Relações filogenéticas em diplotaxini e revisão taxonômica das espécies brasileiras de Liogenys Guérin-Méneville, 1831 (Coleoptera : Melolonthidae)

Orientadora : Profª. Drª. Lúcia Massutti de AlmeidaCo-orientador : Prof. Dr. Miguel Ángel MorónCo-orientador : Prof. Dr. Fernando Zagury Vaz-de-MelloTese (doutorado) - Universidade Federal do Paraná, Setor de Ciências Biológicas, Programa de Pós-Graduação em Ciências Biológicas (Entomologia). Defesa: Curitiba, 24/02/2015Inclui referênciasÁrea de concentração : EntomologiaResumo: Diplotaxini Kirby é uma das 29 tribos de Melolonthinae, composta por 709 espécies descritas em 21 gêneros distribuídas nas regiões Neotropical, Neártica, Afrotropical e Oriental. Até o momento não foram realizados estudos de filogenia da tribo. Liogenys Guérin-Méneville é o maior gênero dos Diplotaxini neotropicais, composto por 78 espécies distribuídas do Panamá até o sul da América do Sul. Este trabalho teve por objetivos avaliar a monofilia de Diplotaxini e propor uma hipótese de relacionamento filogenético para os gêneros que a compõem, com foco em Liogenys; revisar taxonomicamente este gênero e redescrever as espécies brasileiras. Para a reconstrução filogenética da tribo e conhecimento da posição sistemática dos gêneros, em especial de Liogenys, foram utilizados 167 caracteres morfológicos e 83 taxa terminais (12 do grupo externo e 71 do grupo interno). Em ambas as análises de pesagem igual e implícita dos caracteres, Diplotaxini se mostrou polifilético. A monofilia da tribo pode ser recuperada retirando-se: Empecta Erichson, Clypeasta Fairmaire (próximos de Melolontha melolontha (Linnaeus)) e Pseudoliogenys Moser (agrupado em Tanyproctini Erichson). As análises suportam a polifilia de Liogenys, que pode ser recuperada mediante a retirada de L. ferrugata Mannerheim (próxima de Melolonthini Samouelle) e L. micropyga Burmeister (Diplotaxis) e a inclusão de Homoliogenys tarsalis (Moser) e Hilarianus anguliceps Blanchard (Syn. Nov. de Liogenys punctaticollis Blanchard). As quatro espécies de Hilarianus restantes agruparam-se em Sericoidini. São apresentadas chaves de identificação de adultos para alguns gêneros de Diplotaxini, incluindo todos os gêneros neotropicais e alguns não neotropicais (Diplotaxis Kirby e Apogonia Kirby) e para as espécies brasileiras de Liogenys. Liogenys foi revisado taxonomicamente, redefinido e redescrito. Homoliogenys Gutiérrez e Hilarianus Blanchard são propostos como novos sinônimos de Liogenys. Foram designados 19 lectótipos e propostas seis novas sinonímias, uma revalidação e uma recombinação. Todas as espécies brasileiras (23) foram redescritas e ilustradas: L. tarsalis Moser Comb. Nov., L sinuaticeps Moser, L. unicolor Evans, L. diodon Burmeister, L. bilobata Frey, L santaecrucis Blanchard, L. bidenticeps Moser, L. acutidens Moser, L. tibialis Moser Stat. Rest., L. punctaticollis (Blanchard), L. testaceipennis Moser, L. spiniventris Moser, L. elegans Nonfried, L. suturalis (Blanchard), L. moseri