FIGURE 4 - uploaded by Willian M. Ohara
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Ventral view of left pectoral-fin spine of Corydoras hephaestus, MZUSP 118570, 25.4 mm SL, showing the small conical serrations on inner margin of the right spine.
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A new species of Corydoras is described from the upper Rio Machado, Rio Madeira basin, Rondônia State, Brazil. The new species can be distinguished from its congeners by the absence of contact between the posterior process of the parietosupraoccipital and the nuchal plate; a ventral laminar expansion of the infraorbital 1 conspicuously developed; a...
Citations
... After that, numerous species within Corydoradinae have been described in subsequent studies (e.g. Britto et al. 2016, Ohara et al. 2016, 2022b, 2023a,b, 2024, contributing to our expanding knowledge of the diversity of the group. More recently, the genus Aspidoras was revised by Tencatt et al. (2022a), who recognized 18 valid species in the genus. ...
... ground colour of body pale yellow, brownish yellow, or greyish yellow, typically with small dark spots at least in some part of the body and/or more than one large, dark patch on body in most species of remaining genera). See Ohara et al. (2016) and Tencatt et al. (2023) for further information and illustrations on Osteogaster. ...
... The main morphological characteristics of the resurrected genus Osteogaster were provided by Ohara et al. (2016) and Tencatt et al. (2023), although the authors used the name Corydoras in their studies. Regardless of the absence of Corydoras eques (Steindachner, 1876), the type species, in our phylogenetic hypothesis, its close relationship to the remaining Osteogaster species was shown by Alexandrou et al. (2011). ...
The family Callichthyidae, which comprises the subfamilies Corydoradinae and Callichthyinae, represents one of the largest families within the Siluriformes. Corydoradinae, the largest subfamily of Callichthyidae, alone accounts for >200 valid species, with new species being described frequently. This subfamily holds significant popularity among catfish enthusiasts worldwide, mainly because Corydoras are small, peaceful, and colourful fishes. Recognizing the existence of polyphyletic groups within Corydoradinae, the aim of this study was to construct a new phylogenetic hypothesis using genomic data (ultraconserved elements) and to re-evaluate the synonymized genera using the most recent morphological data. Our results supported the monophyly of Corydoradinae and identified seven distinct groups of species, each one with an associated preavailable generic name. These genera, namely Corydoras, Aspidoras, Scleromystax, Gastrodermus (resurrected), Osteogaster (resurrected), Brochis (resurrected), and Hoplisoma (resurrected), were all validated based on evidence derived from molecular and morphological analyses. A taxonomic key for the Corydoradinae genera is provided.
... "T" indicates type-locality, each symbol may represent more than one lot or locality. Ohara, Tencatt & Britto, 2016) and Pyrrhulina sp. That tributary was categorized as a "terra-firme igarapé" (= highland creek), with its sampled stretch located at 585 m above sea level, described as being small, 1.5-2.5 m wide and 0.3-1.5 m deep, with clear and swift waters, and bottom composed of sand and dead leaves, with little preserved riparian vegetation and surrounded by large plantation fields (mostly soy and corn) (Ohara & Lima, 2015: fig. ...
Two new species of heptapterid catfish genus Cetopsorhamdia are described from close localities in western Brazil, at Chapada dos Parecis, an area with extremely high level of endemism. One species is from the upper Rio Madeira system, Rondônia State, and the other from the upper Rio Tapajós system, Mato Grosso State. The two species are diagnosed, among several other features, by their markedly distinctive color patterns, with the former having well-defined quadrangular marks in trunk flanks while the latter bearing irregular, vertical bars along the trunk. The monophyly of Cetopsorhamdia is discussed, with two putative synapomorphies being proposed to support the genus. Potentially informative morphological characters to resolve the internal relationships of the genus are presented and discussed. Despite the striking external differences between the two species herein described, they are found to likely form a clade.
... Despite the wide geographic distribution of Corydoras in cisandean South America, its representatives predominantly occur in the Amazon basin, in which more than the half of the known species can be found (Tencatt & Ohara, 2016b). The rio Madeira basin, which flows into the rio Amazonas, is the world's richest drainage regarding the number of fish species (Jézéquel et al., 2020;Torrente-Vilara et al., 2013), and currently harbours 44 species of Corydoras, representing one quarter of the total species of the genus (Ohara et al., 2016;Tencatt & Evers, 2016;Tencatt & Ohara, 2016a, 2016b. ...
