Liogenys obscura Blanchard, 1851

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, Zootaxa 4938 (1), pp. 1-59 : 33-36

Liogenys obscura Blanchard, 1851

Figs. 15 ; 24 .

Liogenys obscurus Blanchard, 1851: 167 ; Lacordaire 1855: 269 (systematics); Harold 1869: 1140 (checklist); Steinheil 1874: 557 (checklist); Kolbe 1907: 5 (checklist); Bruch 1911: 200 (checklist); Dalla Torre 1913: 318 (checklist); Frey 1969: 43 (key); Krajčík 2012: 145 (checklist).

Liogenys obscura: Blackwelder 1944: 227 (checklist); Evans 2003: 211 (checklist); Evans & Smith 2009: 180 (checklist).

Liogenys bruchi Moser, 1924: 122 ; Blackwelder 1944: 227 (checklist); Frey 1969: 58 (synonymy).

Type material. Liogenys obscurus female lectotype here designated ( MNHN): [green handwritten] “ L. obscurus / Cat. Mus. / Rio negro (Patagonie) / M. D’ Orbigny”; [white handwritten] “6049 / 34”, [white handwritten] “1050”, [light green typeset and handwritten] “MUSÉUM PARIS / Chiquitos d’Orbigny”, [white, outlined black, typeset] “Southern Neotropical Scarabs / database # AS 2615205 / Liogenys obscura / Blanchard, 1851 ♀ / DET: A.B.T.SMITH 2008”, [red, outlined black, typeset and handwritten] “ LIOGENYS / OBSCURA / BLANCHARD, 1851 / LECTOTYPE / Des. Cherman M. A. Paralectotypes (2): one female ( MNHN): [white handwritten] “6049 / 34”, [white typeset] “MUSEUM PARIS / PATAGONIE / (PATAGONES) / D’ORBIGNY 1834”, [white, outlined black, handwritten and typeset] “ Liogenys / obscurus / DET. / L. W. SAYLOR”, [white, outlined black, typeset] “Southern Neotropical Scarabs / database # AS 2615206 / Liogenys obscura / Blanchard, 1851 ♀ / DET: A.B.T.SMITH 2008”; one female ( MNHN): [white handwritten] “6049 / 34”, [white typeset and handwritten] “MUSÉUM PARIS / Chiquilos / d’Orbigny”, [white, outlined black, typeset] “Southern Neotropical Scarabs / database # AS 2615207 / Liogenys obscura / Blanchard, 1851 ♀ / DET: A.B.T.SMITH 2008”.

Liogenys bruchi Moser male lectotype here designated: [white handwritten] “ Liogenys / bruchi / Moser / Typen”, [white, typeset and handwritten] “Alta Gracia La Granja / Sierras de Córdoba / IX.922 [typeset] C. Bruch Leg”, [white, typeset and handwritten] “ Liogenys / obscurus Bl / det. G. Frey, 1968”, [red typeset] “Typus” ( ZMHB), [white, outlined red, typeset] “ LECTOTYPE / Liogenys bruchi / Moser, 1924 / des. M. A. Cherman” ( ZMHB). Paralectotypes (2): one male ( MACN): [white, typeset and handwritten] “Alta Gracia La Granja / Sierras de Córdoba / XII.921 / C. Bruch Leg.”, [red handwritten] “ Liogenys / bruchi / Moser 1924 / Syntypus?”, [green typeset] “Typus”, [white handwritten] “FICHADO”, [white, outlined black, typeset] “MACN–En / 952”, [white, outlined red, typeset] “ PARALECTOTYPE / Liogenys bruchi / Moser, 1924 / Des. M. A. Cherman”. One male ( MACN): [white, typeset and handwritten] “Alta Gracia La Granja / Sierras de Córdoba I.922 / C. Bruch Leg”, [red handwritten] “ Liogenys / bruchi / Moser 1924 / Syntypus?”, [green typeset] “Cotypus”, [white handwritten] “FICHADO”, [white, outlined black, typeset] “MACN –En / 953”, [white, outlined red, typeset] “ PARALECTOTYPE / Liogenys bruchi / Moser, 1924 / Des. M. A. Cherman”.

