João Paulo Capretz Batista Da Silva- PhD
- Professor at Federal University of Paraíba
João Paulo Capretz Batista Da Silva
- PhD
- Professor at Federal University of Paraíba
About
72
Publications
32,055
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430
Citations
Introduction
My main line of research involves the evolution of the appendicular skeleton in fishes through a macroevolutionary perspective based on the comparative anatomy of the paired fins. My areas of expertise encompasses Comparative anatomy, Systematics and Phylogeny of fishes, with emphasis in Chondrichthyes and Elopomorpha.
Current institution
Additional affiliations
July 2010 - December 2014
October 2011 - October 2011
Position
- PhD Student
Description
- "Métodos de campo para ictiofauna" como parte da disciplina do ciclo avançado da graduação em Ciências Biológicas do IBUSP, BIZ 0304 Diversidade, História Natural e Conservação de Vertebrados na América do Sul .
September 2004 - December 2006
Position
- Student
Description
- Taxonomic and morphological revision of Potamotrygon falkneri Castex & Maciel, 1963, (Chondrichthyes: Myliobatiformes: Potamotrygonidae)
Education
July 2010 - December 2014
August 2007 - January 2010
February 2002 - December 2006
Publications
Publications (72)
Elasmobranchs have been studied in anatomical terms for nearly 200 years, but several elements of their anatomy, such as the dorsal fin musculature, have not been completely addressed and still lack detailed descriptions. In this context, the present study investigates the anatomical variation of the muscles inclinatores dorsales across galeomorph...
The family Potamotrygonidae is part of the Neotropical ichthyofauna and has the largest diversity of freshwater elasmobranchs in the world. The neurocranium in Potamotrygonidae is an elongated and dorsoventrally flattened structure that articulates anterolaterally with the anterior portion of the propterygium, posteriorly with the sinarcual, and po...
Os tubarões e as raias são animais que têm sido gradativamente impactados pelas ações antrópicas. Uma das atividades que tem impactado grandemente esse grupo de peixes é a pesca indiscriminada, como consequência de uma fiscalização ambiental incipiente, da aplicação de nomes comuns a uma série de espécies distintas e o processamento de animais (e.g...
Leptocharias smithii has been poorly explored in anatomical terms. This species bears a mosaic of morphological characters and is considered to represent an intermediate condition between other carcharhiniform clades. In the present paper, the anatomy of the appendicular skeleton of the species is thoroughly investigated and compared with other rep...
The megatooth shark, †Otodus megalodon, which likely reached at least 15 m in
total length, is an iconic extinct shark represented primarily by its gigantic teeth in the
Neogene fossil record. As one of the largest marine carnivores to ever exist, under�standing the biology, evolution, and extinction of †O. megalodon is important because
it had a s...
The type specimens of the subclass Elasmobranchii deposited in the Museu de Zoologia da Universidade de São Paulo are compiled in an annotated list, including updated measurements, verified collection data and recent photographs of holotypes and selected paratypes. Relevant information on the preservation condition of the specimens and their curren...
Lamniform sharks are one of the more conspicuous groups of elasmobranchs, including several emblematic taxa as the white shark. Although their monophyly is well supported, the interrelationships of taxa within Lamniformes remains controversial because of the conflict among various previous molecular-based and morphology-based phylogenetic hypothese...
The morphology of paired fins is commonly overlooked in morphological studies, particularly the pelvic girdle and fins. Consequently, previous phylogenetic studies incorporating morphological data used few skeletal characters from this complex. In this paper, the phylogenetic significance of pelvic articular characters for elasmobranchs is discusse...
Oral denticles of sharks are composed by a crown, dentine covered by a layer of enameloid and pulp cavity, the same structure of the dermal denticles found across the body surface of most elasmobranchs. In addition, oral papillae and taste buds are distributed among denticles within the oropharyngeal cavity, playing a fundamental role for tasting a...
Oropharyngeal dermal denticles and oral papillae are present throughout the oropharyngeal cavity, and incorporate the use of taste buds to orally process and evaluate the food items, whereas oral denticles are thought to provide a form of protection against abrasion during food consumption and improve ventilation efficiency. Herein, are compared th...
The anatomy of Squalus acanthias has been explored and investigated for the past 150 years. Despite being a relatively well‐known species, some anatomical inaccuracies on the paired fins persist throughout the literature, such as the presence of suprascapular cartilages and the morphology of the articular region of the pectoral fin. This study reas...
The morphology of the articular region of the pectoral girdle and associated basals in Etmopteridae is revised in light of new evidence provided by taxa unavailable for previous studies. Such studies considered that etmopterids plesiomorphically had a single pectoral articular condyle, and only Etmopterus had two separate ones. Our reanalysis indic...
The rays of the order Myliobatiformes present several diagnostic characters, the most striking one being the presence of a serrated sting on the dorsal region of the tail. Although several morphological hypotheses have been proposed supporting the monophyly and interrelationships of its members, few characters of the appendicular skeleton were empl...
