Liogenys corumbana Moser, 1921

Cherman, Mariana Alejandra, Mise, Kleber Makoto, Moron †, Miguel Angel, Vaz-de-Mello, Fernando Z. & Almeida, Lucia Massutti de, 2017, A taxonomic revision of Liogenys occurring in Brazil with an interactive key and remarks on New World Diplotaxini (Coleoptera, Melolonthidae), ZooKeys 699, pp. 1-120 : 24-27

Liogenys corumbana Moser, 1921 Figs 61, 93

Liogenys corumbanus Moser, 1921b: 139 (orig. desc.); Frey 1969: 47 (key).

Liogenys corumbana : Blackwelder 1944: 227 (check.); Evans 2003: 207 (check.); Evans and Smith 2005: 172 (check.); Evans and Smith 2009: 176 (check.).

Type material.

Liogenys corumbanus male syntype (ZMHB): [white printed] "Corumba/Matt. Grosso", [white handwritten] " Liogenys / corumbanus /Mos/Typen m#.", [light red printed] “Typus”, [white printed] " Liogenys / corumbanus /Mos.", [red printed] "Syntypus/ Liogenys / corumbana Moser, 1921/labelled by MNHUB 2011". Genitalia mounted. This type is here designated the lectotype: [white, outlined in red, printed] "LECTOTYPE/ Liogenys corumbanus /Moser, 1921/des. M. A. Cherman 2012". Seven males and two female syntypes of L. corumbana (ZMHB): [white printed] "Corumba/Matt. Grosso", [white handwritten] " Liogenys / corumbanus /Mos/Typen", [light red printed] “Typus”, [white printed] " Liogenys / corumbanus /Mos.", [red printed] "Syntypus/ Liogenys / corumbana Moser, 1921/labelled by MNHUB 2011". These nine syntypes are here designated paralectotypes, each one with the label: "PARALECTOTYPE/ Liogenys corumbanus / Moser, 1921/ des. M. A. Cherman 2012".

Non-type material.

BRAZIL: MT: Campo Verde, "Fazenda Cavera", 21/X/2011, Biava col., 1 ex. (CEMT); Comodoro, "Morro do sem Boné”, 13°43'54"S, 60°18'40"W, X/2012, M.F. Souza col., 1 ex. (CEMT); Cuiabá, Boa Esperanza, X/2011, F. Vaz-de-Mello col., 1 ex. (CEMT); without date and collector, 1 ex. (ZMHB); Poconé, "SESC Pantanal", 8/XII/2003, without collector, 1 ex. (CEMT); Varzea Grande, 13/V/2009, Friozzo col., 1 ex. (CEMT); "VBS Trindade [Vila Bela da Santíssima Trindade] - Rio Guaporé”, 30/IX-1/X/1984, Binda col., 72 ex. (INPA); "Vila Bela [Vila Bela da Santíssima Trindade] - Margem Guaporé”, 1-30/IX/1984, Marcolino col., 9 ex. (CEMT); MS: Campo Grande, X/1947, A. Maller col., 1 ex. (AMNH).

Diagnosis.

Body and elytra yellowish; elongate; pronotum and scutellum reddish yellow; clypeal emargination deep, sharp and narrow; outer sides of anterior teeth parallel; clypeal lateral margin convex, with a sharp tooth-like projection, obtuse angle between outer side of anterior teeth and clypeal lateral projection; canthus exceeding the outer margin of the eye; anterior margin of pronotum straight, flanged throughout; pronotal posterior corners obsolete (Fig. 61A); mesotibia quadrate in cross section; metafemur, thick and erect bristles on posterior margin; inner surface of metatibia glabrous; pygidium convex and wide, sub-quadrate; pygidial width exceeding distance between spiracles of propygidium; bristles only at the apex or sides; total length of parameres near three times the length of their apex; apex harpoon-like with lateral angle projecting straight downward (Fig. 61F).

Redescription.

Length: 7.0-8.0 mm; width: 3.7-4.2 mm. Yellowish. Head: distance between eyes more than twice the width of one eye, wider in females; frons equal in length to clypeus; clypeal emargination narrow, deep and sharp; outer sides of anterior teeth sub-parallel; outer margin of anterior teeth as long as the eye; lateral margin convex, with a sharp tooth-like projection; distance between this projection and anterior margin of eye longer than one eye; distance between clypeal lateral projection and anterior tooth shorter than basal width of anterior tooth; obtuse angle between outer side of anterior teeth and clypeal lateral projection; canthus exceeding the outer margin of the eye; distal maxillary palpomere, maximum width less than twice width of apex; fovea deep, extending past the transverse midline of the palpomere; labium transversely carinated, as wide as it is long; antenna 10-articulated, lamellae lighter in color than flagellum and in males lamellae longer than flagellum. Thorax: anterior margin of pronotum straight, flanged throughout; maximum length of pronotum exceeding the length of tarsomeres I, II and III together, disc glabrous, punctures dense and coarse; pronotal posterior corners rounded; proepisternum with short bristles; mesepisternum bristled, as are the sides of metasternum, few long bristles on the anterior margin; distance between meso- and metacoxae up to twice longer than the metacoxa; scutellum triangular, finely punctured mainly at the base. Elytra: shiny, glabrous, uniform yellowish; elytra more than three times longer than the pronotum; elytral suture and elytron unicolored, distinctly elevated; all four elytral ridges barely noticeable. Legs: procoxa, sparse scales on infra-carinal and outer surface, smooth at 12 × magnification; three protibial teeth, middle and apical equal in size, distance between basal and middle teeth longer than between middle and apical; protibial inner apical spur present; mesofemural disc setose, with a row of long bristles on anterior and posterior margins; mesotibia quadrate in cross section, disc finely sculptured, two mesotibial transverse carinae, the apical one incomplete; basal apophysis of metacoxa produced beyond the outer margin of trochanter; metafemur, thick and erect bristles on posterior margin; metatibial apical spurs of different lengths, the longest equal in length to the diameter of the tibial apex, inner margin of male metatibia carinated towards apex; apical inner surface glabrous; disc finely sculptured; metatibial transverse carina present posteriorly; basal metatarsomere smaller and wider than tarsomere II, in males protarsomere II long; in males pro- and mesotarsomeres I to IV enlarged, protarsomeres slightly wider than the mesotarsomeres, less than twice as wide as metatarsi; claw bifid, symmetrical, superior tooth longer and as wide as the inferior; distance between teeth shorter than the inferior tooth. Abdomen: ventrites with sparse short bristles on disc and sides; propygidium slightly visible, bristled; pygidium convex, sub-quadrate, wide, pygidial width exceeding distance between spiracles of propygidium; pygidial disc bristled on apex or sides; pygidial apex rounded. Parameres: basal region as wide as the parameres together at its transverse midline, parameral split at 2/3; total length of parameres near three times the length of their apex; inner margins straight; apex harpoon-like with lateral angle projecting straight downward (Fig. 61F). In lateral view parameres slightly concave (Fig. 61G).

Type-locality.

BRAZIL. Corumbá, Mato Grosso do Sul.

Geographical distribution.

BRAZIL (MT, MS).

Remarks.

Liogenys corumbana is one of the smallest Liogenys species together with L. minuta Moser, 1924, this one from central Argentina. Liogenys corumbana is somewhat similar to L. acutidens because they share the size and color, but L. corumbana differs easily from the other by the shape of clypeus being deeply emarginate anteriorly and lateral margin produced sharply, forming a tooth-like.