A new long‐snouted Corydoras species is described from two tributaries of the río Manuripe and a tributary of the río Madre de Dios, rio Madeira basin, Peru. Corydoras fulleri can be distinguished from its congeners by having the following features: (a) branch of the temporal sensory canal at sphenotic, which gives rise to the supraorbital canal, with two pores; (b) upper tooth plate of branchial arch with three series of teeth; (c) area at the corner of the mouth, ventral to the maxillary barbel, with a small fleshy flap; (d) two moderate‐sized dark‐brown or black blotches on caudal‐fin base, one on its lateral portion and another one on its dorsal portion, blotches variably diffuse and/or fused with each other; (e) absence of a dark‐brown or black stripe transversally crossing the orbit; (f) a longitudinal dark‐brown or black stripe on the postdorsal region of flank midline, variably fused with the lateral peduncular blotch, some specimens with slender, longitudinally elongated, dark‐brown or black blotch on flank midline, forming a dash‐like marking, stripe or dash‐like blotch diffuse in some specimens; and (g) region around dorsal‐fin origin generally lacking dark brown or black blotch, or displaying diffuse blotch.
... Corydoras Bloch is currently the most species-rich genus within the order Siluriformes, with 174 valid species (Espíndola et al., 2018;Tencatt et al., 2019). Most taxonomic works on the genus were conducted during the 1970s and 1980s (e.g., Nijssen, 1970;Nijssen & Isbrücker, 1980, 1983, 1986, but a recent upsurge in species descriptions (e.g., Tencatt & Ohara, 2016a,b;Ohara et al., 2016;Lima & Sazima, 2017;Espíndola et al., 2018;Tencatt et al., 2019) shows that the taxonomic knowledge on the genus is still far from complete. The phylogenetic relationships within the genus were examined by Britto (2003), using morphological data, and Alexandrou et al. (2011), using molecular data, but similarly to the taxonomic knowledge, many questions still need to be addressed until relationships can be considered well understood. ...
A new Corydoras is described from the rio Juruena system, upper rio Tapajós drainage, Amazon basin, Brazil. The new Corydoras is distinguished from all congeners by presenting a combination of a conspicuous broad vertical dark bar on head, at the level of the eye (mask), an overall light background color without large blotches or stripes on body or fins, the presence of two to four small dark blotches along the midline, and pectoral spine with antrorse serrations on its posterior margin. Males of the new species possess numerous, well-developed odontodes over the lateral portions of head, pectoral girdle, and pectoral spines, an uncommon feature for the genus. The new species is hypothesized to belong, within the genus Corydoras, either to Lineage 6 or Lineage 9.
... The armored catfishes Callichthyidae can be promptly recognised among other Siluriformes by having two longitudinal series of dermal plates on flanks (Reis, 1998(Reis, , 2003). The family currently comprises more than 200 species grouped in eight genera, including Corydoras Lacépède 1803, which contains more than than 170 valid species, making it the most species-rich genus of Siluriformes ( Lima & Sazima, 2017;Ohara et al., 2016;Reis, 2003). Since the 1970s, comprehensive studies attempting to understand the taxonomy and phylogenetic relationships of the species of Corydoras have been made (Alexandrou et al., 2011;Britto, 2003;Nijssen, 1970;Nijssen & Isbrücker, 1980a, 1983, 1986, but the knowledge of the taxonomy and interrelationships within Corydoras is still precarious ( Britto et al., 2007). ...
After 80 years of misidentifications, the analysis of the holotype of Corydoras arcuatus plus several non‐type specimens attributed to this species allowed its recognition and also revealed a new species, both sharing the following diagnostic features: a long, arched, continuous black stripe that runs parallel to the dorsal profile of the body and extends at least from the anterior margin of the first dorsolateral body plate to the posterior portion of caudal peduncle; absence of transverse black bars on caudal fin; infraorbital 2 in contact with sphenotic and compound pterotic. In addition to these features, C. arcuatus can be distinguished from congeners by having the posterior margin of both dorsal and pectoral spines with laminar serrations directed towards their origins. The new species can be additionally distinguished from its congeners by presenting the following combination of features: ventral surface of trunk entirely or partially covered by relatively large and coalescent platelets; absence of spots or blotches on dorsal fin; and posterior margin of both dorsal and pectoral spines with serrations directed towards their tips. Finally, an identification key to all arc‐striped species of Corydoras is provided.
