Onthophagus eulophus, Bates, 1887

Kohlmann, Bert & Solís, Ángel, 2025, A review of the species groups of the Western Hemisphere Onthophagus Latreille (Coleoptera: Scarabaeidae: Scarabaeinae) using COI barcoding and gene trees, Zootaxa 5604 (4), pp. 401-447 : 426

publication ID	https://doi.org/10.11646/zootaxa.5604.4.1
publication LSID	lsid:zoobank.org:pub:6A95109D-6F33-4DE7-9D47-6A722DD26918
DOI	https://doi.org/10.5281/zenodo.15225832
persistent identifier	https://treatment.plazi.org/id/03AA2362-147A-FF8F-FF28-AAA8FA83A84B
treatment provided by	Plazi
scientific name	Onthophagus eulophus
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Onthophagus eulophus View in CoL species group*.

This group is diagnosed by a slightly emarginate clypeus; apical and internal male protibial margins projected ( Figs. 1.23 View FIG –25); male protibial apex with some short setae ( Figs. 1.23 View FIG –25); male protibial spur strongly bent inwards ( Figs. 1.23 View FIG –25); male pronotum with a horn or a plate-like horn, which is level or turned upwards, never bent downwards.

Although no species of this group could be included in the mtDNA analysis, this aggregation is established based on a characteristic set of morphological characters, like having apical and internal male protibial margins projected and a male protibial spur strongly bent inwards ( Figs. 1.23 View FIG –25). Moreover, contrary to the O. mexicanus species group that have long and slender male protibiae ( Figs. 1.26 View FIG –28), this group has short and stout male protibiae ( Figs. 1.23 View FIG –25). All species of this group seem to be associated with rodent nests; this behavior is supported by the shortened male protibiae and bent male protibial spurs (Moctezuma & Halffter 2021; Moctezuma et al. 2023). We consider that this group includes eight species ( Table 7 View TABLE 7 ). Zunino & Halffter (1997) and Moctezuma & Halffter (2021) consider these species part of the O. mexicanus species group. The O. eulophus species group is primarily distributed in the mountains of the southwestern United States of America and along the Mexican Pacific mountain slopes, except for O. totonacus Moctezuma & Halffter , which lives along the Mexican Gulf piedmont.

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Figures

FIG. 1. Neighbor-joining tree for the Western Hemisphere Onthophagus species, based on K2P genetic distances comparisons between COI-5P mitochondrial barcoding sequences. Figs. 23–25 belong to the O. eulophus species group. Figs. 44 and 63 are not assigned to any species group. The male protibiae of the following species are depicted: 1, O. acuminatus; 2, O. batesi; 3, O. incensus; 4, O. nitidor; 5, O. stockwelli; 6, O. striatulus striatulus; 7, O. tristis; 8, O. basicarinatus; 9, O. hircus; 10, O. marginicollis; 11, O. nyctopus; 12, O. onorei; 13, O. osculati; 14, O. ptox; 15, O. ranunculus; 16, O. atriglabrus; 17, O. genuinus; 18, O. rostratus; 19, O. sharpi; 20, O. tapirus; 21, O. villanuevai; 22, O. violetae; 23, O. anewtoni; 24, O. arnetti; 25, O. browni; 26, O. championi; 27, O. guatemalensis; 28, O. mexicanus; 29, O. cartwrighti; 30, O. velutinus; 31, O. alluvius; 32, O. altivagans; 33, O. anthracinus; 34, O. brachypterus; 35, O. chryses; 36, O. landolti; 37, O. lecontei; 38, O. schaefferi; 39, O. concinnus; 40, O. cynomysi; 41, O. hecate hecate; 42, O. medorensis; 43, O. orpheus orpheus; 44, O. polyphemi sparsisetosus; 45, O. chevrolati; 46, O. cyanellus, 47, O. hippopotamus; 48, O. oaxacanus; 49, O. reyesi; 50, O. salvadorensis; 51, O. sanpabloetlorum; 52, O. skelleyi; 53, O. subtropicus; 54, O. totonicapanus; 55, O. vespertilio; 56, O. crinitus; 57, O. gazellinus; 58, O. onthochromus; 59, O. aciculatulus; 60, O. coscineus; 61, O. hoepfneri; 62, O. igualensis; 63, O. lebasi; 64, O. pennsylvanicus; 65, O. subanaeus; 66, tuberculifrons; 67, O. barreti; 68, O.breviconus; 69, O. contrapositus; 70, O. dicranius; 71, O. dorsipilulus; 72, O. humboldti; 73, O. kohlmanni; 74, O. micropterus; 75, O. neomirabilis; 76, O. orphnoides; 77, O. petenensis; 78, O. subcancer; 79, O. andersoni; 80, O. belorhinus; 81, O. grataehelenae; 82, O. limonensis; 83, O. maya; 84, O. praecellens; 85, O. propraecellens; 86, O. rhinolophus; 87, O. rhinophyllus; 88, undescribed species of Onthophagus; 89, O. viridivinosus; 90, O. xanthomerus. See Table 2 for an explanation of the specimen codes. See Table 7 for the author names of the species listed.

Kingdom	Animalia
Phylum	Arthropoda
Class	Insecta
Order	Coleoptera
Family	Scarabaeidae
SubFamily	Scarabaeinae
Genus	Onthophagus

Onthophagus eulophus, Bates, 1887

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