Cupressatia Gagné, 2013

Gagné, Raymond J., 2013, Four new genera of Nearctic Cecidomyiidae (Diptera) for species previously incorrectly placed, Zootaxa 3701 (2), pp. 148-158 : 151-153

Cupressatia Gagné , new genus

Figs. 6–10

Diagnosis. Adults of Cupressatia 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 continuous across sclerite and lateral setae; gonocoxal mediobasal lobe prominently subdivided into dorsal and ventral lobes, the ventral lobe longer, tapered; gonostylus short, stubby, barely tapering to long apical tooth, glabrous and ridged dorsally, setulose ventrally; female eighth abdominal tergite barely longer than seventh, undivided; 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 with spatula.

Description. Adult. Head: Eye facets circular, contiguous on ventral half of eye, farther apart dorsally, eye bridge 3–4 facets long. Antenna: scape and pedicel with few setae ventrally and medially; 16–19 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, semicircular in frontal view, with many stout setae. Palpus 4-segmented, third and fourth segments narrower and much longer than second.

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 abundant setae and scales laterally. Anepisternum with 0–few 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 ( Fig. 6 ): claws without basal tooth; empodia appreciably longer than claws; pulvilli about 1/3 as long as claws.

Male abdomen: First through seventh tergites rectangular, with anterior pair of trichoid sensilla, mostly single row of setae along posterior margin but sparse mesally; second to seventh tergites additionally with several lateral setae, with scattered scales elsewhere, eighth tergite unpigmented posteriorly and medially, with anterior pair of trichoid sensilla, several lateral setae and few to no scales medially. Second through seventh sternites rectangular, with single horizontal row of posterior setae on second sternite progressively increasing to two full rows on eighth sternite, the rows of setae mixed with scales, 2–3 rows of setae mixed with scales in transverse group near midlength, and pair of closely adjacent trichoid sensilla anteriorly. Terminalia ( Figs. 7–8 ): cercus ellipsoid, with a few setae apically and laterally; hypoproct parallel-sided, deeply divided into two lobes, with short seta at apex of each, otherwise evenly setulose on both surfaces; gonocoxite short, cylindrical laterally, its mediobasal lobe subdivided into a short dorsal lobe and a longer ventral lobe closely abutting and nearly as long as aedeagus, both lobes long-setulose except ventral lobe glabrous ventroapically with several setae on raised bases; gonostylus short, stubby, barely tapering to broad apical tooth, glabrous and ridged dorsally, setulose on venter; aedeagus slightly longer than gonocoxal lobes, tapered apically.

Female abdomen: First through seventh tergites quadrate, narrowing gradually beyond fourth, fifth and sixth about 2 times as wide as long, first through sixth tergites with two anterior trichoid sensilla, single row of posterior setae, 1–3 lateral setae, and evenly distributed scales elsewhere; seventh tergite trapezoidal, with two rows of posterior setae and no laterals but with scales on posterior half; pair of pseudosclerites not apparent in available specimens; eighth tergite narrower and as long as seventh, undivided, with two trichoid sensilla anteriorly and several short setae posteriorly. Second to seventh sternites as for male; eighth sternite not apparent in available specimens. Ovipositor ( Figs. 9–10 ) 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; cerci fused, 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 present, clove-shaped. Papillae with very short setae; lateral papillae in two groups of three on each side of midline; 8 terminal papillae.

Type species, Janetiella siskiyou Felt.

Material examined. Cupressatia siskiyou (all from seeds of Chamaecyparis lawsoniana (A. Murray) Parl. ( Cupressaceae )): syntypes of Janetiella siskiyou , ♀ and larva, 1 mile N Siskiyou National Forest, along S fork Coquille River, Oregon, USA, I–10–1917, E.R. Sasscer; ♂, ♀, Siskiyou National Forest, Oregon, USA, III-28- 1919, C.H. Pearce; ♀, Woodinville, Washington, USA, VIII-1986; 2 ♂, 3 larvae, Versailles, France, III-1971, R. Coutin. 3 ♂, 2 ♀, 2 larvae, Italy, further locality unspecified, intercepted with cargo at Port of New York, New York, 1969; larva, Netherlands: further locality unspecified, intercepted with cargo, 1987, at Port of New York, New York; Minstead, near Lyndhurst, United Kingdom, IV-25-1964, C.R. Vardy. Cupressatia thujae (all from cones of Thuja plicata Donn ex D. Don. ( Cupressaceae )): paratypes of Phytophaga thujae , 3 ♂ and 3 ♀, Langford, British Columbia, Canada, I-23-1958, A.F. Hedlin; 4 larvae, Verlot, Snohomish Co., Washington, USA. All specimens are in the National Museum of Natural History, Smithsonian Institution, Washington, DC.

Etymology. The name Cupressatia combines Cupressaceae , the name of the family to which the known hosts belong, but shortened here to “Cupressa, with the suffix “tia to indicate the host association of the included species. The gender is feminine.

Remarks. This new genus includes two described species, Cupressatia siskiyou (Felt 1917) , new combination, and Cupressatia thujae (Hedlin 1959) , new combination, both found in seeds in cones of Cupressaceae , both originating from the West Coast of North America. The first is from Chamaecyparis lawsoniana (A. Murray) Parl. , the second from Thuja plicata Donn ex D. Don. Cupressatia siskiyou occurs also in Europe where it was accidentally introduced with its host some time before 1931. Specimens from Netherlands were described as Craneiobia lawsoniana by Meijere (1935). It is now well established elsewhere in Europe (Gagné 2010). See remarks under Cembrotia above for separation of the three new genera from conifers described here.

Figures

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).