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18 resultados encontrados para: AUTOR: Mercado Salas, Nancy Fabiola
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1.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

Mastigodiaptomus is the most common diaptomid in the Southern USA, Mexico, Central America and Caribbean freshwaters, nevertheless its distributional patterns and diversity cannot be stablished because of the presence of cryptic species hidden under wide distributed forms. Herein we study the morphological and molecular variation of the calanoid fauna from two Biosphere Reserves in the Yucatan Peninsula and we describe a new species of the genus Mastigodiaptomus. Our findings are compared with other lineages previously found in Mexico. Mastigodiaptomus siankaanensis sp.n. is closely related to M. nesus, from which can be recognized because of the absence of the spinous process in segment 10 of male A1 and the seta formula and ornamentation of female A1. The mitochondrial cytochrome c subunit I gene (COI) revealed a mean of 0 – 2.77% K2P divergence within M. siankaanensis sp.n. and 14.46 – 22.4% from other Mastigodiaptomus species. Within the new species three different populations were detected, two distributed in close localities (sympatric) and the third consistent with allopatric distribution. The General Mixed Yule Coalescence method (GMYC) delimited eight species of Mastigodiaptomus distributed in Mexico. The high diversity and endemism of Mastigodiaptomus in the Yucatan Peninsula and Antilles suggest a Neotropical origin of the genus.


2.
- Artículo con arbitraje
*En hemeroteca, SIBE-Chetumal-Samples, SIBE-Tapachula-Samples
Taxonomic revision of the Mexican Eucyclops (Copepoda: Cyclopoida) with comments on the biogeography of the genus
Mercado Salas, Nancy Fabiola ; Suárez Morales, Eduardo (coaut.) ; Silva Briano, Marcelo (coaut.) ;
Clasificación: AR/595.340972 / M4
Contenido en: Journal of Natural History Vol. 50, no. 1-2 (2016), p. 25-147 ISSN: 1464-5262
Bibliotecas: Campeche , Chetumal , Villahermosa
Cerrar
SIBE Campeche
5204-30 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Chetumal
5204-20 (Disponible)
Disponibles para prestamo: 1
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SIBE Villahermosa
ECO050006204 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Chetumal-Samples, SIBE-Tapachula-Samples
Resumen en: Inglés |
Resumen en inglés

Based on the examination of specimens deposited in different national and international biological collections, we reviewed the ca. 800 records of the genus Eucyclops in Mexico and compared them with the type material of presumedly widespread species. Resulting from our taxonomical analysis, in this contribution we recognise 17 species dwelling in Mexico. Complementary upgraded descriptions of eight species emphasising newly introduced taxonomic characters are also presented from the examination of Mexican specimens. These species include E. elegans, E. prionophorus, E. festivus, E. leptacanthus, E. torresphilipi, E. chihuahuensis, E. cuatrocienegas and the recently described E. tziscao and E. angeli. In addition, the use of upgraded descriptive standards involving new morphological characters allowed the discovery of six new species that are described in thiswork: E. alekseevi sp. nov., E. wixarica sp. nov., E. defayeae sp. nov., E. mittmanni sp. nov., E. estherae sp. nov. and E. ishidai sp. nov. Most of these species were previously recorded in Mexico under different names. The occurrence of E. pectinifer, E. elegans, E. prionophorus and E. leptacanthus in Mexico is herein confirmed. We propose the ornamentation patterns of the fourth swimming legs (i.e. basipodite, coxal plates) as reliable additional characters to recognise closely related species of Eucyclops.

The importance of the antennal basis ornamentation in the taxonomy of the genus is supported by our data. We evaluated the taxonomic value of 113 morphometric and binary characters using statistical methods; results of this analysis showed that morphometric characters alone overlap and thus have a limited value to distinguish species of Eucyclops. We include comments on E. serrulatus s. str. in order to provide a complete comparison frame among members of the serrulatus- species complex, but we did not find the strict form in the samples examined. A key to the Mexican species of the genus is also provided.


