Onthophagus landolti, Harold, 1880

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 : 428

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.15225845
persistent identifier	https://treatment.plazi.org/id/03AA2362-1478-FF8D-FF28-AFD0FCA4AAD7
treatment provided by	Plazi
scientific name	Onthophagus landolti
status

Treatment

Onthophagus landolti View in CoL species group.

This group is diagnosed by the male having no head horns ( Fig. 5.14 View FIG ); male protibial apex with a tuft of long setae ( Figs. 1.31 View FIG –38); pronotum with a small central protuberance ( Fig. 5.14 View FIG ); metafemur brown to black with coarse punctures ( Figs. 2.31 View FIG –38).

This species group has been studied recently by Arriaga-Jiménez et al. (2020), within which they established the O. anthracinus species complex. According to Arriaga-Jiménez et al. (2020), the O. landolti species group comprises the following species complexes: O. anthracinus , O. lecontei – O. subopacus , and O. mariozuninoi , plus 18 unassigned taxa to species complexes. The O. landolti species group was established by Zunino & Halffter (1997) and is based on the Boucomont (1932) “8 e Groupe”. The species of this group have long, slender, and bent male protibiae with a tuft of long setae at their apex ( Figs. 1.31 View FIG –38).

In their Onthophagus analysis, Emlen et al. (2005: fig. 4) indicated that a branch formed by O. coscineus and O. knulli Howden & Cartwright (a member of the O. landolti species group) has a sister relationship with a branch formed by O. orpheus and O. hecate (no Bayesian posterior probability reported), thus supporting a relationship between the O. landolti and O. hecate species groups as suggested by this barcode study ( Figs. 1–2 View FIG View FIG ). O. knulli has since been synonymized with O. durangoensis Balthasar by Arriaga-Jiménez et al. (2020). This last species is a member of the O. anthracinus species complex. On the other hand, Breeschoten et al. (2016) recovered in their study an O. landolti clade with a bootstrap support value of 99 and suggested a stem origin of the group of approximately 17 Mya. The present barcode ( Figs. 1–2 View FIG View FIG ), bootstrap ( Fig. 8 View FIG ), and partition ( Fig. 9 View FIG ) analyses also suggest the existence of an O. landolti species group with a bootstrap value of 19. This low support node value suggests a similar situation as the one observed for the O. hoepfneri species group. It is highly possible that more species groups shall emerge from the O. landolti species group, once more species are added to the analysis. This group is distributed from the United States of America to Peru ( Zunino & Halffter 1997).

References

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.

FIG. 2. A summarized neighbor-joining tree for 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 group. The male metafemora 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.