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901 results for “Amazon Basin”
FIGURE 1 in Potamotrygon tigrina, a new species of freshwater stingray from the upper Amazon basin, closely related to Potamotrygon schroederi Fernandez-Yépez, 1958 (Chondrichthyes: Potamotrygonidae)
FIGURE 1. Holotype of Potamotrygon tigrina, n. sp., in dorsal (A) and ventral (B) views (MUSM 39978, juvenile male, Río Nanay, near Iquitos, Peru; 495 mm TL, 271 mm DL, and 258 mm DW).
FIGURE 26 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 26. Cladogram depicting relationships among genera of Potamotrygonidae, showing sister group relationship between Heliotrygon and Paratrygon, based on discussion in the text (see Phylogenetic relationships of Heliotrygon for characters at indicated nodes and for Heliotrygon). For a discussion of myliobatiform phylogeny, see Carvalho et al. (2004) and references cited therein.
FIGURE 15 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 15. Illustration of Heliotrygon rosai, n. sp., in dorsal (A) and ventral (B) views (MZUSP 63604, juvenile male, Rio Purus, Amazonas state, Brazil, 680 mm TL, 247 mm DL, 231 mm DW). Note that dorsal color pattern has faded significantly in this specimen.
FIGURE 25 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 25. Cranial, mandibular, and hyoid muscles of Heliotrygon rosai, n. sp. (from MZUSP 108295). Specimen is facing right. Notice that pre- and postorbital processes, nasal capsules, and part of rostral region were cut. Specimen is in dorsolateral view. Abbreviations: HYO, hyomandibula; LH, levator hyomandibularis; LLS, levator labii superioris; LP, levator palatoquadrati; MC, Meckel's cartilage; PQ, palatoquadrate; SM, spiracularis medialis; SL, spiracularis lateralis. Asterisk indicates position of eye.
FIGURE 22 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 22. Aspects of the splanchnocranium, scapulocoracoid, and pectoral fin skeleton (A), and puboischiadic bar (B) of Heliotrygon gomesi, n. sp., in dorsoventral view (based on CU 78456). Abbreviations: AOC, antorbital cartilage; EPI 5, fifth epibranchial element; FPF, frontoparietal fontanelle; HYO, hyomandibula; IP, iliac process; ISP, ischial process; Mc, Meckel's cartilage; MPP, median prepelvic process; NC, nasal capsule; PCF, precerebral fontanelle; POP, postorbital process; PSC, prespiracular cartilage; PRP, preorbital process; SCP, scapular process; SP, supraorbital process. Arrow in (B) depicts very reduced and blunt lateral prepelvic process.
FIGURE 11 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 11. Holotype of Heliotrygon rosai, n. sp., in dorsal (A) and ventral (B) views (MZUSP 104996, adult male, Baía de Marajó, Pará state, Brazil; 984 mm TL, 604 mm DL, 577 mm DW).
FIGURE 19 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 19. Ventral lateral-line canals of a specimen of Heliotrygon gomesi, n. sp. (paratype MZUSP 108203). Color scheme is as follows: anterior subpleural tubules, hyomandibular subpleural component (at level of first pair of gill slits) and hyomandibular canal (purple); hyomandibular jugular component (yellow); nasal canal (light blue); prenasal component of nasal canal (green); suborbital component of infraorbital canal (light red); supraorbital canal (dark blue).
FIGURE 8 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 8. Morphological details of holotype of Heliotrygon gomesi, n. sp. A) Eyes and spiracles. B) Nasoral region. C) Dorsal tail region. D) Ventral view of pelvic fins and base of tail.
FIGURE 5 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 5. Paratype of Heliotrygon gomesi, n. sp., in dorsal (A) and ventral (B) views (MZUSP 108203, juvenile female, Rio Nanay, Rio Amazonas basin, Iquitos, Peru; 494 mm TL, 290 mm DL, and 269 mm DW). Dissected ventrally for parasites and for DNA extraction.
FIGURE 1 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 1. Holotype of Heliotrygon gomesi, n. sp., in dorsal (A) and ventral (B) views (MZUSP 104988, adult female, Rio Jamari, Amazonas state, Brazil; 836 mm TL, 624 mm DL, and 578 mm DW). Ventral dissections were made to remove parasites and for DNA extraction.
FIGURE 2 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 2. Paratype of Heliotrygon gomesi, n. sp., in dorsal (A) and ventral (B) views (AMNH 251884, adult female, Rio Nanay, Rio Amazonas, Iquitos, Peru; 684 mm TL, 557 mm DL, and 537 mm DW).
FIGURE 7 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 7. Illustration of Heliotrygon gomesi, n. sp., in dorsal view (based on AMNH 58402; see Figure 6).
FIGURE 13 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 13. Illustration of paratype of Heliotrygon rosai, n. sp., in dorsal view (based on AMNH 251885; see Figure 12).
FIGURE 24 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 24. Clasper morphology of Heliotrygon rosai, n. sp. A) External morphology (holotype, MZUSP 104996). B) Clasper skeleton in dorsal view (MZUSP 108295). C) Clasper skeleton in ventral view (MZUSP 108295). Anterior facing top of page. Abbreviations: AT, accessory terminal cartilage; AX, axial cartilage; BE, beta cartilage; B1, first basal segment; B2, second basal segment; CG, clasper groove; DM, dorsal marginal cartilage; DPS, dorsal pseudosiphon; DT2, dorsal terminal 2 cartilage; VM, ventral marginal cartilage; VPS, ventral pseudosiphon; VT, ventral terminal cartilage.
FIGURE 27 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 27. Single most parsimonious tree showing phylogenetic relationships among Neotropical freshwater stingray genera based on 637 base pairs of the mitochondrial cytochrome b gene. Numbers above nodes denote bootstrap proportions> 50%; branch lengths proportional to character changes based on DELTRAN optimization; CI = 0.73, RI = 0.75, tree length = 315.
FIGURE 23 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 23. Morphological details of Heliotrygon gomesi, n. sp., in dorsoventral view (based on CU 78456). A) Splanchnocranium, scapulocoracoid, pectoral basal elements, and anterior disc radials. Notice arrangement of dermal denticles on anteromedial disc region. B) Detail of anterolateral disc region, showing transition to bifurcating radials, usually at 8-9th radial (counting from propterygium). C) Detail of dorsal tail base region showing specific pattern of dermal denticles.
FIGURE 6 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 6. Specimen of Heliotrygon gomesi, n. sp., probably from Ecuador, in dorsal (A) and ventral (B) views (AMNH 58402, preadult male, 422 mm TL, 361 mm DL, and 345 mm DW).
FIGURE 9 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 9. Dorsal tail region depicting morphology of caudal sting of Heliotrygon gomesi, n. sp. A) AMNH 104988, paratype, adult female. B) MZUSP 104988, holotype, adult female. Notice faint, blunt serrations in (B). Anterior facing right. Scale = 5 mm.
FIGURE 10 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 10. Geographic distribution of Heliotrygon gomesi, n. sp. Star depicts approximate locality of holotype. Question mark represents AMNH 58402 (Ecuador).
FIGURE 12 in Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)
FIGURE 12. Paratype of Heliotrygon rosai, n. sp., in dorsal (A) and ventral (B) views (AMNH 251885, preadult male, Rio Nanay, Rio Amazonas basin, Iquitos, Peru; 599 mm TL, 500 mm DL, 483 mm DW).
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