Figs. 58 , 98 ), besides the genital structures (see below). H. brevitarsus sp. nov. may be distinguished from other species of Hypotelus by the metatarsomeres 5 somewhat shorter and transverse ( Fig. 39 ), although in some specimens this is not so prominent.

Description. BL: 2.2–2.9 mm, BW: 0.6–0.8 mm. Body slightly convex; dorsal surface glossy; brown (elytra yellow); appendages lighter, except mandibles. Dorsal integument of head and pronotum with dispersed fine punctures and undulate microstriae only on margins; elytra with dispersed fine punctures and only one longitudinal finely punctate stria close to elytral suture.

Male. Head. Supra-antennal area slightly prominent. Antennae reaching humeral angle; antennomeres 5, 7, 9 and 11 with longest setae on inner face; antennomeres 2 and 3 of equal length, 5–11 gradually increasing in length toward antennal apex. 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 basal half. Elytra somewhat longer than wide (EL/ BW=1.1), covering partially or not abdominal tergite 3. Metatarsomeres 5 somewhat shorter and transverse ( Fig. 39 ).

Abdomen. Tergite 8 with posterior margin rounded; sternite 8 with posterior margin rounded; tergite 9 with short ventral struts; sternite 9 with posterior margin truncate and with two pairs of long setae; tergite 10 with posterior and lateral margins weakly pigmented, with short fringes and four setae on each side ( Fig. 58 ). Median lobe of aedeagus with bulbous base in ventral view and curved shape in lateral view ( Figs. 69–70 ).

Female. Similar to male except for: without very long setae on antennomeres 5, 7, 9 and 11; abdominal sternite 8 with posterior margin somewhat truncate and posterio-laterally slightly emarginated, with short setae ( Fig. 80 ); tergite 9 without ventral struts; bursa copulatrix as H. pusillus ; 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. 99 .

Geographical records. Panama (Chiriqui) ( Fig. 114 ).

Biological notes. This species was collected at elevations between 4750 ft (1447 m) and 6900 ft (2013 m), under a slab on a pile of cut chips and bark, in a split sapling, in scraping, in torn fibers of a wounded tree and under bark of a log on the ground.

Remarks. Some specimens may have the metatarsomeres a little less transverse. The longest setae on inner face of antennomeres 5, 7, 9 and 11 are sometimes not so visible.

In the material examined, there are five specimens collected from 4750ft (1447 m), which do not have the metatarsomeres 5 shorter and transverse, and we are unable to segregate these 5 specimens into more than one species. The feature metatarsomere 5 shorter and transverse is only visible on the specimens collected above 5000ft (1524 m).

Etymology. The specific name refers to the shape of the metatarsus and is a compound name: Latin adjective brev - (short), the connective vowel i, and the Greek noun latinized to tarsus (foot). It is a noun in apposition.

Figures

FIGURE 114. Geographical records of Hypotelus. Hypotelus andinus, Colombia, Ecuador and Bolivia; H. insulanus, Caribbean islands; H. marginatus, Colombia, Venezuela and Guatemala; H. testaceus, Panama; H. brevitarsus sp. nov., Panama. 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 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.