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FIGURE 5 in A new species of Knodus (Characiformes: Characidae: Stevardiinae) from the rio Aripuanã, rio Madeira basin, Brazil

FIGURE 5 | Map of northern South America showing collection site of Knodus angustus in the rio Aripuanã, rio Madeira basin.

opencc-by-4.0Jun 2020View details →

FIGURE 3 in A new species of Knodus (Characiformes: Characidae: Stevardiinae) from the rio Aripuanã, rio Madeira basin, Brazil

FIGURE 3 | Knodus angustus, MZUSP 124932, sexually mature male; pelvic-fin rays, ventral view, left side showing pelvic-fin hooks.

opencc-zeroJan 2024View details →

Linked collectors and determiners for: A new species of Creagrutus (Characidae: Stevardiinae) from the upper Río Magdalena, Colombia.

Natural history specimen data linked to collectors and determiners held within, "A new species of Creagrutus (Characidae: Stevardiinae) from the upper Río Magdalena, Colombia". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/164eb057-9bef-44cc-bfb3-9edb59d2dc50">https://bionomia.net/dataset/164eb057-9bef-44cc-bfb3-9edb59d2dc50</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/164eb057-9bef-44cc-bfb3-9edb59d2dc50">https://gbif.org/dataset/164eb057-9bef-44cc-bfb3-9edb59d2dc50</a>. Formatted as a Frictionless Data package.

Fig. 14 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 14. Spermatozoa of Piabina argentea. A: Longitudinal section of spermatozoon. Note the position of the nucleus (n) in relation to the flagellar axis and to proximal (p) and distal (d) centrioles, the eccentric position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). B: Detail of the centriolar complex. Note the position of the centrioles to one another. C-E: Cross sections at the middle of the nucleus (n) and at different levels of the strongly asymmetric midpiece exposing the lateral position of the centrioles, cytoplasmic canal (*), the flagellum (f), and the distribution of the few elongate mitochondria (m) accumulated in larger portion of the midpiece.

Fig. 9 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 9. Spermatozoa of Cyanocharax alburnus. A-C: Longitudinal sections of spermatozoa. Note the lateral position of the nucleus (n) in relation to the flagellar axis, the eccentric position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). D-G: Cross sections through the middle of the nucleus and at different levels of the strongly asymmetric midpiece exposing the lateral position of the centriole (c), cytoplasmic canal (*) and of the flagellum (f), the distribution of the few long mitochondria (m) accumulated in larger portion of the midpiece, a possible endomembrane system and a few vesicles peripherally distributed (v).

Fig. 7 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 7. Spermatozoa of Ceratobranchia obtusirostris. A-B: Longitudinal sections of spermatozoa. Note the lateral position of the nucleus (n) in relation to the flagellar axis and to proximal (p) and distal (d) centrioles,, the eccentric position of the double nuclear fossa (double arrow), the midpiece containing the endomembrane system (v) and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). C-D: Cross sections at different levels of the nucleus (n) exposing the lateral position of the cytoplasmic canal (*) and flagellum (f), the distribution of the few elongate mitochondria (m) accumulated in larger portion of the midpiece.

Fig. 5 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 5. Spermatozoa of Bryconacidnus ellisi. A-B: Longitudinal sections of spermatozoa. Note the lateral position of the nucleus (n) in relation to the flagellar axis and to proximal (p) and distal (d) centrioles, the eccentric position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). The lacy-like endomembrane system (v) is distributed throughout the midpiece. C-E: Cross sections through the middle of the nucleus and at different levels of the strongly asymmetric midpiece, exposing the lateral position of the cytoplasmic canal (*) and flagellum (f), the distribution of the few long mitochondria (m) accumulated in larger portion of the midpiece.