3.
- Artículo con arbitraje
Morphological variation of Eucyclops elegans (Herrick, 1884) (Copepoda: Cyclopoida) in the Americas and comments on records of Eucyclops conrowae Reid, 1992
Mercado Salas, Nancy Fabiola ; Suárez Morales, Eduardo (coaut.) ;
Contenido en: Journal of Natural History DOI: 10.1080/00222933.2014.897766 (2014), p. 1-20 ISSN: 0022-2933
Resumen en: Inglés |
Resumen en inglés

Based on an examination of material from different areas of the American continent, we evaluate the morphological variations of Eucyclops elegans (Herrick, 1884) with an emphasis on characters used in the current taxonomy of the genus. Eucyclops elegans is clearly a member of the serrulatus group. Differences in both female and male specimens from North America and South America and the lack of records in southern Mexico and Central America suggest that it is possible that this nominal species contains at least two taxa. Characters such as the ornamentation of the antennal basis and coxa of P4 are described for the tropical species E. conrowae Reid, 1992. This species is clearly not a member of the serrulatus group and differences with respect to the type specimens indicate that records of E. conrowae in Mexico do not correspond to this taxon and should be reassigned to other species.


4.
- Artículo con arbitraje
On kiefer’s American Eucyclops (Copepoda, Eucyclopinae): redescriptions and comments on the historical records of E. delachauxi, E. prionophorus, E. bondi and E. leptacanthus
Mercado Salas, Nancy Fabiola (autora) ; Suárez Morales, Eduardo (autor) ;
Disponible en línea
Contenido en: ZooKeys No. 402 (2014), p. 1-41 ISSN: 1313-2970
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Resumen en: Inglés |
Resumen en inglés

The freshwater copepod genus Eucyclops contains many supposedly cosmopolitan species whose taxono­mic status is still under discussion; some of them represent species complexes. The problem is not exclusive to these widespread species; there are several American Eucyclops needing a taxonomic re-evaluation. Based on the examination of Friedrich Kiefer’s collection in Karlsruhe, Germany, the type specimens of four American species of Eucyclops (E. delachauxi (Kiefer, 1926), E. prionophorus Kiefer, 1931, E. bondi Kiefer, 1934, E. leptacanthus Kiefer, 1956) were re-examined and redescribed using upgraded descriptive standards. Kiefer’s translated descriptions and unpublished original drawings of these species are also presented. Characters like the ornamentation of the antennal basis, ornamentation of intercoxal sclerites of the swimming legs 1–4, length of basipodal seta of leg 1, ornamentation of caudal rami, the presence of aesthetascs and modified setae on the antennules in male, and the structure of the male sixth leg are compared herein to aid a more accurate separation of these American species. A revision of the American records of these species confirms that some are likely to refer to undescribed species. Overall, the diversity of the American Eucyclops appears to be underestimated and certainly deserves further study.


5.
- Artículo con arbitraje
Conservation status of the inland aquatic crustaceans in the Yucatan Peninsula, Mexico: shortcomings of a protection strategy
Mercado Salas, Nancy Fabiola ; Morales Vela, José Benjamín (coaut.) ; Suárez Morales, Eduardo (coaut.) ; Iliffe, Thomas M. (coaut.) ;
Contenido en: Aquatic Conservation: Marine and Freshwater Ecosystems Vol. 23, no. 6 (December 2013), p. 939-951 ISSN: 1099-0755
Resumen en: Inglés |
Resumen en inglés

1. The Yucatan Peninsula (YP), Mexico, is a large karstic Neotropical system hosting a highly diverse crustacean fauna related to epigean and subterranean aquatic habitats. There are more than 40 hypogean endemic species, thus qualifying as a subterranean biodiversity hotspot. 2. In view of the relevance of both the YP karstic aquifer and its related crustacean fauna, the spatial distribution of 212 species from 1165 geo-referenced records of the inland aquatic crustaceans were analysed in relation to the geographic coverage of protected natural areas (PNAs) of the YP. The data analysed were obtained from sources including the authors’ own observations, published literature, and institutional and government databases. 3. The YP is an area with a high biodiversity of continental crustaceans and is also an important area of endemism worldwide. However, most of the crustacean fauna is at risk. Only 18.5% of the crustacean species recorded in the YP and only 3.2% of the endemic forms are distributed within the limits of a protected area. In addition, only five of the 48 endemic species are listed in the Mexican Official Standard (NOM-059-2010) and none of them occurs in a protected area. 4. The groups with the highest endemism are the Remipedia and Ostracoda, each with two known YP endemic species. Peracarids are also highly endemic in the YP (62%), followed by Copepoda (27%), Decapoda (18%), and Branchiopoda (1.5%). 5. Currently, the areas of most concern, owing to high tourist pressures, are the ‘Corridor Tulum - Puerto Morelos’ and the ‘Ring of Cenotes’, both having significant numbers of endemic forms. A revision of the PNAs’ management programmes to incorporate aquatic ecosystems and biota, the expansion of selected PNAs to provide protection to critical unprotected areas, and increased research activities focused on the aquatic fauna are recommended actions.


