Rina Ramirez- National University of San Marcos
Rina Ramirez
- National University of San Marcos
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43
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Publications (43)
En el presente estudio se describe la histología del talón y del saco glandular anexo (SGA) del sistema reproductor de cinco especies de Megalobulimus (Gastropoda, Stylommatophora, Strophocheilidae). Para ello, se utilizó la técnica de coloración de Hematoxilina-Eosina. Se encontró que el talón es una estructura muscular compacta que alberga la bol...
Small species with high home fidelity, high ecological specialization or low vagility are particularly prone to suffer from habitat modification and fragmentation. The Lima leaf-toed gecko ( Phyllodactylus sentosus) is a critically endangered Peruvian species that shelters mostly in pre-Incan archeological areas called huacas , where the original e...
Apple snails of the genus Pomacea Perry, 1810 (Mollusca: Caenogastropoda: Ampullariidae) are native to the Neotropics and exhibit high species diversity, holding cultural and ecological significance as an important protein source in Peru. However, most genetic studies in Pomacea have focused mostly on invasive species, especially in Southeast Asia,...
DNA barcoding is a powerful tool to identify species using nucleotide differences found in the cytochrome oxidase I mitochondrial gene between species. Since it was proposed, several projects are promoting the construction of a DNA barcode library for all eukaryotes. DNA barcoding in conjunction with single-gene species delimitation methods have be...
Apple snails of the genus Pomacea (Mollusca: Caenogastropoda: Ampullariidae) are native to the Neotropics and exhibit high species diversity. They hold cultural and ecological significance, serving as an important protein source in Peru. However, this genus has also received broad interest worldwide due to its invasive capacity, especially in South...
The Yarinacocha lake is an emblematic ecosystem of the Peruvian Amazon, representing the main point of fish landing and a tourist attraction in the city of Pucallpa. The wide fauna diversity in this area has made it the target of various studies, although for fish species most of them were focused on commercial species. In this work, we carried out...
Two new species of apple snails are described, Pomacea penai sp. nov. and Pomacea reevei sp. nov. that are used as food resources in Peruvian Amazonia. We used anatomical and conchological features to diagnose these two species. Pomacea penai sp. nov. is characterized by a highly variable shell morphology, spire that is prominent to immersed, apica...
Andesiops peruvianus (Ulmer, 1920) is a small minnow mayfly with a distribution throughout the Andes Mountains, mainly in lotic environments. In recent years, the taxonomic status of the species has been shifting, even finding out molecular and morphological evidence to consider it as a cryptic species. In this work, we collected seven specimens of...
DNA barcoding has been used successfully in fish species identification and cryptic diversity detection, expanding knowledge about Neotropical ichthyofauna. Yarinacocha is a oxbow lagoon, which seasonally forms part of the Ucayali River, a tributary of the Amazon River. It is an important area for tourism, commercial fishing, and the extraction of...
Introduction: The Andean and Amazonian tropical ecosystems determine the great biodiversity found in Peru. However, studies on mosquitoes (Diptera: Culicidae) in the country are scarce, resulting in an information gap regarding their diversity, ecology, distribution and abundance.
Objective: To look for documented evidence on the diversity and dist...
Apple snails, family Ampullariidae, are conspicuous inhabitants of water bodies in Peruvian Amazonia, and they are a significant protein resource for mostly the native people. Despite recent efforts to resolve the evolutionary relationships within the genus Pomacea Perry, 1810, its diversity is still undoubtedly undersampled, and the identities of...
South America is a high biodiversity continent with five out of 13 countries considered megadiverse. Many major groups within this fauna exhibit high diversity, including non-marine molluscs. With at least 1401 known species, South American molluscs are seriously understudied. The aim of this paper is to review the conservation status of non-marine...
Introducción. Los ecosistemas tropicales andinos y amazónicos determinan la gran biodiversidad presente en Perú. Sin embargo, los estudios sobre mosquitos (Diptera: Culicidae) en el país son escasos, lo que resulta en un vacío de información en cuanto a su diversidad, ecología, distribución y abundancia.
Objetivo. Buscar evidencia documentada sobr...
