Olonia Stål, 1862

Constant, Jérôme & Semeraro, Linda, 2020, Revision of the Eurybrachidae (XVI). The Australian Olonia rubicunda (Walker, 1851): Description of the male, distribution and host plants (Hemiptera: Fulgoromorpha: Eurybrachidae), Belgian Journal of Entomology 107, pp. 1-18 : 1-18

Genus Olonia Stål, 1862

Olonia STÅL, 1862: 488 (description in key; list of included species);

TYPE SPECIES: Eurybrachys rubicunda Walker, 1851 , by subsequent designation in DISTANT 1906: 206.

Lyncilia STÅL, 1863: 248 (description);

TYPE SPECIES: Lyncilia nobilis Stål, 1863 , by monotypy, synonymized by CONSTANT (2018).

DIAGNOSIS. Rather small-sized (6–12 mm), dark brown variegated with black and white, tegmina usually with a white marking along costal margin on nodal line and posterior wings usually with a white marking near externoapical angle, sometimes orange on disc. The genus can be recognized by the following set of characters:

(1) gonostyli strongly sclerotized and fused basally on about ⅓ of length;

(2) gonostyli divided into a centroventral and a laterodorsal parts;

(3) gonostyli with laterodorsal part with large lateral process projecting laterally and bearing dorsoapical, articulate, spoon-shaped process;

(4) aedeagus strongly reduced with dorsal portion of phallobase projecting dorsally as a spine or hook.

The genus shares the condition of possessing a spoon-shaped process on the gonostyli with the Australian genera Chewobrachys Constant, 2008 , Fletcherobrachys Constant, 2006 , Hackerobrachys Constant, 2006 , Maeniana Metcalf, 1952 , Nirus Jacobi, 1928 , Stalobrachys Constant, 2018 and probably Loisobrachys Constant, 2008 , the latter known from the unique female holotype, but differs from these genera by characters given by CONSTANT (2018).

SPECIES INCLUDED (12):

Olonia bourgoini Constant, 2018

Olonia danielsi Constant, 2018

Olonia guillaumei Constant, 2018

Olonia hochae Constant, 2018

Olonia marginata Distant, 1906

Olonia maura (Fabricius, 1775)

Olonia monteithi Constant, 2018

Olonia nobilis ( Stål, 1863)

Olonia picea Kirkaldy, 1906

Olonia rubicunda ( Walker, 1851)

Olonia rylandae Constant, 2018

Olonia soulierae Constant, 2018 .

Identification key to the species of Olonia

Modified from CONSTANT (2018). Illustrations marked with * are found in CONSTANT (2018)

1. Process of the laterodorsal part of gonostyli bifid (*figs 30 D, 33 D) ................................... 2

– Process of the laterodorsal part of gonostyli not bifid (*figs 5 D, 10 D, 19 D) ...................... 5

2. Process of the centroventral part of gonostyli with several teeth apically (*fig. 30 C) .......................................................................................................... O. maura (Fabricius, 1775)

– Process of the centroventral part of gonostyli without teeth apically (*figs 33 C, 42 C) ....... 3

3. Processes of the laterodorsal part of gonostyli both curved and convergent apically, subequal in length and surpassing process of centroventral part in ventral view (*fig. 42 A, C–D); lateral process of gonostyli directed anteriorly (*fig. 42 C) .......................... O. picea ( Kirkaldy, 1906)

– Processes of the laterodorsal part of gonostyli slightly diverging or subparallel apically with ventral/central one straight, and not surpassing level of apex of process of centroventral part in ventral view (*fig. 33A, C–D; Fig. 3 A–C, F ) ........................................................................... 4

4. Processes of the laterodorsal part of gonostyli in a nearly vertical plane, and projecting dorsally well above the centroventral part in lateral view (*fig. 33 A, C–D); anal tube more elongate, 2.3 times longer than wide in dorsal view (*fig. 33 B); phallus short and wide (*fig. 33 F); dorsal processes of periandrium strongly hooked dorsally (*fig. 33 E)............................ ........................................................................................................ O. monteithi Constant, 2018