A new species of Corydoras is described from tributaries to the rio Araza, an affluent of the rio Inambari, itself a tributary to the rio Madre de Dios, rio Madeira basin in the Peruvian Amazon. The new species can be distinguished from its congeners by the following features: (I) absence of contact between the posterior process of the parieto-supraoccipital and the nuchal plate, (II) a single, large conspicuous dark brown or black blotch on anterodorsal portion of flank; blotch somewhat rounded to roughly diamond shaped, and (III) absence of dark blotches on fins. General comments on the identity of Corydoras aeneus are also provided.
Aspidoras comprises 25 species currently considered as valid, being widely distributed in Brazil, occurring from the upper rio Paraná basin in São Paulo to coastal basins of Ceará. After Nijssen, Isbrücker’s review more than 40 years ago, no extensive work regarding the taxonomy of Aspidoras was conducted. Our paper presents a comprehensive taxonomic revision of the genus, based primarily on the extensive material that has been collected since then. Considering the new diagnosis plus the available phylogenetic data, A. pauciradiatus and A. virgulatus are transferred to Corydoras and Scleromystax, respectively. New synonymies are proposed: A. eurycephalus and A. taurus with A. albater; A. menezesi and A.
spilotus with A. raimundi; and A. microgalaeus and A. marianae with A. poecilus. Additionally, a new species from the Araguaia and Paraguay river basins is described, which can be distinguished from its congeners by the morphology of its complex vertebra and infraorbital 1. Thereby, the number of valid species within Aspidoras was reduced from 25 to 18. Redescriptions for A. albater, A. belenos, A. depinnai, A. fuscoguttatus, A. lakoi, A. maculosus, A. poecilus, A. psammatides, A. raimundi, and A. velites are provided. An identification key to the species of Aspidoras is also provided.
This study represents an inventory of fish collected in a first order tributary of the Igarapé Piracolina at Chapada dos Parecis, upper Rio Machado drainage, Rio Madeira basin, Vilhena, Rondônia, Brazil. The sampled stream is located in moderate altitudes (570-590) m above sea level and it is the type locality of five recently described species. Through fieldwork carried out in four fieldtrips between 2014 and 2015, 966 specimens were captured belonging to 18 species, distributed in nine families and four orders. Most of these species have a restricted distribution in the upper Rio Machado. Characidae was the most representative family both in number of species and specimens. One species is recognized as new and endemic to the region, and belong to the genus Pyrrhulina (Lebiasinidae), while five other species (Ancistrus verecundus, Bryconops piracolina, Hyphessobrycon lucenorum, Moenkhausia cambacica, and M. parecis) are also possibly endemic to the upper Rio Machado basin. In this scenario, our results provide relevant data for the establishment of guiding policies, management decisions and bases for conservation actions in moderate altitude areas of the Amazon basin.
This study aims to provide an annotated list of the type-material housed in the fish collection of the Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (NUP), Universidade Estadual de Maringá, Paraná, Brazil. NUP’s fish type collection hosts type-material of 157 species, distributed in 503 lots (11 holotypes and 492 lots of paratypes) totalling 2,915 specimens. For each species, catalog numbers of all available lots are provided, and for each lot, total number of specimens, range of variation of standard length, number of cleared and stained specimens (when any), locality data, collectors, and date of collection, are provided.
A new species of the bluntnose knifefish genus Brachyhypopomus Mago-Leccia is described from headwaters of upper Rio Juruena, and upper Rio Machado, Amazon basin, Brazil. The new species differs from all congeners by the absence of a small independent ossification of the Weberian complex located posterodorsally to the supraoccipital. It can be additionally distinguished from its congeners by a set of characters in combination that includes: absence of accessory electric organ over the opercular region, absence of a prominent pale uninterrupted middorsal stripe on body, presence of scales on the entire middorsal region of body, dorsal rami of the recurrent branch of anterior lateral-line nerve not externally visible, presence of a dark suborbital stripe, and possession of 8–10 scale rows above the lateral line. The phylogenetic position of the new species is inferred by its inclusion in a total-evidence matrix with data from morphology, mitochondrial genes, and nuclear genes of all species. The new species is apparently restricted to upland tributaries of the Chapada dos Parecis, more than 500 m high. Comments on the occurrence of fish species in multiple independent basins at Chapada dos Parecis are also provided.
http://www.zoobank.org/urn:lsid:zoobank.org:pub:620C58EB-4DA7-4322-9E2D-ACF4152DB0C7
