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FIGURE 3 in Does soil color affect fish evolution? Differences in color change rate between lineages of the sailfin tetra
FIGURE 3 | A. Representation of the stock tank, with sandy bottom. B. Representation of experimental tank showing the compartments, leaf litter bottom and light bulb. Inner panes: pictures of fish with bright coloration (in stock tank) and dark coloration (after ten minutes of exposure to leaf litter bottom).
FIGURE 2 in Does soil color affect fish evolution? Differences in color change rate between lineages of the sailfin tetra
FIGURE 2 | Map showing the geographical position of the four populations of Crenuchus spilurus used in this study. Shapes represent the two main lineages that each population represents; squares for the Negro lineage and circles for the Amazonas lineage. Classification of lineages follows Pires et al. (2018).
FIGURE 3 in Early ontogeny of tetra Markiana nigripinnis (Characiformes: Characidae)
FIGURE 3 | Morphometric relationships (mm) between A. Standard length and head length, B. Standard length and body depth, C. Standard length and snout-pectoral fin length, D. Standard length and snout-anal fin length, E. Standard length and snout-pelvic fin length, F. Standard length and snout-dorsal fin length during the early development of Markiana nigripinnis.
FIGURE 1 in Early ontogeny of tetra Markiana nigripinnis (Characiformes: Characidae)
FIGURE 1 | Early development of Markiana nigripinnis; A. Yolk-sac larvae (3.6 mm SL) (arrow indicates adhesive organ), B. Preflexion larvae (5.1 mm SL), C. Early flexion larvae (7 mm SL), D. Flexion larvae (8.3 mm SL), E. Early postflexion larvae (12.3 mm SL), F. Postflexion larvae (17 mm SL), G. Juvenile (17.6 mm SL); scale bars = 1 mm.
FIGURE 2 in Early ontogeny of tetra Markiana nigripinnis (Characiformes: Characidae)
FIGURE 2 | Morphological events summary observed during the early development of Markiana nigripinnis.
FIGURE 4 in Early ontogeny of tetra Markiana nigripinnis (Characiformes: Characidae)
FIGURE 4 | Morphometric relationships (mm) between A. Head length and head depth, B. Head length and eye diameter, C. Head length and snout length during the early development of Markiana nigripinnis.
FIGURE 4 in Morphological study of the digestive tract of the cardinal tetra, Paracheirodon axelrodi (Characiformes: Characidae)
FIGURE 4 | Scanning Electron Microscopy (SEM) microphotographs of the digestive tract of Paracheirodon axelrodi. A-B. SEM view of mucosal surface showing a polyhedral surface of the epithelial cells in two different sections of the stomach. C. SEM view of mucosal surface of the intestine showing the brush border (Bb) present in the apical portion of the epithelium and abundant mucous secretion (red asterisk) from the GCs. D. Detail with higher magnification of C, in which the Bb is better defined.
