Chromatomyia gentianae Hendel

Guglya, Yuliia, 2021, Rearing mining flies (Diptera: Agromyzidae) from host plants as an instrument for associating females with males, with the description of seven new species, Zootaxa 5014 (1), pp. 1-158 : 42-44

Chromatomyia gentianae Hendel

( Figs. 116–121 , 450–454 )

Material examined: Ukraine: Transcarpathia: near Kvasy, Menchul Mt. , 1200 m a. s. l., 48°09’N, 24°20’E, 20– 21.viii.2019, Yu. Guglya, ex Gentiana asclepiadella (9♂ 4♀) ; the Chornohory Mountain Massif, Petros Mt. , 1720 m a. s. l., 48°09’N, 24°24’E, 8.ix.2018, Yu. Guglya, ex Gentiana asclepiadella (1♀) ; the Chornohory Mountain Massif, foothills of Petros Mt. , 1505 m a. s. l., 48°08’N, 24°24’E, 26.viii.2019, 7.ix.2019, Yu. Guglya, ex Gentiana asclepiadella (2♂ 1♀) ; the Chornohory Mountain Massif, “Peremychka”, 1605 m a. s. l., 48°09’N, 24°29’E, 23, 28.viii.2019, Yu. Guglya, ex Gentiana asclepiadella (1♂ 2♀) ; 13 km SE Luhy , 1140 m a. s. l., 48°03’N, 24°34’E, 26.viii.2019, Yu. Guglya, ex Gentiana asclepiadella (1♂) ; the Chornohory Mountain Massif, foothills of Pip Ivan Mt. , 1810 m a. s. l., 48°03’N, 24°37’E, 27, 30.viii.2019, Yu. Guglya, ex Gentiana lutea (2♂ 1♀) .

Hosts. Gentianaceae : Gentiana spp. ( Benavent-Corai et al. 2005).

Mine. ( Fig. 116–118 ) The solitary larva forms a white star upper surface mine. Normally, several larvae live in one leaf and their mines eventually coalesce, spreading over much of the leaf ( Fig. 278 ).

Puparium. ( Figs. 119–121 ) Colourless, translucent, with dark orange anterior and posterior spiracles, 3.0 mm long, with shallow segmentation; surface quite smooth except for wide bands of minute spines. Posterior spiracles set on short, stout, conical protuberances and entirely separate; with twelve sessile bulbs set arranged in an elongated group. Anal plate strongly protruding above the surface of the puparium viewed from the side and directed posteriorly.

Cephalopharyngeal skeleton. ( Fig. 450 ) Right mouthhook much larger than the left, each with sharp abducted portion directed ventro-anteriorly and bearing two accessory teeth. Intermediate sclerite massive, 1.27× as long as maximum height of left mouthhook. The mouthhook and the intermediate sclerite ventro-anteriorly are strongly sclerotized; the intermediate sclerite dorsally and posteriorly and the anterior portion of the pharyngeal sclerite are much less so. The dorsal and ventral cornua are very weakly sclerotized. The ventral cornu bears an oval “closed” window located centrally. Indentation index 82. See also in Sasakawa (1961: Fig. 125 l ).

Female head. ( Figs. 451, 452 ) Brown, with antenna, oc tr and postgena black and proboscis yellowish; orbit not projecting above eye in profile; 2 orb s, 1 fr s; lunule broad, semicircular, reaching the level of fr s; pped large, rounded; gena medially 0.3× as high as maximum height of eye.

Female genitalia. ( Figs. 453, 454 ) Capsule of spermatheca relatively very small, 0.07× as high as height of anterior part of oviscape. Spermathecae equal in size, dark brown, spherical. Spermathecal duct weakly sclerotized. Ventral receptacle S-shaped, with well sclerotized tail. Body of receptacle spherical with sharply curved basal connecting tube, strongly sclerotized, 2.62× as wide as capsule of spermatheca; with opening located on torus-shaped projection, as wide as diameter of spherical part of body. Proctiger see in Sasakawa (1961: Fig. 125 h ).

Distribution. Common in mountains of Europe, also present in Japan ( Spencer 1990). Ukraine (first record).

Comments. In the Ukrainian Carpathian Mountains this species is abundant, and very often infests most of the available host plants. So far in Ukraine it has been found only on G. asclepiadella and G. lutea .

Figures

FIGURES 112–121. Figures 112–115: Nemorimyza posticata (Meigen); 112: mines in Solidago canadensis leaf; 113: puparium viewed from the side; 114: posterior segments of puparium (posterior view); 115: posterior spiracles (posterior view). Figures 116–121: Chromatomyia gentianae Hering; 116–118: mines; 116–117: in Gentiana asclepiadella leaf; 118: in G. lutea leaf; 119: empty puparium viewed from the side; 120: posterior segments of puparium (posterior view); 121: posterior spiracles (posterior view).

FIGURES 450–454. Chromatomyia gentianae Hering; 450: cephalopharyngeal skeleton; 451: frontal view of head; 452: head viewed from the side; 453: oviscape, ventral receptacle and spermatheca proportionally; 454 a–b: spermatheca and ventral receptacle proportionally; a: spermatheca; b: ventral receptacle.

FIGURES 278–286. Figures 278–283: Phytomyza veronicicola Hering; 278–280: mine in Veronica longifolia leaf; 278: viewed from upper leaf surface; 279: viewed from lower leaf surface; 280: “pupal blister” with puparium. 281: empty puparium viewed from the side; 282: posterior segments of puparium (posterior view); 283: posterior spiracles (posterior view). Figures 284–286: Phytoliriomyza melampyga (Loew); 284: mines in Impatiens parviflora leaf; 285–286: posterior segments of puparium; 285: lateral view; 286: posterior view.

FIGURES 122–129. Figures 122–126: Chromatomyia horticola (Goureau); 122–123: mines with puparia (indicated by arrows) in Ononis arvensis leaf; 122: viewed from upper leaf surface; 123: viewed from lower leaf surface, with puparia indicated by arrows; 124: empty puparium viewed from the side; 125: posterior segments of puparium (posterior view); 126: posterior spiracles (posterior view). Figures 127–129: Ch. periclymeni (Hendel); 127: mine in Lonicera sp. leaf (photo by A. Gubin); 128–129: posterior segments of puparium; 128: lateral view; 129: posterior view.