Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

The geographic distribution of the species of Datura in Mexico was analyzed using numerical analysis ofnatural populations documented by herbarium specimens. A map of Mexico was divided into 239, 1° x 1° squares(latitude and longitude) which were used as sampling geographical units and in which the presence or absence ofeach species of Datura was recorded. Multivariate procedures were applied: a), TWINSPAN classification to defineDatura´s main distribution areas; b), Detrended Correspondence Analysis (DCA) to define Datura´s main distributiongradients, and c), Canonical Correspondence Analysis (CCA) to relate distribution patterns with geographical andclimatic factors. Species of Datura were found in 69% (165) of the squares. TWINSPAN defined 14 groups which,when associated with Mexico’s biogeographic provinces, were concentrated in the northwestern Mexican provincesas well as in the Altiplano Norte and Altiplano Sur and the Sierra Madre Occidental. DCA indicated that Datura’smain distribution patterns are explained by 3 principal gradients: altitude, humidity, and latitude. The CCA identifiedlongitude, precipitation of the driest quarter, altitude, and average temperature of the warmest quarter as the mostimportant variables affecting Datura´s distribution patterns. The Depresión del Balsas region of central Mexico is thearea with greatest species richness of Datura.

Se registró una hembra de Basiliscus vittatus a orilla del río Mezonate en el municipio de Tenampulco de lasierra Norte de Puebla. Éste es el segundo registro de la especie en el estado, pero en una provincia fisiográfica distinta,con el cual se amplía el área de distribución para el estado.

Here we present the first known records for Mexico and the Neotropics of arthropods associated with theterrestrial bromeliad Greigia juareziana. The site locality for the collection of the host species is the southeast portionof the San Martín Tuxtla volcano in the state of Veracruz, Mexico. Four species of arthropods were detected within theleaf axils and infloresences of the bromeliad, 3 of which were insects Anasa bellator, Proxis punctulatus and Apion sp.belonging to the Orders of Hemiptera and Coleoptera. The remaining species was identified only to family (Myriapoda:Chilopoda: Lithobidae).

Strepsylla Traub, 1950 is considered a New World flea genus, parasitizing, in most cases, species of Muridae,particularly peromyscines. Thirteen species of Strepsylla are addressed with respect to their taxonomic characters, hostpreferences and geographic distribution. A detailed list of material is included.

En 1997 fue descrita Ceratozamia mixeorum de la Sierra Mixe en el estado de Oaxaca, región de la cualesta especie es endémica. Sin embargo, se detectaron algunos errores al momento de designar el holotipo y los isotiposrespectivos. Con base en lo anterior y de acuerdo con el Código Internacional de Nomenclatura Botánica, aquí sepresenta la lectotipificación para la especie; para ello, se designa como lectotipo un ejemplar depositado en el HerbarioXAL, que había sido designado como isotipo por los autores del nombre de la especie.

The Monk Parakeet (Myiopsitta monachus) is native to South America and has been introduced by the pet market to several countries around the world. In this note, we compiled records for this species in Mexico, also reporting the first sight-recording of this species in the state of Michoacán and several nesting localities within the Metropolitan area of Mexico City. Most records are from escaped/released individuals from captivity. Also, we review the negative effects that this invasive species has had around the world. All records for this species in Mexico suggest the possible beginning of a massive invasion that could have dramatic negative ecological and economical effects throughout this biodiverse country.

Se efectúa un análisis taxonómico y geográfico de Bryconamericus peruanus y se compara con las especiesde este género presentes en las vertientes del Pacífico sur en Colombia, Ecuador y Perú. Bryconamericus peruanusrestringe su distribución al sistema hidrográfico del Pacífico en Perú y se plantea que algunas formas del Pacífico yAmazonas de Ecuador son especies por describir. Los caracteres asociados al dimorfismo sexual, como ganchos entodas las aletas con radios excepto la aleta caudal, son útiles en la diferenciación de B. peruanus y Bryconamericus sp.1con respecto a B. brevirostris, B. dahli, B. guaytarae, B. miraensis, Bryconamericus sp. 2 y Bryconamericus sp. 3. Deacuerdo con la forma (de la mandíbula superior, longitud aleta dorsal-hipurales y longitud pedúnculo caudal), el análisisde componentes principales distingue 2 grupos de especies: I) B. peruanus, B. brevirostris, B. guaytarae, B. miraensisy Bryconamericus sp. 3 y II) B. dahli, Bryconamericus sp. 1 y Bryconamericus sp. 2.

Se describe Centruroides chamela sp. nov. de Chamela en el estado de Jalisco, México. Se comparacon C. elegans (Thorell), especie con la que es simpátrida. También se compara con las especies morfológica ygeográficamente más cercanas: C. mascota Ponce-Saavedra y Francke, C. hirsutipalpus Ponce-Saavedra y Francke yC. tecomanus Hoffmann. Además, con C. meisei Hoffmann, que habita en las costas de Guerrero, porque este taxónse había considerado como subespecie de C. elegans. En la comparación se incluyen C. infamatus (C.L. Koch) y C.ornatus (Pocock), por ser especies “rayadas” registradas para el estado de Jalisco.

Sampling with a single bait as a lure is a commonly used practice in studies of necrophilous insectcommunities. Here, we determined if there were differences in necrophilous insect species richness and abundancewhen attracted to 4 types of carrion: squid, bird, lizard, and mouse. A comparison between necrophagous and predatoryinsects was also made to detect whether they differ in their abundance, depending on the bait used. Thirteen species ofSilphidae, Staphylinidae (Coleoptera), Calliphoridae, and Sarcophagidae (Diptera) were collected in the baited traps;no single bait was able to attract all species. The abundances of 5 species varied significantly depending on the typeof bait used. Predatory insects were less abundant than necrophagous insects in lizard and mouse baits. These resultsshow that an evaluation of the structure of a necrophilous insect community can depend on the bait used for sampling.