Dichotomius (Dichotomius) boreus
Fuente:
Zenodo
Gespeichert in:
| Hauptverfasser: | , |
|---|---|
| Format: | Recurso digital |
| Veröffentlicht: |
Zenodo
2025
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866901120077529088 |
|---|---|
| author | Arias-Buriticá, Jorge Armando Vaz-de-Mello, Fernando Zagury |
| author_facet | Arias-Buriticá, Jorge Armando Vaz-de-Mello, Fernando Zagury |
| contents | <p><b>2. Dichotomius (Dichotomius) boreus (Olivier, 1789) species group</b></p><p><b>Diagnosis:</b> The species of the D. boreus species group are recognized by the following combination of characters: (1) Medium-sized to large-sized individuals (16.6–27.1 mm). (2) Head oval and twice as wide as it is long (Fig. 7a, b). (3) Clypeus with two inconspicuous clypeal teeth, sometimes imperceptible (Fig. 7a, b). (4) Ventral clypeal process with invagination and then a conical process obtuse or acute tip (Fig. 7c). (5) Both sexes with two cephalic process, the first one located in the clypeal region and the second one in the fronto-clypeal region (Fig. 7a, b). (6) Protibial spur not angled or slightly angled near the apex (Fig. 7d). (7) Pronotum with an excavation in the anterior area that can go from 1/3 to half of it and laterally to more than 2/3 of the pronotum (Fig. 7a, b). (8) Pronotum with central process with different shapes according to the species. (9) Pronotal process with two humps with spine shape above the lateral foveae. (10) Posterior margin of pronotum with ocellate punctures, sometimes denser in the posteromedial area (Figs.2a, b, 7a, b). (11) Elytral striae bicarinate, shallow to distinctly impressed and with punctate interestriae. (12) Pygidium with complete apical margin and evident punctures (Fig. 7e) (13). Aedeagus lacking subgenital plate (Fig. 7h). (14) Parameres subtriangular in lateral view (Fig. 7f), without setae in the apical area (Fig. 7 f-h). (15) ME well sclerotized, large, and asymmetrical (Fig. 7l).</p><p><b>Composition:</b> Six valid species: Dichotomius boreus (Olivier, 1789), D. carinatus (Luederwaldt, 1925), D.podalirius (Felsche, 1901), D. prietoi Martínez & Martínez, 1982, D. pelamon (Harold, 1869), D.quadrilobatus Chamorro et al., 2021, and two undescribed species.</p><p><b>Geographic distribution:</b> Pacific dominion (Sabana province), Boreal brazilian dominion (all provinces), South Brazilian dominion (all provinces), Chacoan subregion Southeastern Amazonian dominion (Xingu-Tapajós province), and South American Transition zones (Páramo province) (Fig. 6b).</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_16975099 |
| institution | Zenodo |
| language | |
| publishDate | 2025 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Dichotomius (Dichotomius) boreus Arias-Buriticá, Jorge Armando Vaz-de-Mello, Fernando Zagury Biodiversity Taxonomy Animalia Arthropoda Insecta Coleoptera Scarabaeidae Dichotomius Dichotomius boreus <p><b>2. Dichotomius (Dichotomius) boreus (Olivier, 1789) species group</b></p><p><b>Diagnosis:</b> The species of the D. boreus species group are recognized by the following combination of characters: (1) Medium-sized to large-sized individuals (16.6–27.1 mm). (2) Head oval and twice as wide as it is long (Fig. 7a, b). (3) Clypeus with two inconspicuous clypeal teeth, sometimes imperceptible (Fig. 7a, b). (4) Ventral clypeal process with invagination and then a conical process obtuse or acute tip (Fig. 7c). (5) Both sexes with two cephalic process, the first one located in the clypeal region and the second one in the fronto-clypeal region (Fig. 7a, b). (6) Protibial spur not angled or slightly angled near the apex (Fig. 7d). (7) Pronotum with an excavation in the anterior area that can go from 1/3 to half of it and laterally to more than 2/3 of the pronotum (Fig. 7a, b). (8) Pronotum with central process with different shapes according to the species. (9) Pronotal process with two humps with spine shape above the lateral foveae. (10) Posterior margin of pronotum with ocellate punctures, sometimes denser in the posteromedial area (Figs.2a, b, 7a, b). (11) Elytral striae bicarinate, shallow to distinctly impressed and with punctate interestriae. (12) Pygidium with complete apical margin and evident punctures (Fig. 7e) (13). Aedeagus lacking subgenital plate (Fig. 7h). (14) Parameres subtriangular in lateral view (Fig. 7f), without setae in the apical area (Fig. 7 f-h). (15) ME well sclerotized, large, and asymmetrical (Fig. 7l).</p><p><b>Composition:</b> Six valid species: Dichotomius boreus (Olivier, 1789), D. carinatus (Luederwaldt, 1925), D.podalirius (Felsche, 1901), D. prietoi Martínez & Martínez, 1982, D. pelamon (Harold, 1869), D.quadrilobatus Chamorro et al., 2021, and two undescribed species.</p><p><b>Geographic distribution:</b> Pacific dominion (Sabana province), Boreal brazilian dominion (all provinces), South Brazilian dominion (all provinces), Chacoan subregion Southeastern Amazonian dominion (Xingu-Tapajós province), and South American Transition zones (Páramo province) (Fig. 6b).</p> |
| title | Dichotomius (Dichotomius) boreus |
| topic | Biodiversity Taxonomy Animalia Arthropoda Insecta Coleoptera Scarabaeidae Dichotomius Dichotomius boreus |
| url | https://doi.org/10.5281/zenodo.16975099 |