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Fig. 1 in Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

Fig. 1. Potamotrygon motoro. Dorsal (a) and ventral (b) views of lectotype, NMW 78655, juvenile male, 208 mm DW, Guaporé River.

Fig. 16 in Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

Fig. 16. Potamotrygon motoro. Dorsal and ventral views of neurocranium and mandibular arch of specimen MZUSP 110908 showing mandibular arch structures. Abbreviations: AAC, anterior angular cartilage; CL, calcified ligament; DLP, dorsolateral process; HYO, hyomandibula; MC, Meckel's cartilage; PAC, posterior angular cartilage; PQ, palatoquadrate.

Fig. 13 in Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

Fig. 13. Potamotrygon motoro. Ventral canals of lateral line system in an adult female, MZUSP 111908, 343 mm DW. Abbreviations: hyc, hyomandibular canal; ioc, infraorbital canal; mnc, mandibular canal; nas, nasal canal; suc, supraorbital canal; ach, angular component of hyomandibular canal; iol, infraorbital loop; jch, jugular component of hyomandibular canal; nil, nasointernal loop; onc, orbitonasal component of supraorbital canal; pnc, prenasal component of nasal canal; pnl, prenasal loop; pst, posterior subpleural tubule; sbr, subrostral component of supraorbital canal; sol, suborbital loop; spc, subpleural component of hyomandibular canal; spl, subpleural loop; spt, subpleural tubules; sub, suborbital component of infraorbital canal.

Fig. 14 in Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

Fig. 14. Potamotrygon motoro. Neurocranium of an adult male specimen, MZUSP 111905, 310 mm DW, in (a) dorsal, (b) ventral, (c) lateral and (d) posterior views. Abbreviations: ACVF, anterior cerebral vein foramen; AFP I and II, anterior foramen of preorbital canal I and II; AOC, antorbital cartilage condyle; AS, articular surface; ELF, endolymphatic foramen; EPB, epiphysial bar; ESAF, efferent spiracular artery foramen; FPF, frontoparietal fontanelle; FM, foramen magnum; HF, hyomandibular facet; ICAF, internal carotid artery foramen; NA, nasal aperture; NC, nasal capsule; OC, occipital condyle; OF, orbital fissure; PCF, precerebral fontanelle; PFP I and II, posterior foramen of preorbital canal I and II; PFL, perilymphatic foramen; POP, postorbital process; PRP, preorbital process; SOC, supraorbital crest; SP, supraorbital process; II, optic nerve foramen; IV, trochlear nerve foramen; VII, facial nerve foramen; X, vagus nerve foramen.

Fig. 20 in Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

Fig. 20. Distribution of Potamotrygon motoro in the ParanáParaguay system. Yellow circles show localities where specimens of P. motoro were examined in this study. Yellow star indicates Guaporé River, the type locality of P. motoro.

Fig. 12 in Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

Fig. 12. Potamotrygon motoro. (a) dorsal view of tail showing entire dorsal row of pointed spines and the well-developed lateral rows in an adult female, MZUSP 110887, 396 mm DW; (b) showing the single row and format of enlarged pointedspines in an adult male, NUP 4136; (c) detail of some enlarged pointed-spines of dorsal row in adult female (MZUSP 110887).

Fig. 15 in Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

Fig. 15.Potamotrygon motoro. Cleared-and-stained neurocranium of a juvenile male specimen (MZUSP 111909, 188 mm DW) in lateral (a) view, showing details of foramina and their locations. Detail of foramina in orbital region (b) and of epiphysial bar in dorsal fontanelle (c). Abbreviations: ACVF, anterior cerebral vein foramen; EPB, epiphysial bar; ES, eye-stalk; ESAF, efferent spiracular artery foramen; FPF, frontoparietal fontanelle; HF, hyomandibular facet; ICAF, internal carotid artery foramen; IVF, interorbital vein foramen; LC, lateral comissure; OF, orbital fissure; PCF, precerebral fontanelle; PCVF, posterior cerebral vein foramen; II, optic nerve foramen; III, oculomotor nerve foramen; IV, trochlear nerve foramen; VII, facial nerve foramen; IX, glossopharyngeal nerve foramen.

