Mariangeles Arce H.

• PhD
• Manager at Academy of Natural Sciences of Drexel University

Doradidae is a monophyletic catfish family endemic to continental South America, and composed of 93 valid species here placed in 31 genera. Existing phylogenetic hypotheses for Doradidae are derived from comprehensive analyses of morphological data, and a single molecular-based study on a limited subset of taxa. To provide a robust molecular phylog...

This paper reports the results of a comparative study of the mandibular, hyoid, and pectoral musculature of South American Doradidae. Sixty-one species of Doradidae were examined including representatives of all the genera. Twenty muscles are described including their ontogenetic origin, function, area of origin and insertion, and parts. Seven musc...

We performed the first combined-data phylogenetic analysis of ictalurids including most living and fossil species. We sampled 56 extant species and 16 fossil species representing outgroups, the seven living genera, and the extinct genus †Astephus long thought to be an ictalurid. In total, 209 morphological characters were curated and illustrated in...

Nemadoras cristinae is described from the upper Amazonas/Solimões and Madeira basins in Brazil, Colombia and Peru, with additional specimens from the upper Meta (Orinoco basin), Colombia, tentatively treated as conspecific. Nemadoras cristinae is distinguished from congeners by having 3–9 premaxillary teeth in approximately two rows in juveniles an...

Platydoras brachylecis, new species, is described from coastal drainages of northeastern Brazil (Pindare to Parnaiba rivers), and diagnosed from congeners by the unique combination of. pale yellow to white stripe beginning above orbits, continuing midlaterally on body and onto middle rays of caudal fin; skin in axil of each midlateral thorn without...

Se llevó a cabo un estudio sobre el bagre rayado Pseudoplatystoma magdaleniatum (Buitrago-Suárez & Burr, 2007) en la cuenca media del río Magdalena, específicamente en los municipios de Honda, La Dorada, Puerto Boyacá, Puerto Berrío y Barrancabermeja durante los meses de enero y febrero de 2004. La situación de esta especie en la cuenca es grave de...

Synbranchus (swamp eel) specimens exhibiting remarkable variation were collected from different habitats during recent fieldwork in the Xingu Basin, Brazil. For this study, those specimens were first sorted into about six morphotypes based on external morphology, especially color pattern. Representatives of each morphotype and additional specimens...

We propose a revised classification of Doradidae based on phylogenetic analyses of sequence data for one nuclear (rag1) and two mitochondrial (co1, 16s) genes, and corroborated by caudal-fin morphology. The molecular dataset comprises 174 doradid specimens representing all 31 valid genera, 83 of the 96 valid extant species and 17 species-level taxa...

The family Aspredinidae is a moderately diverse and broadly distributed group of freshwater fishes endemic to South America. Commonly known as Banjo Catfishes, Aspredinidae currently includes 44 valid species divided among 13 genera. The first species-comprehensive hypothesis on phylogenetic relationships among aspredinids is presented. The phyloge...

Trachydoras is a genus of Doradidae (thorny catfishes) with five nominal valid species distributed in lowland areas of the Amazon, Orinoco, Paraná-Paraguay and Essequibo river basins of South America. A sixth species is described here as Trachydoras gepharti and diagnosed by five characteristics unique among congeners: mental barbels thick, tapered...

Scientists building the Tree of Life face an overwhelming challenge to categorize phenotypes (e.g., anatomy, physiology) from millions of living and fossil species. This biodiversity challenge far outstrips the capacities of trained scientific experts. Here we explore whether crowdsourcing can be used to collect matrix data on a large scale with th...

The Widemouth Blindcat, Satan eurystomus Hubbs and Bailey 1947, was the second of four stygobitic species of Ictaluridae discovered in the subterranean waters of southern Texas and northeastern Mexico. The skeletal anatomy of Satan has been scarcely known from a few, dated radiographs. Using additional radiographs and high resolution CT-datasets fo...

Oral presentation on the ASIH Joint Meeting, no full-text available

Baryoncistrus beggini, new species, Is described from the upper Rio Orinoco and lower portions of its tributaries, the Rio Guaviare In Colombia and Rio Ventuari in Venezuela. Baryancistrus beggini Is unique within Hypostominae in having a uniformly dark black to brown base color with a blue sheen in life, and the first three to five plates of the m...

Se describen cerca de 350 especies de peces, en parte con diseños de características morfológicas importantes para su determinación. Al final del libro se presentan fotos en color de las especies descritas. De especial interés son los primeros capítulos del libro, un capítulo extenso resume el conocimiento sobre el desarrollo geológico la biogeogra...

Se presenta una lista elaborada usando material depositado en la colección ictiológica del Instituto de Ciencias Naturales de la Universidad Nacional del Colombia de las especies de pees de la zona sur del Trapecio Amazónico entre las poblaciones de Leticia y Puerto Nariño. La mayor parte del material fue colectado en los arroyos selváticos La Aren...