Liogenys rufocastanea 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 : 51-52

Liogenys rufocastanea Moser, 1921 Fig. 70

Liogenys rufocastaneus Moser, 1918: 103 (orig. desc.); Blackwelder 1944: 228 (check.); Frey 1969: 42 (key); Evans 2003: 214 (check.); Evans and Smith 2005: 178 (check.); Evans and Smith 2009: 182 (check.).

Type material.

Liogenys rufocastaneus male syntype (ZMHB): [white printed] “Paraguay”, [white handwritten] " Liogenys / rufocastaneus /Mos/Type m#.", [light red printed] “Typus”, [white printed] " Liogenys / rufocastaneus /Mos.". Genitalia mounted. This type is here designated the lectotype: [white, outlined in red, printed] "LECTOTYPE/ Liogenys rufocastaneus /Moser, 1921/des. M. A. Cherman 2016". A female syntype (ZMHB): [white printed] “Brasilien”, [white handwritten] " Liogenys / rufocastaneus /Mos/Type f#." [light red printed] “Typus”, [white printed] " Liogenys / rufocastaneus /Mos." These syntype are here designated as paralectotype, with the label: "PARALECTOTYPE/ Liogenys rufocastaneus / Moser, 1921/ des. M. A. Cherman 2016".

Non-type material.

without locality and date, Kraatz, 1 ex. (SDEI); PARAGUAY. Without date, Fry, 1 ex. (NHMB); Without date, Kraatz, 9 ex. (SDEI). BRAZIL. Without date, Kraatz, 7 ex. (SDEI).

Diagnosis.

Body, elytra and pronotum brown; elongate; clypeus weakly emarginate; clypeus and frons almost coplanar; outer sides of anterior teeth follow the lateral margin of clypeus; clypeal lateral margin straight; pronotal posterior corners rounded; mesotibia cylindrical in cross section; pygidium flat and wide; pygidial width exceeding distance between spiracles of propygidium; pygidial disc bristled only on apex, punctures very sparse; pygidial apex quadrate; males genitalia, basal region of parameres wider than the parameres together at its maximum width; apex ornamented and emarginate laterally forming two projections at each side (Fig. 70F), subapical angles sharp, truncated and slightly divergent apically.

Redescription.

Length: 8.0-9.0 mm; width: 4.1-4.2 mm. Brown. Head: distance between eyes nearly twice the width of one eye in males, wider in females; frons shorter than clypeus; clypeus and frons almost coplanar; anterior margin of clypeus slightly emarginate, emargination shallow, rounded and wide; outer sides of anterior teeth follow the lateral margin of clypeus; clypeal lateral margin straight; canthus not exceeding the outer margin of the eye; distal maxillary palpomere, maximum width 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 and longer than flagellum. Thorax: anterior margin of pronotum slightly produced medially; maximum length of pronotum exceeding the length of tarsomeres I, II and III together, disc glabrous, punctures very sparse and coarse; pronotal posterior corners rounded; proepisternum with short bristles; mesosternum scaly; sides of metasternum with sparse scales anteriorly, few long bristles on the anterior margin; distance between meso- and metacoxae up to twice longer than the metacoxa; scutellum ogival, sparse and coarse punctures at the sides of the base. Elytra: shiny, glabrous, uniform brown; 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, outer surface up to inner margins of femur, smooth at 12 × magnification; three protibial teeth, middle and apical equal in size, the three teeth equally spaced; protibial inner apical spur present; mesofemural disc setose, with a row of long bristles on the anterior margin; mesotibia cylindrical in cross section, disc finely sculptured, two mesotibial transverse carinae, the apical one incomplete in males; basal apophysis of metacoxa produced beyond the outer margin of trochanter, disc scaly; inner margin of metatibia carinated towards apex, apical inner surface setose; metatibial disc finely sculptured; metatibial transverse carina present posteriorly; metatibial apical spurs of different lengths, the longest shorter than the diameter of the tibial apex; protarsomere II long; in males pro- and mesotarsomeres I to IV enlarged, protarsomeres wider than the mesotarsomeres, twice as wide as metatarsi; basal metatarsomere twice shorter and slightly wider than tarsomere II; claw bifid, symmetrical, superior tooth longer and narrower than the inferior; distance between teeth shorter than the inferior tooth. Abdomen: ventrites bristled sparsely on disc and sides; propygidium visible, glabrous or scarcely bristled; pygidium flat, sub-trapezoidal, wide, as longer as wide, pygidial width exceeding distance between spiracles of propygidium; pygidial disc bristled only on apex; pygidial apex quadrate. Parameres: basal region wide and somewhat swollen, very short, parameral split at 1/3; ventral sides of base projected laterally; parameral inner margins straight; apex ornated, emarginate laterally forming two projections at each side, the basal one sharp, apical one truncated and slightly divergent (Fig. 70F). In lateral view parameres straight almost coplanar with basal region (Fig. 70G).

Type locality.

PARAGUAY.

Geographical distribution.

BRAZIL; PARAGUAY.

Remarks.

Liogenys rufocastanea resembles Pacuvia castanea Curtis -the species type of the Chilean genus- in the shape of the clypeus plus frons, which are almost coplanar and in the clypeus slightly emarginate, being this one a non-common feature among Liogenys species.