Key to Trinodia species

This key to the species of Trinodia is based on: [[Media:Potts 1945 key to species cremastocheilini.pdf|Potts, R.W.L. 1945. A key to the species of Cremastocheilini of North American and Mexico (Coleoptera: Scarabaeidae). Bull. Brooklyn Ent. Soc. 40: 72-78.]] and Alpert, Gary D. 1994. A Comparative Study of the Symbiotic Relationship Between Beetles of the Genus Cremastocheilus (Coleoptera: Scarabaeidae) and their Host Ants (Hymenoptera:Formicidae). Sociobiology 25(1).

You may also be interested in: [[Media:Krikken 1981.pdf|Krikken, J. 1982. North American myrmecophilous beetles of the genus Cremastocheilus: discussion of their classification and a review of the subgenera Trinodia and Anatrinodia (Coleoptera: Cetoniidae). Proceedings of the Koninklijke Nederlandse Academie van Wetenschappen. Series C. p. 509-526.]] and [[Media:Mynhardt & Wenzel 2010.pdf|Mynhardt, G. & J.W. Wenzel 2010. Phylogentic analysis of the myrmecophilous Cremastocheilus Knoch (Coleoptera, Scarabaeidae, Cetoniinae), based on external adult morphology. ZooKeys 34: 129-140.]]

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 * Anterior and posterior tibia and femora notably broad and compressed (Fig. ) (Planipes Group)..........2


 * Posterior tibia not notably broad and compressed . . . . . 2

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 * Elytra with subcylindrical ring-like punctures, often coalescent (Fig. ); 3rd tarsomere of anterior tarsus attached to 4th below upper proximal corner, AZ, NM (Fig. ). . . . . Cremastocheilus


 * Elytra with elongate punctures; 3rd tarsomere of anterior tarsus attached to 4th at the extreme outer corner of the posterior margin of that segment, Ca, AZ. ....Cremastocheilus