Hypotelus melanodelta 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 : 474

Hypotelus melanodelta Bortoluzzi & Caron sp. nov.

( Figs. 13 , 79 , 91 )

Type material. Holotype deposited in FMNH, female (photo, Fig. 13 ) [damaged specimen: without right antennomeres 3–11. Dissected , body glued on white card; abdominal segments 8 to 10 and spermatheca fixed on acetate plastic card and covered with Canada balsam], with labels: (1) “ Columbia occ./ Cali, Fassl ” [old white label, printed in black]; (2) “ Chicago NHMus/ M.Bernhauer / Collection ” [old white label, printed in black]; (3) “ micans Shp. ?[?]/var/det. Bernh. ” [old white label, handwritten, last line printed in black]; (4) “ HOLOTYPE / Hypotelus melanodelta / Bortoluzzi & Caron ” [red label, printed in black].

Diagnosis. Hypotelus melanodelta sp. nov. may be distinguished from other species of Hypotelus by the large darker V-shaped area on the elytra and antennomeres 5–10 wider than long ( Fig. 13 ); sternite 8 with posterior margin sinuous ( Fig. 79 ).

Description. BL: 2.8 mm, BW: 0.7 mm. Body slightly convex; dorsal surface glossy; brownish, except elytra yellowish (with basal darker area forming somewhat an inverted triangle reaching the middle of elytral suture) ( Fig. 13 ); legs reddish yellow. 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.

Female. Head. Supra-antennal area slightly prominent. Antennae reaching humeral angle; antennomeres 2 and 3 of equal length, antennomere 4 shortest and 5–10 wider than long; 11 longer than the preceding antennomeres.

Thorax. Pronotum wider than long (PW/PL=1.2); 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; one pair of conspicuous setae on anterior margin. Elytra somewhat longer than wide (EL/BW=1.2), not covering abdominal tergite 3.

Abdomen. Abdominal tergite 8 with posterior margin rounded; sternite 8 with posterior margin sinuous and with short setae ( Fig. 79 ); tergite 10 with lateral and posterior margins weakly pigmented, with short fringes and four setae on each side at apex; 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. 91 . Male. Unknown.

Geographical records. Colombia.

Biological notes. No data.

Remarks. We received a single specimen (female) from FMNH identified previously as H. micans by Bernhauer, which we consider here as a new species, since the antennomeres 2 and 3 are the same length, in contrast to H. micans that antennomere 3 much shorter than 2 ( Sharp 1876, original description), besides the large darker area on elytra.

Etymology. The specific name refers to the dark color pattern of elytra and it is a compound name: Greek adjective melan - (black, dark), the connective vowel o, and the Greek noun delta (shaped like a triangle). It is a noun in apposition.

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 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.