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A. Corydoras bethanae, holotype alive, MUSM 69403, female, 51.2 mm SL, Peru, Department of Loreto, río Blanco. B. Corydoras arcuatus unpreserved aquarium specimen. C. Corydoras granti unpreserved aquarium specimen from Peru, río Tapiche. Photos A and C by Steven Grant, B by Hans-Georg Evers.
Source publication
A new Corydoras is described from the Blanco and Ucayali river basins in Peru. The new species can be distinguished from its congeners by having the following features: (I) posterior margin of dorsal-fin spine with laminar serrations directed towards the origin of the spine; (II) a long, wide, arched, and continuous black stripe, which runs paralle...
Contexts in source publication
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... of such serration pattern); from the species within lineage 8, except for C. arcuatus, it differs by the presence of a long, wide, arched, and continuous black stripe, which runs parallel to the dorsal profile of the body, extending at least from the region below anterior origin of dorsal fin to the anterior half of the ventral caudal-fin lobe ( Fig. 2A) (vs. absence of a similar stripe in remaining lineage 8 congeners); from C. arcuatus (Fig. 2B) differs by the color pattern of the head (presence of a black stripe transversally crossing the eye, forming the typical mask-like blotch; mask clearly not fused to arched stripe in most specimens; some specimens with mask separated from ...
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... by the presence of a long, wide, arched, and continuous black stripe, which runs parallel to the dorsal profile of the body, extending at least from the region below anterior origin of dorsal fin to the anterior half of the ventral caudal-fin lobe ( Fig. 2A) (vs. absence of a similar stripe in remaining lineage 8 congeners); from C. arcuatus (Fig. 2B) differs by the color pattern of the head (presence of a black stripe transversally crossing the eye, forming the typical mask-like blotch; mask clearly not fused to arched stripe in most specimens; some specimens with mask separated from arched stripe by a thin line around the suture between neurocranium (on the region composed by the ...
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... from C. gracilis and C. urucu Britto, wosiacki & Montag, 2009 by having pointed snout, presenting a long mesethmoid, with anterior tip larger than 50% of the entire length of the bone (vs. rounded snout, presenting a short mesethmoid, with anterior tip smaller than 50% of the entire bone length); from C. granti Tencatt, Lima & Britto, 2019 (Fig. 2C) by having ventral surface of trunk covered by small, non-coalescent platelets (vs. ventral surface of trunk entirely or partially covered by relatively large and coalescent ...
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... area on middle portion of dorsolateral surface of cleithrum corresponds with axillary gland sensu Kiehl et al. (2006) underneath; holotype similarly colored area on the ventral margin of the base of the adipose-fin spine. Figs 2A, and 6 of the holotype and two paratypes, respectively, whilst alive for color in life. Overall color same as in alcohol; third dorsolateral body scute usually whitish; green or gold to copper hue on lateral scutes above and below midline, opercular area, cleithrum, and underneath and behind the eye; snout area anterior to dark eye mask is usually light grey. ...
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... 2009;Tencatt et al., 2013Tencatt et al., , 2019Tencatt & Pavanelli, 2015;Tencatt & Britto, 2016;Tencatt & Ohara, 2016a,b;Lima & Sazima, 2017). Corydoras bethanae shares the same general color pattern of a light body with a black arched body band (but differs as set out in the Diagnosis) with some congeners, specifically C. arcuatus (lineage 8) (Fig. 2B), C. narcissus (lineage 1), C. granti (lineage 9) (Fig. 2C), and C. urucu (lineage 6 or 9). Additionally, there are other potentially undescribed coded species that share a similar color pattern to C. bethanae: C138 (lineage 8) which is said to be sympatric with C. bethanae (L. Enrique and J. Garcia, pers. comm.), C052 (lineage 8), ...
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... Pavanelli, 2015;Tencatt & Britto, 2016;Tencatt & Ohara, 2016a,b;Lima & Sazima, 2017). Corydoras bethanae shares the same general color pattern of a light body with a black arched body band (but differs as set out in the Diagnosis) with some congeners, specifically C. arcuatus (lineage 8) (Fig. 2B), C. narcissus (lineage 1), C. granti (lineage 9) (Fig. 2C), and C. urucu (lineage 6 or 9). Additionally, there are other potentially undescribed coded species that share a similar color pattern to C. bethanae: C138 (lineage 8) which is said to be sympatric with C. bethanae (L. Enrique and J. Garcia, pers. comm.), C052 (lineage 8), Cw072 (lineage 8), Cw073 (lineage 1) which is said to be ...
Citations
... Although our molecular results identified the nine lineages proposed by Alexandrou et al. (2011), we observed that lineages 4 and 5 were grouped together, as were lineages 6 and 9. Thus, a new division of the Corydoradinae into seven genera is proposed (Fig. 1), in the light of the phylogenetic analysis conducted herein and other cited studies plus the morphological data raised in previous studies (e.g. Britto 2003, Tencatt and Pavanelli 2015, Tencatt and Evers 2016, Tencatt and Ohara 2016a, b, Espíndola et al. 2018, Bono et al. 2019, 2020, 2022a,b, 2023, Bentley et al. 2021. Generic names are already available in the literature, as follows: Corydoras (lineage 1), Aspidoras (lineage 2), Scleromystax (lineage 3), Gastrodermus (lineages 4 and 5), Osteogaster (lineage 7), Brochis (lineage 8), and Hoplisoma (lineages 6 and 9). ...
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.
A new species of Corydoras is described from the rio Jutaí, Amazon basin, Brazil. The new species can be distinguished from its congeners by having the following features: (I) ventral surface of trunk entirely or almost entirely covered by small- to relatively large-sized coalescent platelets, forming a typical mosaic-like pattern; (II) large, arched dark brown or black patch extending from interopercle region to posterior process of parieto-supraoccipital, transversally crossing the orbit and forming a typical mask-like blotch; (III) absence of conspicuous dark markings on caudal fin; (IV) absence of longitudinal rows of dark blotches on flanks; (V) region of first dorsolateral body plate surrounding posterior process of parieto-supraoccipital clearly lighter than remaining portions of head, forming a V-shaped pattern in dorsal view; (VI) anterior portion of dorsal fin with a conspicuous dark patch; and (VII) anterior portion of dorsal-fin base with conspicuous concentration of dark brown or black chromatophores, forming a dark patch slightly darker than ground color of body. A discussion on the possible positive adaptive value of the color pattern is also provided.
An expedition crowdfunded by aquarists to a region of the Brazilian state of Pará drained by the Tapajós and Xingu river basins resulted in the capture of five species of Corydoras from the rio Jamanxim basin, a tributary to the rio Tapajós, of which three could be confirmed as new and described herein. The new species can be promptly diagnosed from their congeners by the combination of features related to color pattern and osteology. Considering the gathered information on color patterns and morphology plus field observations, the new species are considered to compose two distinct Müllerian mimicry rings, with two of them forming a mimetic pair, while the third one forms a pair with a fourth non-identified species captured in the same expedition. An identification key to the species of Corydoras from the rio Tapajós basin is also provided.
