Acuthana

Domahovski, Alexandre C. & Cavichioli, Rodney R., 2018, Two new remarkable genera and two new species of Gyponini (Hemiptera: Cicadellidae: Iassinae) from Brazil, European Journal of Taxonomy 476, pp. 1-17: 4-7

publication ID

https://doi.org/10.5852/ejt.2018.476

publication LSID

lsid:zoobank.org:pub:urn:lsid:zoobank.org:pub:AE4012EC-21E1-4E63-A51E-C9C892D6F07E

persistent identifier

http://treatment.plazi.org/id/5B8D7B54-084D-4352-897C-F303E8DE6D32

taxon LSID

lsid:zoobank.org:act:5B8D7B54-084D-4352-897C-F303E8DE6D32

treatment provided by

Plazi

scientific name

Acuthana
status

gen. nov.

Genus Acuthana  gen. nov.

urn:lsid:zoobank.org:act:5B8D7B54-084D-4352-897C-F303E8DE6D32

Figs 2 View Figure –22, 44–45

Type species

Acuthana transgressa  gen. et sp. nov.

Diagnosis

Head ( Fig. 2 View Figure ), with median length of crown slightly less than half interocular width; head surface dorsally with transverse parallel striae; ocelli closer to eyes than to median line and equidistant between anterior and posterior margins of crown; laterally ( Fig. 4 View Figure ), with crown-face transition defined with three carinae. Forewing ( Fig. 5 View Figure ) anterior half with venation indistinct, heavily punctuated; posterior half distinctly tapered toward apex, venation reticulated. Male with sternite VIII ( Fig. 6 View Figure ) triangular ventrally, strongly produced and fully hiding subgenital plates. Aedeagus ( Figs 13–14 View Figure ) with atrial processes; dorsal apodeme strongly developed laterodorsally.

Etymology

The generic name Acuthana  , comes from the Latin word ‘ acutus ’ and means ‘acute’. It refers to the forewing with apical portion distinctly acute. The suffix ‘ -ana ’ is common in names of other genera of Gyponini  .

Description

MEASUREMENTS. Body length: male 8.7 mm; female 9.0 mm.

HEAD ( Figs 2–4 View Figure ). Dorsal view: not produced anteriorly, median length of crown slightly less than half interocular width; crown with anterior margin broadly rounded; surface slightly convex, with transverse parallel striae; transocular width of head nine-tenths humeral width of pronotum; ocelli closer to eyes than to median line and equidistant between anterior and posterior margins of crown; frontal view: face as wide as high; clypeus ca 1.6 times longer than wide, lateral margins parallel, apex straight; maxillary plates produced ventrally as far as clypeus apex; frons as long as wide, flat, not excavated below anterior margin of crown; frontogenal suture not surpassing antennal ledges and distance from eye internal margins equal to maximum clypeus width; antennal ledge carinate and transversal; lateral view: crown-face transition defined, thick, with three clearly defined carinae.

PRONOTUM ( Fig. 2 View Figure ). Transverse striae on disc and posterior third dorsally; lateral margins shorter than eye length, convergent anterad; posterior margin slightly excavated; laterally ( Fig. 4 View Figure ) slightly declivous; head and pronotum in continuous slope.

MESONOTUM ( Fig. 2 View Figure ). Wider than long.

FOREWING ( Fig. 5 View Figure ). Anterior half with venation indistinct, heavily punctuated; posterior half distinctly tapered toward apex, venation reticulated; appendix moderately developed.

LEGS. Profemur four times longer than high; AV row formed by five–six setae and PV row absent; protibia circular-shaped in cross section; AV row formed by short setae in basal half and four–five thick, long setae in distal half; PD row formed by four long setae with some intercalary short setae; PV row developed, with four long setae; metafemur with setal formula 2:2:1; metatibia AD row with intercalary setae between macrosetae; PV row with setae of apical half long and heterogeneous in length and thickness, with long, thick setae followed by four slightly shorter and thinner setae; first tarsomere with outer row of setae absent and inner row formed by approximately nine very short setae, apex with four platellae; second tarsomere apex with two apical platellae.

MALE TERMINALIA. Sternite VIII ( Fig. 6 View Figure ) triangular, strongly produced and fully hiding subgenital plates. Pygofer ( Fig. 8 View Figure ) simple, without processes. In dorsal view, style ( Fig. 10 View Figure ) very elongated; outer lobe conspicuous. Aedeagus ( Figs 13–14 View Figure ) with atrial processes; dorsal apodeme strongly developed laterodorsally.

FEMALE TERMINALIA. Valvulae ( Figs 15 View Figure –16) surpassing pygofer apex. Second valvula (Fig. 19) curved ventrally, very elongated, more than six times longer than maximum height; apical portion (Fig. 20) with irregular teeth on dorsal margin and some small teeth on ventral margin near apex. Gonoplac (Figs 21–22) with short macrosetae near apex.

Distribution

Brazil (Mato Grosso). 

Remarks

The head of Acuthana  gen. nov. is similar to those of Ponana Ball, 1920  , Costanana DeLong & Freytag, 1972  , Regalana DeLong & Freytag, 1975  and Nullana DeLong, 1976  , which all have the crown surface with transverse parallel striae and the crown-face transition clearly defined, not rounded as in Polana DeLong, 1942  , and with transverse carinae or striae. The new genus is probably more related to Costanana  by the shape of the male sternite VIII strongly produced and fully hiding the subgenital plates as in some species (e.g., Costanana cella DeLong & Freytag, 1972  and Costanana flavina DeLong & Freytag, 1972  ) and the shape of the subgenital plate tapered apically with apex acute, which is common in several species of this genus. However, species of Costanana  are characterized by the forewings with the basal half of costal margin yellow, aedeagus without atrial processes and aedeagal shaft commonly with apical processes.

The characteristics of the forewing of Acuthana  gen. nov. are very unusual. The basal half with many punctuations resembles the forewing of Dragonana Ball & Reeves, 1927  whereas the presence of reticulations on the apical half similar to Gyponana Ball, 1920  and Chloronana DeLong & Freytag, 1964  . Moreover, the very tapered wing apex is not characteristic of the genera cited. The shape of the female second valvula in Acuthana  gen. nov. is very elongated like in species of Costanana  . However, most genera of Gyponini  , including Costanana  , have the second valvula curved dorsally ( Fig. 40 View Figure ) or approximately straight, but the new genus differs by the second valvula curved ventrally, which is a highly unusual characteristic in Gyponini  .

DZUP

Universidade Federal do Parana, Colecao de Entomologia Pe. Jesus Santiago Moure