[Cyclocephala ligyrina Bates, 1888] Pas une guyanaise!

J'ai beaucoup de mal avec ces petits Cyclocephalini noirs...

Cette femelle vient du Panama, El Valle, la mesa, 850m, 21/V/2004, 24 mm


Je m'orienterai bien vers les Dyscinetus, mais sans édéage...

Stéphane

Salut,

on va dire Cyclocephala carbonaria Arrow, 1911

Yannig

Comment éliminer les Dyscinetus? Quels sont les critères qui les différencient des Cyclocephala?

Stéphane

I am sends you copies textual of the key of Endrody the difference for Dyscinetus and Cyclocephala:

10 (21) Anterior tarsi of males tickened, inner claw usually much bigger than other and strongly curved, apex simple or insiced.

11 (20) Propygidium without long setae

12 (16) apex of clypeus rounded, truncated or emarginated.

13 (19) Clypeus variable, but never short trapezoidal, anterior margin of pronotum never produced in the middle.

14 (15) Clypeus more or less strongly contracted towards the front, apex runded and either truncated or emarginated. Never dilated to apex. Mandibles narrow short. Antennate 8 -10 jointed. Club in males often more or leass longer than in females. Surface yellow with or without black spots, or dark brown to black. 25- 50 mm ....... Cyclocephala Latreille, 1829

!5 (14) Clypeo lightly dilated towards the front apex truncated or lightly rounded. Antenna 10 jointed. Species very similar to those of preceding genus. 9-17 mm. only A. fuliginea Burm. 25- 30 mm.............Aspidolea Bates,1888

16 (12) Apex of clypeus obtusely or sharply acuminated..............Mimeona Casey, 1915, Ancognatha Erichson, 1847

19 (13) Clypeus short trapezoidal sides nearly straight, very strongly contracted toward apex, apical margin lightly rounded,Mandibles broad, out sides without teeth. truncated or lightly emarginated. Antennae 10 jointed. Small club always very short. mandibles broad. Anterior margin of pronotum often produced in the middle, basis not bordered. Anterior tarsi of males slightly thickened. Inner claw often somewhat bigger than other one.Black species. 12- 24 mm.- In tropiouical and temperates zones of America................................... Dyscinetus Harold, 1869

20 (11) Propygidium with long setae. Mandibles broad. Antennas 10 jointed. Club short. basi of pronotum not bordered. Body contracted both forwards and back wards. Anterior tarsi of males strongly thickened. Outher side of elytra in females often distinctly enlarged or tickened. 11- 29 mm.............................Chalepides Casey, 1915

21 (10) Anterior tarsi simple also in males, not tickened.. other genera:....... Stenocrates, Erioscelis, Coscinocephalus, harposceles, Surutu

The real difference of Cyclocepahala and Dyscinetus is in the item 13 (19) but in fact, when when you observe many specimens you can see the difference between both genera.
Greeting,

Carlo

Thank you very much Carlos, this key is very nice!

Regards,

Stéphane

Chez cette espèce, la marge élytrale est très fortement rebordée (ça se voit sur la photo (mal, j'avoues!) à hauteur des tibias 3)... Cela n'est pas le cas chez l'autre espèce de Cyclocephala panaméenne.

Stéphane

Salut,

pour moi cette espece est donc Cyclocephala ligyrina Bates, 1888 l'elargissement élytral correspond avec cette espece.

A+
Yannig

Merci Yannig.

Stéphane