Fig. 19 in Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

Fig. 19. Potamotrygon motoro. Dorsal and ventral views of clasper skeletal structures, MZUSP 111905. Abbreviations: AT, accessory terminal; AX, axial cartilage; BE, β-cartilage; B1, basal segment 1; B2, basal segment 2; DM, dorsal marginal cartilage; DT2, dorsal terminal 2 cartilage; VM, ventral marginal cartilage; VT, ventral terminal cartilage.

Fig. 9 in Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

Fig. 9. Potamotrygon motoro. Dorsal view of right clasper of an adult male, NUP 4136. Abbreviations: ap, apopyle; cg, clasper groove; dp, dorsal pseudosiphon; hp, hypopyle; vp, ventral pseudosiphon.

Fig. 8 in Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

Fig. 8. Potamotrygon motoro. Jaws of adult specimens showing dimorphic sexual morphology. Left (a) an adult female, MZUSP 110902, 362 mm DW, and right (b) an adult male, NUP 4136. Note the morphological differences between the teeth of both specimens and between the rows in the same specimen.

Fig. 22 in Systematic revision of the Potamotrygon motoro (Müller & Henle, 1841) species complex in the Paraná-Paraguay basin, with description of two new ocellated species (Chondrichthyes: Myliobatiformes: Potamotrygonidae)

Fig. 22. Detail of dermal denticles in the central dorsal disc region of of MFA 232, a specimen of Potamotrygon motoro designated by Castex (1964) as lectotype of P. pauckei.

Fig. 4 in Karyotype description and evidence of multiple sex chromosome system X X X X /X X Y in Potamotrygon aff. motoro and P. falkneri (Chondrichthyes: Potamotrygonidae) in the upper Paraná River basin, Brazil

Fig. 4. Karyotypes of female (a) and male (b) of Potamotrygon falkneri sample from Porto Rico, highlighting the sex chromosomes after conventional and the chromosomes marked by NOR. Scale bar = 10 m.

Fig. 2 in Karyotype description and evidence of multiple sex chromosome system X X X X /X X Y in Potamotrygon aff. motoro and P. falkneri (Chondrichthyes: Potamotrygonidae) in the upper Paraná River basin, Brazil

Fig. 2. Karyotypes of female (a) and male (b) of Potamotrygon aff. motoro sample from Porto Rico, highlighting the sex chromosomes after conventional and the chromosomes marked by NOR. Scale bar = 10 m.

Fig. 1 in Karyotype description and evidence of multiple sex chromosome system X X X X /X X Y in Potamotrygon aff. motoro and P. falkneri (Chondrichthyes: Potamotrygonidae) in the upper Paraná River basin, Brazil

Fig. 1. Meiotic chromosomes of Potamotrygon falkneri sample from Ilha Solteira. Spermatogonial metaphase (2n = 65 chromosomes) after Giemsa staining (a) and metaphase I, with 31 bivalents and a trivalent (arrow) (b).

Fig. 3 in Karyotype description and evidence of multiple sex chromosome system X X X X /X X Y in Potamotrygon aff. motoro and P. falkneri (Chondrichthyes: Potamotrygonidae) in the upper Paraná River basin, Brazil

Fig. 3. Karyotypes of female (a) and male (b) of Potamotrygon aff. motoro sample from Ilha Solteira, highlighting the sex chromosomes after conventional and the chromosomes marked by NOR. Scale bar = 10 m.

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Fig. 5 in Karyotype description and evidence of multiple sex chromosome system X X X X /X X Y in Potamotrygon aff. motoro and P. falkneri (Chondrichthyes: Potamotrygonidae) in the upper Paraná River basin, Brazil

Fig. 5. Karyotypes of female (a) and male (b) of Potamotrygon falkneri sample from Ilha Solteira, highlighting the sex chromosomes after conventional and the chromosomes marked by NOR. Scale bar = 10 m.

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Fig. 6 in Karyotype description and evidence of multiple sex chromosome system X X X X /X X Y in Potamotrygon aff. motoro and P. falkneri (Chondrichthyes: Potamotrygonidae) in the upper Paraná River basin, Brazil

Fig. 6. Somatic metaphases of Potamotrygon aff. motoro, the population of Porto Rico (a), population of Ilha Solteira (b), identification of constitutive heterochromatin. Metaphases of Potamotrygon falkneri sample from Porto Rico (c) and Ilha Solteira (d), analysis of constitutive heterochromatin after C-banding technique.