Oedionychina, Chapuis, 1875

Begha, Bruno Piotrovski, Prado, Laura Rocha & Oliveira, Sarah Siqueira, 2025, Oedionychina (Coleoptera: Chrysomelidae: Galerucinae: Alticini) from the Parque Estadual Altamiro de Moura Pacheco, a Cerrado remnant, Zootaxa 5659 (1), pp. 29-50 : 30-31

Identification key for Oedionychina recorded for Parque Estadual Altamiro de Moura Pacheco, Goiás, Brazil

1. Head with pale maculae in vertex (Figs 6D, 6E). Labrum with more than four setae. Pronotal lateral explanation narrow. Metafemur fusiform, width as great as about ½ of metatibia length (Fig. 3D, arrow). Fourth visible metatarsomere moderately globose, fusiform (Fig. 1D, arrow) ... Omophoita Chevrolat, 1836 .............................................. 2

– Head without pale maculae in vertex. Labrum with four setae. Pronotal lateral explanation wide. Metafemur triangular, width as great as length of metatibia ( Fig. 3A , arrow). Fourth visible metatarsomere strongly globose ( Fig. 1C , arrow).......... 3

2. Body integument black. Elytral integument reddish, with four rectangular elytral maculae. Pale macula of vertex rounded................................................................................ Omophoita mateusi sp. nov.

– Body integument reddish brown or light brown. Elytral integument reddish brown or light brown, with ten elytral maculae, eight larger in the dorsal region and two smaller in the humeral region. Pale macula of vertex rectangular.................................................................................... Omophoita magniguttis Bechyně, 1955

3. Eyes widely separated, interocular space nearly three times width of an eye.............. Paranaita opima ( Germar, 1824)

– Interocular space smaller, less than two times width of an eye.................................................. 4

4. Width of head greater than height in frontal view, interocular space nearly twice width of an eye, antennal calli brown, darker tone than rest of head..................................................... Alagoasa burmeisteri ( Harold, 1881)

– Width of head subequal to height in frontal view … Walterianella Bechyně, 1955 .................................. 5

5. Supracallinal sulcus of antennal calli not reaching margin of eye. Interocular space slightly wider than width of an eye. Anterofrontal ridge forming a 90-degree angle between frons and labrum. Elytral integument dark brown, with a yellowish horizontal band in median portion................................................. Walterianella marae sp. nov.

– Supracallinal sulcus horizontally straight, reaching the margin of eyes, and then curving upwards ( Fig. 6H ). Anterofrontal ridge gradually sloping towards labrum, not forming an angle. Body integument yellow, lacking elytral maculae........................................................................................... Walterianella tapuiae sp. nov.

Figures

FIGURE 1. Oedionychina sampled in Malaise trap in the Parque Estadual Altamiro de Moura Pacheco, Goiás, Brazil, dorsal view. A, Alagoasa burmeisteri (female and male, morphotype 1); B, Alagoasa burmeisteri (female, morphotype 2); C, Alagoasa burmeisteri (female, morphotype 3), arrow pointing the fourth visible strongly globose metatarsomere; D, Omophoita mateusi sp. nov. (male), arrow pointing the fourth visible fusiform metatarsomere.

FIGURE 3. Oedionychina sampled in Malaise trap in the Parque Estadual Altamiro de Moura Pacheco, Goiás, Brazil, dorsal view. A, Alagoasa burmeisteri (female and male, morphotype 1); B, Alagoasa burmeisteri (female, morphotype 2), arrow pointing the triangular metafemur; C, Alagoasa burmeisteri (female, morphotype 3); D, Omophoita mateusi sp. nov. (male), arrow pointing the fusiform metafemur. Scale bar 1 mm.

FIGURE 6. Oedionychina sampled in Malaise trap in the Parque Estadual Altamiro de Moura Pacheco, Goiás, Brazil, frontal view of the head. A, Alagoasa burmeisteri (female, morphotype 1); B, Alagoasa burmeisteri (female, morphotype 2); C, Alagoasa burmeisteri (female, morphotype 3); D, Omophoita mateusi sp. nov. (male); E, Omophoita magniguttis (female); F, Paranaita opima (male); G, Walterianella marae sp. nov. (female); H, Walterianella tapuiae sp. nov. (male). Scale bar 1 mm.