Frey, L. pilosipennis Moser, L. hirtipennis Frey, L. laminiceps Moser, L. corumbana Moser, L. fusca Blanchard, L. pallidicornis Blanchard, L. bidentata Burmeister e L. concolor Blanchard. Dezenove espécies de Liogenys brasileiras tiveram seus registros de ocorrência expandidos. Palavras-chave: Cladística, descrição, morfologia, Neotropical, Scarabaeoidea, sistemática.Diplotaxini Kirby, 1837 is one of the 29 Melolonthinae tribes, with 708 described species belonging to 21 genera distributed on Neotropical, Neartic, Afrotropical and Oriental regions. Until now no phylogeny studies of the tribe were made. Liogenys Guérin-Méneville, 1831 is the largest genus of Neotropical Diplotaxini, composed by 78 species distributed from Panama to southern South America. This study aimed to evaluate the monophyly of Diplotaxini and to generate phylogenetic relationship hypothesis among the genera, focusing on Liogenys; to review this genus and to redescribe Brazilian species. To reconstruct the tribe phylogeny and to test the systematic position of Diplotaxini genera, in special of Liogenys, 167 morphological characters and 83 terminal taxa (12 outgroups and 71 ingroups) were used. Diplotaxini is poliphyletic in both equal and implicit weighting character analysis. The monophyly of the tribe can be recovered removing: Empecta Erichson, Clypeasta Fairmaire (close to Melolontha melolontha (Linnaeus)) and Pseudoliogenys Moser (close to Tanyproctini Erichson). The results support the poliphyly of Liogenys, monophyly is recovered removing L. ferrugata Mannerheim (close to Melolonthini) and L. micropyga Burmeister (Diplotaxis) and including Homoliogenys tarsalis Moser and Hilarianus anguliceps Blanchard (Syn Nov. of Liogenys punctaticollis Blanchard). The remaining four Hilarianus were related to Sericoidini. Adult identification keys to some Diplotaxini are presented, including all Neotropical genera and some non-Neotropical (Diplotaxis Kirby and Apogonia Kirby) and to the Brazilian Liogenys. Liogenys was reviewed, redefined and redescribed. Homoliogenys Gutiérrez and Hilarianus Blanchard were proposed as new synonyms. Nineteen lectotypes were designate; six new synonyms, one revalidation and one recombination were proposed. All Brazilian species (23) were redescribed and illustrated: L. tarsalis Moser Comb. Nov., L sinuaticeps Moser, L. unicolor Evans, L. diodon Burmeister, L. bilobata Frey, L santaecrucis Blanchard, L. bidenticeps Moser, L. acutidens Moser, L. tibialis Moser Stat. Rest., L. punctaticollis (Blanchard), L. testaceipennis Moser, L. spiniventris Moser, L. elegans Nonfried, L. suturalis (Blanchard), L. moseri Frey, L. pilosipennis Moser, L. hirtipennis Frey, L. laminiceps Moser, L. corumbana Moser, L. fusca Blanchard, L. pallidicornis Blanchard, L. bidentata Burmeister and L. concolor. Nineteen species of Liogenys for Brazil had their distribution records expanded. Key-words: Cladistics, description, morphology, Neotropical, Scarabaeoidea, systematics

