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30 results for “Streblopus”
Fig. 15. Protibiae. A‒D. Dorsal view. A‒B. Streblopus opatroides van Lansberge, 1874. A in Systematics of the enigmatic South American Streblopus Van Lansberge, 1874 dung beetles and their transatlantic origin: a case study on the role of dispersal events in the biogeographical history of the Scarabaeinae (Coleoptera: Scarabaeidae)
Fig. 15. Protibiae. A‒D. Dorsal view. A‒B. Streblopus opatroides van Lansberge, 1874. A. ♂. B. ♀. C‒D. S. punctatus (Balthasar, 1938). C. ♂. D. ♀. E‒H. Ventral view. E‒F. S. opatroides. E. ♂. F. ♀. G‒H. S. punctatus. G. ♂. H. ♀. Notice the many differences between the species and sexes, in particular the presence of a protibial spur in males of S. punctatus (and its absence in S. opatroides) and the different shapes of the spurs and of the lateral teeth in females of the two species.
Fig. 11 in Systematics of the enigmatic South American Streblopus Van Lansberge, 1874 dung beetles and their transatlantic origin: a case study on the role of dispersal events in the biogeographical history of the Scarabaeinae (Coleoptera: Scarabaeidae)
Fig. 11. Labium of Streblopus opatroides van Lansberge, 1874 (left palpus removed). A. Ventral view (aboral surface). B. Dorsal view (oral surface). C. Lateral view. D. Removed left palpus. Note the unusual shape of the palpus, with the basal palpomere remarkably enlarged. Abbreviations: gl = glossa; glf = glossal flap; lbpl = labial palp; lshpx = lateral hypopharyngeal sclerite; mt = mentum; pmts = premental sclerite; shp = suspensorium of hypopharynx; vapmts = ventral angles of premental sclerites.
Fig. 4 in Systematics of the enigmatic South American Streblopus Van Lansberge, 1874 dung beetles and their transatlantic origin: a case study on the role of dispersal events in the biogeographical history of the Scarabaeinae (Coleoptera: Scarabaeidae)
Fig. 4. Distribution of Streblopus van Lansberge, 1874. Note how the two species are widely separated by the vast South American Dry Diagonal stretching between Amazonia and the Atlantic Forest. During several different times over the Neogene, forest corridors connected the two biomes and the populations of Streblopus could move from one to the other. When the forest retreated, the distribution of the genus became relict.
Fig. 10 in Systematics of the enigmatic South American Streblopus Van Lansberge, 1874 dung beetles and their transatlantic origin: a case study on the role of dispersal events in the biogeographical history of the Scarabaeinae (Coleoptera: Scarabaeidae)
Fig. 10. Maxillae of Streblopus opatroides van Lansberge, 1874. A. Dorsal view with extended lacinia. B. Dorsal view. C. Ventral view. Abbreviations: car = cardo; darsgal = dorsal articular sclerite of galea; gal = galea; lac = lacinia; mxpl = maxillary palpus; prcar = articular process of cardo; ss1–4 = stipal sclerite 1–4; varsgal = ventral articular sclerite of galea.
Fig. 6. Head. A‒B. Clypeal process. A. Streblopus opatroides van Lansberge, 1874. B. S in Systematics of the enigmatic South American Streblopus Van Lansberge, 1874 dung beetles and their transatlantic origin: a case study on the role of dispersal events in the biogeographical history of the Scarabaeinae (Coleoptera: Scarabaeidae)
Fig. 6. Head. A‒B. Clypeal process. A. Streblopus opatroides van Lansberge, 1874. B. S. punctatus (Balthasar, 1938). C. Ventral view of head, S. opatroides.
Fig. 8. Labrum. A‒B. Streblopus opatroides van Lansberge, 1874. A in Systematics of the enigmatic South American Streblopus Van Lansberge, 1874 dung beetles and their transatlantic origin: a case study on the role of dispersal events in the biogeographical history of the Scarabaeinae (Coleoptera: Scarabaeidae)
Fig. 8. Labrum. A‒B. Streblopus opatroides van Lansberge, 1874. A. Aboral surface (dorsal view). B. Oral surface (ventral view; epipharynx). C‒D. S. punctatus (Balthasar, 1938). C. Aboral surface. D. Oral surface. Note the many differences between the two species, particularly the much denser and shorter setation of the median area in S. punctatus, the much longer median brush of S. opatroides and the dissimilarities in the shape of the anterior epypharingeal margin. The black arrow shows the anterior margin of the labrum, while the red arrow indicates the anterolateral region. Abbreviations: afr = apical fringe of labrum; ampr = antero-median process of labral suspensorium; lf = lateral files; mbr = medial brush of labrum; pmpr = postero-median process of labral suspensorium; ppm = proplegmatium; ssma = socketed setae of median area; topr = tormal process of labral suspensorium.
Fig. 9 in Systematics of the enigmatic South American Streblopus Van Lansberge, 1874 dung beetles and their transatlantic origin: a case study on the role of dispersal events in the biogeographical history of the Scarabaeinae (Coleoptera: Scarabaeidae)
Fig. 9. Mandibles of Streblopus opatroides van Lansberge, 1874. A‒B. Ventral view. A. Left mandible. B. Right mandible. C. Lateral view of right mandible. Abbreviations: apmm = apodemes of mandibular muscles; cmb = comb of incisor lobe of mandible; conj = conjunctivus of mandible; inlb = incisor lobe of mandible; mac = mandibular acetabulum; molb = molar lobe of mandible.
Fig. 7. Antennae. A. Streblopus opatroides van Lansberge, 1874. B. S in Systematics of the enigmatic South American Streblopus Van Lansberge, 1874 dung beetles and their transatlantic origin: a case study on the role of dispersal events in the biogeographical history of the Scarabaeinae (Coleoptera: Scarabaeidae)
Fig. 7. Antennae. A. Streblopus opatroides van Lansberge, 1874. B. S. punctatus (Balthasar, 1938). Note the differences between the two species concerning the colour of the apical flagellomeres and the number and shape of the articles. In S. punctatus, the suppression of arthrogenesis between ancestral articles III and IV has resulted in a reduction of the total number of antennomeres from 9 to 8.
Fig. 2 in Systematics of the enigmatic South American Streblopus Van Lansberge, 1874 dung beetles and their transatlantic origin: a case study on the role of dispersal events in the biogeographical history of the Scarabaeinae (Coleoptera: Scarabaeidae)
Fig. 2. Geographical variation in Streblopus opatroides van Lansberge, 1874. Individuals from a few localities in southeast Bahia (Maraú and Uruçuca) have a different ventral colouration from individuals belonging to other populations, being much darker and not showing the typical red metallic colouration seen in specimens from other localities in Bahia and Espírito Santo.
Fig. 5. Head. A‒D. Dorsal view. A‒B. Streblopus opatroides van Lansberge, 1874. A in Systematics of the enigmatic South American Streblopus Van Lansberge, 1874 dung beetles and their transatlantic origin: a case study on the role of dispersal events in the biogeographical history of the Scarabaeinae (Coleoptera: Scarabaeidae)
Fig. 5. Head. A‒D. Dorsal view. A‒B. Streblopus opatroides van Lansberge, 1874. A. ♂. B. ♀. C‒D. S. punctatus (Balthasar, 1938). C. ♂. D. ♀. Note how the emargination of the apex of the clypeus varies between the species and sexes, being greater in males of S. opatroides than in males of S. punctatus and females of both sexes. E‒F. Lateral view. E. S. opatroides. F. S. punctatus. Red arrow indicates the canthus. Observe that the canthus is much longer in S. opatroides than in S. punctatus.
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