A new species of congrid eel, Bathycongrus villosus sp. nov., is described from the Philippines and Vanuatu. It is similar to some of the small-toothed species currently placed in Bathycongrus and to the species of Bassanago. In this paper we compare the new species to Bassanago albescens (Barnard, 1923) and to Bathycongrus parviporus Karmovskaya,...
We report deformities in the pelvic fin and clasper skeleton in specimens of Potamotrygon marquesi from Acre, Northwestern Brazil. The malformations involve skeletal deformities in the pelvic girdle, right clasper skeleton, and severe muscular and skeletal deformities in the left or right pelvic fin and clasper, including the loss of all of its ter...
Potamotrygon marquesi, sp. nov., is described and compared with other species of Potamotrygon occurring in the Amazon Basin. The identity of this new species is supported by an extensive external and internal morphological study including coloration pattern, squamation, skeleton and ventral lateral‐line canals. Morphometrics and meristics were used...
For instance, the pectoral skeletal elements are notoriously stouter in the clade Paratrygon + Heliotrygon but slender in the clade Potamotrygon + Plesiotrygon. This distinct morphology of the pectoral skeleton is reflected in the synarcual cartilage, an element of the axial skeleton that acts as an additional skeletal support for the pectoral gird...
A cladistic analysis of the eel families Derichthyidae and Colocongridae is herein proposed for the first time on the basis of morphological data. We discovered dozens of new phylogenetic characters derived from a detailed analysis of the pectoral skeleton, an anatomical system neglected by most previous studies. Our maximum parsimony analysis indi...
The morphology of the pectoral girdle and fin of Anguillidae is reconsidered via the inclusion of skeletal components that have previously been unassessed. For example, the pectoral girdle and fin in Anguilla has been erroneously reported to lack a scapular bone, a scapulocoracoid cartilaginous plate and a cartilaginous propterygium. The pectoral m...
The scapulae of elasmobranchs project dorsolaterally from their fusion with the coracoid bar of the pectoral girdle, serving as anchoring points for the cucullaris, trunk and appendicular muscles and as articular points for the pectoral-fin skeleton. The scapulae of many elasmobranch taxa are described, with an emphasis on variations in the posteri...
A new subfamily (Styracurinae, subfam. nov.) and genus (Styracura, gen. nov.) are erected for Trygon schmardae Werner, 1904 (type species) and Dasyatis pacificus Beebe & Tee-Van, 1941, species placed in Himantura Müller & Henle, 1837 since 1953 but which differ significantly from it and all dasyatid genera in many morphological features. Recent mol...
This study investigates the skeletal architecture of the anteroproximal surface of the anterior pectoral basals in squaliform sharks, which presents distinctions at the insertion of one of the components of the depressor pectoralis muscle. Some squalomorph and galeomorph sharks studied have a different orientation of the propterygium or anteroproxi...
The Neotropical freshwater stingray Potamotrygom orbignyi (Castelnau, 1855), and other similar "reticulated" species occurring in northern South American basins, were submitted to a thorough taxonomic analysis based on an extensive external and internal morphological study. The identity of P. orbignyi and the taxonomic status of the related nominal...
The morphology of the articular region of the scapulocoracoid and the basal cartilages of the pectoral fin endoskeleton of elasmobranchs is reviewed in detail. Examination of this specific morphology in more than 140 species of elasmobranchs (of which 40 are reported here) revealed characters that may have a bearing on the higher-level phylogeny of...
The morphology of the pectoral articular region in elasmobranchs was studied based on 154 species from 97 genera representing many orders and families. Particular attention
was given to characters employed in previous higher-level morphological phylogenetic studies. Two characters of the pectoral articulation previously described in these studies a...
Potamotrygon limai, sp. nov., is described from the Jamari River, upper Madeira River system (Amazon basin), state of Rondônia, Brazil. This new species differs from congeners by presenting unique polygonal or concentric patterns formed by small whitish spots better defined over the posterior disc and tail-base regions. Potamotrygon limai, sp. nov....
Nombre común y/o indígena Raya tigrita, raya pintada, raya común (Colombia, Venezuela); arraia (Brasil).
Nombre común y/o indígena Raya del Lago de Maracaibo (Venezuela); raya cuarterona (rayas grandes), raya tar-taguita (rayas pequeñas o neonatos) (Co-lombia).
We present morphological data addressing the higher-level relationships of elasmobranchs with the intention of exploring the current dichotomy between molecular and morphological elasmobranch phylogenies. Molecular data, from both nuclear and mitochondrial genes, resolves all sharks as a monophyletic group (i.e. without batoids); morphological data...
Potamotrygonid stingrays presently comprise four genera (Paratrygon, Potamotrygon, Plesiotrygon, Heliotrygon) and some 25 valid species, but some 10 new species are in the process of being described (principally in Potamotrygon). This elevated diversity is difficult to sort out, requiring large series of specimens and a broad geographic sampling. I...
Morphological data bearing on the higher-level relationships of major elasmobranch groups are revised, and new sources of morphological data affecting the placement of these groups are discussed. We bring to light evidence from comparative studies of the skeleton, mandibular and hyoid arch muscles, and afferent branchial vessels that support the pl...