Biological and morphological aspects of Plectris aliena (Coleoptera: Melolonthidae) in sugarcane in Brazil

Plectris aliena (Coleoptera, Melolonthidae) Chapin is a species already recorded causing serious damage to various cultures in North America and Australia. Although its occurrence has recently been reported in Brazil, information about its distribution, taxonomy, and biology is limited. Thus, this study aims to report this new occurrence of P. aliena in Deodápolis (Mato Grosso do Sul, Brazil), as well as to present bioecological and morphological aspects of this species. In this way, the seasonal distribution and the life cycle was studied in the years 2017 and 2018. The larvae were sampled through trenches made in the soil and reared in the laboratory. Adults were captured using “Luiz de Queiroz” light traps. Adults have body with dense white hairs, antennae with 10 antenomeres; they measure approximately 12 mm in length, and their antennal lamellae are larger for males than females. The larvae reach 30 mm in length in the third stage and pupae show about 19 mm in length. The life cycle of this species is univoltine. Due to the great diversity of Plectris and the scarce information available about this species in South America, this study will facilitate its identification in the field and indicate the best time for monitoring in sugarcane crop

Biological and morphological aspects of Plectris aliena (Coleoptera: Melolonthidae) in sugarcane in Brazil

Plectris aliena (Coleoptera, Melolonthidae) Chapin is a species already recorded causing serious damage to various cultures in North America and Australia. Although its occurrence has recently been reported in Brazil, information about its distribution, taxonomy, and biology is limited. Thus, this study aims to report this new occurrence of P. aliena in Deodápolis (Mato Grosso do Sul, Brazil), as well as to present bioecological and morphological aspects of this species. In this way, the seasonal distribution and the life cycle was studied in the years 2017 and 2018. The larvae were sampled through trenches made in the soil and reared in the laboratory. Adults were captured using “Luiz de Queiroz” light traps. Adults have body with dense white hairs, antennae with 10 antenomeres; they measure approximately 12 mm in length, and their antennal lamellae are larger for males than females. The larvae reach 30 mm in length in the third stage and pupae show about 19 mm in length. The life cycle of this species is univoltine. Due to the great diversity of Plectris and the scarce information available about this species in South America, this study will facilitate its identification in the field and indicate the best time for monitoring in sugarcane crop

A look beyond the colour: taxonomic revision of Coilodes Westwood, 1846 (Coleoptera, Hybosoridae), with the description of six new species

Coilodes Westwood, 1846 is a Neotropical genus of Hybosorinae. Despite being a morphologically homogeneous genus, it presents a great deal of intraspecific variation, especially with reference to the colour of integuments. This makes identification of species even more difficult, since the majority of original descriptions present the colour as the main diagnostic character. To solve this problem, the first taxonomic revision of Coilodes is presented. The genus now comprises 13 species. Redescriptions of C. castaneus Westwood, 1846, C. fumipennis Arrow, 1909, C. humeralis (Mannerheim, 1829), C. niger (Mannerheim, 1829), C. ovalis Robinson, 1948, C. parvulus Westwood, 1846, and C. punctipennis Arrow, 1909 are presented. Coilodes niger (Mannerheim, 1829) has its status revalidated and three new synonyms are proposed: C. gibbus (Perty, 1830) and C. chilensis Westwood, 1846 with C. humeralis, and C. nigripennis Arrow, 1903 with C. castaneus. Biological and geographical distribution data are expanded. Lectotypes are designated for C. humeralis and C. niger. Six new species are described: C. bezerrai Basílio & Vaz-de-Mello sp. nov., C. edeiltae Basílio & Vaz-de-Mello sp. nov., C. lunae Basílio & Vaz-de-Mello sp. nov., C. mayae Basílio & Vaz-de-Mello sp. nov., C. ravii Basílio & Vaz-de-Mello sp. nov., and C. skelleyi Basílio & Vaz-de-Mello sp. nov. An identification key for the males of the species is presented

Ovomanonychus, a new genus of South American Sericoidini (Coleoptera Scarabaeidae: Melolonthinae)

Costa, Fábio Correia, Cherman, Mariana Alejandra, Iannuzzi, Luciana (2020): Ovomanonychus, a new genus of South American Sericoidini (Coleoptera Scarabaeidae: Melolonthinae). Zootaxa 4759 (1): 65-76, DOI: https://doi.org/10.11646/zootaxa.4759.1.

First report of Liogenys suturalis (Blanchard) (Coleoptera: Scarabaeidae: Melolonthinae) in Argentinian crops and the first report of damage on soybean

Liogenys Guérin-Méneville is one of the most species rich genera in the Scarabaeidae family endemic to South America. Some species of this genus are important root-feeding pests of maize, soybean, wheat and oat in their larval stage. Prior to the present study, all known reports of damage caused by any Liogenys species were from Brazil. Since 2006 in Argentina white grubs of the genus Liogenys (not previsouly identified to species level) have been recorded causing a decrease in soybean yields. This research confirms that the Argentinian species is L. suturalis (Blanchard), an important pest already recorded in Brazil but associated with yield losses of maize crops instead of soybean. Taxonomical and biological data observed in Argentinian populations are presented. This is the first record of L. suturalis damaging soybean and its first report in Argentinian crops.Fil: Cherman, Mariana Alejandra. Universidade Federal de Mato Grosso; BrasilFil: Mojica, Noelia. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Fava, Fernando Daniel. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: del Valle, Eleodoro Eduardo. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Instituto de Ciencias Agropecuarias del Litoral. - Universidad Nacional del Litoral. Instituto de Ciencias Agropecuarias del Litoral.; Argentina. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentin

