Constant, Jérôme, 2018, Revision of the Eurybrachidae XIV. The Australian genera Olonia Stål, 1862 and Stalobrachys gen. nov. (Hemiptera: Fulgoromorpha), European Journal of Taxonomy 486, pp. 1-97: 72-75
treatment provided by
Olonia rylandae sp. nov.
This species can be recognized by the following combination of characters:
(1) hind wings without orange marking ( Fig. 45EView Fig. 45)
(2) pro- and mesofemora and -tibiae mostly brown ( Fig. 45A–DView Fig. 45)
(3) anal tube of male oblong, with posterior margin slightly concave and lateral margins sinuate ( Fig. 46BView Fig. 46)
(4) centroventral part of gonostyli with elongate and narrow process strongly sinuate basally and with small apical hook pointing ventrally ( Fig. 46A, CView Fig. 46)
(5) laterodorsal part of gonostyli with elongate and narrow process slightly curved lateroventrally ( Fig. 46A, C–DView Fig. 46)
(6) rather small size: 7.7 mm
This species is dedicated to Mrs Valry Ryland ( Magnetic Island , Queensland, Australia) in acknowledgement for all her help and involvement in documenting the natural history of species of Olonia .
Holotype AUSTRALIA • ♁; Queensland, Bathurst Head ; [14°16′ S, 144°12′ E]; “Bathurst Head, Q., Jan. 1927, Hale & Tindale”; dissected, right anterior leg missing, right posterior wing mounted; SAMAbout SAM.GoogleMaps
MEASUREMENTS AND RATIOS. LT: ♁ (n = 1): 7.7 mm; BV/LV = 4.38; BF/LF = 1.7; LP+LM/BT = 0.67; LTg/BTg = 2.5; LW/BW = 2.0.
HEAD ( Fig. 45A–DView Fig. 45). Vertex concave, with anterior and posterior margins parallel, curved; brown, slightly wrinkled. Frons uniformly brown, slightly wrinkled. Clypeus elongate, brown. Genae yellowish with brown markings around eyes and under antennae. Labium dark brown, reaching metacoxae. Antennae black-brown; scape short, ring-shaped; pedicel subcylindrical, slightly narrowing towards apex.
THORAX ( Fig. 45A–CView Fig. 45). Pronotum brown with small yellowish spot on each side; slightly wrinkled; obsolete median carina and 2 small impressed points on disc. Lateral fields of prothorax brown. Mesonotum brown; yellowish spot on middle of anterior margin and at apex of scutellum; slightly rugulose; median and peridiscal carinae weakly marked; median carina stopping before scutellum; slight impression before scutellum. Red ventrally. Tegulae brown.
TEGMINA ( Fig. 45A, CView Fig. 45). Brown, slightly variegated with yellowish; pale yellowish marking on vein A1 at midlength of clavus; marked with black along costal margin, more broadly so on posterior half, and along posterior margin. Triangular white marking on costal margin on nodal line; no white spot at apicosutural angle. Costal and sutural margins subparallel; costal margin slightly sinuate; apical margin obliquely rounded.
POSTERIOR WINGS ( Fig. 45EView Fig. 45). Brown, paler on anal area and with large blackish area reaching apical margin; elongate, transverse, subtriangular white marking at apicocostal angle, extending on 3–4 cells. Margin of anal area slightly sinuate; sutural margin with 1 cleft, cubital one nearly not marked.
LEGS ( Fig. 45A–DView Fig. 45). All coxae brown. Pro- and mesofemora dark brown. Pro- and mesotibiae brown, turning blackish apically, and with 3 very obsolete paler rings. Pro- and mesotarsi brown, with basal half of third tarsomere paler. Metafemora pale brown with apex darker. Metatibiae brown, with 3 lateral spines paler basally and 8 apical black-brown spines. Metatarsi brown, with a ventral row of 6 black spines on first tarsomere.
ABDOMEN. Bright red with genital segments black-brown.
MALE GENITALIA ( Fig. 46View Fig. 46). Posterior margin of pygofer in lateral view strongly sinuate, rather angularly, roundly projecting at dorsal ½ and rather broad ventrally ( Fig. 46A, CView Fig. 46). Anal tube oblong, 2.9 times as long as broad, broader at apical ¾, with lateral margins sinuate and apical margin concave; lateral margins curved ventrally on apical ¾; slightly curved ventrally near base in lateral view ( Fig. 46A–BView Fig. 46). Gonostyli fused on slightly less than basal half of length of centroventral part and projecting posteriorly ( Fig. 46A, CView Fig. 46). Centroventral part broad and dorsoventrally flattened on basal half, then strongly narrowing into elongate, narrow process, strongly sinuate basally in lateral view and ending in narrow hook curved anteroventrally ( Fig. 46A, CView Fig. 46). Laterodorsal part of gonostyli elongate and slightly curved posteroventrally, posteriorly slightly surpassing level of centroventral part; lateral process elongate, projecting posterolaterally, slightly concave dorsally and longer than spoon-shaped process ( Fig. 46A, C–DView Fig. 46). Dorsal portion of phallobase with hooked process on each side, narrowing in 2 steps from base to apex, directed posterocentrally and with apex pointing dorsally ( Fig. 46E–FView Fig. 46). Ventral portion of phallobase elongate and narrow, curved posteroventrally ( Fig. 46E–FView Fig. 46). Phallus dorsoventrally flattened, medially concave, broadening towards apex and emarginate apically ( Fig. 46E–FView Fig. 46).
Distribution and biology
This species is only known from a single male from Bathurst Head, a headland covered with open forest close to Cape Melville on the eastern coast of Cape York Peninsula ( Fig. 3View Fig. 3), in the Cape York Peninsula Tropical Savanna bioregion. It was collected in January, nearly one century ago.
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