Amiota lineiventris Máca, 2003

Jones, Lance E. & Grimaldi, David A., 2022, Revision Of The Nearctic Species Of The Genus Amiota Loew (Diptera: Drosophilidae), Bulletin of the American Museum of Natural History 2022 (458), pp. 1-181 : 31-32

Amiota lineiventris Máca, 2003

Figures 10A–B , 11D–E , 14 , 82B

Amiota lineiventris Máca, 2003: 267 (original description); Brake and Bächli, 2008: 253 (world catalog).

DIAGNOSIS: Small to medium-sized fly (ThL 1.04–1.26 mm), dark brown; male sternites 7 and 8 with Y- and I-shaped apodemes, respectively; male genitalia distinctively simple: outer paraphyses a pair of small, ovoid lobes with narrow posterodorsal extension, several stiff, preapical setulae; inner paraphyses heavily sclerotized, simple, with distal and proximal ends a pair of short lobes, fused medially.

DESCRIPTION: Small to medium-sized fly (ThL 1.04–1.26 mm), dark brown, legs yellow. Frons dark, slightly pollinose in ventrolateral corners and surround ocellar triangle, with several scattered hairs. Facial marking narrow (FML/FMW 0.22–0.27). Cheek depth highly variable (EL/CW 12.50–25.50), yellowish gray. Palp yellow. Male sternites 7 and 8 distinctive, with sclerotized apodemes: Y-shaped in sternite 7 (area between arms concave), roughly I-shaped in sternite 8. Arista: Medium plumose; longest branch D1; A.R. 0.46; 3 long dorsal, 2–3 shorter ventral branches; branch D4 pointed laterad; arista trunk with short-medium microtrichia over entire length. Male genitalia: Epandrium very distinctive; split medially into distinct halves, widely separated; with row of setae ringing the circumference. Cercus large and semicircular, protruding greatly (not recessed into epandrium); occupying most of space surrounded by epandrium. Surstylus roughly square, with 9 prensisetae of equal size, apices blunt, comblike, ventral half and margin with scattered setulae. Subepandrial sclerite simple; subepandrial appendage small, ventral to epandrium (not protruding), lightly sclerotized and membranous, apex deeply notched. Outer paraphysis ovoid, with small lobelike extension on posterodorsal end; middle region laterally with ca. 9 short scattered sensilla; distally with 2–3 long setulae, 3× length of the sensilla. Inner paraphysis heavily sclerotized, with distal and proximal ends a pair of short lobes, apparently fused in middle. Aedeagal apodeme moderately sclerotized; bent nearly 45° at midpoint in lateral view, longer than wide; base and midpoint bulging, lightly sclerotized; distal end flared, deeply notched and concave, lateral arms most heavily sclerotized. Hypandrium simple, sclerotized, thickness consistent along length, apex bent inward. Ejaculatory apodeme 0.5× length of epandrium. Head and thorax measurements: (n = 5; Am 499, 592, 749, 1189, 1250) FL/FW 0.73 (0.68–0.76), EL/EW 1.21 (1.16–1.26), EL/CW 18.17 (12.50–25.50), FML/ FMW 0.25 (0.22–0.27), PR /RR 0.50 (0.36–0.62), ThL 1.16 (1.04–1.26 mm).

TYPE MATERIAL: Holotype: male: As reported by Máca (2003): “ ♂: Canada: Ontario: Eganville, damp meadow near lake, 2.6.1991, leg. M. Barták” [not examined]. Coll. J. Máca, to be deposited in National Museum of Prague, Czech Republic ( NMPC). Paratypes: “Same data,” 1♂ (Coll. J. Máca, intended for NMPC). “ Canada, Quebec: Lac Roddic, 16 km S Maniwaki, 23.6.1991 1♂, leg. M. Barták.” (Coll. J. Máca, intended for NMPC).

OTHER MATERIAL EXAMINED: Canada: Ontario: Algonquin Provincial Park, Swan Lake Station, Scott Lake Survey , 1994-07-01 through 1994- 07-10, [collector unknown], C1 shore malaise trap, 1♂ (Am 592*, DEBU) ; Ottawa , 1970-06-26, leg. J. R. Vockeroth, 1♂ (Am 1444*, CNC) ; 1990-05-27, leg. J. R. Vockeroth, Ex damp shaded ditch in Acer wood, 1♂ (Am 1252*, CNC) ; 1992-07-26, leg. J. R. Vockeroth, Damp second-growth Acer-Betula wood, 1♂ (Am 1250*, CNC) ; 1995-06-24, leg. J. R. Vockeroth, Damp second-growth Acer-Betula wood, 1♂ (Am 1244*, CNC) ; Smith’s Bay, Nr. Picton , 1970-07-01, leg. J.F. McAlpine, 2♂ (Am 1183*, 1189*, CNC) . Quebec: Old Chelsea, Summit King Mtn. , 1965-06- 20, leg. D.M. Wood, 1♂ (Am 1201*, CNC) . USA: North Carolina: Graham Co., Robbinsville , 1976- 06-09, leg. G.E. Bohart, 1♂ (Am 499*, EMUS) . Virginia: Giles Co., Cascade Falls , 2001-05-19, leg. O. Lonsdale, debu01007820, 1♂ (Am 749*, DEBU) .

DISTRIBUTION: The original description by Máca (2003) cited only specimens from Canada (Ontario and Quebec), but Amiota lineiventris is now known from one specimen each from North Carolina and Virginia, showing a much wider distribution.

COMMENTS: Amiota lineiventris is a rarely collected species, usually as an individual rather than a series. It is unknown whether this species is attracted to the eyes and face as in other Amiota .

Figures

FIG. 10. Heads and lateral views, A. alboguttata species group. A–B. A. lineiventris Máca (Am 499). C–D. A. steyskali Máca (Am 416).

FIG. 11. Aristae, A. alboguttata species group. A. A. communis Chen and Steyskal. B–C. A. durangoensis. D–E. A. lineiventris Máca. Not to same scale.

FIG. 14. Male terminalia, A. lineiventris Máca. A. Epandrium and cerci. B. Ejaculatory apodeme. C. Lateral view. D. Aedeagal apodeme. E. Outer paraphysis, lateral. F. Inner paraphysis (dark) and outer paraphyses, dorsal view. G. Surstyli and subepandrial sclerite. H. Male sternites 6 (above) and 5 (below). (Am 749).

FIG. 82. Distribution maps, A. alboguttata species group. A. A. durangoensis. B. A. lineiventris Máca. C. A. steyskali Máca.