6.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

Two new species of the freshwater cyclopoid genera Eucyclops are described, Eucyclops tziscao sp. n. and E. angeli sp. n. Both species belong to the serrulatus-group defined by morphological features such as: the presence of distal spinules or hair-like setae (groups N1 and N2) on frontal surface of antennal basis; the fourth leg coxa with a strong inner spine that bears dense setules on inner side, yet proximally naked (large gap) on outer side; and a 12-segmented antennule with smooth hyaline membrane on the three distalmost segments. Eucyclops tziscao sp. n. is morphologically similar to E. bondi and E. conrowae but differs from these species in having a unique combination of characters, including a caudal ramus 4.05±0.25 times as long as wide, lateral seta of Enp3P4 modified as a strong, sclerotized blunt seta, coxal spine of fourth leg with inner spinule-like setules distally, and sixth leg of males bearing a strong and long inner spine 2.3 times longer than median seta. Eucyclops angeli sp. n. can be distinguished by an unique combination of morphological features: the short caudal ramus; the long spine on the sixth antennular segment of A1; the presence of one additional group of spinules (N12’) on the caudal surface of A2; the presence of long setae in females, or short spinules in males on the lateral margin of fourth prosomite; the strong ornamentation of the intercoxal sclerite of P4, specially group I modified as long denticles; the distal modified setae of Exp3P3 and Exp3P4 in females and males; and the short lateral seta of P5. Finally, we report on a new record of E. festivus in México, and add data on morphology of the species.


7.
- Artículo con arbitraje
*En hemeroteca, SIBE-Chetumal-Samples, SIBE-Campeche-Samples, SIBE-Villahermosa-Samples, SIBE-Tapachula-Samples
A new acanthocyclops kiefer, 1927 (Cyclopoida: Cyclopinae) from an ecological reserve in Mexico City
Mercado Salas, Nancy Fabiola ; Álvarez Silva, Carlos (coaut.) ;
Contenido en: Journal of Natural History Vol. 47, no. 5-12 (2013), p. 499-515 ISSN: 0022-2933
Cerrar
SIBE Campeche
36695-30 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Chetumal
36695-20 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
36695-50 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Villahermosa
36695-40 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Chetumal-Samples, SIBE-Campeche-Samples, SIBE-Villahermosa-Samples, SIBE-Tapachula-Samples
Resumen en: Inglés |
Resumen en inglés

A new species of Acanthocyclops is decribed from an Ecological Reserve in Mexico City. Acanthocyclops eduardoi sp. nov. was assigned as a member of the Acanthocyclops vernalis–robustus complex and it differs from its congeners by a combination of characters including 17 segmented antennules, the ornamentation of spinules on the ventral and dorsal surface of caudal ramus, a short dorsal seta (0.47–0.56), an elongated third segment of endopodite of fourth leg (length/width 3.10–3.80) and, the length/width ratio of caudal ramus ranging from 4.30 to 4.35. The male of A. eduardoi sp. nov. shows a unique ornamentation pattern on the coxal plate of the fourth leg. The new species resembles other species such as Acanthocyclops marceloi, Acanthocyclops caesariatus, Acanthocyclops brevispinosus, Acanthocyclops trajani and Acanthocyclops einslei. The number of species of the genus in the Mexican Plateau is increased so the diversity of the genus in this biogeographic province may be underestimated and deserves further study.


8.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

A new species of the freshwater cyclopoid copepod genus Metacyclops Kiefer, 1927 is described from a single pond in northern Mexico, within the binational area known as the Chihuahuan Desert. This species belongs to a group of Metacyclops species with a 3443 spine formula of swimming legs. It is morphologically similar to Metacyclops lusitanus Lindberg, 1961 but differs from this and other congeners by having a unique combination of characters, including a caudal rami length/width proportion of 3.5–3.8, a innermost terminal seta slightly longer than the outermost terminal seta, intercoxal sclerites of legs 1-4 naked, a strong apical spine of the second endopodal segment of leg 1 and one row of 6-8 small spinules at the insertion of this spine. The finding of this species represents also the first record of the genus in Mexico and the third in North America, where only two other species, M. gracilis (Lilljeborg, 1853) and M. cushae Reid, 1991 have been hitherto reported. This is also the first continental record of a species of Metacyclops from an arid environment in the Americas. This species appears to be endemic to the Chihuahuan Desert, thus emphasizing the high endemicity of this area.