Non-type material (65). ARGENTINA. Without locality and collector, 1944, 1 female ( MZSP) ; Catamarca: Anacasti , 18.XII. 2009, 573 m, 28º52’57’’S 65º25’04’’W, Ocampo, Dominguez, & Campon, 1 male and 2 females ( IADIZA) ; Pomán ( Camping ), 7.XII.2013, Arriagada & Castillo, 1 female ( CMVD) ; Santiago del Estero: Río Salado, without date, E.R. Wagner, 1 male ( MZUC) ; Córdoba: Cruz del Eje (4 km NE), 20.II.1982, A. Martínez, 3 males and 20 females ( CMNC) ; Capilla del Monte. Punilla , 21.XI.1965, A. Martínez, 1 male and 1 female ( CMNC) ; 3.XII.1997, G. Arriagada, 2 males and 2 females ( CMVD) ; Diquecito , II.1977, A. Martínez, 1 male ( CMNC) ; Diquecito. El Sauce , XII.1964, A. Martínez, 3 males ( MZSP) ; Río Cuarto (45 mi N), 11.VII.1951, Ross & Michelbacher, 1 male ( MZSP) ; without date, Bremer, 2 females ( ZMHB) ; San Vicente , without date, Frenzel, 1 female ( ZMHB) ; San Luis: La Toma, km 73, Toll Autopista El Saladillo , 33,0715633ºS 65,654522ºW, 23.XII.2012, M.A. Cherman, 2 females ( DZUP) ; Desaguadero , 15.I.2001, J. Jensen, 2 females ( CMVD) ; Quines , 24.XI.1995, Roig & Flores, 2 males and 1 female ( IADIZA) ; El Molle. Departamento Belgrano , 33º02’22.8’’S 66º30’47.6’’W, 7.II. 2017, 622 m, G. Arriagada, 1 male and 7 females ( CEMT) ; Mendoza: Telteca. Lavalle , 32º22’59.58’’S 68º03’14.16’’W, 5.II. 2008, 548 m, Ocampo, Ruiz, & San Blas, 1 female ( IADIZA) ; Buenos Aires: Solá , II.1961, A. Martínez, 1 female ( MZSP) ; Base Naval Puerto Belgrano, Punta Alta , [38.883333ºS, 62.083333ºW], 2.II.1938, Biraben & Scott, 3 males and 3 females ( MLPA) ; “ Patagonia ”: without date, Guerin, 1 female ( ZMUC) . URUGUAY. Colonia: Carmelo, without date, M. Palmer, 1 female ( CMNC) ; Montevideo: Montevideo, without date and collector, 1 female ( CMNC) .

Diagnosis. Length: 10.9–11.6 mm; width: 5.5–6.2 mm. Dark brown, shiny, pronotum and elytra unicolored; head and pronotum coarsely and densely punctate ( Fig. 15B ); distance between eyes more than three times the width of one eye; frons swollen and somewhat scaly; clypeal emargination deep, wide and rounded in males, more angulate in females; outer sides of anterior teeth parallel, subparallel in females; outer margin of anterior teeth shorter than the eye; clypeal lateral margin convex, blunt projection, in males sharper ( Fig. 15E ); 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 the basal width of the anterior tooth; in females obtuse angle between outer side of anterior teeth and clypeal lateral projection ( Fig. 15A ); in males angle obtuse or straight; antenna with 10 antennomeres; pronotal posterior corners rounded; scaly at the insertion with the pterothorax; scutellum rounded to ogival; mesepisternum, sides of metaventrite and metacoxae scaly abundantly ( Fig. 15F ); three protibial teeth, distance between basal and middle teeth slightly longer than between middle and apical; mesotibia quadrate to subquadrate in cross section, two transverse carinae, the apical one incomplete in males, complete in females; metatibial transverse carina present posteriorly; metatarsomere I one half the length of metatarsomere II and equal in width; in males pro and mesotarsomeres I to IV equally enlarged, protarsomere II as wide as it is long; claw bifid, symmetrical, superior tooth of a claw longer than the inferior; band of abundant scales beneath the outer margin of elytra; disc of ventrites scaly and with scattered bristles; pygidium convex, flatter in females; wide, subtrapezoidal; pygidial disc setose throughout, with thick erect bristles ( Fig. 15G ); parameres widened and swollen at the level of their split and narrowed towards the apex, parameral split at 2/3; inner margins straight ( Fig. 15 H–I); parameres in lateral view straight, not coplanar ( Fig. 15J ).

Type locality. Liogenys obscura : ARGENTINA, Río Negro (Patagonie); L. bruchi : ARGENTINA, “Alta Gracia La Granja, Sierras de Córdoba ”.

Geographical distribution. URUGUAY (Montevideo, Colonia); ARGENTINA (Catamarca, Santiago del Estero , Córdoba, San Luis, Mendoza, Buenos Aires, Río Negro) .

Remarks. The type series specimens of L. bruchi were found at the MACN and ZMHB, although in their labels the date varies: XII.1921, I.1922 (MACN), and IX.1922 (ZMHB). Moreover, none of them match exactly with the month and/or year stated by Moser (1924) in the original description, which is XI—XII.1922. To maintain the stability of the name we designate the specimen of ZMHB as the lectotype, as this is the only one bearing the original label of type specimen written by Moser ( Fig. 15B, D ).

Figures

FIGURE 15. Liogenys obscura Blanchard, 1851 female lectotype views: A) dorsal, C) labels; L. bruchi Moser, 1921 male lectotype views: B) dorsal, D) labels, E) head and pronotum, F) lateral, G) pygidium, and parameres in views: H) dorsal, I) dorsolateral and J) lateral.

FIGURE 24. Geographical distribution of four known Liogenys species occurring in the Chacoan province and its boundaries. Shaped points: previously known species; colors: Neotropical provinces (Morrone 2014) and Monte province from the South American Transition Zone (Roig-Juñent et al. 2018).