– Processes of the laterodorsal part of gonostyli in a nearly horizontal plane, and projecting posteroventrally under the centroventral part in lateral view ( Fig. 3 A–D ); anal tube less elongate, 1.9 times longer than wide in dorsal view ( Fig. 3 E ); phallus elongate ( Fig. 3 I–J ); dorsal processes of periandrium projecting posterodorsally ( Fig. 3 G ) ....................................... .......................................................................................................... O. rubicunda Walker, 1851

5. Processes of the laterodorsal part of gonostyli surpassing processes of centroventral part in ventral view (*figs 19 C, 46 C) .................................................................................................. 6

– Processes of the laterodorsal part of gonostyli shorter than processes of centroventral part in ventral view (*figs 5 C, 10 C, 37 C) .......................................................................................... 7

6. Processes of the laterodorsal part of gonostyli strongly sinuate with central portion straight (*fig. 46 A, C) .................................................................................. O. rylandae Constant, 2018

– Processes of the laterodorsal part of gonostyli strongly and regularly curved ventrally (*fig.

19 A, C)............................................................................................ O. marginata Distant, 1906

7. Anal tube elongate and narrow, more than 3 times longer than broad, and with sides subparallel (*figs 5 B, 10 B) ...................................................................................................... 8

– Anal tube broader, less than 2.5 times longer than broad, and with sides curved (*figs 8 B, 37 B).............................................................................................................................................. 10

8. Processes of the laterodorsal part of gonostyli falcate, broader at midlength and incurved (*fig. 5 A, C–D) ............................................................................. O. bourgoini Constant, 2018

– Processes of the laterodorsal part of gonostyli regularly narrowing from base to apex and not incurved (*fig. 10 A, C–D) ........................................................................................................ 9

9. Processes of the laterodorsal part of gonostyli curved laterally (*fig. 10 C–D); process of centroventral part of gonostyli with ventral margin convex in lateral view (*fig. 10 A) ...................................................................................................... O. guillaumei Constant, 2018

– Processes of the laterodorsal part of gonostyli curved ventrally (*fig. 13 C–D); process of centroventral part of gonostyli with ventral margin slightly concave in lateral view (*fig. 13 A) ............................................................................................................ O. hochae Constant, 2018

10. Anal tube with apical margin notched and lateral margins subparallel beyond epiproct (*fig. 48 B); process of centroventral part of gonostyli very elongate and narrow, more than 10 times longer than wide at mid-length in ventral view (*fig. 48 A, C)...... O. soulierae Constant, 2018

– Anal tube with apical margin not notched and lateral margins not subparallel beyond epiproct (*figs 8B, 37B); process of centroventral part of gonostyli not very elongate and narrow, less than 10 times longer than wide at mid-length in ventral view (*figs 8A, C, 37A, C) ............. 11

11. Processes of the centroventral part of gonostyli incurved and slightly surpassing processes of lateroventral part in ventral view (*fig. 37C); anal tube regularly narrowing beyond epiproct (*fig. 37B) ................................................................................................ O. nobilis ( Stål, 1863)

– Processes of the centroventral part of gonostyli strongly hooked dorsally by apex and strongly surpassing processes of lateroventral part in ventral view (*fig. 8C); anal tube broadening beyond epiproct to 2/3 its length (*fig. 8B) ...................................... O. danielsi Constant, 2018

Figures

Fig. 3. Olonia rubicunda Walker, 1851, ♂ terminalia, specimen from Lammermoor (QM). A, pygofer, anal tube and gonostyli, lateral view. B, pygofer, anal tube and gonostyli, ventral view. C, pygofer, anal tube and gonostyli, laterodorsal view. D, pygofer, anal tube and gonostyli, caudal view. E, pygofer, anal tube and gonostyli, dorsal view. F, pygofer, anal tube and gonostyli, dorsolateral view. G, aedeagus, lateral view. aedeagus, laterodorsal view. aedeagus, dorsal view. aedeagus, ventral view. An: anal tube; cv: connective; cvp: centroventral part of gonostylus; dpp: dorsal portion of phallobase; ep: epiproct; G: gonostylus; ldp: lateroventral part of gonostylus; lp: lateral process of gonostylus; ph: phallus; Py: pygofer; ssp: spoon-shaped process; vpp: ventral portion of phallobase.