Liogenys Guerin-Meneville 1831
Creators: name: Cherman, Mariana A.
name: Basílio, Daniel S.
name: Mise, Kleber M.
name: Frisch, Johannes
name: Smith, Andrew B. T.
name: Almeida, Lúcia M.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Melolonthidae
Liogenys

description: Identification key to Liogenys from the southern South American Transition Zone and boundaries *
*Note on dimorphism: Males have protarsi and mesotarsi flat (wide or not) and females have all tarsi cylindrical.
1. Length of antennal club two times longer than the funicle or almost so (Fig. 10D); head, pronotum, and scutellum dark purplish brown, elytra yellow (Fig. 10A); elytra glabrous; metatibia with inner margin not carinate in both sexes........................................................................................... Liogenys xanthocera Harold, 1869
- Length of antennal club as long as or slightly longer than funicle; head, pronotum, scutellum, and elytra unicolored, yellow or light brown, elytra sometimes slightly lighter in color than pronotum; elytra glabrous or with bristles; male with metatibia weakly or strongly carinate toward apex....................................................................2
2. Head more coarsely punctate than pronotum (Fig. 8B); pronotum wider than elytra at its humeral callus; galea with a single, long, hook-like tooth (Fig. 13G); antenna with 9 antennomeres; elytra with bristles............................................................................................... Liogenys maxillaricuspis Cherman, new species
- Head as punctate as or less coarsely punctate than pronotum; pronotum as wide as or slightly narrower than elytra at its humeral callus; galea with four or five teeth (Fig. 13E), the superior tooth slightly larger than the other teeth; antenna with 9–10 antennomeres; elytra glabrous or with bristles................................................................... 3
3. Pygidium longer than wide (Fig. 1E) and always with bristles.................................................. 4
- Pygidium as wide as or wider than long, glabrous or with bristles................................................6
4. Antenna with 10 antennomeres; body length up to 8.5 mm; clypeus emargination in general deep, eventually shallow, narrower than the distance between eyes in both sexes; protibia with three teeth in both sexes; males with inner margin of metatibia carinate towards apex or not................................................................................ 5
- Antenna with 9 antennomeres; body length more than 8.5 mm; clypeus emargination noticeably shallow, females with emargination narrower than the distance between eyes, males with emargination as wide as the distance between eyes (Fig. 4F); protibia in males with two teeth and in females with three teeth; males with inner margin of metatibia carinate......................................................................................... Liogenys flavida Moser, 1918
5. Head as wide as or narrower than posterior margin of pronotum (Fig. 9C); clypeus as long as frons; vertex finely to coarsely punctate; males with inner margin of metatibia carinate straight towards apex; protarsi noticeably enlarged, protarsomere II wider than long.............................................................. Liogenys rufoflava Moser, 1918
- Head distinctly wider than posterior margin of pronotum (Fig. 1B); clypeus noticeably shorter than frons; vertex smooth (Fig. 1B); males with inner margin of metatibia not carinate; protarsi slightly enlarged, protarsomere II longer than wide..................................................................... Liogenys brachyclypeata Cherman, new species
6. Elytra and pygidium glabrous; males with inner margin of metatibia carinate towards apex; protarsomere II noticeably wider than long; apex of parameres lanceolate in a single plane (Figs. 3F, 9F)................... Liogenys flaveola Moser, 1924
- Elytra and pygidium with bristles; males with inner margin of metatibia weakly or not carinate, if carinate, carina never reaching the apex; protarsomere II as long as or longer than wide; apex of parameres lanceolate or not, if lanceolate, never in a single plane (Figs. 2F, 5F, 7F)................................................................................. 7
7. Elytra dull yellow, never pruinose or if so, not uniformly, pronotum unicolored with elytra; males with metatibial transverse carinae incomplete (Fig. 6E).............................................................................8
- Elytra light brown, uniformly pruinose, pronotum dark brown, darker than elytra; metatibia with one or two transverse carinae complete in both sexes (Fig. 5D .......................................................................... 9
8. Clypeal lateral margin with a blunt projection (Fig. 2D), convex; clypeal teeth well developed in both sexes, teeth acute; protibia with three teeth in both sexes; males with protarsomere and mesotarsomere II equally wide; spurs of metatibia uneven in shape (Fig. 2E)................................................................ Liogenys calcarata Frey, 1970
- Clypeal lateral margin not produced, straight or concave, clypeal teeth well developed only in males, teeth broad; protibia in males with two teeth and in females with three teeth; males with protarsomere II noticeably wider than mesotarsomere II; spurs of metatibia even in shape (Fig. 6C).................................. Liogenys lucialmeidae Cherman, new species
9. Elytra shiny or semiopaque, never pruinose; ventrites and pygidium with few bristles; males with two protibial teeth and females with three teeth.......................................................... Liogenys kuntzeni Moser, 1921
- Elytra opaque, noticeably pruinose (Fig. 7E); ventrites and pygidium with thick, scale-like bristles; both sexes with three protibial teeth........................................................ .. Liogenys martinezi Cherman, new species
description: Published as part of Cherman, Mariana A., Basílio, Daniel S., Mise, Kleber M., Frisch, Johannes, Smith, Andrew B. T. & Almeida, Lúcia M., 2020, Liogenys Guérin-Méneville, 1831 (Coleoptera: Scarabaeidae: Melolonthinae) from the southern South American Transition Zone and boundaries: taxonomic overview with four new species, pp. 46-84 in Zootaxa 4896 (1) on pages 48-49, DOI: 10.11646/zootaxa.4896.1.2, http://zenodo.org/record/4359172