FIGURE 3 in Morphological study of the digestive tract of the cardinal tetra, Paracheirodon axelrodi (Characiformes: Characidae)
FIGURE 3 | Histological sections of the digestive tract of Paracheirodon axelrodi, stained with Masson Trichrome (MT) (A,B,F,G), Periodic AcidSchiff (PAS) (C) and Alcian Blue (AB) (D,E). A. Cross section of the pyloric portion of the stomach, showing the CE mucosa and a layer of loose connective tissue (asterisk) under the epithelium. Note the absence of GG and a great development of the inner circular layer of SM. B. Cross section of a pyloric cecum, showing mucosal CE cells arranged in a brush border fashion and with numerous folds, and a thin layer of SM. Part of the pyloric stomach can be seen in the upper right corner. A portion of the pancreas (P) can be seen in the upper and lower corners. C. Cross section of intestine showing the PAS positive goblet cells (GCs) (arrowheads) with cytoplasm filled with glycoconjugates. The PAS reaction for neutral glycoconjugates produces an intense purple stain in the mucous granules of GCs and emphasizes the brush border of the enterocytes (arrow). D-E. Pyloric cecum (D) and intestine (E) showing AB positive GCs, with a similar distribution pattern in the epithelium. Thanks to the AB technique for acid mucosubstances, GCs show a strong positive blue staining. F. Pancreas section. The exocrine pancreas is formed by acini (segmented line), which are made up of a group of pyramidal-shaped secretory cells, called acinar cells. Towards the central part of the acinus, a small afferent vein is observed (white arrow). A prominent feature of acinar cells is the presence in their apical regions of aggregated bright eosinophilic zymogen granules (asterisk) that face the narrow lumen. The endocrine pancreas is formed by the Islets of Langerhans (IsL) composed of small cells with a pale-stained granular cytoplasm, in contrast to the larger acinar cells of the exocrine gland, which stain more strongly. On the left is a pancreatic duct (black star) with simple cuboidal epithelium. G. Liver (L) and pancreas (P) section. Many fish livers contain diffuse exocrine pancreatic tissue and are therefore called hepatopancreas. The liver showed polyhedral hepatocytes (asteriks) with a granular and poorly stained cytoplasm, the nuclei are spherical and centrally located presenting well delineated nucleoli. On the left is the smooth muscle layer (SM) of a portion of the intestine. CE, simple columnar epithelium; GCs, goblet cells; GG, gastric glands; SM, smooth muscle.
FIGURE 2 in Morphological study of the digestive tract of the cardinal tetra, Paracheirodon axelrodi (Characiformes: Characidae)
FIGURE 2 | Histological sections of the digestive tract of Paracheirodon axelrodi, stained with Masson Trichrome. A. Longitudinal section of pharynx, showing a mucosa with a stratified squamous epithelium (SS) and underneath this, a layer of loose connective tissue and a thin inner circular layer and an outer longitudinal layer of striated muscle (StM). Pharyngeal teeth (arrows) and taste buds (arrowheads) were observed. B. Cross section of the esophageal mucosa with multiple foldings, composed by a pseudostratified epithelium (PE) and abundant mucous cells. A layer of loose connective tissue was observed, surrounded by a muscular tunica with an inner longitudinal and an external circular layer of StM. C. Detail of B showing pseudostratified epithelium (PE) with abundant mucous cells, a dense septum of connective tissue and external circular layer of StM. D. Transverse section of the first portion of the stomach. where a simple columnar epithelium (CE) formed by a layer of secreting mucus cells, short gastric glands (GG) and a circular layer of StM are observed. E. Transverse section of the fundic stomach which presents a simple columnar epithelium (CE) and long ramified gastric glands (GG) surrounded by a loose connective tissue. The muscular layer at this point contained two sublayers of smooth muscle (SM), a circular inner layer and an outer longitudinal layer. F. Detail of E showing GG composed by oxintopeptics cells (black arrow). G. Detail of E showing CE as a layer of secreting mucus cells. Asterisk, loose connective tissue; CE, simple columnar epithelium; GG, gastric glands; PE, pseudostratified epithelium; SM, smooth muscle; StM, striated muscle.
FIGURE 1 in Morphological study of the digestive tract of the cardinal tetra, Paracheirodon axelrodi (Characiformes: Characidae)
FIGURE 1 | Paracheirodon axelrodi, anatomical arrangement of the digestive tract. A. Left lateral view of the digestive tract under stereoscope showing pyloric caeca (Pc), stomach (St), intestine (i), hindgut (h). B. Schematic representation of the left lateral view of the digestive tract showing the curvatures of the intestine. The most anterior portion of the intestine presents the first dorso-lateral curve (1), from which the six pyloric caeca are observed. At the second curve (2), the intestine was followed by a posterior extension that lay over the stomach. From this point posteriorly, it developed in an anterodorsal direction, on the left side of the stomach. The intestine is followed by a third curve (3) in a posteroventral direction. a → p, antero-posterior axes.
