Review of the genus<i>Corydoras</i>from Peru and ecuador (Pisces, Siluriformes, Callichthyidae)

Nijssen, H.; Isbrücker, I.J.H.

doi:10.1080/01650528609360697

Cited by 42 publications

(64 citation statements)

References 6 publications

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“…The main difference in VeraAlcaraz's (2013) hypothesis is the position of the clade containing the species related to the "Corydoras elegansgroup" sensu Nijssen & Isbrücker (1980), which appears as sister group of a large clade formed by two smaller clades, one of them with Aspidoras Ihering, 1907 as the sister group of Scleromystax Günther, 1864, and both sister group of a large clade with the species attributed to Hoplisoma Swainson, 1838, which was proposed as valid. The species allocated in Hoplisoma by Vera-Alcaraz (2013) correspond to species of the lineages 6, 7, 8 and 9 sensu Alexandrou et al (2011).…”

Section: Discussionmentioning

confidence: 99%

“…Additionally to the presence of lanceolate genital papilla in males, which is common to all Corydoradinae (see Nijssen & Isbrücker, 1980;Britto, 2003), the males are generally smaller than females (Fig. 5b).…”

Section: Color In Alcoholmentioning

confidence: 99%

“…In the molecular phylogenetic hypothesis presented by Alexandrou et al (2011), some of the species of the "Corydoras elegans-group" sensu Nijssen & Isbrücker (1980) appeared in a larger monophyletic clade composed by two smaller clades assigned as lineages 4 and 5. Along with the species of the "Corydoras elegans-group", C. bilineatus Knaack, 2002, C. gracilis Nijssen & Isbrücker, 1976, C. napoensis Nijssen &Isbrücker, 1986 andC.…”

Section: Introductionmentioning

confidence: 99%

“…One of the more comprehensive studies regarding Corydoras species was presented by Nijssen (1970), in his revision of the Corydoras species from the Suriname. Additionally, the author proposed nine groups of species based mainly in color pattern and external morphology.…”

Section: Introductionmentioning

confidence: 99%

“…pygmaeus Knaack, 1966. Another group proposed by Nijssen (1970) was the "Corydoras elegans-group", hosting three species, C. elegans Steindachner, 1876, C. nanus Nijssen & Isbrücker, 1967, and C. pestai Holly, 1940. Ten years later, Nijssen & Isbrücker (1980) included the species of the "Corydoras hastatus-group" in the "Corydoras elegans-group" and additionally included C. guapore, C. latus Pearson, 1924, which was not hosted in any group in Nijssen's (1970) work, and C. undulatus Regan, 1912 in the group.…”

Section: Introductionmentioning

confidence: 99%

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Redescription of Corydoras guapore Knaack, 1961 (Siluriformes: Callichthyidae), a midwater Corydoradinae species from the rio Guaporé basin

2015

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Corydoras guapore was described from the rio Guaporé, Rondônia State, Brazil, based only in three specimens, two of them merely examined alive in an aquarium and apparently not preserved posteriorly. The current location of these two paratypes is uncertain. In the original description, no standard diagnosis was presented and the descriptive information available is scarce and based only in external morphology. Thus, the aim of this study is to provide a redescription of C. guapore based in several topotypes. Corydoras guapore can be distinguished from its congeners by the presence of a short mesethmoid, with the anterior tip poorly developed; posterior margin of pectoral spine with conical serrations directed towards the origin of the spine; and by the lateral portion of caudal peduncle almost entirely blackened. Information about C. guapore ecology and conservation status are also provided.Corydoras guapore foi descrita do rio Guaporé, estado de Rondônia, Brasil, com base em somente três exemplares, sendo dois deles apenas examinados vivos em um aquário e aparentemente não preservados posteriormente. A atual localização desses dois parátipos é incerta. Na descrição original, uma diagnose padrão não foi apresentada e as informações descritivas disponíveis são escassas e baseadas apenas em morfologia externa. Dessa forma, o objetivo desse estudo é fornecer uma redescrição de C. guapore baseada em vários topótipos. Corydoras guapore pode ser distinguida de suas congêneres pela presença de mesetmóide curto, com a extremidade anterior pouco desenvolvida, margem posterior do acúleo peitoral com serrilhas cônicas voltadas em direção à origem do acúleo, e pela porção lateral do pedúnculo caudal quase totalmente enegrecida. Informações sobre a ecologia e status de conservação de C. guapore também são fornecidas.

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Section: Discussionmentioning

confidence: 99%

Section: Color In Alcoholmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Redescription of Corydoras guapore Knaack, 1961 (Siluriformes: Callichthyidae), a midwater Corydoradinae species from the rio Guaporé basin

2015

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Early development and allometric growth in the armoured catfish Corydoras aeneus (Gill, 1858)

et al. 2009

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An ontogenetic series of in-captivity bred Corydoras aeneus was used, in order to study the developmental changes in the external morphology. Allometric growth of several body parts was studied, attempting to reveal important steps in the species' early life history. Based on the external morphology, the different stages during early development of C. aeneus were identified, according to Balon (Journal of the Fisheries Research Board of Canada 32: [1663][1664][1665][1666][1667][1668][1669][1670] 1975). After hatching, at a SL of 3.5 mm, the developmental state corresponded to an eleutherembryonic phase, followed by the protopterygiolarval phase (4.4-5.7 mm SL), the pterygiolarval phase (5.7-14.0 mm SL) and the juvenile period. In addition, an overall growth curve and inflexion points were determined. As such, ontogenetic changes in growth coefficients k (in SL = b age k ) were determined. Log transformed data were used for a piecewise linear regression method, as per regression spline smoothing procedures. This way, the growth curve could be divided into six different intervals of growth rate. Initially, the slope was 0.05 until 0.7 dph, then increasing to 0.18 until 4 dph, and 0.36 until 10 dph. After this, growth rate reached a maximum of 0.76 until 24 dph, slowed down to 0.47 until 37 dph and then finally again slowed down to 0.36. A similar growth analysis was also done on the different body parts and these results were compared to both morphological and data from literature. This led to the conclusion that the inflexion points found during the early development of C. aeneus matched the different key-events known in teleost early life history and development. The transition from endo-to exogenous feeding, at the moment a functional branchial respiratory system becomes increasingly important, was the first point at which allometries changed together with functional demands. A second, similar congruence occurred at the transition to the pterygiolarval phase, when priorities shift towards locomotory needs. Finally, our results also indicated a transition to a carangiform swimming mode at approximately 8 mm SL.

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Integrated analysis reveals a new species of Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) in the lower Iguassu River, Brazil

Rocha¹,

Fernandes

Bignotto

et al. 2021

Org Divers Evol

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Review of the genusCorydorasfrom Peru and ecuador (Pisces, Siluriformes, Callichthyidae)

Cited by 42 publications

References 6 publications

Redescription of Corydoras guapore Knaack, 1961 (Siluriformes: Callichthyidae), a midwater Corydoradinae species from the rio Guaporé basin

Redescription of Corydoras guapore Knaack, 1961 (Siluriformes: Callichthyidae), a midwater Corydoradinae species from the rio Guaporé basin

Early development and allometric growth in the armoured catfish Corydoras aeneus (Gill, 1858)

Integrated analysis reveals a new species of Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) in the lower Iguassu River, Brazil

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