Symplocodes euryloba sp. nov.

(Figures 1I, J, 7A – L, 8P)

Type specimens

Holotype: male, China, Hainan Prov., Nada, April 1962, coll. Y Zhou (SWU) . Paratype: one male, China, Hainan Prov ., Mt Jianfengling, 17 June 1982, coll . LY Zheng (SYSU).

Description

Length, male, overall length including tegmen: 11.5 mm; pronotum length × width: 2.6 × 3.7 mm; tegmen length: 9.0 mm.

Body small, pale yellow to yellowish brown (Figure 1J). Vertex yellowish brown with irregular brown maculae. Face blackish brown. Ocellar spot yellowish white (Figure 1I). Antennae yellowish brown. Fifth maxillary palpomere brown with apical part yellowish white, the others yellowish brown (Figure 1I). Pronotum yellowish brown, with one dark brown curved stripe on lateral corner, and lateral borders nearly hyaline (Figures 1J, 7D). Tegmina yellowish brown (Figure 1J), hind wings hyaline. Abdominal terga blackish brown, sterna yellowish brown with brown spots on lateral borders (Figure 1J).

Vertex with interocular space less than the distance between antennal sockets (Figure 7A). Fourth and fifth maxillary palpomeres approximately same length, and both shorter than the third (Figure 7B). Pronotum subelliptical, broadest width behind the middle, hind margin slightly produced medially (Figure 7D). Tegmen with six anterior rami of radius; with 10 apical rami of radius and unbranched; median and cubitus veins longitudinal, median vein with one complete branch before the middle, and cubitus vein with three complete branches, one with secondary divisions (Figure 7E). Hind wing with branched R1 and with one anterior rami of radius; median and cubitus veins weakly curved, the former simple and cubitus vein with one single complete branch near apex, incomplete branch absent (Figure 7F). Front femur Type A3 (Figure 7C), pulvilli on four proximal tarsomeres. Tarsal claws symmetrical, distinctly dentate (Figure 8P). Seventh abdominal tergum specialized, with a pair of oblique ridges (visible in pinned specimen) through centre and posterior part, the centre hyaline, and with reduced lateral lobes at disc (Figure 7G).

Supra-anal plate (Figure 7H) in ventral view symmetrical and nearly triangular, with hind margin slightly concave in the middle; right and left intercercal processes similar, large and upturned, apex tapering and each with a spinous process near apical third. Right and left paraprocts (Figure 7H) irregular and dissimilar. Subgenital plate (Figure 7I) in dorsal view asymmetrical, left posterolateral corner with a non-setose process which is broad, upturned and blunt at apex, the right posterolateral corner weakly produced and with setae; hind margin arcuate and produced in the middle, left side with small spines, setae, and a process with spines on right side; right stylus arising at the concavity of right side of subgenital plate, left stylus absent. Genitalia with L3 (Figure 7J) very small, without pre-apical incision; L2vm (Figure 7K) slender and rod-like, with distal part curved and apex acute, the membranous filament arising near the apical quarter; R2 (Figure 7L) curved, R3 (Figure 7L) with upper lobe resembling a long handle and lower lobe nearly fan-shaped.

Remarks

This species bears a close resemblance to S. juxtaridleyi Roth, 1995, but differs from the latter in the following: (1) subgenital plate with hind margin arcuate and produced in the middle, but in the latter coniform; (2) left posterolateral corner process of subgenital plate upturned and blunt at apex, but the process of the latter with apex acute; (3) L2vm with inner margin smooth, but the latter with inner margin minutely serrated; (4) left stylus absent, but the latter with left stylus.

Etymology

The specific epithet is derived from the Latin word “ eurylobus ”, referring to the subgenital plate being broad as a result of the protrusion on the left posterolateral corner.

Distribution

China (Hainan).

Checklist of the species and subspecies of Symplocodes

1. Symplocodes amicus Bey-Bienko, 1958: 673 . (China)

2. Symplocodes annamensis (Hanitsch, 1927: 9, Ceratinoptera). (Vietnam, Thailand)

3. Symplocodes impar Bey-Bienko, 1969: 857 . (India)

4. Symplocodes juxtaridleyi Roth, 1995: 997 . (Thailand)

5. Symplocodes manubria Feng et Guo, 1990: 340 . (China)

6. Symplocodes marmorata (Brunner von Wattenwyl, 1893: 19, Phyllodromia). (China, Myanmar, Thailand)

Subspecies Symplocodes marmorata marmorata (Brunner von Wattenwyl, 1893: 19) . (China, Myanmar, Thailand)

Subspecies Symplocodes marmorata tsaii (Bey-Bienko, 1958: 673) comb. nov. (China)

7. Symplocodes ridleyi (Shelford, 1912: 660, Hemithyrsocera). (China, Singapore, Indonesia, Malaysia)

8. Symplocodes euryloba sp. nov. (China)

Key to species and subspecies of Symplocodes worldwide (males)

1. Right stylus present (Figures 2I, 3I, 4K – L, 6J, 7I).............................................................. 2 Right stylus absent......................................... ......................................... Symplocodes impar

2. Hind margin of subgenital plate produced, left portion with a large or small process ............................................................................................................................................... 3 Hind margin of subgenital plate slightly produced to left, without process.......... ........................................................................................................................ Symplocodes amicus

3. Left stylus present..................................... ..................................... Symplocodes juxtaridleyi Left stylus absent (Figures 2I, 3I, 4K, L, 6J, 7I).................................................................. 4

4. Ventral surface of supra-anal plate with several spines near hind margin (Figures 2H, 3H, 4H – J)................................................................................................................................... 5 Ventral surface of supra-anal plate without spines (Figures 6H, I, 7H) ................. 7

5. Left posterolateral margin of subgenital plate with a large and long handle-like process, pointed to the left and somewhat upwards; paraprocts without spinelike process (Figure 2H – I)............................... ............................... Symplocodes manubria Left posterolateral margin of subgenital plate with a small process, pointed to the lower left corner; paraprocts with several spine-like processes (Figures 3H, I, 4H – L)................................................................................................................................................... 6

6. Intercercal processes with apices divided into two to four spinous branches and upcurved; the upper branch obviously larger than the lower ones (Figure 4H – J) ............................................................................. Symplocodes marmorata tsaii comb. nov. Intercercal processes with apex tapering and each with a spine-like process preapically, which is connected to the main part of the process by membrane (Figure 3H) ............................... ............................... Symplocodes marmorata marmorata

7. Seventh abdominal tergum modified, without setae in the middle (Figure 7G) ............................................................................................. Symplocodes euryloba sp. nov. Seventh abdominal tergum modified, with setae in the middle (Figure 6G) .... 8

8. Seventh abdominal tergum with reduced lateral lobes, subgenital plate with left posterolateral corner produced and elongated, apex slightly concave..................... .............................................................................................................. Symplocodes annamensis Seventh abdominal tergum without reduced lateral lobe, subgenital plate with left posterolateral corner produced and unevenly broad, apex broadly rounded (Figure 6G,J)................................................................................................ Symplocodes ridleyi