Liogenys pallens Blanchard 1851

<i>Liogenys pallens</i> Blanchard, 1851 <p>Figs. 17; 25.</p> <p> <i>Liogenys pallens</i> Blanchard, 1851: 167; Lacordaire 1855: 269 (revision, systematics); Harold 1869: 1140 (checklist); Bruch 1911: 200 (checklist); Dalla Torre 1913: 318 (checklist); Blackwelder 1944: 227 (checklist); Frey 1969: 49, 61 (key, redescription); Krajčík 2012: 145 (checklist); Evans 2003: 212 (checklist); Evans & Smith 2009: 180 (checklist).</p> <p> <i>Liogenys fulvescens</i> Blanchard, 1851: 167; Lacordaire 1855: 269 (revision, systematics); Harold 1869: 1140 (checklist); Dalla Torre 1913: 318 (checklist); Blackwelder 1944: 227 (checklist); Frey 1969: 50, 61 (key, redescription); Evans 2003: 209 (checklist); Evans & Smith 2009: 178 (checklist); Krajčík 2012: 145 (checklist) <b>New synonym.</b></p> <p> <i>Liogenys flavicollis</i> Frey, 1964: 693; Frey 1969: 40 (key); Evans 2003: 209 (checklist); Evans & Smith 2009: 177 (checklist); Krajčík 2012: 144 (checklist). <b>New synonym.</b></p> <p> <b>Type material</b>. <i>Liogenys pallens</i> male lectotype <b>here designated</b> (MNHN): [white handwritten] “ Montevideo. / 7 bre 8 bre / 1820.”, [light green, typeset and handwritten] “MUSÉUM PARIS / Montevideo ”, [green handwritten] “ L. pallens / Cat. Mus. / Montevideo / M. A. St Hilaire. ”, [red typeset] “ SYNTYPE ”, [white, outlined red, typeset] “ LECTOTYPE / Liogenys pallens / Blanchard, 1851 / Cherman M. A. 2015”, genitalia mounted.</p> <p> <i>Liogenys fulvescens</i> female lectotype <b>here designated</b> (MNHN): [white handwritten] “ Montevideo. / 7 bre 8 bre / 1820.”, [light green, typeset and handwritten] “MUSÉUM PARIS / Montevideo ”, [green handwritten] “ L. fulvescens / Cat. Mus. / Montevideo / M. A. St Hilaire.”, [red typeset] “ SYNTYPE ”, [white, outlined red, typeset] “ LECTOTYPE / Liogenys fulvescens / Blanchard, 1851 / Cherman M. A. 2015”. Paralectotype (1): One female (MNHN) with the labels: [white handwritten] “Del’emb. / del’uruguay / jusqu’aux / missions”, [light green typeset] “MUSÉUM PARIS”, [red typeset] “ SYNTYPE ”, [white, outlined red, typeset] “ PARALECTOTYPE / Liogenys fulvescens / Blanchard, 1851 / Cherman M. A. 2015”.</p> <p> <i>Liogenys flavicollis</i> female holotype (NHMB): [white typeset] “ ♀ ”, [white handwritten] “ Formosa / Gran Guardia / XI.52”, [red typeset] “TYPE”, [white handwritten] “ Typus ♀ / Liogenys flavicollis / n. sp. / [typeset] det. G. Frey 1964 ”. Paratypes (2): One female with the same label as the holotype (NHMB). One female with the labels: [white handwritten] “ Formosa / Gran Guardia / XI.52”, [red typeset] “TYPE”, [white handwritten] “Typus F / Liogenys flavicollis / n. sp. / [typeset] det. G. Frey 1964 ”, [white typeset] “H. & A. HOWDEN / COLLECTION / ex. A. Martínez coll.”, [white typeset] “Canadian Museum of / Musée Canadian de la / NATURE / CMNEN 00018922” (CMNC).