Strobilotia Gagné, 2013

Gagné, Raymond J., 2013, Four new genera of Nearctic Cecidomyiidae (Diptera) for species previously incorrectly placed, Zootaxa 3701 (2), pp. 148-158 : 153-155

Strobilotia Gagné , new genus

Figs. 11–15

Diagnosis. Adults of Strobilotia can be separated from all other genera of the supertribe by the following combination of characters: C broken immediately posterior to junction with R5; R5 reaching C slightly anterior to wing apex; empodia much longer than tarsal claws; tarsal claws without basal tooth; second through seventh abdominal tergites of both sexes with posterior row of setae discontinuous in middle and lateral setae; gonocoxal mediobasal lobe divided into dorsal and ventral lobes, the ventral lobe longer and blunt apically; and gonostylus short, stubby, glabrous and ridged dorsally, setulose ventrally, barely tapering to long apical tooth; female eighth abdominal tergite 3 times length of seventh, divided on anterior third; ovipositor elongate-protrusible, bare dorsally, with scattered setae ventrally and wide, lateral, lightly pigmented sclerite along length of ninth segment subdivided by closely placed, oblique, parallel lines; cerci fused, with scattered setae, none thickened and blunt-tipped. Third instar without spatula.

Description. Adult. Head: Eye facets circular, contiguous on ventral half of eye, farther apart dorsally, eye bridge 3–4 facets long. Antenna: scape with a few setae laterally and scales medially; pedicel with ventral scales; 14–15 flagellomeres; all but last flagellomere with long necks in male, about one-third length of node, without necks in female. Frons with many setae and scales. Labella large, blunt in frontal view, with many stout setae. Palpus 4- segmented, segments about 2 times as long as broad.

Thorax: Scutum with 4 longitudinal rows of setae mixed with some scales, the 2 dorsocentral rows several setae wide anteriorly, narrowing to one seta wide before vanishing shortly before scutellum, the 2 lateral rows 2–3 setae wide mixed with some scales and continuous along length of sclerite. Scutellum with many setae and scales laterally. Anepisternum with several scales dorsally; anepimeron setose; pleura otherwise bare. Wing: C broken beyond junction with R5; R5 reaching C slightly anterior to wing apex; M not apparent; CuA forked. Acropod (as in Fig. 6 ): claws without basal tooth; empodia appreciably longer than claws; pulvilli about half as long as claws.

Male abdomen: First through seventh tergites rectangular, with anterior pair of trichoid sensilla, mostly single row of setae along lateral third of posterior margin, second to seventh tergites with several lateral setae, with scattered scales elsewhere, eighth tergite unpigmented posteriorly, with anterior pair of trichoid sensilla, several lateral setae and few to no scales elsewhere. Second through seventh sternites rectangular, with mostly single horizontal row of posterior setae, the rows of setae mixed with scales, anterior half completely covered with setae and scales, and pair of closely approximated trichoid sensilla anteriorly. Terminalia ( Figs. 14–15 ): cercus ellipsoid, with a few setae apically and laterally; hypoproct parallel-sided, deeply concave, resulting lobes with 4–5 apical and subapical setae on each, otherwise evenly setulose on both surfaces; gonocoxite cylindrical laterally, its mediobasal lobe subdivided into a short dorsal lobe and a longer, blunt-tipped ventral lobe closely abutting and shorter than aedeagus, both lobes longsetulose except ventral lobe glabrous ventroapically with several setae on raised bases; gonostylus short, stubby, barely tapering to wide apical tooth, glabrous and ridged dorsally, setulose on venter; aedeagus longer than gonocoxal lobes, rounded apically.

Female abdomen ( Figs. 11–13 ): First through sixth tergites as in male; seventh tergite much narrower and only slightly longer than sixth, trapezoidal, broadest anteriorly, with a few short setae posteriorly and pair of trichoid sensilla anteriorly; pair of pseudosclerites posteriad of seventh tergite not present; eighth tergite 3 times as long as seventh, longitudinally divided into two narrow sclerites, each with trichoid sensilla anteriorly and several short setae posteriorly. Second to sixth sternites as for male, the seventh much narrower than sixth, with 2 rows of posterior setae, scattered setae at midlength and pair of closely spaced trichoid sensilla anteriorly. Ovipositor elongate, protrusible, bare dorsally, with scattered setae ventrally, and wide, lightly pigmented dorsolateral sclerite along length of ninth segment subdivided by closely placed, oblique, parallel lines; fused cerci, cylindrical, covered with many, equally long setae, none thickened and blunt-tipped; hypoproct tapered to apex, with 2 distal setae.

Larva. Third instar: Ovoid. Integument verrucose. Head short, hemispherical, cephalic apodemes as long as head capsule, antennae less than twice as long as wide. Spatula absent. Papillae with very short setae. Lateral papillae in two groups of three on each side of midline. Terminal papillae 8.

Type species, Phytophaga carpophaga Tripp.

Material examined (all taken from seeds of Picea glauca (Moench) Voss. (Pinaceae) . Paratypes of Phytophaga carpophaga , ♂ and ♀, Dunrobin, Ontario, Canada, V-7-1953, H.A. Tripp; 2 ♂, 2 ♀, Beaver Pass, British Columbia, Canada, VII-29-1969, A.F. Hedlin; 2 ♂, 3 larvae, nr. Cantwell, Alaska, USA, 1998, J. Roland; ♂, Dixhills, New York, USA, I-5-1979, P.M. Grosser. All specimens are in the National Museum of Natural History, Smithsonian Institution, Washington, DC.

Etymology. The name Strobilotia combines strobilos, Greek for pine cone, with the suffix “tia that indicates the site association of the included species. The gender is feminine.

Remarks. This new genus includes for now only Strobilotia carpophaga (Tripp 1955) , new combination, whose larva lives in seeds of Picea glauca (Moench) Voss. (Pinaceae) . See remarks for Cembrotia above for separation of the three new genera described here.

Figures

FIGURES 11 – 15. Strobilotia carpophaga. 11 – 13, Female postabdomen: 11, posterior end of sixth segment to fused cerci (dorsolateral), 12, fused cerci and hypoproct, detail (lateral), 13, posterior end of sixth segment through seventh segment (dorsolateral). 14 – 15, Male terminalia: 14, only one gonopod shown and cerci and hypoproct removed (dorsal), 15, cerci and hypoproct (dorsal).

FIGURES 6 – 10. Cupressatia siskiyou. 6, Acropod. 7 – 8, Male terminalia: 7, only one gonopod shown (dorsal), 8, aedeagus with gonocoxal mediobasal lobes (dorsal). 9 – 10, Female postabdomen: 9, posterior end of sixth segment to fused cerci (dorsolateral), 10, fused cerci and hypoproct, detail (lateral).