Atopida impressa Broun 1914
Creators: name: Kiałka, Agata
name: Ruta, Rafał
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scirtidae
Atopida
Atopida impressa

description: Atopida impressa Broun, 1914
(Figs 1G–I, 5E–F, 6B, 8C–D, 10C, 12C, 17H)
Atopida impressa Broun, 1914: 105.
Atopida impressa: Macfarlane et al. 2011: 420 (catalogue); Kiałka & Ruta 2017: 24 (catalogue).
Atopida pallidula, Broun, 1921: 535 syn. nov.
Atopida pallidula: Macfarlane et al. 2011: 420 (catalogue); Kiałka & Ruta 2017: 24 (catalogue).
Type material. Holotype of A. impressa (NHM): card-mounted, “3418.” [in Broun’s hand], “Seaward Moss \ 30/9/10.” [handwritten], “ New Zealand. [red underline] \ Broun Coll. \ Brit. Mus. \ 1922-482.”, “ Atopida \ impressa” [in Broun’s hand]. Holotype of A. pallidula (NHM): card-mounted, “4062.” [in Broun’s hand], “ New Zealand. [red underline] \ Broun Coll. \ Brit. Mus. \ 1922-482.”, “Bluff \ 1.12.1914 ” [in Broun’s hand], “ Atopida \ pallidula” [in Broun’s hand].
Other material examined. 3 exx. (NZAC): “ NEW ZEALAND SL \ Slopedown, 580 m \ Mokoreta No 2 \ 23 Nov \ 12 Dec 1985 ”, “B.I.P. Baratt \ Pit trap in \ shrubland”; 12 exx. (NZAC): “Rakeahua \ Valley”, “19.ii.68 \ G. Kuschel”, “Stewart I. \ Exp. Feb. 1968 ”; 2 exx. (NZAC): “Rakeahua V. \ to m. v. light ”, “10.ii.68 \ J. S. Dugdale”, “Stewart I. \ Exp. Feb. 1968 ”; 1 ex. (NZAC): “ Rakeahua \ Valley ”, “South bank \ bush”, “12 Feb 68 \ J. S. Dugdale ”; 1 ex. (NZAC): “ Mt. Rakeahua \ 1800-2100’”, “11.ii.68 \ J. S. Dugdale ”; 4 exx. (NZAC): “ Mt. Rakeahua \ 1000’- 2000’”, “10.ii.68 \ G. Kuschel ”, “ Stewart I. \ Exp. Feb. 1968 ”; 1 ex. (NZAC): “ Mt. Rakeahua \ Stewart I 2000 ’”, “14.ii.68 \ G. Kuschel ”, “Stewart I. \ Exp. Feb. 1968 ”; 1 ex. (LUNZ): “ NEW ZEALAND, SI \ STEWART ISLAND \ Mt. Rakeahua \ 7.II.1991 \ R. R. Scott ”, “ swept from Blechnum \ discolor”; 4 exx. (LUNZ): “ NEW ZEALAND, SI \ STEWART ISLAND \ Christmas Village \ 6-7.ii.1991 \ J.W. Early ”, “swept in podocarp/ \ hardwood forest”; 1 ex. (LUNZ): “ Swept near hut \ Freshwater Creek Area \ Stewart Island, N. Z. \ 20.II.1970 \ Ento. Dept. Field Trip”; 1 male (AMNZ): “ Haldane \ Southland \ 24-I-47 C.E.C. [on the underside of the cardboard with the beetle]”, “Stewart I. \ Exp. Feb.1968 ”, “ C.E. Clarke \ Collection”; 5 exx. (NZAC): “ Port William \ Stewart I \ 7 Feb 69 \ A. C. Eyles ”, “Stewart I. \ Exp. Feb. 1968 ”; 2 females (NZAC): “Port \ William \ Stewart I”, “4Feb69 \ B.A. Holloway ”, “General \ Beating”; 1 male (NZAC): “ Port William \ Stewart I \ 7 Feb 69 \ A.C. Eyles ”; 1 female (NZAC): “ Port William \ Stewart I. \ 7Feb 69. \ B.A. Holloway ”, “General \ beating”; 2 females (NZAC): “ Collector \ Jan.1943. \ A.E. Brookes ”, “Stewart \ Island.N.Z.”, “ A.E.Brookes \ Collection”; 1 ex. (LUNZ): “ NEW ZEALAND, SI \ STEWART ISLAND \ Table Hill track \ 8.II.1991 S. P., Womer \ under logs”; 1 ex. (NZAC): “ Table Hill \ 1000’ 16.ii.68”, “ Stewart I. \ Exp. Feb. 1968 ”, “Beating”; 2 males (AMNZ): “ Table Hill \ Stewart Is. \ 6-2-47 \ C.E. Clarke [on the underside of the cardboard with the beetle]”, “ C. E. Clarke \ Collection”; 1 female (NZAC): “ Big S. Cape I \ (NE) Feb 69 \ SW Stewart I \ B.A. Holloway ”, “General \ Beating”; 1 ex. (NZAC): “Paterson \ Inlet”, “Little Glory \ Bay”, “Stewart I. \ 6 Feb 69 \ B.A. Holloway ”; 1 ex. (NZAC): “Tisbury \ 9 / 10 / 10”; 1 ex. (NZAC): “ Wallacetown \ 18.II.09”; 10 exx. (NZAC): “ Sealers Bay \ Codfish Is.”, “12.xii.66 \ J.I. Townsend ”, “ Weinmannia \ flowers”; 1 female (NZAC): “ Sealers Bay \ Codfish Is.”, “15.xii.66 \ J.I. Townsend ”; 1 male (NZAC): “ NEW ZEALAND SI \ Stewart I \ Codfish I \ Sealers Bay \ Loop Track ”, “ 7 Dec 1981 \ B.A. Holloway \ Litter 81/209”; 2 males (NZAC): “ NEW ZEALAND SI \ Stewart I \ Codfish I \ Summit Tk, 250m \ 28 Nov 1981 ”, “ B.A. Holloway \ on Gahnia”; 1 male (NZAC): “ NEW ZEALAND SI \ Stewart I \ Codfish I \ Valley Track \ 24-30 Nov 1981 ”, “ B.A. Holloway \ on Gahnia”; 1 male (NZAC): “ NEW ZEALAND SI \ Stewart I \ Codfish I \ Summit Tk, c 250m \ 30 Nov 1981 ”, “ B.A. Holloway \ Sifted litter \ 81/199”; 1 female, 1 male (NZAC): “ Mt. Summit \ Codfish Isl. ”, “11.xii.66 \ J.I. Townsend ”, “On ferns \ at night”; 1 female (NZAC): “ NEW ZEALAND SI \ Stewart I \ Little River \ West side \ 4-9 Jan 1976 ”, “ A.C. Harris \ Malaise trap ”; 2 males (NZAC): “ NEW ZEALAND SI \ Stewart I, W side \ Little River \ 26 Dec 1975 - \ 2 Jan 1976 ”, “ A.C. Harris \ Malaise trap ”; 1 female (NZAC): “ NEW ZEALAND SI \ Harry West Bay \ 24 Jan 2007 R.Leschen \ T Buckley K. Marske \ ex lichens”, “RL1208 \ 46 55.917S \ 168 1.032E ”; 1 female (NZAC): “Paterson \ Inlet”, “Little Glory \ Bay”, “Stewart I. \ 6Feb69 \ B.A. Kuschel ”; 1 female (NZAC): “ Pegasus \ 23.ii.68 \ G. Kuschel. \ Ex. soil.”, “ Stewart I. \ Exp. Feb.1968 ”; 1 female (NZAC): “ Pegasus Ck. \ 24.ii.68 \ G. Kuschel ”, “ Stewart I. \ Exp. Feb.1968 ”, “litter”; 1 female (NZAC): “ Twilight Bay \ Port Pegasus ”, “22.ii.68 \ G. Kuschel ”, “ Stewart I. \ Exp. Feb.1968 ”, “moss”; 2 males (NZAC): “ New Zealand SI \ Golden Bay \ Stewart Island \ 10-Jan-96”, “Ex John Nunn \ Collection \ Donated 2015”; 2 males (NZAC): “ New Zealand SI \ Halfmoon Bay \ Stewart Island \ 11-Jan-96”, “Ex John Nunn \ Collection \ Donated 2015”; 3 males (NZAC): “ NEW ZEALAND SL \ Slopedown, 580m \ Mokoreta No 2 \ 23 Nov- \ 12 Dec 1985 ”, “ B.I.P.Barratt \ Pit trap in \ shrubland”, “ Duplicate \ specimens \ in alcohol”; 4 exx. (NMPC): “ NEW ZEALAND: Stewart Island 0.65 \ km NNW of Fred’s Camp Hut \ 46°55.51’E 167°58.32’E; 70 m \ 18-22.i.2016; Seidel, Sýkora & \ Fikáček lgt. 2016-NZ010”, “ flight intercept trap in sparse \ hardwood-podocarp forest \ numerous ferns in understory”; 2 exx. (NMPC): “ NEW ZEALAND: Stewart Island 0.5 \ km N of Fred’s Camp Hut \ 46°55.54’E 167°58.49’E; 30 m \ 18-22.i.2016; Seidel, Sýkora & \ Fikáček lgt. 2016-NZ009”, “ flight intercept trap in mossy \ hardwood forest with numerous \ fallen/decaying trunks”; 26 exx. (NMPC): “ NEW ZEALAND: Stewart Island \ end of Fern Gully Tk. W of Oban, \ 17.-21.i.2016; 46°53.34’S \ 168°5.51’E; 65m; Seidel, Sýkora \ & Fikáček lgt. 2016-NZ005”, “ baited pitfall traps (rotten squid) in \ dense young forest with numerous \ ferns in understory”; 1 ex. (NMPC): “ NEW ZEALAND: Steward Island \ Northwest Circuit Tk. 3.2 km W of \ Oban, 17.-21.i.2016; \ 46°53.80’S; 168°5.18’E; 95 m \ Seidel & Fikáček lgt. 2016-NZ006”, “sifting of leaf litter in hardwood- \ podocarp forest with sparse ferns \ and many mosses”.
