Orthosyntexis elegans J. Gao, Engel, Shih, & T. Gao, 2021
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publication ID |
https://dx.doi.org/10.3897/jhr.86.73161 |
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publication LSID |
lsid:zoobank.org:pub:71F5C11B-C063-474D-BC96-8085C9F43A9C |
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persistent identifier |
https://treatment.plazi.org/id/0A3E4C6A-DB65-4FCA-83D5-E109FEAB9743 |
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taxon LSID |
lsid:zoobank.org:act:0A3E4C6A-DB65-4FCA-83D5-E109FEAB9743 |
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treatment provided by |
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scientific name |
Orthosyntexis elegans J. Gao, Engel, Shih, & T. Gao |
| status |
sp. nov. |
Orthosyntexis elegans J. Gao, Engel, Shih, & T. Gao sp. nov.
Figs 1 View Figure 1 , 2 View Figure 2 and 3 View Figure 3
Etymology.
The specific epithet is derived from the Latin word Orthosyntexis elegans , meaning elegant.
Diagnosis.
Antennal scape length to width ratio slightly less than 3. Forewing 1Rs subvertical to R. Meso- and metafemur shorter than associated tibiae; mesotibial apical spurs elongate and distinctly narrowed apically.
Holotype.
Female, no. CNU-HYM-MA2015101 (Figs 1 View Figure 1 - 3 View Figure 3 ).
Type locality and horizon.
The amber specimen was collected from Kachin (Hukawng Valley) in northern Myanmar, and is dated at 98.79 ± 0.62 Mya ( Cruickshank and Ko 2003; Shi et al. 2012).
Description.
Body about 8.25 mm long in dorsal view, antenna 2.73 mm long in ventral view; forewing about 5.69 mm in length, maximum width 1.74 mm; hind wing about 4.57 mm in length.
Head moderately large, narrower than thorax. Head 1.85 mm wide and 1.23 mm long, nearly quadrate. Compound eyes large and hemispherical; mandible straight, orthogonal with apical margin vertical (parallel to mandibular base) and with lowest tooth not that elongate (Fig. 2C View Figure 2 ); labial palpus with three palpomeres; maxillary palpus with at least five palpomeres; antenna with 16 flagellomeres, scape 0.40 mm long, maximum width 0.14 mm; pedicel 0.39 mm long, maximum width 0.12 mm; flagellomere I shorter than scape, 0.11 mm wide, 0.22 mm long, flagellomere II 0.10 mm wide, 0.19 mm long, as long as individual lengths of remaining flagellomeres (Fig. 2B View Figure 2 ).
Thorax wide, width across tegulae 1.56 mm; pronotum short, having prominent anterior notch and hind margin, with median longitudinal furrow dorsally. Mesoscutum with median longitudinal sulcus and notauli strongly impressed; mesoscutellum tapering to acute apex; ratio of lengths of prescutum, median longitudinal sulcus between notauli, and mesoscuto-mesoscutellar sulcus and mesoscutellum 2.5/1/4.5, notauli terminating close to mesoscutellum (Fig. 1A View Figure 1 ). Legs spindly, meso- and metafemora shorter than associated tibiae. Metafemur length 1.30 mm, metatibia thick subapically, length 1.65 mm. Protibia and metatibia with only one apical spur visible, mesotibia with two apical spurs (Fig. 3C, D and E View Figure 3 ); all tarsomeres with stiff apical setae; basitarsi long but shorter than remaining tarsomeres combined; tarsomere V elongate but shorter than basitarsus; pretarsal claws long, with curved apices and each with a single preapical tooth.
Abdomen only slightly narrower than mesothorax; abdominal tergum I split medially. Segments I and II slightly longer than remaining abdominal segments; ovipositor length 1.86 mm, not protruding beyond abdominal tip, strongly serrated apically (Fig. 2D View Figure 2 and 2E View Figure 2 )
Forewing with dense microtrichia but no coloration pattern except slightly darkened costal area. C and R thick, costal area narrower than C and R widths. Pterostigma completely sclerotized; Sc absent; 1r-rs and 2rs-m absent; 2r-rs issuing from pterostigma at its basal 1/3; 1Rs short and subvertical to R (Fig. 3A View Figure 3 ), about 0.6 × as long as 1M, meeting 1M at right angle. 2Rs+M distinct but short, 0.3 × as long as 1Rs+M. 2r-rs slightly proclival. 2+3M 1.1 × as long as 4M. Cell 1mcu pentagonal, about 1.9 × as long as wide; cell 2mcu hexagonal, about 1.3 × as long as wide. 2Cu 1.7 × as long as 1Cu. 1cu-a strongly reclival, nearly 0.7 × as long as 1Cu. 1m-cu nearly as long as 3Cu, 3Cu shorter than 4Cu. 2m-cu nearly 0.7 × as long as 4M and 1.2 × as long as 1m-cu.
Hind wing Sc absent. Cell r closed. 1Rs (about 0.28 mm in length) shorter than 1M (about 0.35 mm in length). 1rs-m (about 0.27 mm in length) reclival, nearly in line with 1M and as long as 1Rs. 1M straight; m-cu absent; 2M+Cu present (about 0.39 mm in length), free abscissa of Cu and cu-a (about 0.48 mm in length) developed, 1Cu and cu-a straight.
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