Onthophagus landolti Harold 1880
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2025
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| author | Kohlmann, Bert Solís, Ángel |
| author_facet | Kohlmann, Bert Solís, Ángel |
| contents | <p><b><i>Onthophagus landolti</i> species group</b>.</p><p>This group is diagnosed by the male having no head horns (Fig. 5.14); male protibial apex with a tuft of long setae (Figs. 1.31 –38); pronotum with a small central protuberance (Fig. 5.14); metafemur brown to black with coarse punctures (Figs. 2.31 –38).</p><p>This species group has been studied recently by Arriaga-Jiménez <i>et al.</i> (2020), within which they established the <i>O. anthracinus</i> species complex. According to Arriaga-Jiménez <i>et al.</i> (2020), the <i>O. landolti</i> species group comprises the following species complexes: <i>O. anthracinus, O. lecontei – O. subopacus</i>, and <i>O. mariozuninoi</i>, plus 18 unassigned taxa to species complexes. The <i>O. landolti</i> 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 –38).</p><p>In their <i>Onthophagus</i> analysis, Emlen <i>et al.</i> (2005: fig. 4) indicated that a branch formed by <i>O. coscineus</i> and <i>O. knulli</i> Howden & Cartwright (a member of the <i>O. landolti</i> species group) has a sister relationship with a branch formed by <i>O. orpheus</i> and <i>O. hecate</i> (no Bayesian posterior probability reported), thus supporting a relationship between the <i>O. landolti</i> and <i>O. hecate</i> species groups as suggested by this barcode study (Figs. 1–2). O. <i>knulli</i> has since been synonymized with <i>O. durangoensis</i> Balthasar by Arriaga-Jiménez <i>et al.</i> (2020). This last species is a member of the <i>O. anthracinus</i> species complex. On the other hand, Breeschoten <i>et al.</i> (2016) recovered in their study an <i>O. landolti</i> 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), bootstrap (Fig. 8), and partition (Fig. 9) analyses also suggest the existence of an <i>O. landolti</i> species group with a bootstrap value of 19. This low support node value suggests a similar situation as the one observed for the <i>O. hoepfneri</i> species group. It is highly possible that more species groups shall emerge from the <i>O. landolti</i> 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).</p> |
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| publishDate | 2025 |
| publisher | Zenodo |
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| spellingShingle | Onthophagus landolti Harold 1880 Kohlmann, Bert Solís, Ángel Biodiversity Taxonomy Animalia Arthropoda Insecta Coleoptera Scarabaeidae Onthophagus Onthophagus landolti <p><b><i>Onthophagus landolti</i> species group</b>.</p><p>This group is diagnosed by the male having no head horns (Fig. 5.14); male protibial apex with a tuft of long setae (Figs. 1.31 –38); pronotum with a small central protuberance (Fig. 5.14); metafemur brown to black with coarse punctures (Figs. 2.31 –38).</p><p>This species group has been studied recently by Arriaga-Jiménez <i>et al.</i> (2020), within which they established the <i>O. anthracinus</i> species complex. According to Arriaga-Jiménez <i>et al.</i> (2020), the <i>O. landolti</i> species group comprises the following species complexes: <i>O. anthracinus, O. lecontei – O. subopacus</i>, and <i>O. mariozuninoi</i>, plus 18 unassigned taxa to species complexes. The <i>O. landolti</i> 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 –38).</p><p>In their <i>Onthophagus</i> analysis, Emlen <i>et al.</i> (2005: fig. 4) indicated that a branch formed by <i>O. coscineus</i> and <i>O. knulli</i> Howden & Cartwright (a member of the <i>O. landolti</i> species group) has a sister relationship with a branch formed by <i>O. orpheus</i> and <i>O. hecate</i> (no Bayesian posterior probability reported), thus supporting a relationship between the <i>O. landolti</i> and <i>O. hecate</i> species groups as suggested by this barcode study (Figs. 1–2). O. <i>knulli</i> has since been synonymized with <i>O. durangoensis</i> Balthasar by Arriaga-Jiménez <i>et al.</i> (2020). This last species is a member of the <i>O. anthracinus</i> species complex. On the other hand, Breeschoten <i>et al.</i> (2016) recovered in their study an <i>O. landolti</i> 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), bootstrap (Fig. 8), and partition (Fig. 9) analyses also suggest the existence of an <i>O. landolti</i> species group with a bootstrap value of 19. This low support node value suggests a similar situation as the one observed for the <i>O. hoepfneri</i> species group. It is highly possible that more species groups shall emerge from the <i>O. landolti</i> 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).</p> |
| title | Onthophagus landolti Harold 1880 |
| topic | Biodiversity Taxonomy Animalia Arthropoda Insecta Coleoptera Scarabaeidae Onthophagus Onthophagus landolti |
| url | https://doi.org/10.5281/zenodo.15225845 |