Orizabus isodonoides

Orizabus isodonoides
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Clade:	Pancrustacea
Class:	Insecta
Order:	Coleoptera
Suborder:	Polyphaga
Infraorder:	Scarabaeiformia
Family:	Scarabaeidae
Genus:	Orizabus
Species:	O. isodonoides
Binomial name
	Orizabus isodonoides; Fairmaire, 1878
Synonyms
	Cheiropiatys isodonoides Bates 1888; Orizabus (Aztecalius) isodonoides Casey 1915;

Orizabus isodonoides is a species of beetle occurring in Mexico.

Description

It may be useful to consult a beetle anatomy chart when considering the following technical features distinguishing Orizabus isodonoides from other Orizabus species in the USA (not including Mexican species):

It has a distinct, transverse fronto-clypeal carina (instead of a tubercle)
The male's protibiae exhibit unishaped or bisinuate dorsal margins (tibiae with two or three weak lobes)
The pronotum has a distinctive shape
Antenna lamellae are relativelly broader, and subovate (in apical view)
In medium and large males, there's a noticeable anteromedial pronotal tubercle which is separate from the anterior marginal bead and the paramera
The anterior marginal bead is not angularly wider at the middle
In males and some females a broad depression usually is evident behind the pronotal tubercle

Range

A 2008 study by Leonardo Delgado stated that Orizabus isodonoides was known in the Mexican states of Chihuahua, Durango, México, Hidalgo, Jalisco, Morelos, Oaxaca, and Puebla. In July 2025 the iNaturalist website documented research-grade observations of Orizabus isodonoides only in the Mexican states of Querétaro, Tlaxcala and México. A 2010 study described the distribution as central, western and northwestern Mexico.

Habitat

Orizabus isodonoides appears to be a highland species. An observation from the state of Chihuahua describes it as occurring in an oak-pine forest at an elevation of 1700m (~5600 ft). The individual featured on this page was found on the exterior wall of a residence in the state of Querétaro at ~ 1880m (~6170 ft).

More pictures

References

1 2 3 Warner, William B. (April 22, 2011), "Review of the genus Orizabus Fairmaire in the United States of America (Coleoptera: Scarabaeidae: Dynastinae)", Insecta Mundi, Gainesville, Florida, USA: Center for Systematic Entomology, retrieved July 4, 2025
↑ Delgado, Leonardo (January 1, 2008). "A New Species of Orizabus (Coleoptera: Scarabaeidae) from Mexico, New Records, and a Revised Key to the Species". Annals of the Entomological Society of America. 101 (1). Entomological Society of America: 53–57. doi:10.1603/0013-8746(2008)101[53:ANSOOC]2.0.CO;2. Retrieved July 5, 2025.
↑ "Orizabus isodonoides". inaturalist.org. Retrieved July 4, 2025.
↑ Ratcliffe, Brett C.; Cave, Ronald D (June 18, 2010), "New species of Orizabus Fairmaire (Coleoptera: Scarabaeidae: Dynastinae: Pentodontini) from Mexico and Guatemala, with a revised key and checklist of the species in the genus", Insecta Mundi, Gainesville, Florida: Center for Systematic entomology: 1–16
↑ "Observation of Orizabus isodonoides". inaturalist.org. Retrieved July 4, 2025.

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[fla-1] 1 2 3 Warner, William B. (April 22, 2011), "Review of the genus Orizabus Fairmaire in the United States of America (Coleoptera: Scarabaeidae: Dynastinae)", Insecta Mundi, Gainesville, Florida, USA: Center for Systematic Entomology, retrieved July 4, 2025

[2] Delgado, Leonardo (January 1, 2008). "A New Species of Orizabus (Coleoptera: Scarabaeidae) from Mexico, New Records, and a Revised Key to the Species". Annals of the Entomological Society of America. 101 (1). Entomological Society of America: 53–57. doi:10.1603/0013-8746(2008)101[53:ANSOOC]2.0.CO;2. Retrieved July 5, 2025.

[3] "Orizabus isodonoides". inaturalist.org. Retrieved July 4, 2025.

[4] Ratcliffe, Brett C.; Cave, Ronald D (June 18, 2010), "New species of Orizabus Fairmaire (Coleoptera: Scarabaeidae: Dynastinae: Pentodontini) from Mexico and Guatemala, with a revised key and checklist of the species in the genus", Insecta Mundi, Gainesville, Florida: Center for Systematic entomology: 1–16

[5] "Observation of Orizabus isodonoides". inaturalist.org. Retrieved July 4, 2025.