</p> <p> <b>Non-type material</b> (79). Without country locality, date, and collector, 2 females (ZMHB). PARAGUAY: Asunción, IX.1952, M. Alvarenga, 3 females (DZUP). ARGENTINA: without locality: Stempelm, 3 females (MZSP); Kraatz, 1 male and 5 females (SDEI); Formosa: Clorinda, 26.IX.1937, without collector, 2 males (MLPA); Chaco: Antequera, Departamento Primero de Mayo, 27°26.500’S 58°51.459’W, 52 m, 22.XII.2014, M. Ibarra Polesel, 1 specimen; Estación San Francisco, Departamento San Fernando, 27°30’35.90’’S 59° 4’47.60’’W, 54 m, 16– 17.X.2013, M. Ibarra Polesel, 1 specimen (CARTROUNNE); Santiago del Estero: without locality, E.R. Wagner, 1 female (MLPA); 7.XI.1963, Cartwright, 1 female (NHMB); Girardet, without date and collector, 1 male (MLPA); Choya, 27.XI.1962, without collector, 1 male (NHMB); Catamarca: without locality, date, and collector, 1 male (MLPA); La Rioja: 20 km N La Rioja, 25.IX.1968, without collector, 5 males and 1 female (AMNH), Córdoba: without locality, date, and collector, 3 males and 6 females (ZMHB); without locality, date, and collector, 2 females (MLPA); Córdoba, 10.XI.1903, C. Bruch, 1 male (ZMHB); San Luis: Potrero de los Funes, 20.XII.2012, M.A. Cherman, 1 female (DZUP); El Milagro, Ayacucho, XI.1966, A. Martínez, 1 female (CMNC); Mendoza: without locality, date, and collector, 5 males and 11 females. (ZMHB), without date, Jensen-Haarup, 1 female (ZMUC); Pedregal Railway Station, El Pedregal, Maipú, without date, Jensen-Haarup, 6 males and 8 females (ZMUC); Santa Rosa Railway Station, Santa Rosa, Jensen-Haarup, 1 female (ZMUC); Santa Rosa, Ñancuñan, 33º50’81.5’’S 67º53’71.7’’W, 5.I. 2005, 540 m, E. Ruiz, 1 male (IADIZA); Santa Rosa, Ñancuñan, 34°2’57.840’’S 67° 58’0.480’’W, 11.II.1982, S. Claver & S. Roig, 1 male (IADIZA); La Pampa: Santa Rosa, XI.1961, Daguerre, 1 female (NHMB); (1) Buenos Aires: La Plata, without date and collector, 1 female (ZMHB).</p> <p> <b>Diagnosis</b>. Length: 12.0– 15.5 mm; width 5.7–7.3 mm. Body elongate, dull yellow, more uniform in color in males (Fig. 17A) than in females (Fig. 17 B–C) semi-opaque to shiny, head and base of elytra darker; distance between eyes twice as wide as one eye in males, wider in females; clypeus in males long, clypeal emargination shallow, rounded, almost straight, wider than the frons; outer sides of anterior teeth parallel; outer margin of anterior teeth shorter than the eye; clypeal lateral margin convex, projection sharp or blunt; distance between clypeal lateral projection and anterior margin of eye as long as one eye; distance between clypeal lateral projection and the adjacent anterior tooth equal to the basal width of the anterior tooth; obtuse angle between outer side of anterior teeth and clypeal lateral projection; in females, clypeal emargination deep, rounded, wide; outer sides of anterior teeth parallel; outer margin of anterior teeth shorter than the eye; clypeal lateral margin convex, projection sharp; distance between clypeal lateral projection and anterior margin of eye longer than one eye; distance between clypeal lateral projection and the adjacent anterior tooth equal to or longer than the basal width of the anterior tooth; right angle between outer side of