A new Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio Araguaia basin, Brazil, with comments about Corydoras araguaiaensis Sands, 1990

Pupo

et al. 2018

A new species of the armoured catfish genus Corydoras is described from the Xingu-Tapajos ecoregion, Brazilian Amazon. The new species can be distinguished from its congeners by having the following combination of features: short mesethmoid, with anterior tip poorly developed, smaller than 50% of bone length; posterior margin of pectoral spine with serrations directed towards spine tip or perpendicularly oriented; infraorbital 2 only in contact with sphenotic; ventral laminar expansion of infraorbital 1 poorly or moderately developed; flank midline covered by small dark brown or black saddles with similar size to remaining markings on body; relatively larger, scarcer and more sparsely distributed dark brown or black spots on body; absence of stripe on flank midline; caudal fin with conspicuous dark brown or black spots along its entire surface; slender body; and strongly narrow frontals. A more comprehensive description of poorly-explored internal character sources, such as the gross morphology of the brain, Weberian apparatus and swimbladder capsule elements is presented.

Section: Discussionmentioning

confidence: 91%

Section: Additional Specimens Examinedmentioning

confidence: 99%

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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)

Espíndola

Pupo

et al. 2018

“…Among species with homoplastic colour patterns, the snout shape is one of the most important features for distinguishing otherwise cryptic taxa (Alexandrou et al, ). However, other morphological traits can also be effective for distinguishing these species, such as the serration pattern on the posterior margin of the pectoral spine and the size of laminar expansions of the infraorbitals (Tencatt et al, ; Tencatt & Britto, ; Tencatt & Ohara, , ; Tencatt & Pavanelli, ). These characteristics explain, for example, how C. gracilis and C. urucu belong to different groups of species despite both having a similar colour pattern and a short, rounded snout.…”

Section: Introductionmentioning

confidence: 99%

“…These characteristics explain, for example, how C. gracilis and C. urucu belong to different groups of species despite both having a similar colour pattern and a short, rounded snout. In another example, Corydoras eversi Tencatt & Britto shares a similar colour pattern and snout morphology with Corydoras araguaiaensis Sands 1990 but can be distinguished from that species by having conspicuously different osteological features of the head, even though both taxa possibly belong to the same lineage.…”

Section: Introductionmentioning

confidence: 99%

Deconstructing an octogenarian misconception reveals the true Corydoras arcuatus Elwin 1938 (Siluriformes: Callichthyidae) and a new Corydoras species from the Amazon basin

Lima

Britto

2019

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.

Corydoras fulleri (Siluriformes: Callichthyidae), a new catfish species from the rio Madeira basin, Peru

Santos

Evers³

et al. 2021

Self Cite

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.