9.
- Artículo con arbitraje
A new stygobiotic species of Diacyclops kiefer, 1927 (Copepoda, Cyclopidae) from caves in New Mexico, United States
Suárez Morales, Eduardo ; Mercado Salas, Nancy Fabiola (coaut.) ; Barlow, Rachel (coaut.) ;
Contenido en: Crustaceana Vol. 86, no. 9 (2013), p. 1155-1177 ISSN: 0011-216X
Resumen en español

Se describe una nueva especie de copépodo ciclopoide de aguas continentales del género Diacyclops proveniente de un sistema de cuevas en el sureste de Nuevo México, Estados Unidos. La nueva especie, D. nikolasarburni n. sp. difiere de sus congéneres por tener una combinación única de caracteres que incluyen: anténulas con 17 segmentos, patas natatorias 1-4 con ramas de tres segmentos, formula espinaria básica de 2333 con un patrón altamente variable, margen interno de las ramas caudales desnudo, pero superficie dorsal con espínulas, espinas terminales del tercer segmento endopodal de la cuarta pata subiguales, espina interna de la quinta pata aproximadamente del mismo largo que el segmento. Esta especie tiene una variable proporción largo/ancho de las ramas caudales (4.6-6.0, promedio: 5.0); la seta lateral de la rama caudal se inserta en el 1/4 distal de la rama. La fórmula espinaria 2333 es dominante (55%) en la población pero otros patrones también estuvieron presentes. La nueva especie pertenece al Grupo 1 de especies de Diacyclops (sensu Reid & Strayer, 1994). La población local de esta especie estigobiótica es resultado, probablemente, del proceso de radiación de formas epigeas ampliamente distribuidas de Diacyclops y es posiblemente endémica de este sistema de cavernas.

Resumen en inglés

A new species of the freshwater cyclopine copepod genus Diacyclops is described from a North American cave system in SE New Mexico, U.S.A. The new species, D. nikolasarburni n. sp., differs from its congeners by its having of a unique combination of characters including: 17-segmented antennules, three-segmented rami in legs 1-4, a basic 2333 spinal formula with a highly variable pattern, naked inner margin of caudal rami, but dorsal surface with spinules, subequal terminal spines of leg 4 endopod, and inner spine of fifth leg about as long as bearing segment. This species has also a variable length/width ratio of the caudal ramus (4.6-6.0, average 5.0); the lateral caudal seta is inserted on the distal one-quarter of ramus. The 2333 spinal formula was dominant (55%) in the population but other patterns were also present. The new species belongs to Group 1 species of Diacyclops (sensu Reid & Strayer, 1994). The local population of this stygobiotic species probably resulted from radiation-stranding processes of epigean forms of widely distributed Diacyclops and is probably endemic to this cave system.


10.
- Artículo con arbitraje
The non-indigenous parasitic copepod Neoergasilus japonicus (Harada) (Cyclopoida) from central Mexico: the earliest invasion in continental America
Suárez Morales, Eduardo ; Mercado Salas, Nancy Fabiola (coaut.) ;
Contenido en: BioInvasions Records Vol. 2, no. 3 (2013), p. 201–220 ISSN: 2242-1300
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Resumen en: Inglés |
Resumen en inglés

The Eastern Asian ectoparasitic copepod Neoergasilus japonicus (Harada, 1930) is a widely spread species with a high prevalence on many freshwater teleosts. It was recorded for the first time in Europe 45 years ago and continued its invasion to new geographic regions. Its presence in North America was first detected in 1993, followed by only two other continental records. In this work we present an illustrated record of N. japonicus from plankton samples collected during 1990 in a microreservoir of central Mexico. We confirm that this parasitic copepod was already present in continental America at least 3 years before previously known. This is the third published record of this Asian copepod in the Neotropical region. Its occurrence in Mexico is attributed to different events of introduction by human agency. This report supports the notion that N. japonicus is more widespread in Middle America than previously thought and it is intended to aid in the historical monitoring of the invasion of this species.