anterior teeth and clypeal lateral projection; antenna with 10 antennomeres; pronotal posterior corners rounded; scutellum ogival, finely punctate throughout; three dark protibial teeth, middle and apical equally large; distance between basal and middle teeth longer than between middle and apical; mesotibia cylindrical in cross section, with two transversal carinae, the apical carina incomplete in males, complete in females; inner margin of male metatibia not carinate; two metatibial transverse carina present posteriorly; metatarsomere I shorter than metatarsomere II; in males protarsomeres and mesotarsomeres I to IV strongly enlarged; claw bifid, symmetrical, inferior tooth strongly reduced; pygidium convex, pygidial disc glabrous or slightly with bristles on apex, finely punctate, coarser in females; pygidial apex rounded (Fig. 17H); parameres, basal region equal in width to the parameres at the midline; parameral split at the apical third; inner margins of parameres straight; parameres narrower subapically; apex strongly bent downwards, ventral surface expanded laterally forming an acute angle (Fig. 17I); parameres in lateral view straight, not coplanar (Fig. 17J).</p> <p> <b>Type locality</b>. <i>Liogenys pallens</i> and <i>L. fulvescens</i>: URUGUAY, Montevideo; <i>L. flavicollis</i>: ARGENTINA, Formosa, Gran Guardia.</p> <p> <b>Geographical distribution</b>. <b>PARAGUAY</b> (Asunción); ARGENTINA (Formosa, <b>Chaco</b>, Santiago del Estero, <b>Catamarca</b>, <b>La Rioja</b>, <b>Córdoba</b>, <b>San Luis</b>, <b>Mendoza</b>, <b>La Pampa</b>, <b>Buenos Aires</b>); URUGUAY (Montevideo).</p> <p> <b>Remarks</b>. Frey (1969) designated a neotype for <i>L. pallens</i>, which is housed at the NHMB. As we found the primary type of Blanchard (1851) at the MNHN (Fig. 17A, D), the former must be invalidated (Article 75.8, International Commission on Zoological Nomenclature 1999). Despite Blanchard (1851) mentioned a range of length in <i>L. pallens</i> description, we found a single type specimen, which is here designated as the lectotype. This species has a strong sexual dimorphism and many characters vary within its distribution. A large series with males and females from the same collection event from Mendoza (Argentina) allowed the association of males and females. After comparing the male lectotype of <i>L. pallens</i>, the female lectotype of <i>L. fulvescens</i> (Fig. 17B, E) and the female holotype of <i>L. flavicollis</i> (Fig. 17C, F), we propose that both latter names are <b>synonyms</b> of <i>L. pallens</i>.</p>Published as part of <i>Cherman, Mariana Alejandra, Basílio, Daniel Silva, Mise, Kleber Makoto, Frisch, Johannes & Almeida, Lúcia Massutti De, 2021, Liogenys Guérin-Méneville, 1831 (Coleoptera: Scarabaeidae: Melolonthinae Diplotaxini) from the Chacoan Province and its boundaries: taxonomic overview with four new species, pp. 1-59 in Zootaxa 4938 (1)</i> on pages 39-41, DOI: 10.11646/zootaxa.4938.1.1, <a href="http://zenodo.org/record/4561258">http://zenodo.org/record/4561258</a&gt

