Anthomyza tschirnhausi, Rohacek, 2009

Roháćek, Jindřich & Barber, Kevin N., 2016, Nearctic Anthomyzidae: a monograph of Anthomyza and allied genera (Diptera), Acta Entomologica Musei Nationalis Pragae (suppl.) 56, pp. 1-412 : 278-279

Key to identincation of the Nearctic species of the Anthomyza tschirnhausi group

1 Male. ........................................................................................................................... 2

– Female. ........................................................................................................................ 3

2(1) Gonostylus (in widest extension view, Figs 466 , 473 , 508, 509 ) with anterior margin distinctly convex. Thorax less densely grey to greyish brown microtomentose ( Fig. 481 ) and with mesonotum usually subshining anteriorly. ............ A. shewelli sp. nov.

– Gonostylus (in widest extension view, Figs 493 , 510–512 ) with anterior margin concave to almost straight. Thorax with dense grey microtomentum ( Fig. 483 ), often with some bluish tinge (including mesonotum anteriorly). ............. A. gilviventris sp. nov.

3(1) T7+S7 entirely orange yellow to pale orange brown, sometimes with only a very narrow diffuse darkening on posterior margin and small brown marks on anterolateral lobes, OR only dorsolaterally narrowly brownish-darkened at posterior margin and ventrally with distinct and contrasting dark brown anterolateral lobes ( Figs 484 , 496 , 517). ........................................................................... A. gilviventris sp. nov. (in part)

– T7+S7 dorsolaterally with at least posterior quarter ( Figs 458 , 474 ), largely ( Fig. 515 ) to entirely ( Figs 482 , 502 ) dark brown, never as above. ............................................ 4

4(3) Spermathecae relatively large, the larger one 0.9–1.2 times as long as medial length of S10, usually more elongately ovoid and with sparsely striated surface ( Figs 479, 480 ). T7+S7 with microtomentose area below 7th spiracle unpigmented, narrowly depressed and usually separated from dorsal darker part by a more or less distinct lateral ridge (Fig. 516). Thorax usually less densely grey to greyish brown microtomentose (as in Fig. 481 ) and with mesonotum usually subshining anteriorly ( Figs 2 , 458 ). ................ ...................................................................................................... A. shewelli sp. nov.

– Spermathecae relatively small, 0.6–0.8 times as long as medial length of S10, usually more broadly ovoid and with more densely striated surface ( Figs 494, 498 , 501, 505 , 514 ). T7+S7 with microtomentose area below 7th spiracle pale- to dark-pigmented, nat, usually without lateral ridge (Fig. 517). Thorax with dense grey (often with some bluish tinge) microtomentum and, including mesonotum anteriorly, almost dull ( Figs 482, 484 ). ................................................................... A. gilviventris sp. nov. (in part)

Figures

Figs 460–466. Anthomyza shewelli sp. nov., paratype male, typical form (Canada: Ontario). 460 – external genitalia, caudally; 461 – apex of nlum, subventrally; 462 – external genitalia, laterally; 463 – hypandrial complex, laterally; 464 – transandrium, caudally; 465 – aedeagal complex, laterally; 466 – gonostylus, ventrolaterocaudally (widest extension). Scales = 0.05 mm (Figs 461, 466) and 0.1 mm (others).

Figs 467–473. Anthomyza shewelli sp. nov., paratype male, darkest form (USA: Idaho). 467 – external genitalia, caudally; 468 – apex of nlum, subventrally; 469 – external genitalia, laterally; 470 – hypandrial complex, laterally; 471 – transandrium, caudally; 472 – aedeagal complex, laterally; 473 – gonostylus, ventrolaterocaudally (widest extension). Scales = 0.05 mm (Figs 468, 473) and 0.1 mm (others).

