Gonaphodioides, Dellacasa, Dellacasa, & Gordon, 2012

Dellacasa, Marco, Dellacasa, Giovanni & Arriaga-Jiménez, Alfonsina, 2018, Gonaphodioides zempoaltepetlensis (Coleoptera: Scarabaeidae: Aphodiinae), a new species from Oaxaca, Mexico, Zootaxa 4508 (4), pp. 587-593 : 591-592

Key to species of Gonaphodioides modified from Dellacasa et al. (2012)

1. Elytra denticulate at humeral angle ................................................................................................................................................... 2

- Elytra not denticulate at humeral angle but therein with distinctly raised epipleural carina ............................................................ 8

2. Elytra subparallel sided, elongate (see Dellacasa et al. 2012). Length 5.5–6.0 mm. Bolivia, Colombia........................................... ....................................................................................................................................................... G. acutecernans (Balthasar, 1960)

- Elytra oval, less elongate (see Dellacasa et al. 2012). Length 3.5–6.0 mm...................................................................................... 3

3. Elytral interstriae distinctly convex. Length 4.0–5.0 mm. Colombia, Venezuela................................ G. columbicus (Harold, 1880)

- Elytral interstriae flat or almost flat. Length 3.5–6.0 mm................................................................................................................. 4

4. Pronotum dually punctate; few large punctures irregularly scattered on sides; small punctures evenly, sparsely distributed throughout.......................................................................................................................................................................................... 5

- Pronotum simply, evenly, or almost evenly punctate ........................................................................................................................ 6

5. Elytral striae fine, sparsely punctate, faintly crenulate; interstriae flat with extremely fine, sparse punctures. Black. Length 5.0– 6.0 mm. Mexico (Chiapas) ................................................................................... G. skelleyi Dellacasa, Dellacasa, & Gordon, 2012

- Elytral striae deep, coarsely, densely punctate, crenulate; interstriae feebly convex, sparsely but distinctly punctate. Piceous black; elytra with yellow spots variously arranged. Length 3.5–4.0 mm. El Salvador....................................................................... ........................................................................................................................ G. cartwrighti Dellacasa, Dellacasa, & Gordon, 2013

6. Pronotum lateral margins strongly inwardly sinuate before hind angles. Dorsal surface yellowish brown, head anteriorly and sides of pronotum lighter; elytra with juxtasutural interstria, base of interstria 5 and preapical declivity brown, apical declivity with an oblique oval yellow spot extended from interstria 2–7 and with margins dark brown ( Fig. 5); sometimes the margins widely faded ( Fig. 6–7). Length 4.5–5.0 mm. Mexico (Oaxaca) ...................................................................... G. zempoaltepetlensis , new species

- Pronotum lateral margins feebly sinuate before hind angles or subparallel. Color uniformly darker brown, occasionally with a vague mark on elytral declivity. Length 3.5–4.5 mm ........................................................................................................................ 7

7. Elytral interstriae coarsely punctate. Dorsal color dark chestnut brown. Length 3.5–4.0 mm Mexico (Oaxaca) .............................. ............................................................................................................................ G. ratcliffei Dellacasa, Dellacasa, & Gordon, 2012

- Elytral interstriae finely punctate. Dorsal color dark brown. Length 4.0– 4.5 mm. Mexico (Hidalgo, Puebla, San Luis Potosí)....... .............................................................................................................................. G. newtoni Dellacasa, Dellacasa, & Gordon, 2012

8. Elytral interstriae flat, superficially microreticulate thus almost dull; sides of pronotum relatively more coarsely and more irregularly punctate. Dorsal color reddish testaceous. Length 3.5–4.0 mm. Bolivia, Brazil, Paraguay....................................................... ............................................................................................................................................................... G. sincerus (Petrovitz, 1973)

- Elytral interstriae convex, smooth thus shiny; sides of pronotum relatively less coarsely and more regularly punctate. Dorsal color chestnut brown. Length 4.0– 4.5 mm. Brazil, Costa Rica, Ecuador, Mexico (Oaxaca), Panama, Peru, Venezuela............................ .................................................................................................................................................................... G. chapini (Hinton, 1934)