La región biogeográfica del Valle de los Ríos Apurímac, Ene y Mantaro (VRAEM) en el Perú, son zonas privilegiadas que albergan una rica flora y fauna de especies únicas, poco conocidas por la ciencia o carentes de descripción y consideradas con alto grado de endemismo. En este grupo se encuentran los insectos que por su gran diversidad y abundancia...
On October 9, 2019, mosquito collections were conducted to update the mosquito species of medical importance in the Apurímac River Valley, Canayre, in the state of Ayacucho, Peru. Species collected included Culex (Carrollia) iridescens, which had been previously reported only in Colombia, Ecuador, and Brazil, this being the first national report of...
The original description of Helicina weyrauchiHaas, 1948, was based on shell material, as is the case for several helicinids in South America. We redescribe the species based on freshly collected material and provide the first anatomical description of a member of Helicinidae from northern Peru. The shell is characteristically white, with the first...
En la Amazonia Peruana los caracoles dulceacuícolas de la familia Ampullariidae son conocidos como churos y originalmente han sido descritas para Perú alrededor de 20 especies. Aunque son muy usadas para alimentación, medicina tradicional y objeto de muchos estudios para su cultivo e industrialización, solamente es mencionada en la literatura la es...
Population and species divergence in South America are usually attributed to geographical barriers in the form of rivers, mountains or climate. In western Amazonia (< 1000 m elevation) case studies addressing the ecological niche as a divergent selection agent are scarce. Using sequences from five plastid and six low-copy nuclear DNA regions, we re...
Apple snails belong to the genus Pomacea Perry, 1810 and are distributed mainly within South America. In Peru, some of these species are part of the diet of human Amazonian populations. Taxonomy of these snails has been relegated to conchological characters, and the studies of apple snails have been focused largely on mass production for aquacultur...
Se presenta una descripción detallada de la inflorescencia y flor masculina del género Orthopterygium (A. Gray) Hemsl. en comparación con su género hermano Amphipterygium Standl., ambos anteriormente ubicados en la familia Julianiaceae, con la finalidad de corroborar sus estatus taxonómicos. Se incluyen todas las especies de ambos géneros, O. huauc...
A major taxonomic problem around the genus Megalobulimus Miller,1878, the largest land snails in the Neotropics, is plasticity of conchological characters. Here we re-describe Megalobulimus leucostoma (Sowerby, 1835) and describe two new species of Megalobulimus from Southern Peru, Megalobulimus tayacajus sp.nov. and Megalobulimus inambarisense sp....
We report the snail Succinea peruviana in the diet of the Lomas lizard Microlophus tigris, which inhabit the mesohabitat from the formation forested of Lomas in the Lachay National Reserve. This is the first report of snails in the diet of Peruvian coastal desert lizards.
About DNA barcode application in Peru
Plasticity of conchological characters had led to erroneous descriptions and the accumulation of synonyms making difficult the discrimination among species. The land snail genus Megalobulimus is an example of this problem. Megalobulimus leucostoma (Sowerby, 1835) has three subspecies which are difficult to differentiate by using the original descri...
Megalobulimus K. Miller, 1878 is a genus of land snails that includes the largest living snails in the Neotropics. The main goal of this paper was to review all species of Megalobulimus that have a red lip, and which are distributed in Peru. We carried out a detailed description of their shells and soft parts, and conducted a multivariate analysis...
Acidophilic iron-oxidizing microorganisms are important in both environmental and biotechnological applications. These microorganisms are known to accelerate the dissolution of sulfur minerals such as pyrite (FeS2), leading to the acid mine drainage generation , a serious pollution problem, that makes these microorganisms essential to the commercia...
In this work we performed a biogeographic study of two genera of Amazonian land snails, Megalobulimus (Strophocheilidae) and Systrophia (Scolodontidae). We used samples from different regions of the Peruvian Amazon, as well as bibliographic information. We analyzed both nuclear (5.8S-ITS2-28S rRNA) and mitochondrial (16S rRNA) genes to reconstruct...
Peru is one of the principal countries in mining extraction of minerals like gold, zinc, plumb and tin. Cyanide is used in gold production this compound is very toxic especially for environment, by nature reaction with sulfur it converts into thiocyanate (-SCN). In this paper, we isolate -SCN degrading fungus from Junin and Tumbes mining zones. Str...
