A revision of<i>Astyanax</i>(Characiformes: Characidae) in Central and North America, with the description of nine new species

Schmitter‐Soto, Juan J.

doi:10.1080/00222933.2017.1324050

Cited by 38 publications

(40 citation statements)

References 17 publications

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“…North to south: Lake Catemaco, in the Papaloapan basin Mexico; Lake Ocotalito and the Lacanjá river in the Usumacinta basin, Mexico; Lake Managua (also known as Xolotlán) in the San Juan basin Nicaragua and Lake Nicaragua (also known as Cocibolca) in the San Juan basin, Nicaragua (Table S1). These sympatric morphs correspond to different nominal species, four species originally assigned to the genus “ Bramocharax ”: “ B. caballeroi ” (Contreras‐Balderas & Rivera‐Teillery, ) from Lake Catemaco, Veracruz, México; Astyanax ocotal (considered “ Bramocharax ”‐like based on morphology; Schmitter‐Soto, ; Valdez‐Moreno, Contreras‐Balderas, & Contreras‐Balderas, ) from Lake Ocotalito, Chiapas, México; “ B. elongatus ” (Meek, ) a synonym of “ B. bransfordii ” (Gill & Bransford, ) from Lake Managua; and “ B. bransfordii ” from Lake Nicaragua and the Sarapiquí River San Juan System, Nicaragua, and Costa Rica. We also evaluated three sympatric species assigned to the genus Astyanax: A. aeneus (Günther, 1860) from Lake Catemaco and Lake Ocotalito ( sensu Ornelas‐García et al, ); A. nasutus (Meek, ) from Lake Managua; and A. nicaraguensis (Eigenmann & Ogle, ) from Lake Nicaragua and the Sarapiquí River.…”

Section: Methodsmentioning

confidence: 99%

“…Interestingly, a recent body shape and dentition analysis (Garita‐Alvarado et al, ) revealed that morphological differences between Astyanax and Bramocharax morphs vary across localities (i.e., geographically‐distinct lakes). Based on this genetic and morphological data (Ornelas‐García et al, ; Schmitter‐Soto, , ), it is likely that members of the Bramocharax morph are locally adapted morphs within lineages of Astyanax .…”

Section: Introductionmentioning

confidence: 92%

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A geographical cline in craniofacial morphology across populations of Mesoamerican lake‐dwelling fishes

et al. 2020

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Together, the complex geological history and climatic diversity of Mesoamerica create a rich source of biodiversity from which evolutionary processes can be studied. Here, we discuss highly divergent morphs of lake‐dwelling fishes distributed across Mexico and Central America, originally recognized as members of different genera (Astyanax and “Bramocharax”). Recent phylogenetic studies, however, suggest these morphs group within the same genus and readily hybridize. Despite genetic similarities, Bramocharax morphs exhibit stark differences in cranial shape and dentition. We investigated the evolution of several cranial traits that vary across morphs collected from four lakes in Mexico and Nicaragua and discovered an ecomorphological cline from northern to southern lakes. Northern populations of sympatric morphs exhibit a similar cranial shape and tooth morphology. Southern populations of Bramocharax morphs, however, showed a larger disparity in maxillary teeth, length and frequency of unicuspid teeth, an elongated snout, and a streamlined cranium compared to Astyanax morphs. This divergence of craniofacial morphology likely evolved in association with differences in trophic niches. We discuss the morphological differences across the four lake systems in terms of geological history and trophic dynamics. In summary, our study suggests that Bramocharax morphs are likely locally adapted members derived from independent Astyanax lineages, highlighting an interesting parallel evolutionary pattern within the Astyanax genus.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

A geographical cline in craniofacial morphology across populations of Mesoamerican lake‐dwelling fishes

et al. 2020

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Section: Introductionmentioning

confidence: 99%

“…Schmitter‐Soto (, ) reviewed the species of the genus occurring from the U.S.A. to Panama and listed a total of six species occurring south of Nicaragua, including three ( A. cocibolca , A. nasutus and A. panamensis ) of those listed by previous authors (see above) but omitting two of them [ A. kompi and A. orthodus ( sensu Bussing, , )]. In addition to these species, Schmitter‐Soto (, ), based on his own research and supported by molecular evidence published by Ornelas‐Garcia et al . (), proposed revalidating Astyanax nicaraguensis Eigenmann & Ogle, (Atlantic Ocean, from central Nicaragua to western Costa Rica) and Astyanax orstedii (Lütken 1875) (Pacific and Atlantic Ocean, from southern Nicaragua to western Panama), considered by previous authors as junior synonyms of A. aeneus ; synonymizing Bramocharax Gill 1877 with Astyanax , adding Astyanax bransfordii (Gill 1877) (from southern Nicaragua and north‐eastern Costa Rica) to the list of valid species of the genus; synonymizing A. ruberrimus with A. panamensis .…”