Figs 508–515. Gonostyli (Figs 508–512) of paratypes ventrolaterocaudally (in widest extension) and female postabdominal structures (Figs 513–515) of the Nearctic species of the Anthomyza tschirnhausi group. 508 – A. shewelli sp. nov.(Canada:Ontario); 509 – same species (USA:Montana); 510 – A.gilviventris sp.nov.(Canada:British Columbia); 511, 512 – same species (USA: Colorado); 513 – A. gilviventris sp.nov., paratype female,dark form (USA:Colorado), 8th abdominal segment with internal sclerites, laterally; 514 – same specimen, spermatheca; 515 – same specimen, 7th and 8th abdominal segments, dorsally. Scales = 0.1 mm (Fig. 513), 0.2 mm (Fig. 515) and 0.05 mm (others).

Figs 481–484. Primary types and females of the Nearctic species of the Anthomyza tschirnhausi group. 481 – A. shewelli sp. nov., holotype male, laterally, body length 2.30 mm; 482 – A. gilviventris sp. nov., dark form, paratype female, laterally, body length 3.42 mm (USA: Colorado); 483 – A.gilviventris sp. nov., holotype male, laterally, body length 2.89 mm; 484 – same species, topotypic paratype female, laterally, body length 3.57 mm. Photo by J. Roháček.

Figs 487–493. Anthomyza gilviventris sp. nov., paratype male (Canada: Ontario). 487 – external genitalia, caudally; 488 – apex of nlum, subventrally; 489 – external genitalia, laterally; 490 – hypandrial complex, laterally; 491 – transandrium, caudally; 492 – aedeagal complex, laterally; 493 – gonostylus, ventrolaterocaudally (widest extension). Scales = 0.05 mm (Fig. 488) and 0.1 mm (others).

Figs 494–500.Anthomyza gilviventris sp. nov., paratype female (Canada:Ontario). 494 – spermatheca; 495 – postabdomen, dorsally; 496 – the same, ventrally; 497 – distal part of female genital chamber, laterally; 498 – spermatheca; 499 – end of postabdomen with internal sclerites, laterally; 500 – internal sclerites and S8, ventrally. Scales = 0.05 mm (Figs 494, 498), 0.2 mm (Figs 495, 496) and 0.1 mm (others).

Figs 456–459. Anthomyza shewelli sp. nov. and its habitat. 456 – A. shewelli sp. nov. in copula on Equisetum stem, body length ca. 2.4 mm and 3.1 mm; 457 – same, male laterally, body length ca. 2.5 mm (Canada: Ontario: Pancake Bay Prov. Park); 458 – female on leaf of Carex, body length ca. 3.2 mm (Ontario: Dubreuilville env.); 459 – marshy riverbank of Mississagi River (Canada: Ontario) with predominant Carex and Equisetum, habitat of A. shewelli in the type locality. Photo by K. N. Barber (Fig. 459) and J. Roháček (others).

Figs 474–480. Anthomyza shewelli sp. nov., paratype female, typical form (Canada: Ontario). 474 – postabdomen, dorsally; 475 – the same, ventrally; 476 – distal part of female genital chamber, laterally; 477 – end of postabdomen with internal sclerites, laterally; 478 – internal sclerites and S8, ventrally (micropubescence omitted); 479 – spermathecae; 480 – spermatheca of another specimen. Scales = 0.2 mm (Figs 474, 475), 0.1 mm (Figs 476–478) and 0.05 mm (Figs 479, 480).

Figs 501–507. Anthomyza gilviventris sp. nov., dark form, paratype female (USA: Montana). 501 – spermatheca; 502 – postabdomen, dorsally; 503 – the same, ventrally; 504 – distal part of female genital chamber, laterally; 505 – spermatheca; 506 – end of postabdomen with internal sclerites, laterally; 507 – internal sclerites and S8, ventrally (micropubescence omitted). Scales = 0.05 mm (Figs 501, 505), 0.2 mm (Figs 502, 503) and 0.1 mm (others).

Figs 2–3. Nearctic species of the genus Anthomyza. 2 – A. shewelli sp. nov., a pair (male on left) on leaf of Carex sp. (Canada:Ontario:Dubreuilville, Magpie River), body length ca.2.4 mm (male) and 3.1 mm (female); 3 –A.mcalpinei sp. nov., living male, laterally (Canada:Ontario:Sault Ste. Marie, Finn Hill), body length ca.2.8 mm. Photo by J. Roháček.