Gabriel Mejdalani

Taxonomic revision and phylogenetic analysis of the sharpshooter genus Balacha Melichar (Hemiptera: Cicadellidae: Cicadellini)

Abstract.  Balacha currently includes six valid described species and B. caparao sp. nov., here described from Minas Gerais State, Brazil. The new taxon differs from other Balacha species in the ventrally inflated preapical aedeagal area and oblique bases of the ovipositor first valvulae. New records are as follows: B. decorata from Paraguay and Minas Gerais State (Brazil); B. distincta from Brazil; B. melanocephala from Montevideo Department (Uruguay) and Buenos Aires and Distrito Federal provinces (Argentina); and B. similis from Rio de Janeiro and Minas Gerais states (Brazil). Colombia is considered a dubious record for the genus. Phylogenetic relationships among Balacha species are examined based on a matrix of eighteen terminal taxa and sixty‐seven morphological characters. Balacha may be defined by the following synapomorphies: crown–frons transition approximately acute, crown anteriorly produced and with anterior margin subangulate, flattened pronotum continuing contour of head and mesonotum in lateral view, and teeth of second valvulae of ovipositor with anterior dorsal projection. The genus comprises two major lineages: the red Balacha clade (B. lepida(B. distincta + B. rubripennis)), and the black Balacha clade (B. caparao(B. decorata(B. melanocephala + B. similis))). Despite the scarcity of data on host plant usage of outgroup taxa (probably generalists on Lamiaceae, Lauraceae, and Asteraceae), we believe that the shift to feeding on Eryngium(Apiaceae) occurred in the ancestor of all recent Balacha species. Their small size and depressed body appear to be adaptations to living inside the rosette‐disposed leaves, and they seem to be restriced to this microhabitat. Balacha and their Eryngium hosts occur in grasslands in temperate South America, but at lower latitudes in Brazil they are isolated in alpine meadows on peaks of the southeast highlands. Dispersal between such areas through the lowland humid Atlantic forest in recent times would be difficult, thus the ancestor of Balacha was probably distributed in southeast South America before the uplift of the mountain ranges, during the late Eocene or Oligocene. This event may have triggered speciation of some lineages of the genus by vicariance.

Notes on Neotropical Proconiini (Hemiptera: Cicadellidae: Cicadellinae): VII: First detailed description of the female genitalia of a Diestostemma species

Diestostemma Amyot & Serville, 1843 is a diverse sharpshooter genus with 32 species. A description and illustrations of Diestostemma nasutum Schmidt, 1910 are provided. The species, previously known from Ecuador, is newly recorded from Colombia. Both the male and female genitalia are described for the first time. This is the first detailed description of the female genitalia of a Diestostemma species. Diestostemma nasutum can be distinguished from the other species of the genus by the following features of the aedeagus: shaft with the distal third distinctly curved dorsally; base of basiventral aedeagal process with a lobe directed anteriorly; and basiventral aedeagal process bifurcated on its basal portion. The style of D. nasutum, whose apical portion is broad, distinctly curved inward, and with the apex subtruncate, is also quite distinctive. We compared the female genitalia of D. nasutum with those of other Proconiini genera. Our results confirm the perception that the female genitalia in this tribe can be a source of useful taxonomic characters.

Taxonomy and phylogeny of the leafhopper genus Scoposcartula (Insecta: Hemiptera: Cicadellidae)

Abstract A taxonomic study and a phylogenetic analysis of the neotropical genus Scoposcartula Young were carried out based on characters of the external morphology and male and female genitalia. A key to the species of the genus and descriptions of the species that were not treated in detail in recent taxonomic papers are provided. Tettigonia sistens Walker, 1858 was found to be a junior subjective synonym of Scoposcartula basimacula (Walker, 1851). Some peculiar characters of the female genitalia were described and included in the analysis, such as a transverse sclerotised line on pygofer, a structure on the base of the first valvulae of ovipositor (herein named prevalvifer area), and teeth of the second valvulae of ovipositor with two tips (cusps) and a posterior flat area. The phylogenetic analysis, based on 82 characters, yielded four equally most parsimonious trees that recovered a monophyletic Scoposcartula.