Fig. 4 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 4. Spermatozoon of Boehlkea fredcochui. A-B: Longitudinal sections of spermatozoa. Note the position of the nucleus (n) in relation to the flagellar axis and to proximal (p) and distal (d) centrioles, the position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). The lacy aspect of an endomembrane system and a few vesicles (v) peripherally distributed from the tip of nucleus to the midpiece end. C-K: Cross sections from the middle to the base of the nucleus and at different levels of the strongly asymmetric midpiece exposing the lateral position of the centriole (c), cytoplasmic canal (*) and of the flagellum (f), the distribution of the few elongate mitochondria (m) accumulated in the larger portion of the midpiece.

Fig. 1 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 1. Scheme of measurement of the nuclear rotation during spermiogenesis in the subfamily Stevardiinae (d): Distal centriole; (p): Proximal centriole; (n): Nucleus; (m): Mitochondria; (f): Flagellum; (*): Cytoplasmic canal, and (arrow): Angle.

Fig. 3 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 3. Scheme of spermiogenesis in the subfamily Stevardiinae. Schematics drawings of longitudinal sections from early to late spermatids. Note from A to D the nuclear rotation toward the flagellar axis, the position of the proximal (p) and distal (d) centrioles, and the dislocation of the mitochondria (m) and cytoplasm to the flagellar portion, forming the midpiece of the spermatozoa. (n): Nucleus; (f): Flagellum; (v): Vesicles, and (*): Cytoplasmic canal.

Fig. 8 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 8. Spermatozoa of Creagrutus meridionalis. A-C: Longitudinal sections of spermatozoa. Note the lateral position of the nucleus (n) in relation to the flagellar axis and to proximal (p) and distal (d) centrioles, the position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). D-K: Cross sections through the middle of the nucleus and at different levels of the strongly asymmetric midpiece exposing the lateral position of the cytoplasmic canal (*) and of the flagellum (f), the distribution of the few elongate mitochondria (m) accumulated in larger portion of the midpiece, the lacy aspect of the endomembrane system and a few vesicles peripherally distributed in the midpiece (v).

Fig. 15 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 15. Spermatozoa of Rhinobrycon negrensis. A: Longitudinal section of spermatozoa. Note the position of the nucleus (n) in relation to the flagellar axis and to proximal (p) and distal (d) centrioles, the eccentric position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). B-C: Longitudinal sections of the midpiece exposing the lateral position of the distal centriole (d), the cytoplasmic canal (*) and the flagellum (f), the distribution of the few elongate mitochondria (m) accumulated in larger portion of the midpiece, few large vesicles peripherally distributed (v). D-E: Cross sections at different levels of the asymmetric midpiece showing the mitochondria (m) and a few vesicles (v). Information on the endomembrane system was not preserved due the specimens of R. negrensis herein analysis have been obtained from ichthyological collections.

Fig. 11 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 11. Spermatozoa of Knodus meridae. A-D: Longitudinal sections of spermatozoa. Note the lateral position of the nucleus (n) in relation to the flagellar axis and to proximal (p) and distal (d) centrioles, the eccentric position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). E: Elongate mitochondria (m) and vesicles (v) are located in larger portion of the midpiece.

Fig. 2 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 2. Spermiogenesis in the subfamily Stevardiinae. Longitudinal sections from early (A, C, E) to late spermatids (B, D, F) of Creagrutus meridionalis (A, B), Bryconamericus exodon (C, D), and Piabina anhembi (E, F). Note from A to F the nuclear rotation toward the flagellar axis. (d): Distal centriole; (p): Proximal centriole; (n): Nucleus; (m): Mitochondria; (f): Flagellum, and (*): Cytoplasmic canal.

Fig. 13 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 13. Spermatozoa of Piabina anhembi. A: Longitudinal section of spermatozoon. Note the position of the nucleus (n) in relation to the flagellar axis and to proximal (p) and distal (d) centrioles, the position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). B-C: Cross sections at different levels of the nucleus showing large vesicles (v) in the surrounding cytoplasmic layer and the lateral position of the centriole (c). E-K: Cross sections at different levels of the strongly asymmetric midpiece, from the base of the nucleus (n) to the midpiece end exposing the cytoplasmic canal (*), and of the flagellum (f), the distribution of the few elongate mitochondria (m) accumulated in larger portion of the midpiece, and a few vesicles peripherally distributed in the midpiece (v).

