Liogenys sinuaticeps Moser, 1918

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 : 57-58

Liogenys sinuaticeps Moser, 1918 Figs 72, 91

Liogenys sinuaticeps Moser, 1918: 104 (orig. desc.); Blackwelder 1944: 228 (check.), Frey 1969: 47 (key); Evans 2003: 214 (check.); Evans and Smith 2005: 178 (check.); Evans and Smith 2009: 182 (check.).

Type material.

Liogenys sinuaticeps male syntype (ZMHB): [white printed] “Brasilia”, [white handwritten] " Liogenys / sinuaticeps /Mos/Typen m#.", [red printed] “Typus”, [white printed] " Liogenys / sinuaticeps /Mos.", [red printed] "SYNTYPUS/ Liogenys / sinuaticeps Moser, 1918/labelled by MNHUB 2014". Genitalia mounted. As according to Moser's, description there is only one type specimen, it is considered the holotype.

Non-type material.

BRAZIL. SP: Campinas, without date and collector, 1 ex. (ZMHB); RS: Itacurubi, 10/X/2012, I. Valmorbida col, 1 ex. (DZUP).

Diagnosis.

Body yellowish; elongate; elytra and pronotum uniform yellow; clypeal emargination rounded and wide; outer sides of anterior teeth sub-parallel; clypeal lateral projection barely noticeable, rounded; canthus exceeding the outer margin of the eye; labium not transversely carinated, longer than wide, labial sides swollen; sensorial area not reaching the midline of the palpomere and not forming a fovea; antenna 9-articulated; basal apophysis of metacoxa not produced; metafemur with thick and erect bristles on posterior margin; inner margin of male metatibia not carinated and not produced on apex, metatibial inner face glabrous; tarsi opaque, male protarsomeres enlarged as wide as the mesotarsomeres, more than twice as wide as metatarsi; pygidial disc glabrous; flat in lateral view; male genitalia, parameral width almost equal throughout their entire length; inner margins straight or slightly divergent, apex of parameres truncated and curved downwards (Fig. 72F).

Redescription.

Length: 9.8-10.1 mm; width: 5.1-5.2 mm. Yellowish. Head: distance between eyes more than three times wider than one eye; frons equal in length to clypeus; clypeal emargination shallow, rounded and wide; outer sides of anterior teeth sub-parallel; outer margin of anterior teeth longer than the eye; clypeal lateral margin convex, with a rounded projection barely noticeable; distance between clypeal lateral 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; canthus exceeding the outer margin of the eye; maxilla, teeth of galea reduced; distal maxillary palpomere, maximum width barely wider than apex; sensorial area not reaching the midline of the palpomere and not forming a fovea; labium not transversely carinated, longer than wide, labial sides swollen; antenna 9-articulated, lamellae unicolored with flagellum and in males they are equal in length. Thorax: anterior margin of pronotum straight; maximum length of pronotum exceeding the length of tarsomeres I, II and III together; disc glabrous, punctures fine and very sparse; pronotal posterior corners rounded; proepisternum bristled; mesepisternum scaly; sides of metasternum glabrous; distance between meso- and metacoxae up to twice longer than the metacoxa; scutellum ogival, coarsely punctured at the base or sides. Elytra: shiny, glabrous, uniform yellowish brown; elytra more than three times longer than the pronotum; elytral suture and elytron unicolored, distinctly elevated; the two pairs of inner ridges more noticeable than the two outer pairs. Legs: procoxa scaly on infra-carinal surface and bristled on the outer one; smooth at 12 × magnification; three protibial teeth, the apical the longest, the three teeth equally spaced; protibial inner apical spur present; mesofemural disc setose; mesotibia cylindrical in cross section; disc finely sculptured, two mesotibial transverse carinae, the apical one incomplete; basal apophysis of metacoxa not produced; metafemur with thick and erect bristles on posterior margin; metatibial apical spurs of different lengths, the longest one exceeding the diameter of the tibial apex; inner margin of metatibia not carinated and not produced on apex; metatibial disc finely sculptured; two metatibial transverse carinae present posteriorly; tarsi opaque; basal metatarsomere shorter and wider than tarsomere II; in males protarsomere II short and wide; pro- and mesotarsomeres I to IV enlarged, protarsomeres as wide as the mesotarsomeres, more than twice as wide as metatarsi; claw bifid, symmetrical, superior tooth longer and as wide as the inferior; distance between teeth longer than the inferior tooth. Abdomen: band of scales visible at the lowest magnification beneath the outer margin of elytra; ventrites bristled on disc; propygidium visible, glabrous; pygidium flat, sub-trapezoidal, wider than long; pygidial width not exceeding distance between spiracles of propygidium; pygidial disc glabrous; pygidial apex quadrate or sub-quadrate. Parameres: width almost equal throughout the entire length of the parameres; parameral split at the third portion; inner margins straight, slightly divergent; parameres apex truncated (Fig. 72F). In lateral view parameres slightly convex, apex curved downwards (Fig. 72G).

Type-locality.

BRAZIL.

Geographical distribution.

BRAZIL (SP, RS).

Remarks.

Liogenys sinuaticeps is a singular species, distinguished from the other Liogenys by its labium longer than wider, without concavity on disc (as in Pacuvia ) (Fig. 24), and the five teeth of the maxilla reduced (Fig. 27). Liogenys sinuaticeps shares with L. laminiceps and L. flavida in having antenna 9-articulated, disagreeing with Moser (1918) who states that the antenna is 10-articulated. This species is closely related to L. unicolor (Fig. 78) ( Cherman et al. 2016) and they share the following features: sensorial area of the maxillar distal palpomere not forming a fovea (Fig. 28), this feature also in common with L. macropelma ; pygidial disc glabrous and the basal apophysis of metacoxa not produced, also in common with L. tarsalis (Fig. 75).