Section: Introductionmentioning

confidence: 99%

A new species ofAstyanax(Characiformes: Characidae) from Costa Rica and Panama, with a key to the lower Central American species of the genus

Angulo

Santos

López

et al. 2018

Journal of Fish Biology

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Astyanax anai, a new species of characid fish, is described from the Sixaola River basin, eastern Costa Rica-western Panama, Central America. The new species can be distinguished from all other congeners by the following combination of characters: premaxillary teeth 4-5 at the inner series and 4-6 at the outer series; maxillary teeth tricuspid, 2-4; predorsal scale series irregular and incomplete, with an unscaled space behind tip of supraoccipital process and 12-14 scales; lateral line scales 34-39; humeral region with a conspicuous black and rounded to horizontally ovate spot and two diffuse brown and vertically elongate bars (the first through the rounded to horizontally ovate spot, the second 2-4 scales behind the first); body depth 36·6-42·3% of standard length (L ); midlateral stripe formed by a series of 10-14 anteriorly-directed dermal herringbone, or chevron-shaped, marks, most apparent in juveniles and in preserved specimens, extending above the lateral line from the black humeral spot or just behind it (from the second vertical bar) to the caudal peduncle; scale rows from lateral line to base of first dorsal-fin ray 8-9; scale rows from lateral line to base of pelvic fin 7-8; pre-anal distance 53·9-61·9% of L ; total anal-fin elements 29-33; caudal spot elongated, rhomboid or rectangular, with its anterior margin surpassing the middle of the caudal peduncle, usually reaching the anal-fin insertion, posteriorly covering 4-7 principal caudal-fin rays and not extending onto the ventral and dorsal margins of the caudal peduncle, covering 3-5 horizontal scale rows. In order to test the phylogenetic relationships of the new taxon in relation to the other North and Central American species of the genus, a new phylogenetic hypothesis based on a reanalysis of the morphological matrix by Schmitter-Soto (2016) is proposed. A key to the lower Central American (southern Nicaragua to eastern Panama) species of Astyanax is also provided.

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“…Astyanax is one of the most diverse genera in the Characidae (Schmitter-Soto 2017). The genus is widely distributed in the Neotropics (Casciotta et al 2005) and does not form a monophyletic clade (Mirande 2010, Rossini et al 2016.…”

Section: Introductionmentioning

confidence: 99%

Expanding the geographical distribution of Astyanax biotae Castro & Vari, 2004 (Characiformes, Characidae), with comments on its conservation status

Oliveira¹,

Oliveira²,

Pavanelli³

2018

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Astyanax biotae Castro & Vari, 2004 was only known from the type locality, a first-order stream from the lower Paranapanema River, a left bank tributary from the upper Paraná river basin. We report A. biotae from the Ivinhema River, rio do Peixe and other tributaries of Paranapanema River, expanding its distribution to both margins of the Paraná River. Astyanax biotae is zooplanktivorous and regarding its conservation status, can be classified as Least Concern.

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A revision ofAstyanax(Characiformes: Characidae) in Central and North America, with the description of nine new species

Cited by 38 publications

References 17 publications

A geographical cline in craniofacial morphology across populations of Mesoamerican lake‐dwelling fishes

A geographical cline in craniofacial morphology across populations of Mesoamerican lake‐dwelling fishes

A new species ofAstyanax(Characiformes: Characidae) from Costa Rica and Panama, with a key to the lower Central American species of the genus

Expanding the geographical distribution of Astyanax biotae Castro & Vari, 2004 (Characiformes, Characidae), with comments on its conservation status

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A revision ofAstyanax(Characiformes: Characidae) in Central and North America, with the description of nine new species

Cited by 38 publications

References 17 publications

A geographical cline in craniofacial morphology across populations of Mesoamerican lake‐dwelling fishes

A geographical cline in craniofacial morphology across populations of Mesoamerican lake‐dwelling fishes

A new species ofAstyanax(Characiformes: Characidae) from Costa Rica and Panama, with a key to the lower Central American species of the genus

Expanding the geographical distribution of Astyanax biotae Castro &amp; Vari, 2004 (Characiformes, Characidae), with comments on its conservation status

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Expanding the geographical distribution of Astyanax biotae Castro & Vari, 2004 (Characiformes, Characidae), with comments on its conservation status