Description of the Aguatala compsa young (Hemiptera: Cicadellidae: Cicadellinae) female

The female of Aguatala compsa Young is for the first time described and illustrated based on specimens from Colombia. This consists also on a new distribution record for the monotypic genus Aguatala Young. The female genitalia of A. compsa are described in detail and compared with those of supposedly related genera belonging to the Erythrogonia generic group (sensu Young).

Phylogenetic analysis of the Abana group of genera (Hemiptera: Cicadellidae: Cicadellinae: Proconiini)

Abstract.  The Abana group sensu Mejdalani (2000) includes the genera Abana Distant, Acrobelus Stål, Acrogonia Stål, Deselvana Young, Omagua Melichar, Raphirhinus de LaPorte and Teletusa Distant. A comparative morphological study of these genera and six outgroup taxa yielded seventy‐four characters of the head, thorax, and male and female genitalia. The structures of the female genitalia, studied for the first time in a phylogenetic analysis of proconiine genera, provided informative characters for the analysis. A phylogenetic analysis conducted to estimate the relationships among these genera, using six outgroup genera, revealed eight equally most‐parsimonious trees. Goloboffs implied weights method resulted in two trees and successive weighting selected one of the original trees. The latter shows the following relationships for the genera: (Cicciana ((Acrogonia, Homalodisca) (Molomea, Tretogonia)) (Diestostemma (Desamera (Acrobelus ((Abana, Omagua) ((Raphirhinus (Deselvana sp., Deselvana ornata, Deselvana excavata)) (Deselvana dorsivitta, Teletusa))))))). The monophyly of the Abana group was not recovered, but a monophyletic group including Abana, Acrobelus, Deselvana, Omagua, Raphirhinus and Teletusa appeared in all eight trees. The genus Deselvana seems to be polyphyletic.

A new genus and species of Cicadellini (Hemiptera: Cicadellidae) from the Brazilian Atlantic Rainforest

The Neotropical sharpshooter Parasubrasaca felixi, gen. nov., sp. nov., is described and illustrated from the Atlantic Rainforest of Southeastern Brazil (state of Espirito Santo). The new genus can be distinguished from other members of the Cicadellini by several morphological features, including a unique modification of the basal portion of the aedeagus, which bears a conspicuous, ventrally directed projection that articulates with the connective. The projection bears a pair of strong spines directed posteriorly. In addition to the external morphology, color pattern, and male genitalia, the female genitalia of the new taxon are also described in detail. A discussion comparing the new genus with similar Neotropical taxa (Subrasaca Young, 1977, Soosiulus Young, 1977, Ramosulus Young, 1977, Geitogonalia Young, 1977, Ladoffa Young, 1977, and Scopogonalia Young, 1977) is provided.

Remarkable morphological features of taxonomic interest in the female genitalia of five Erythrogonia species (Hemiptera: Cicadomorpha: Cicadellidae)

The female genitalia of the Cicadellidae (leafhoppers) are usually considered more morphologically conservative (i.e., less variable) than the male genitalia at the generic and specific levels. However, various recent publications on the Cicadellinae (sharpshooters) have demonstrated the existence of useful characters in the female genitalia for the recognition of genera and species. Here we describe, illustrate, compare, and discuss peculiar processes, sclerites, and other features of the first pair of valvifers, sternite VIII, and ovipositor valvulae I and II of five species of the sharpshooter genus Erythrogonia (E. calva (Taschenberg, 1884), E. hertha Medler, 1963, E. phoenicea (Signoret, 1853), E. proterva Melichar, 1926, and E. sexguttata (Fabricius, 1803)). This genus includes currently the highest species diversity among the New World Cicadellinae, an agriculturally important subfamily. Comparative notes on other genera of the Cicadellini are added. In agreement with other recent publications, our results challenge the view that the morphology of the female genitalia is almost always conservative in the Cicadellidae.