Nombre común y/o indígena Arraia (Brasil); raya china (mercado acua-ró raya (Colombia). Estatus de conservación Categoría global IUCN: no evaluada. Caracteres distintivos Disco completamente circular, sin conca-vidad media en el margen anterior. Cola sin espinas o con una espina caudal ase-rrada muy reducida, mucho menor que el tamaño del espirácul...
Nombre común y/o indígena Raya "coly" (mercado acuaró arraia (Brasil). Estatus de conservación Categoría global IUCN: no evaluada. Caracteres distintivos Disco circular, con mayor amplitud justo en la parte anterior de la cintura pectoral, sin concavidad media en el margen ante-rior. Cola corta, su base con una espina aserrada reducida, con una lon...
Potamotrygon falkneri Castex y Maciel 1963 Nombre común y/o indígena Arraia (Brasil). en la mandíbula superior y 29 a 43 en la mandíbula inferior. En la 30 se muestra una foto de la especie viva (Figura 30a) y un ejemplar re-cién capturado en la Amazonia boliviana (Figura 30b). Talla y peso Se examinaron 10 individuos en total (3 H : 7 M), con tall...
Potamotrygon falkneri Castex y Maciel 1963 Nombre común y/o indígena Arraia (Brasil). en la mandíbula superior y 29 a 43 en la mandíbula inferior. En la 30 se muestra una foto de la especie viva (Figura 30a) y un ejemplar re-cién capturado en la Amazonia boliviana (Figura 30b). Talla y peso Se examinaron 10 individuos en total (3 H : 7 M), con tall...
Coloración general del dorso variable. Su-percie del disco y aletas pélvicas marrón oscuro o marrón claro, generalmente con un patrón reticular de pigmento oscuro, delimitando espacios circulares o hexa-gonales. Diámetro de la mayor forma re-ticular casi igual a la distancia entre los ojos. Dichos retículos o formas reticulares disminuyen en tamaño...
Nombre común y/o indígena Arraia (Brasil). Talla y peso Se examinaron siete individuos (1 H : 6 M), con tallas de 265 – 362 mm AD, pero sin datos de peso (Silva y Carvalho 2011) (Tabla 44). No hay datos de peso conocidos para esta especie. Distribución geográ País: Perú. Cuenca: Amazonas. Subcuenca: Potamotrygon tatianae es co-nocida únicamente del...
Dorso del disco, aletas pélvicas y cola oscu-ras, entre marrón y negro, con numerosas manchas grandes anaranjadas o marro-nes, algo borrosas. Una sola la de espinas regulares sobre la parte dorso-anterior de la cola. Cola pequeña. Ojos 1 a 5 veces más pequeños que los espiráculos. Surcos labiales presentes. Dientes pequeños, los centrales más robus...
A taxonomic revision of two nominal species of freshwater stingrays of the genus Potamotrygon previously considered valid, Potamotrygon falkneri Castex & Maciel, 1963 and Potamotrygon castexi Castello & Yagolkowski, 1969, was conducted based on a detailed analysis of external and internal morphology, including a morphometric and meristic study of s...
Potamotrygon tatianae sp. nov., is described from Río Madre de Díos, Peru, upper Rio Madeira basin. The new species is distinguished from all congeners by a unique combination of characters, including its dorsal color pattern formed by a relatively slender, highly convoluted, beige to dark brown vermicular pattern, a single row of dorsal tail spine...
The morphology and taxonomy of the Neotropical freshwater stingrays of the family Potamotrygonidae has been the subject of an ongoing review that has revealed an elevated diversity with many new species discovered. Complex and highly variable chromatic patters, associated with a conservative overall morphology, are some of the reasons why taxonomic...
The morphology and taxonomy of the Neotropical freshwater stingrays of the family Potamotrygonidae has been the subject of an ongoing review that has revealed an elevated diversity with many new species discovered. Complex and highly variable chromatic patters, associated with a conservative overall morphology, are some of the reasons why taxonomic...
Trabalho de Conclusão de Curso apresentado ao Departamento de Biologia da Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto da Universidade de São Paulo.
Questions
Question (1)
I am facing a nomenclatural problem and I need help. During my masters, I did a taxonomic review of two freshwater stingrays, P. orbignyi and P. dumerilii. As a conclusion of my work I proposed that they were synonyms. However, I did not know which name had precedence over the other since both were originally described in the same work by Catelnau in 1855. Consulting the ICZN (article 24) they proposed that this nomenclatural act should be resolved by the principle of the “First Reviser”. Carvalho et al. (2003) (in a checklist) proposed P. orbignyi as a senior synonym of P. dumerilii (acting as the “first reviser”) and as a consequence I gave precedence to the name P. orbignyi and included P. dumerilii as a junior synonym. However, P. dumerilii was described in a previous page (p. 101) to P. orbignyi (p. 102). In this case, does the P. dumerilii have precedence over the P. orbignyi since it was described in a page previous to it (nullifying the decision of the “First Reviser”), or should I accept the decision of the “first reviser”? None of the names has fallen in disuse and both have been used in the present literature, with some researchers still considering P. dumerilii as a valid species. How to proceed in this case?
