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12 results for “Aequidens”
Fig. 33. a. Aequidens plagiozonatus, NUP 16948, 56.8 in Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated
Fig. 33. a. Aequidens plagiozonatus, NUP 16948, 56.8 mm SL, lagoa sem nome, tributary of rio Baía, Taquarussu, State of Mato Grosso do Sul. b. Apistogramma commbrae, NUP 6525, 32.5 mm SL, rio Paraná, Porto Rico, State of Paraná. c. Astronotus crassipinnis, 172.3 mm SL, fresh specimen, uncat. d. Chaetobranchopsis australis, NUP 9366, 95.2 mm SL, córrego Juqueri, tributary of the rio Guiraí, Novo Horizonte do Sul, State of Mato Grosso do Sul. e. Cichla kelberi, 190.0 mm SL, fresh specimen, uncat. f. Cichla piquiti, 240.0 mm SL, fresh specimen, uncat.
FIGURE 7 in A new species of Aequidens (Cichliformes: Cichlidae) from the rio Paraguai basin, Brazil
FIGURE 7 | Collecting sites of Aequidens pirilampo, showing (A) the ribeirão Comprido, its typelocality, (B) a stream with unknown name, and (C) the córrego de Cima, all tributaries of the rio Correntes in the border region of Mato Grosso and Mato Grosso do Sul states, Central Brazil. Photo (A) by LFCT, (B) by Heriberto Gimênes Jr., and (C) by Hans Evers.
FIGURE 9 in A new species of Aequidens (Cichliformes: Cichlidae) from the rio Paraguai basin, Brazil
FIGURE 9 | Maximum-likelihood tree based on the cytochrome oxidase c subunit I gene (COI) partial sequence and the species delimitation analyses evidencing the Aequidens pirilampo, clade (rio Paraguai basin) and the presence of A. plagiozonatus in the rio Paraguai (rios Taquari and Itiquira), and rio Araguaia basin (rio Boiadeiro). Morph.: morphological analysis. Notes labeled with numbers represent bootstrap support.
FIGURE 8 in A new species of Aequidens (Cichliformes: Cichlidae) from the rio Paraguai basin, Brazil
FIGURE 8 | General morphology and color pattern of Aequidens plagiozonatus of (A) an uncatalogued specimen captured in the Ponte de Pedra Reservoir, rio Correntes, rio Paraguai basin, a couple of days after preservation, and (B) an uncatalogued living specimen captured in the rio Boiadeiro/córrego Gordura, rio Araguaia basin, both specimens with about 70.0 mm SL. Photo (A) by LFCT and (B) by Hans Evers.
FIGURE 6 in A new species of Aequidens (Cichliformes: Cichlidae) from the rio Paraguai basin, Brazil
FIGURE 6 | Partial map of South America showing the distribution of Aequidens pirilampo, in the rio Paraguai basin (yellow shade), Brazil. Purple circle, type-locality in the córrego Comprido, rio Correntes basin; red diamonds, additional localities, rio Correntes basin; orange triangle, sinkhole; black star, locality of A. plagiozonatus in the rio Boiadeiro, rio Araguaia basin (red shade).
FIGURE 2 in A new species of Aequidens (Cichliformes: Cichlidae) from the rio Paraguai basin, Brazil
FIGURE 2 | Head profile (A) convex in Aequidens plagiozonatus, NUP 13372, 76.6 mm SL, horizontally inverted, and (B) triangular in A. pirilampo, NUP 23543, 94.7 mm SL holotype. Arrow indicates the groove between the eyes.
FIGURE 4 in A new species of Aequidens (Cichliformes: Cichlidae) from the rio Paraguai basin, Brazil
FIGURE 4 | Coloration and ontogenetic variation in Aequidens pirilampo, NUP 23544, (A) 87.2 mm SL, (B) 65.7 mm SL, (C) 24.6 mm SL, (D) 22.8 mm SL, (E) 22.5 mm SL, and (F) 14.6 mm SL, collected with holotype. Bar 9 includes the infraorbital bar in smaller specimens (C-F).
FIGURE 1 in A new species of Aequidens (Cichliformes: Cichlidae) from the rio Paraguai basin, Brazil
FIGURE 1 | Aequidens pirilampo, NUP 23543, 94.7 mm SL, holotype, Brazil, State of Mato Grosso, municipality of Itiquira, Comprido Creek, tributary of Correntes River, rio Paraguai basin.
FIGURE 5 in A new species of Aequidens (Cichliformes: Cichlidae) from the rio Paraguai basin, Brazil
FIGURE 5 | Ceratobranchials 5 (lower pharyngeal jaw) of Aequidens pirilampo, NUP 23547, paratype, 59.2 mm SL, in the occlusal plane, with anterior portion upwards.
FIGURE 3 in A new species of Aequidens (Cichliformes: Cichlidae) from the rio Paraguai basin, Brazil
FIGURE 3 | Aequidens pirilampo, living specimens photographed just after capture in the rio Comprido, rio Paraguai River basin, 17°32'04.8"S 54°25'36.6"W, uncatalogued. Photos by L. F. C. Tencatt.
Data from: Population connectivity and phylogeography of a coastal fish, Atractoscion aequidens (Sciaenidae), across the Benguela Current region: evidence of an ancient vicariant event.
Contemporary patterns of genetic diversity and population connectivity within species can be influenced by both historical and contemporary barriers to gene flow. In the marine environment, present day oceanographic features such as currents, fronts and upwelling systems can influence dispersal of eggs/larvae and/juveniles/adults, shaping population substructuring. The Benguela Current system in the southeastern Atlantic is one of the oldest upwelling systems in the world, and provides a unique opportunity to investigate the relative influence of contemporary and historical mechanisms shaping the evolutionary history of warm-temperate fish species. Using the genetic variation in the mitochondrial DNA Control Region and eight nuclear microsatellite DNA loci, we identified the presence of two highly divergent populations in a vagile and warm-temperate fish species, Atractoscion aequidens, across the Benguela region. The geographical distributions of the two populations, on either side of the perennial upwelling cell, suggest a strong correlation between the oceanographic features of the system and the breakdown of gene flow within this species. Genetic divergence (mtDNA φST = 0.902, microsatellite FST = 0.055: probability of genetic homogeneity for either marker = p<0.001), absence of migrants (less than 1% per generation) between populations and coalescent estimates of time since most recent common ancestor suggest that the establishment of the main oceanographic features of the system (2 million years ago), particularly the strengthening and position of the perennial upwelling cell, is the most likely mechanism behind the observed isolation. Concordance between mitochondrial and nuclear genetic markers indicates that isolation and divergence of the northern and southern Benguela populations of A. aequidens occurred deep in the past and has continued to the present day. These findings suggest that the Benguela Current system may constitute an ancient and impermeable barrier to gene flow for warm-temperate fish species.
Data from: Population connectivity and phylogeography of a coastal fish, Atractoscion aequidens (Sciaenidae), across the Benguela Current region: evidence of an ancient vicariant event.
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