From the inside out: a new species of armoured catfish <i>Corydoras</i> with the description of poorly‐explored character sources (Teleostei, Siluriformes, Callichthyidae)

Espíndola, Vinicius C.; Tencatt, Luiz Fernando Caserta; Pupo, F M; Villa-Verde, Leandro; Britto, Marcelo R.

doi:10.1111/jfb.13602

Cited by 6 publications

(2 citation statements)

References 33 publications

(47 reference statements)

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“…The olfactory bulb is sessile in G . sveni , as found in African cichlids (Huber et al ., 1997; Kotrschal et al ., 1998; van Staaden et al ., 1995), in Callichthyidae (Espíndola et al ., 2018; Pupo & Britto, 2018) and in a Characidae species (Abrahão et al ., 2019). Conversely, this feature may be stalked, as found in some Ostariophysi groups.…”

Section: Discussionmentioning

confidence: 99%

“…Regarding this, Kotrschal et al (1998) found the highest variability, but interspecific, in the forebrain (i.e., the portion of the encephalon composed of the telencephalon and the diencephalon) among African cichlids. The olfactory bulb is sessile in G. sveni, as found in African cichlids (Huber et al, 1997;Kotrschal et al, 1998;van Staaden et al, 1995), in Callichthyidae (Espíndola et al, 2018; and in a Characidae species (Abrahão et al, 2019). Conversely, this feature may be stalked, as found in some…”

Section: Width Of the Brainmentioning

confidence: 93%

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Encephalon gross morphology of the cichlid Geophagus sveni (Cichlidae: Geophagini): Comparative description and ecological perspectives

Oliveira

Graça

2020

Journal of Fish Biology

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The encephalon gross morphology of Geophagus sveni is described, compared between male and female specimens and discussed in relation to evolutionary, ecological and behavioural aspects. The Student's t-test revealed that there are no sexual dimorphism regarding the volume or linear measurements obtained from the main encephalon subdivisions (telencephalon, tectum mesencephali, cerebellum, gustative lobes, hypothalamus and hypophysis) in proportion to encephalon length, which is congruent with the absence of external dimorphic characters and presence of biparental care behaviour. In all specimens examined, the tectum mesencephali is the largest structure of the encephalon, which may be explained by feeding habit and by the importance of the vision center in a social context (i.e., brood guarding and territory defence, which are common behaviours in cichlids). Also, the lobus vagi is more developed than usual for other teleosts, which may be explained by the presence, in G. sveni as well as in other Geophagini species, of a differentiated pharyngeal apparatus, probably an adaptation to winnowing, a specialized feeding habit. The little intraspecific variation in neuroanatomical characters observed herein indicates a possible source of morphological characters to be explored in cichlid phylogeny.

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Section: Discussionmentioning

confidence: 99%

Section: Width Of the Brainmentioning

confidence: 93%

Encephalon gross morphology of the cichlid Geophagus sveni (Cichlidae: Geophagini): Comparative description and ecological perspectives

Oliveira

Graça

2020

Journal of Fish Biology

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Gross morphology of the brain and some sense organs of subterranean pencil catfishes of the genus ItuglanisCosta and Bockmann, 1993 (Siluriformes, Trichomycteridae), with a discussion on sensory compensation versus preadaptation in subterranean fishes

Rizzato,

Bichuette

2024

Journal of Fish Biology

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Subterranean organisms provide excellent opportunities to investigate morphological evolution, especially of sensory organs and structures and their processing areas in the central nervous system. We describe the gross morphology of the brain and some cephalic sensory organs (olfactory organ, eye, semicircular canals of the inner ear) and the swim bladder (a non‐sensory accessory structure) of subterranean species of pencil catfishes of the genus Ituglanis Costa and Bockmann, 1993 (Siluriformes, Trichomycteridae) and compare them with an epigean species of the genus, Ituglanis goya Datovo, Aquino and Langeani, 2016. We compared qualitatively the size of the different brain regions and sense organs of the subterranean species with those of the epigean one, searching for modifications possibly associated with living in the subterranean environment. Our findings suggest that species of Ituglanis exhibit sensory characteristics that are preadaptive for the subterranean life, as only slight modifications were observed in the brains and sense organs of the subterranean species of the genus when compared with the epigean one. Because most subterranean fish species belong to lineages putatively preadapted for subterranean life, our results, discussed in the context of available information on the brain and sense organs of other subterranean species, help identify general trends for the evolution of the brain and sensory organs of subterranean fishes in general.

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Redescription of Corydoras undulatus Regan, 1912 (Siluriformes: Callichthyidae), with comments on the identity of Corydoras latus Pearson, 1924

et al. 2019

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A redescription of Corydoras undulatus Regan, 1912 is presented. The original description of C. undulatus is very succinct, as is its diagnosis, which is based only on external morphology. Additional information in the scientific literature on this species is scarce. Specimens from the distribution area of this species were analyzed; Paraná and Paraguay river basins in Argentina, Uruguay river basin in Argentina, Brazil and Uruguay, and the Laguna dos Patos system in Brazil. Morphological analysis, principal component analysis (PCA), meristic comparison and osteological description were performed. Corydoras undulatus can be distinguished from its congeners mainly by having the following combination of characters: mesethmoid short, with anterior tip short, smaller than 50% of the entire bone length; posterior margin of the pectoral-fin spine with nearly all serrations directed towards origin of spine; pectoral-fin spine with conical serrations; and its peculiar color pattern. The analysis of the material from the different basins did not indicate relevant morphological differences, suggesting that the species presents a wide distribution in La Plata and Laguna dos Patos drainages. The shared geographic distribution between these two systems is also present in other fish species. The current work presents data about the type locality, taxonomy, osteology, distribution and ontogenetic variation of color pattern in C. undulatus. Comments on the identity of a very similar congener, Corydoras latus, will also be provided.

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From the inside out: a new species of armoured catfish Corydoras with the description of poorly‐explored character sources (Teleostei, Siluriformes, Callichthyidae)

Cited by 6 publications

References 33 publications

Encephalon gross morphology of the cichlid Geophagus sveni (Cichlidae: Geophagini): Comparative description and ecological perspectives

Encephalon gross morphology of the cichlid Geophagus sveni (Cichlidae: Geophagini): Comparative description and ecological perspectives

Gross morphology of the brain and some sense organs of subterranean pencil catfishes of the genus ItuglanisCosta and Bockmann, 1993 (Siluriformes, Trichomycteridae), with a discussion on sensory compensation versus preadaptation in subterranean fishes

Redescription of Corydoras undulatus Regan, 1912 (Siluriformes: Callichthyidae), with comments on the identity of Corydoras latus Pearson, 1924

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