Two new South American species of Acrobelus Stål (Hemiptera: Cicadellidae: Cicadellinae) with a key to the species of the genus

Two new leafhopper species of the Neotropical genus Acrobelus Stål, 1869 are described and illustrated: A. nessimiani sp. nov. from Peru (Amazonas Department) and A. rakitovi sp. nov. from Ecuador (Orellana Province). The two new species, distinguished from the other Acrobelus species by their remarkably long male subgenital plates and by the fusiform macrosetae present on these plates, seem to be closely related. A key to male specimens of the five known species of Acrobelus is provided. Taxonomic notes on the genus are included.

Two New Species of Coronigoniella Young from Brazil with Taxonomic and Distributional Notes on the Genus (Hemiptera: Cicadellidae: Cicadellinae)

Two new species of Coronigoniella Young are described and illustrated: C. osborni, sp. n., from SE. and S. Brazil (Espírito Santo, Minas Gerais, Rio de Janeiro, and Paraná states), and C. formosa, sp. n., from central W. and SE. Brazil (Goiás and Minas Gerais states, and the Distrito Federal). The presence of a sclerotized plate from the abdominal sternum VIII is reported in females of Coronigoniella for the first time. Taxonomic and morphological notes are given for C. spinosa (Osborn) based on specimens from its type-locality in Mato Grosso State. Tettigonia ruficaput (Walker), a species from Colombia previously considered of uncertain taxonomic position, is transferred to Coronigoniella. Possible host plants of C. osborni, sp. n. are Coleus sp. (Lamiaceae), Symphytum sp. (Boraginaceae), and Vernonia sp. (Asteraceae). The genus Coronigoniella is newly recorded from Alagoas, Bahia, Espírito Santo, Goiás, Minas Gerais, Paraná, and São Paulo states, as well as from the Distrito Federal, Brazil. A map showing the known geographic distribution of the two new species is presented. Resumo Duas novas espécies de Coronigoniella Young são descritas e ilustradas: C. osborni, sp. n., do sudeste e sul do Brasil (estados do Espírito Santo, Minas Gerais, Rio de Janeiro e Paraná), e C. formosa, sp. n., do centro-oeste e sudeste do Brasil (estados de Goiás e Minas Gerais, assim como o Distrito Federal). A presença de uma placa esclerosada do esterno abdominal VIII é registrada em fêmeas de Coronigoniella pela primeira vez. Notas taxonômicas e morfológicas sobre C. spinosa (Osborn) são fornecidas, com base em espécimes provenientes da sua localidade-tipo no Estado do Mato Grosso. Tettigonia ruficaput (Walker), uma espécie da Colômbia anteriormente considerada como de posição taxonômica incerta, é transferida para Coronigoniella. Coleus sp. (Lamiaceae), Symphytum sp. (Boraginaceae) e Vernonia sp. (Asteraceae) são possíveis plantas hospedeiras de C. osborni, sp. n. O gênero Coronigoniella é pela primeira vez registrado nos estados de Alagoas, Bahia, Espírito Santo, Goiás, Minas Gerais, Paraná e São Paulo, assim como no Distrito Federal, Brasil. Um mapa mostrando a distribuição geográfica conhecida das duas novas espécies é apresentado.

Scoposcartula Young: descrições de uma espécie nova e da fêmea de S. Flavovittata Mejdalani, e redescrição de S. Concinna (Perty) comb.n. (Homoptera, Cicadellidae, Cicadellini)

Scoposcartula tobiasi sp.n. is described from the states of Rio de Janeiro, Minas Gerais, and Sao Paulo, southeastern Brazil. The previously unknown female of Scoposcartula flavovittata Mejdalani, 1992 is described from the state of Rio de Janeiro. Tettigonia concinna Perty, 1833 is transferred to Scoposcartula Young, 1977 based on a male from the state of Bahia, northeastern Brazil.