FIGURE 5 in The emerald green tetra: a new restricted-range Hyphessobrycon (Characiformes: Characidae) from the upper rio Juruena, Chapada dos Parecis, Brazil
FIGURE 5 | Graph showing the adipose fin variation in characids. Note that not all polymorphisms are the same condition: some species have more specimens with developed adipose whereas other species have more specimens lacking that fin. Numbers in graphic are percentages of specimens bearing adipose fin (orange) or lacking adipose fin (blue). Further details in Tab. 2.
FIGURE 4 in The emerald green tetra: a new restricted-range Hyphessobrycon (Characiformes: Characidae) from the upper rio Juruena, Chapada dos Parecis, Brazil
FIGURE 4 | Lagoon at the rio Mutum headwater due to the construction of a road, tributary of rio Camararé, upper rio Juruena basin, rio Tapajós basin, Comodoro, Mato Grosso, Brazil.
FIGURE 3 in The emerald green tetra: a new restricted-range Hyphessobrycon (Characiformes: Characidae) from the upper rio Juruena, Chapada dos Parecis, Brazil
FIGURE 3 | Distribution of Hyphessobrycon comodoro in the upper rio Mutum, rio Juruena basin, Brazil. Red star (type locality), black dot (occurrence of other paratypes). Symbol can represent more than one collection event.
FIGURE 2 in The emerald green tetra: a new restricted-range Hyphessobrycon (Characiformes: Characidae) from the upper rio Juruena, Chapada dos Parecis, Brazil
FIGURE 2 | Live coloration of Hyphessobrycon comodoro, Brazil, Mato Grosso State, Municipality of Comodoro, rio Mutum, upper rio Juruena basin: A. Holotype, MZUSP 125904, 29.6 mm SL, male; B. Paratype, MZUSP 125215, 27.4 mm SL, male lacking adipose fin; C. Paratype, MZUSP 125215, 29.8 mm SL, female.
FIGURE 1 in The emerald green tetra: a new restricted-range Hyphessobrycon (Characiformes: Characidae) from the upper rio Juruena, Chapada dos Parecis, Brazil
FIGURE 1 | Hyphessobrycon comodoro, Brazil, Mato Grosso State, Municipality of Comodoro, rio Mutum, upper rio Juruena basin: A. Holotype, MZUSP 125904, 29.6 mm SL, male; B. Paratype, MZUSP 125215, 25.3 mm SL, female; C. Aquarium specimen, not measured or preserved.
FIGURE 1 in Phylogenetic relationships of the neon tetras Paracheirodon spp. (Characiformes: Characidae: Stethaprioninae), including comments on Petitella georgiae and Hemigrammus bleheri
FIGURE 1 | Maximum Likelihood phylogenetic reconstruction of Stethaprioninae sensu Mirande (2018) using 16S ribosomal RNA and cytochrome C oxidase subunit I concatenated dataset after inclusion of Paracheirodon simulans and Petitella georgiae. Bootstrap values (≥ 75%) are shown near the nodes. Neon tetras are highlighted in red, and rummy-nose tetras are highlighted in blue.
Figure 8 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 8. Transitional and adult dentitions in Astyanax mexicanus. A, live fish – 65 days post-fertilization (dpf) (16.9 mm total length (TL)) showing premaxilla, with the first multicuspid teeth developing prior to replacing conical predecessors. Scale bar = 100 µm. B, cleared-and-stained fish – 163 dpf (41.8 mm TL). Asterisk indicates maxillary tooth. Scale bar = 1 mm.
Figure 5 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 5. Frequency distributions of tooth heights. Arrows indicate peaks corresponding to tooth replacement events, and to the plateaux in Fig. 3. A, only the single tallest tooth from each dentigerous bone. B, all measured teeth.
Figure 3 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 3. Sections through first (A, one month) and second (B, two months) generation oral teeth in Astyanax mexicanus. Scale bars = 50 µm.
Figure 11 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 11. Differences between successive tooth generations in terms of time (A), increase in fish total length (TL) (B) and increase in tooth height (C).
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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