Liogenys vicina Frey 1969

<i>Liogenys vicina</i> Frey, 1969 <p>Figs. 22; 26.</p> <p> <i>Liogenys vicinus</i> Frey, 1969: 62, 51 (key); Krajčík 2012: 145 (checklist); Cherman <i>et al</i>. 2017: 5 (generic history).</p> <p> <i>Liogenys vicina</i>: Evans 2003: 215 (checklist); Evans & Smith 2009: 183 (checklist); Cherman <i>et al.</i> 2017: 20 (natural history).</p> <p> <b>Type material</b>. <i>Liogenys vicinus</i> male holotype (USNM): [white handwritten] “Formosa / Clorinda / 8.XI.950. Daguerre”, [red, typeset and handwritten] “Type No / 74010 / USNM”, [red typeset] “TYPUS”, [white, typeset and handwritten] “ Liogenys / vicinus / n.sp. / Type / det. G Frey, 1968”, [pink typeset] “Property / USNM”, [white typeset] “Loan from / USNMNH / 2065060”, genitalia mounted. Paratypes (2): One female (NHMB) [white handwritten] “ Formosa / P. Pilcomayo ”, [white typeset] “ ♀ ”, [red typeset] “ PARATYPE ”, [white, typeset and handwritten] “ Liogenys / vicinus / n.sp. / det. G. Frey, 1968”. One male (NHMB) [white typeset] “ Argentina / Formosa / Cindad XII.1949 / A. Martinez leg.”, [red typeset] “ PARATYPE ”, [white, typeset and handwritten] “ Liogenys / vicinus / n.sp. / det. G. Frey, 1968”, genitalia mounted.</p> <p> <b>Non-type material</b> (9). ARGENTINA. Formosa: Laguna Yema: Centro de Validación-(CEDEVA), barrio CEDEVA, 24º16’03’’S 61º14’54’’W, 163 m, 14.XII.2008, F.C. Ocampo, G. San Blas, & F. Campon, 1 male (IADIZA); Reserva de Biósfera Teuquito, Ruta Provincial 37, 1 km S “Canal”, 24º21’20,95’’S 61º18’55,23’’W, 11.XII.2008, 1 male and 1 female (IADIZA); Chaco: Fuerte Esperanza, XI.1978, A. Martínez & Fritz, 2 males and 2 females (CMNC); Santiago del Estero: without locality, II.1960, without collector, 1 male and 1 female (IADIZA).</p> <p> <b>Diagnosis</b>. Length 10.8–11.9 mm; width: 4.8–5.9 mm. Body elongate, brown to dark brown, shiny; coarsely punctate (Fig. 22A); clypeal emargination deep but not reaching the base of the teeth, rounded and narrowed; clypeal lateral margin strongly convex and produced, forming a tooth-like projection; pronotal posterior corners subangulate to rounded (Fig. 22B); antennae with 10 antennomeres; first two pair of elytral ridges equally defined and more noticeable than the other two; basal apophysis of metacoxa produced; metafemur with bristles, sometimes abundantly; metatibia not carinate along the inner margin; pygidium convex, wider than it is long; pygidial width wider than the distance between spiracles of propygidium, disc with bristles throughout, erect bristles (Fig. 22D); in males protarsomeres and mesotarsomeres strongly enlarged, metatarsomeres slightly enlarged; parameres strongly expanded at the midline and abruptly narrowed at the apex (Fig. 22E, F); parameres strongly convex in lateral view (Fig. 22G).</p> <p> <b>Geographical distribution</b>. ARGENTINA (Formosa, <b>Chaco</b>, <b>Santiago del Estero</b>).</p> <p> <b>Remarks</b>. <i>Liogenys vicina</i> resembles the sympatric <i>L. latitarsis</i> (Fig. 10), and these similarities difficult their identification. <i>Liogenys vicina</i> differs from <i>L. latitarsis</i> (in parenthesis) in the punctures on pronotum and elytra coarser; clypeal emargination slightly narrower, lateral margins of pronotum slightly rounder, elytral inner ridges evenly elevated (sometimes the second ridge less elevated), metafemur more with bristles; and in the shape of parameres inflated basally and abruptly narrowed at the apex (not inflated basally and apical constriction absent).</p>Published as part of <i>Cherman, Mariana Alejandra, Basílio, Daniel Silva, Mise, Kleber Makoto, Frisch, Johannes & Almeida, Lúcia Massutti De, 2021, Liogenys Guérin-Méneville, 1831 (Coleoptera: Scarabaeidae: Melolonthinae Diplotaxini) from the Chacoan Province and its boundaries: taxonomic overview with four new species, pp. 1-59 in Zootaxa 4938 (1)</i> on page 50, DOI: 10.11646/zootaxa.4938.1.1, <a href="http://zenodo.org/record/4561258">http://zenodo.org/record/4561258</a&gt