Eoeurysa Muir, 1913

N., Ramya, Bartlett, Charles & Meshram, Naresh M., 2020, Two new species of planthoppers from India (Hemiptera: Auchenorrhyncha: Delphacidae) in the genera Parasogata and Eoeurysa, European Journal of Taxonomy 724, pp. 93-108 : 99-100

Genus Eoeurysa Muir, 1913

Eoeurysa Muir, 1913: 249 .

Type species Eoeurysa flavocapitata Muir, 1913 (by monotypy).

Amended diagnosis

Habitus colouration varies from near black (in male E. flavocapitata ) to near white. Body distinctly dorsoventrally flattened ( Fig. 3 A–C). Head including eyes narrower than pronotum, projecting slightly in front of eyes. Vertex broad, narrowed anteriorly, as long as wide at base, Y-shaped carina distinct, apically converging at fastigium ( Fig. 3D ); fastigium rather angled ( Fig. 3C ) (appearing carinae when viewed from ventral aspect). Frons broad, lateral margins arched, slightly longer in middle line than wide at widest part, widest somewhat above frontoclypeal suture, median carina prominent and forked at fastigium. Basally clypeus as wide as apex of frons on dorsal margin. Rostrum reaching to mesocoxae ( Fig. 3E ). Ocelli present. Antennae terete, scape about as long as wide, pedicel exceeding 2× scape; surpassing frontoclypeal suture ( Fig. 3 D–E). Pronotum broad, lateral carinae attaining hind margin ( Fig. 3D ). Spinal formula of hind leg 5-7-4. Post-tibial spur with 17–19 fine teeth. Pygofer with laterodorsal angles not produced, in posterior view with opening rather quadrangular, appearing wider than long, medioventral process absent; diaphragm relatively weak, moderately wide, dorsal margin convex, protruding into a plate ( Fig. 4B, D, G ). Phallus tubular, approximately straight ( Fig. 4C ). Suspensorium elongate quadrangular, circular at ventral half. Segment 10 (anal segment) ring-like with short latero-apical processes ( Fig. 4A ).

Remarks

The genus can be distinguished by the depressed shape of the body (reminiscent of Eumetopina Breddin, 1896 ), and the broad, apically converging vertex. Eoeurysa is similar to Eumetopina , although the latter genus has a broader frons and displays processes on the medioventral portion of the pygofer opening.

Biology

Host associations of the genus are giant cane ( Arundo donax L.) for Eoeurysa arundina Kuoh & Ding, 1980 ( Kuoh et al. 1980) and sugarcane ( Saccharum sinense Roxb. and S. officinarum L.) for Eoeurysa flavocapitata ( Chatterjee 1971; Wilson 1987; Wilson et al. 1992; Ding 2006).

Key to the species of Eoeurysa Muir, 1913 (revised from Yang 1989)

1. General colouration mostly dark brown; vertex nearly as broad as long on midline ( Yang 1989: fig. 110A); males with parameres nearly parallel-sided (not expanded medially, Yang 1989: fig. 110E); aedeagus lacking basal process (bearing flattened projection near midlength ( Yang 1989: fig. 110J) ................................................................................................. E. flavocapitata Muir, 2013

– General colouration pale (except clypeus and adjacent parts); vertex longer in midline than broad; male with parameres expanded medially; aedeagus with elongate process off dorso-basal portion 2

2. Clypeus dark ( Yang 1989: fig. 111B); parameres very broad medially; aedeagus with 7–8 dorsal teeth ( Yang 1989: fig. 111E, H) ..................................................... E. arundina Kuoh & Ding, 1980

– Clypeus pale yellowish ( Fig. 3E ); parameres modestly expanded medially, in lateral view with mediolateral process ( Fig. 4 E–F); apex of aedeagus sagittate, lacking dorsal teeth ( Fig. 4C ) ........... ............................................................................................................................ E. sagittaria sp. nov.

Figures

Fig. 3. Eoeurysa sagittaria sp. nov., habitus. A, C–D. Holotype ♂ (NPC HEMT9). B. Paratye ♀ (NPC HEMT14). A. Male habitus, dorsal view. B. Female habitus, dorsal view. C. Habitus, lateral view. D. Head, pro- and mesonotum, dorsal view. E. Head, ventral view.

Fig. 4. Eoeurysa sagittaria sp. nov., male genitalia, holotype (NPC HEMT9). A. Aedeagal complex. B. Male genitalia, caudal view. C. Aedeagus.D. Male genitalia, lateral view. E. Parameres, caudal view. F. Paramere, lateral view. G. Pygofer, caudal view.