Melanagromyza stemivora, Guglya, 2025
publication ID |
https://doi.org/10.11646/zootaxa.5658.1.1 |
publication LSID |
lsid:zoobank.org:pub:592F431A-58BF-459F-9527-68ADAAA351BB |
DOI |
https://doi.org/10.5281/zenodo.15822883 |
persistent identifier |
https://treatment.plazi.org/id/5135879C-BF14-2619-FF7B-FCCA5F29342A |
treatment provided by |
Plazi |
scientific name |
Melanagromyza stemivora |
status |
sp. nov. |
Melanagromyza stemivora sp. nov.
( Figs. 11–12 View FIGURES 8–12 , 128–139 View FIGURES 128–134 View FIGURES 135–139 )
Material examined. Ukraine: Kharkiv Region: near Rubizhne , 50°10'N, 36°47'E, 2.v.2021 —stems with puparia collected, v.2022 —dead imago found, Yu. Guglya, ex Centaurea jacea (1♂ 2♀); near Petrivske, 49°10'N, 36°58'E, 28.iv.2018 —stems with puparia collected, summer 2022—dead imago found, Yu. Guglya, ex Centaurea jacea (1♂ 1♀) GoogleMaps .
Etymology. The name of the new species reflects the fact that the larva leaves as a spem borer.
Host. Asteraceae : Centaurea jacea L.
Mine. The larva forms bores in the pith of a stem. Pupation takes place within the stem.
Puparium. ( Figs. 11, 12 View FIGURES 8–12 ) Straw-coloured, silky-shining, 3.5 mm long, with scarcely visible segmentation; surface quite smooth, only posterior segment wrinkly. Posterior spiracles set flat on the body cuticle very close but not connected to each other; orange-brown, shining, oval, with median black spine curved dorsally. Eleven to fourteen linear bulbs surround the median spine. Anal plate not protruding above the surface of puparium viewed from the side and directed ventrally.
Cephalopharingeal skeleton. ( Fig. 131a–c View FIGURES 128–134 ) Left mouthhook larger dorsally than the right, both with ventro-anterior portion wide and flattened. Right mouthhook bears one strong dorsal accessory tooth, left bears two dorsal teeth 2× as ventral ones; all teeth uniformly curved ventrally. Both dental sclerites well developed, equal in size, long, narrow, 0.9× as high as left mouthhook. Mouthhooks, dental sclerites and anterior third of intermediate sclerite are strongly sclerotized, medial and posterior part of intermediate sclerite, dorsal cornua and ventral cornu much less so. Dorsal cornua and ventral cornu wide, with not differentiated “closed”windows. Indentation index 60.
Adult description. ( Figs. 128, 129 View FIGURES 128–134 ) Head blackish-brown. Fronto-orbital plate not visible lateraly; 3 ors, 2 ori; orbital setula in two rows, short, proclinate and reclinate together; fronto-orbital plate wide, slightly shining (frontal view); oc tr reaching the level of ors a, slightly shining; frons matt; parafacial narrow; lunule large, reaching the level between ori p and ors a, with distinct furrow; gena and parafacial together medially 0.17× as wide as maximum height of eye; gena and postgena slightly flattened ventrally; 1 st fl rounded, covered with short thick pale hairs (most visible from side). Upper third of the eye pubescent in male, only few hairs visible along upper eye margin in female.
Wing: ( Fig. 130 View FIGURES 128–134 ) Hyaline, with brown veins; costa reaching M 1; last section of CuA 1 0.6× as long as penultimate; calypter, margin and fringe dirty white. Wing length 3.0 mm.
Mesonotum: Black with yellowish-green undertone, shining viewed from above; scutellum of the same colour, more matt; 0+2 dc s, equal in length; acr s in 9 irregular rows at level of anterior dc s; halter blackish-brown; legs blackish-brown, shining.
Male genitalia. ( Figs. 135–139 View FIGURES 135–139 ) Distiphallus ovate, with dramatically narrowing anterior half, 0.6× as wide as its length; with deep, wide invagination between ventro-lateral tubule viewed from below. Mesophallus strongly widening proximally and slightly widening distally, rounded apically viewed from the side. Junction of mesophallus with distiphallus displaced medially. Mesophallus posteriorly located closely to the anterior arm of basiphallus. Basiphallus 0.5× as long as length of distiphallus, appears trapezoidal because of well sclerotized anterior crossbar; uniformly sclerotized viewed from below; triangular and more sclerotized posteriorly viewed from the side. Phallophorus bulbate viewed from the side. Ejaculatory apodeme elongate, 0.4× as wide as its length, with strongly asymmetrical blade; 1.15× as long as length of phallus. Epandrium typical for the genus. Hypandrium stout, sharp anteriorly viewed from below. Metepiphallus trapezoid, with wide rounded invagination viewed from below.
Female genitalia. ( Figs. 132–134 View FIGURES 128–134 ) Spermathecae relatively small, 0.15–0.18× as high as height of anterior part of oviscape. Blade of egg-guide relatively wide, 4.7× as long as maximum width, abducted and rounded apically, with medial membrane bearing about 30 medium and numerous small scales. Outer marginal denticles fine, scarcely visible, directed ventrally. Proctiger generally cylindrical, gradually expanding posteriorly. Cercus narrow, elongated, 0.25× as long as proctiger; patches of long and medium setae located apically and 2 strong setae internalaterally. Spermathecae unequal in size, brown, narrower than high and flattened basally. Internal duct invagination 0.65–0.70× as deep as height of spermatheca, tapering apically. Distinct lobed basal collar present. Spermathecal duct narrow, very weakly sclerotized. Ventral receptacle pale brown, flat S-shaped, 1.5× as long as height of spermatheca.
Distribution. Ukraine (Kharkiv Region).
Comments. Superficially the new species cannot be reliably distinguished from Melanagromyza dettmeri and M. oligophaga . Larvae of all three species feed within stems of Centaurea sp. and puparia are similar except for minute differences in the posterior spiracles. In new species the spiracles are distinctly separated, whereas in M. dettmeri and M. oligophaga they are almost adjoining ( Warrington 2024). The male genitalia, in comparison, are distinctly different: basiphallus in M. dettmeri and M. oligophaga is U-shaped because of the absence of a well sclerotized anterior crossbar; the shape of the distiphallus and mesophallus viewed from the side is similar in all three species, but distinctky different when viewed from below. ( Papp & Černý 2015: figs 99 D, E; 107 D, E).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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