Fig. 12 in Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae)

Fig. 12. Spermatozoa of Odontostoechus lethostigmus. A-B: Longitudinal sections of spermatozoa. Note the position of the nucleus (n) in relation to the flagellar axis and to proximal (p) and distal (d) centrioles, the eccentric position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). C: Oblique section of the midpiece showing the alveolar aspect of endomembrane system (v). D-F: Cross sections at different levels of the strongly asymmetric midpiece, from the base of the nucleus (n) to the midpiece end exposing the lateral position of the cytoplasmic canal (*) and flagellum (f), and the distribution of the few elongate mitochondria (m) accumulated in larger portion of the midpiece. G: Cross section of the flagella with the classic axoneme (a).

Fig. 15 in A new genus and two new species of Stevardiinae (Characiformes: Characidae) with a hypothesis on their relationships based on morphological and histological data

Fig. 15. Histological section carried out through caudal-fin of Hysteronotus megalostomus (MZUSP 85978, 34.9 mm SL); A: 10x magnification; B: 40x magnification; sc = scales; mc = mucous cells; br = branched ray. Scale bar = 20 μm.

Fig. 14 in A new genus and two new species of Stevardiinae (Characiformes: Characidae) with a hypothesis on their relationships based on morphological and histological data

Fig. 14. Spermatozoa of Lepidocharax diamantina (MNRJ 21997, 34.7 mm SL) A: Longitudinal section of spermatozoa. Note the position of the nucleus (n) in relation to the flagellar axis, the position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) into which is the initial segment of the flagellum (f). B-C: Cross sections at different levels of the nucleus showing large vesicles (v) in the surrounding cytoplasmic layer. D-F: Cross sections at different levels of the strongly asymmetric midpiece, from the base of the nucleus (n) to the midpiece end exposing the cytoplasmic canal (*) and the distribution of the few elongate mitochondria (m) accumulated in the major portion of the midpiece. G: Cross section of the flagella with the classic axoneme (a).

Fig. 12 in A new genus and two new species of Stevardiinae (Characiformes: Characidae) with a hypothesis on their relationships based on morphological and histological data

Fig. 12. Spermatozoa of Planaltina myersi (MZUSP 100642, 32.1 mm SL). A: Longitudinal section of spermatozoa. Note the lateral position of the nucleus (n) in relation to the flagellar axis, the midpiece and the cytoplasmic canal (*) into which is the initial segment of the flagellum (f). Inset: The proximal centriole is anterior and in an obtuse angle in relation to the distal centriole. Innumerable fibrils or striated centriolar rootlets radiate from the distal centriole (p), surround the tip of the nucleus forming a thick cap. B-E: Cross sections at different levels of the nucleus showing the lateral position of the distal centriole (c). F-G: Cross sections at different levels of the strongly asymmetric midpiece with some spherical mitochondria (m) accumulated in major portion.

Fig. 13 in A new genus and two new species of Stevardiinae (Characiformes: Characidae) with a hypothesis on their relationships based on morphological and histological data

Fig. 13. Spermatozoa of Lepidocharax burnsi (MCP 34828, paratype, 31.9 mm SL) A: Longitudinal section of spermatozoa. Note the lateral position of the nucleus (n) in relation to the flagellar axis, the midpiece and the cytoplasmic canal (*) into which is the initial segment of the flagellum (f). The distal and proximal centrioles are outside the single and shadow nuclear fossa. Inset: The centriolar complex is associated at the tip of the nucleus. B-D: Cross sections at different levels of the nucleus showing the lateral position of the distal centriole (c) and the flagellum (f). E-G: Cross sections at different levels of the strongly asymmetric midpiece with some spherical mitochondria (m) accumulated in the major portion. H: Cross section of the flagella with the classic axoneme (a).