Chionomus gluciophilus ( Muir, 1926 ) Weglarz & Bartlett, 2020

Weglarz, Kathryn M. & Bartlett, Charles R, 2020, A revision of the planthopper genus Chionomus Fennah (Hemiptera: Fulgoroidea: Delphacidae), Zootaxa 4811 (1), pp. 1-63 : 23-25

Chionomus gluciophilus ( Muir, 1926) , new combination

( Figures 10 , 25 )

Delphacodes gluciophila Muir, 1926: 35 .

Type Locality. Ecuador, Tungurahua Province, Banos .

Diagnosis. Body brunneous, dark, shining, with stramineous markings. Vertex quadrate; foveae of frons and vertex very dark. Carinae of the head distinct, yellow in color except for median carina of the vertex; antennae stramineous. Pronotum entirely dark, paranota ivory. Armature of diaphragm forming toothed cordate or dorsally notched boss; parameres with apices slightly concave, broadest in basal third. Aedeagus tubular, sinuate, with a row of scattered teeth on either side connecting at the aedeagal base; segment X with 4 processes.

Description. Color. Macropter. Body dark, brunneous, shining, with white or ivory markings. Carinae of head (including genal carinae) distinct, off-white to ivory in color; median carinae of vertex concolorous. Antennae stramineous, infuscate at joint of two segments. Pronotum dark brown, paranota white to ivory, fuscous marking directly below compound eyes. Mesonotum dark, median and lateral carinae obscure. Legs yellow, with fuscous striping on femora. Forewings hyaline, distinct dark spot just before apex of clavus. Abdomen dark brown, thin line along caudal edge of each segment yellow, lateral projections of sternites yellow. Pygofer and segment X concolorous with body. Brachypter. Similar to above. Tegmina infuscate, white stripe along apex, darkened spot near apex of clavus. Structure. Body. Length (in mm) female (♀) macropter 2.45±0.11 (n=3); width ♂ 0.73±0.06 (n=7); ♀ 0.94±0.03 (n=3). Head. Vertex length 0.17±0.04 (n=10); vertex width 0.18±0.02 (n=10); frons length 0.51±0.04 (n=10); frons width 0.24±0.03 (n=10). Macropter. Carinae of vertex distinct, stem of Y-shaped carina faint. In lateral view ( Figure 10c ), fastigium rounded; projecting in front of the eye about 1/4th eye length. Carinae of frons and clypeus distinct ( Figure 10b ), frons parallel, widest at ventral third of compound eyes. Antennal segments subequal in length, segment II wider than segment I; 2nd segment sparsely setaceous, bearing sensory pits arranged 3, 3, 2, 2, evenly spaced around segment. Sensory pits surrounded by small black setae. Brachypter. Same as above except stem of Y-shaped carina evident.

Thorax. Macropter. Carinae of mesonotum weak, median carina ending anterior to scutellum, lateral carinae faint, diverging posteriorly to reach hind margin. Legs with two rows of setae on ventral margin of femora, mostly bare. Calcar bearing 23–26 small teeth. Brachypter. Same as above but with lateral carinae mesonotum evident, diverging posteriorly; tegmina apically rounded, long.

Abdomen. Macropter. Compressed dorsoventrally, tapering caudad to truncate apex; abdominal spiracles with one or two fine setae.

Genitalia. Pygofer in lateral view three fifths as long dorsally as ventrad, ventral margin sinuate. In caudal view ( Figure 10e , 25a ), four fifths as tall as wide, rounded; margins raised, dorsolateral margins produced, carinate. Opening to inner chamber trapezoidal, pointed ventrad. Armature of diaphragm cordate, notched at dorsal margin, toothed on vertical edges, distinctly projecting caudad. Parameres, widest in basal third, basal angle strong, projecting, rounded; dorsolaterally diverging, apices slightly concave, lateral margins concave, inner and outer angles approximately equally produced. Aedeagus circular in cross-section, sinuate, widest near base, slightly tapering for most of length; aedeagus bearing row of scattered teeth on both sides, along ventral edge, sometimes with 2–4 extra teeth just proximal to gonopore; gonopore large, dorsal, subapical. Segment X quadrate, taller than wide; with 4 processes, first pair distinct, broadly approximated, second pair longer than first, closely approximated. Segment XI produced, about half length of segment X.

Plant associations. Saccharum L. (sugarcane, Poaceae, Muir, 1926 ); Phaseolus vulgaris L., (kidney bean, Fabaceae ); Solanum tuberosum L. (Irish potato, Solanaceae ) (label information).

Distribution. Guatemala; Costa Rica; Colombia; Ecuador.

GenBank accession number. Molecular sequence was unable to be generated at the time of this study.

Remarks. Chionomus gluciophilus is closely allied with C. dissipatus and has an overlapping distribution. Chionomus gluciophilus can be distinguished by the dark carinae of the pronotum and posterior compartments of the vertex, the more scattered teeth on the aedeagus, the notch in the dorsal edge of the armature of the diaphragm, and the absence of a rounded projection on the basal exterior edge of the parameres. It is also similar to C. quadrispinosus but differs from this species in a manner similar to the ways it differs from C. dissipatus (see remarks for that species).

Type material examined. Holotype [ BPBM]: Macropterous ♂, “ Delphacodes / gluciophila / ♂ / Muir / Type 1152. [Handwritten, white card with hole punch containing genitalia embedded in balsam] // Banos, Or. / 6000 ft. / Ecuador / XII-26-1922 [Elevation and date Handwritten] // F.X. Williams / Collector // Sugarcane // Holotype [Red paper, vertically oriented, affixed to following label] // Delphacodes / gluciophila / ♂ Muir/ Type No 1152. [Hand- written, label with black border] // 865 [Handwritten]”.

Figures

FIGURE 10. Habitus of Chionomus gluciophilus (holotype, C, E, G, H embedded in balsam). A. dorsal habitus; B. labels of holotype; C. aedeagus; D. lateral habitus; E. parameres, caudal view; F. frontal habitus; G. anal tube, semilateral view; H. pygofer, caudal view.

FIGURE 25. Line art of Chionomus gluciophilus, terminalia, A. pygofer, caudal view, B. anal tube, left lateral view, C. aedeagus, left lateral view; D. left paramere, widest view.