Peru is one of the principal countries in mining extraction of minerals like gold, zinc, plumb and tin. Cyanide is used in gold production this compound is very toxic especially for environment, by nature reaction with sulfur it converts into thiocyanate (⁻SCN). In this paper, we isolate -SCN degrading fungus from Junin and Tumbes mining zones. Str...
In this work we performed a biogeographic study of two genera of Amazonian land snails, Megalobulimus (Strophocheilidae) and Systrophia (Scolodontidae). We used samples from different regions of the Peruvian Amazon, as well as bibliographic information. We analyzed both nuclear (5.8S-ITS2-28S rRNA) and mitochondrial (16S rRNA) genes to reconstruct...
DNA barcoding analysis is based on the comparison of genetic distances to identify species using a segment of Cytochrome C Oxidase I (COI) gene. Species identification through DNA barcoding challenges problems in groups with high genetic diversity as molluscs. Thus, our aim was to estimate intraspecific divergence in the Amazonian land snail Systro...
Se describe la anatomía de la glándula pediosa de cinco especies de Megalobulimus (Megalobulimidae), y son comparadas con gastrópodos pulmonados Succineidae, Orthalicidae, Helicidae y Veronicellidae. Una sinapomorfía considerada para el clado Stylommatophora es la presencia de una membrana que aísla a la glándula pediosa de la cavidad visceral. Las...
The alignment of ribosomal genes is difficult due to insertion and deletion events of nucleotides, making the alignment ambiguous. This can be overcome by using information from the secondary structure of ribosomal genes. The aim of this study was to evaluate the utility of the secondary structure in improving the alignment of the 16S rRNA gene in...
En el presente trabajo se identifica una secuencia de DNA no esperada proveniente de los amplificados del gen 28S rRNA de moluscos terrestres. Las extracciones de DNA se realizaron del tejido del pie de caracoles terrestres por el método del CTAB modificado. Las PCRs fueron llevadas a cabo con primers universales para el gen COI e iniciadores diseñ...
The genera Bostryx and Scutalus (Orthalicidae: Bulimulinae) are endemics from South America. They are mainly distributed on the western slopes of the Peruvian Andes. The goal of the present work was to assess their evolutionary position among the stylommatophoran gastropods based on the 16S rRNA mitochondrial marker. Four sequences were obtained, a...
Los géneros Bostryx y Scutalus (Orthalicidae: Bulimulinae) son endémicos de América del Sur y están principalmente distribuidos en la vertiente occidental de los Andes del Perú. El objetivo del presente trabajo fue evaluar su posición evolutiva dentro de los gastrópodos Stylommatophora basada en el marcador mitocondrial 16S rRNA. Fueron obtenidas c...
Informe sobre el Inventario Preliminar de Moluscos colectados en la Reserva de Los Amigos de la Amazon Conservation Asociation.
Since the 1930s, alien fishes (fishes not native to Peru) have been introduced into the freshwater systems of Peru for different
purposes such as fish farming, the ornamental fish trade, public health applications, and sport fishing. The fish were introduced
either deliberately or casually into the three hydrographic systems of the country (Amazon,...
The partial list of the land snails Punctoidea from the "Centro de Pesquisas e Conservação da Natureza Pró-Mata" (São Francisco de Paula, State of Rio Grande do Sul, Brazil) (CPCN-PM) is presented herein. This list includes seven species, two of them new. The CPCN-PM is located between 600 and 950 m of altitude; it has a temperate super humid to hu...
Morphological and biological observations on populations of the land snail Bostryx conspersus, in three "Lomas"of the Central Coast of Peru, were carried out between 1979 and 1982. Three shell color varieties of B. conspersus are reponed herein, as well as its aestivation, activity and reproduction strategies. The possible interactions of B. conspe...
The aim of our work was to get several digitalized cartographic products for the interpretation of the biogeography of the eleven species of land mollusks in the area of Lima (sheet 25-i, 1:100,000). The methodology takes into consideration the geoprocessing through the digitalization followed by georeferencing and vectorization of the land surface...