Diagnosis. Body of moderate size (TL 3.8–4.6 mm), setation short, adherent, punctation of pronotum not granulate, females apterous. Male genitalia with wide, rounded apical portion of trigonium. Tergite VII in females with oval depression; this structure is unknown in any other Atopida species. Bursal sclerite with paired rod-like sclerites and additional small sclerite between the rods. A. suffusa is the only species with similar aedeagus and bursal sclerite but its dorsum is covered with long, erect setae.
Redescription. Male. Body elongated, moderately large (TL 3.9–4.6 mm), convex. Body yellowish-brown to dark brown. Punctation on head subtly granulate, punctures touching each other, on pronotum not granulate in central portion of the disc, sometimes granulate on sides, but granules flat and sparse, punctures separated by 0.3– 1.0× diameter of a puncture, punctation on elytra simple, punctures separated by 0.5–0.7× diameter of a puncture. Body covered with very short, yellowish, strongly adherent setae. Supraantennal ridges well-marked, slightly elevated. Pronotum widest slightly before middle of its length, sides curved, anterolateral angles slightly produced, posterolateral angles obtuse, rounded. Elytra in some specimens with two faint longitudinal carinae, humeri wellmarked. Ventrite 5 rounded, apex truncate. Penis elongate (L 0.59 mm, W 0.25 mm), with very wide trigonium, rounded in apical portion, a little shorter than parameroids, covered with very short setae; parameroids widely triangular, axe-shaped, apices rounded, apical part covered with punctures; pala triangular, slightly longer than parameroids. Tegmen (L 0.57 mm, W 0.39 mm) relatively wide, with triangular parameres, covered with numerous minute setae in apical portion.
Female. Body medium sized (TL 3.8–4.4 mm). Supraantennal ridges well-marked, only slightly elevated. Punctation on disc of pronotum sparser than in males, punctation on elytra coarser, punctures separated by 0.5× diameter of a puncture. Ventrite 5 rounded, with deep, semicircular emargination at apex, tergite VII with oval depression (Fig. 8D) in apical portion. Ventrite 4 with two large, oblique setal patches. Bursal sclerite consisting of two lateral rods (L 0.40 mm) widened in posterior portion and armed with denticles on outer parts of anterior portion, additional small, v-shaped sclerite present between rods.
Measurements and ratios. Males (n = 10) TL 3.85–4.60 mm (4.10 mm), PL 0.70–0.85 mm (0.74 mm), PW 1.10–1.35 mm (1.23 mm), EL 3.10–3.70 mm (3.35 mm), EW 1.75–2.15 mm (1.93 mm), TL/EW 2.02–2.23 (2.13), PW/PL 1.53–1.79 (1.66), EL/EW 1.64–1.82 (1.73), EL/PL 4.31–4.93 (4.53), EW/PW 1.52–1.68 (1.57). Females (n = 10) TL 3.80–4.35 mm (4.06 mm), PL 0.70–0.85 mm (0.76 mm), PW 1.35–1.50 mm (1.42 mm), EL 3.15–3.55 mm (3.30 mm), EW 1.85–2.15 mm (2.02 mm), TL/EW 1.88–2.08 (2.01), PW/PL 1.71–2.00 (1.87), EL/EW 1.56–1.71 (1.64), EL/PL 3.94–4.73 (4.34), EW/PW 1.37–1.52 (1.42).
Distribution. Very common in southern part of South Island, especially on Stewart Island, present also in Southland area (Fig. 18C).
Remarks. The species is very distinct in terms of morphology, and we agree with Broun’s (1914) conclusion that “there is no similar species”.
description: Published as part of Kiałka, Agata & Ruta, Rafał, 2022, Revision of Atopida White, 1846 (Coleoptera: Scirtoidea: Scirtidae), pp. 401-443 in Zootaxa 5174 (4) on pages 417-419, DOI: 10.11646/zootaxa.5174.4.6, http://zenodo.org/record/6986469