Cyclopissus, Constant & Pham, 2024

Constant, Jérôme & Pham, Hong Thai, 2024, Issid planthoppers from Bach Ma and Phong Dien in Central Vietnam. I. Tribe Parahiraciini (Hemiptera: Fulgoromorpha: Issidae), European Journal of Taxonomy 975, pp. 1-64 : 6-9

Genus Cyclopissus gen. nov.

urn:lsid:zoobank.org:act:D6BD8104-B741-4CAD-B236-B60E074A8973

Type species

Cyclopissus corticalis gen. et sp. nov., by present designation.

Diagnosis

The genus is characterized and separated from all other Parahiraciini genera by the following combination of characters:

(1) head with vertex about two times as wide as long in midline, not projecting anteriorly;

(2) frons with a large oculiform black, shiny marking in dorsal portion, and a median carina in ventral portion;

(3) genae without strong carina under the antennae;

(4) body oval in dorsal aspect, less than twice a long as maximum width;

(5) metatibiae with two lateral and seven apical spines;

(6) tegmina with vein CuA straight, unbranched and reaching the hind margin of the tegmen;

(7) anal tube of male dorsoventrally flattened, subhexagonal in dorsal view and with apical angles projecting ventrad;

(8) gonostyli with capitulum rather strongly projecting dorsad, with a rather long neck;

(9) aedeagus evenly curved in lateral view, with a pair of elongate symmetrical, lateroventral processes projecting caudad.

Differential diagnosis

The most similar genus is Tetricodes , which also shows a large, black, oculiform, shiny marking in the dorsal portion of the frons, an oval body, the vertex wider than long, and two lateral spines on the metatibiae (see Vanslembrouck & Constant 2018: figs 1, 4). However, Cyclopissus gen. nov. can be separated by the CuA vein of the tegmen straight and reaching the hind margin of the tegmen (sinuate and not reaching the margin in Tetricodes ), the capitulum of the gonostyli with a rather long neck (short neck in Tetricodes ) and the aedeagus with a pair of elongate symmetrical, lateroventral processes projecting caudad (lateroventral processes of the aedeagus absent in Tetricodes ) (compare with Vanslembrouck & Constant 2018: figs 1, 2, 4, 6).

Etymology

The new genus name is formed by the combination of ‘ Cyclops ’, referring to the one-eyed giant from Greek and Roman mythology, and ‘ Issus ’, the type genus of the family Issidae . It refers to the large oculiform black, shiny marking in the dorsal portion of the frons and the family placement of the new genus. The gender is masculine.

Description

HEAD ( Fig. 4A–D ). Head slightly narrower than thorax. Vertex wider than long, medially grooved, with sides subparallel; anterior and posterior margins subparallel and curved; all margins weakly carinate. Frons elongate with large oculiform black, shiny marking in dorsal portion, median carina in ventral portion and tubercles along lateral margins under midheight of eye. Clypeus flat in middle portion, moderately elongate, subtriangular with fronto-clypeal suture rounded; anteclypeus with median blunt carina. Labium elongate and narrow, reaching metacoxae, with apical segment elongate, nearly as long as penultimate. Eyes reniform (not emarginate); ocelli absent. Antennae rather short with scape ring-shaped and pedicel cylindrical, slightly longer than broad.

THORAX ( Fig. 4A–D ). Pronotum slightly shorter than mesonotum in midline; anterior margin carinate in middle portion, strongly sinuate and strongly, roundly protruding anteriorly between eyes; posterior margin nearly straight, slightly carinate in middle portion; median carina obsolete anteriorly with impressed point on each side; blunt tubercles along anterior margin and irregularly on disc and sides; paranotal lobes (lateral view) broad, with tubercles along posterior margin, and with posteroventral angle rounded. Mesonotum subtriangular with obsolete median carina and weak peridiscal carinae. Tegulae moderately developed, medium sized.

TEGMINA ( Fig. 3A–C ). Tegmina subcoriaceous with longitudinal veins slightly elevated and with rather dense reticulum of veinlets, elongate with sides broadly rounded, slightly more than 2 times as long as broad, convex, without epipleuron. Apex narrowly rounded. Postclaval margin weakly rounded on distal half and slightly notched at apex of clavus. Clavus closed, reaching about 3/5 of tegmen. Venation: ScP+R rather short, forking into subparallel ScP+RA and RP; RP forking at about midlength of tegmen; MP first fork at about half of tegmen length; CuA straight, unforked and reaching hind margin; additional vein in cubital cell, parallel to postclaval margin, originating from level of apex of clavus and not reaching apical margin; Pcu fused with A1 at 3/5 of clavus length; Pcu+A1 fused with CuP at apex of clavus.

HIND WINGS ( Fig. 4E ). Broader than tegmina and deeply bilobed, strongly notched at CuP; costal margin sinuate; CuP-Pcu-A1 lobe much wider than Sc-R-MP-CuA lobe, and slightly longer than latter; both lobes rounded apically; postclaval margin broadly rounded; anal lobe reduced and narrow, with weak A2 vein. Venation: main veins present; ScP+R, MP and CuA running more or less parallel in basal portion, with ScP+R diverging beyond basal ⅓, with numerous cross-veins; Pcu strongly curved around basal third of wing towards CuP and reaching the latter; A1 curved, more or less parallel to postclaval margin; CuP-Pcu-A1 lobe with numerous cross-veins.

LEGS ( Fig. 3 ). Elongate and slender. Tibiae slightly longer than corresponding femora. Metatibiae with 2 lateral spines in distal half and 7 apical spines. Tarsi elongate; first metatarsomere elongate and slender, with a strong spine at each side and a row of 5 smaller spines in between ventrally along posterior margin; second metatarsomere short with one spine at each side. Metatibiotarsal formula: (2) 7 / 8 / 2.

MALE TERMINALIA. Pygofer higher than long in lateral view, with anterior margin weakly concave and posterior margin broadly rounded. Gonostyli rather elongate, projecting posteriorly, with capitulum strongly developed dorsad, with lateral laminate projection and with rather long neck with outer margin strongly concave in posterior view. Anal tube dorsoventrally flattened, rather wide in dorsal view. Aedeagus curved dorsad (in lateral view), with symmetrical pair of elongate lateroventral processes directed caudad. Connective elongate.

Figures

Fig. 4. Cyclopissus corticalis gen. et sp. nov. A–E. Holotype ♂ (VNMN). A. Head and thorax, dorsal view. B. Frons, perpendicular view. C. Head and thorax, lateral view. D. Head and thorax, anterolateral view. E. Right hind wing. F. Paratype ♀ (VNMN), terminalia, ventral view. Abbreviation: see Material and methods.

Fig. 3. Cyclopissus corticalis gen. et sp. nov., dissected holotype, ♂ (VNMN). A. Habitus, dorsal view. B. Habitus, ventral view. C. Habitus, lateral view. D. Right hind leg, ventral view. E. Metatarsus and apex of metatibia, ventral view.