First record of Euagrus pristinus O. P.-Cambridge, 1899 (Araneae: Dipluridae) for Chiapas, Mexico (original) (raw)
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Acta Zoológica Mexicana (nueva serie), 2019
We carried out an intensive and systematized sampling of the spider fauna of the tropical mountain cloud forest (TMCF) in El Triunfo Biosphere Reserve, Chiapas, Mexico, in order to analyze their composition, species richness, abundance, and proportion of undescribed species, and to compare these results with those found in other TMCFs. We sampled ten plots in two seasons (dry and rainy) using different sampling techniques on two strata (ground and understory). A total of 7,432 specimens were collected corresponding to 28 families, 78 genera and 111 morphospecies. A high proportion of total species (58.6%) were undescribed species. For 11 species originally described from a single sex, we found the other sex. Five species and one genus were new records for the Mexican spider fauna. Understory stratum had higher numbers of species and individuals than ground stratum, and there was a high species turnover, with only 17% of the total species shared between strata. The spider fauna of El Triunfo shows similarities with other TMCFs (especially that on the same mountain range) concerning the identities of dominant and species-rich families, family and genera composition, the presence and relevance (in abundance or richness) of families that are uncommon in lowland tropical habitats (Linyphiidae and Theridiosomatidae), and in the high proportion of undescribed species. However, there is a high species turnover among sites (only 16% species shared), even at relatively short distances, that seems derived in part from the relative high proportions of endemic species. Our results suggest that high abundance of Theridiosomatidae and Linyphiidae, together with high species richness of this last family, could be used as conservation indicators for the Mexican TMCFs. The high numbers of undescribed species in the analyzed TMCFs, and their relatively high endemicity levels, support that TMCFs could be regarded as hotspots for the order Araneae.
Orb-weaver spiders (Araneae: Araneomorphae) from Calakmul municipality, Campeche, Mexico
Revista Mexicana de Biodiversidad, 2017
A study was conducted to determine the biological richness of orb-weaver spiders from Calakmul municipality, Campeche, Mexico. Material deposited in the Colección Nacional de Arácnidos, Instituto de Biología, UNAM was revised. In addition, 16 collecting events were made in 14 localities of Calakmul municipality during this study. The collections were made using beating sheets and manual technique. A total of 1,151 specimens belonging to 8 families, 56 genera and 100 species were reviewed and identified. Two new species and 3 considered possibly new were found, which cannot be confirmed until specimens of both sexes are collected. According to previous studies and this work, 10 families, 65 genera and 119 species of spiders of orb-weaver spiders are present in Calakmul municipality, of which 4 families, 32 genera and 74 species are recorded for the first time. Furthermore, this work adds 3 genera and 10 species to the known diversity for the country, making a total of 14 families, 139 genera and 685 species of orb-weaver spiders recorded for Mexico.
Tropical and Subtropical Agroecosystems, 2017
The Chelicerata are the second group of arthropods with the highest diversity after insects and they can inhabit almost all types of environments. The most current classification recognizes 11 orders and estimates in the number of species vary from 52,000 to 100,000. We have made an extensive literature review on the diversity of arachnids in the Yucatan Peninsula (YP) (excluding spiders and ticks). In Mexico there are 834 known species which represent 6% of the worldwide diversity. In the YP 63 records were found (58 species and 5 genera) of arachnids, which represent 6.8% of the Mexican species. According to our research, 28 of the 58 species (48%) in the YP were also record in other parts of Mexico, the continent and the world. Undoubtedly, the state of Yucatan is the best represented of the YP. In order to have a better understanding of the diversity of arachnid species is important to promote biological compendiums and sampling programs, which will improve the representation of...
Track analysis of the funnel-web spiders (Araneae: Agelenidae) of Mexico
Revista Mexicana de Biodiversidad, 2018
We analyzed distributional data of 59 species of funnel-web spiders (Araneae: Agelenidae) of Mexico. We constructed individual tracks for the species analyzed, based on published and unpublished records, and based on their overlap we obtained 9 generalized tracks. Three generalized tracks belong to the Californian Nearctic dominion (Nearctic region) and 6 generalized tracks extend along the Mexican transition zone. Seven generalized tracks are defined by species of the same genus or closely related genera and 2 generalized tracks are supported by species of distantly related genera, which shows that both spatial relationships and phylogenetic evidence support the existence of ancestral biotas including unrelated taxa.
Revista Mexicana de Biodiversidad, 2018
We analyzed distributional data of 59 species of funnel-web spiders (Araneae: Agelenidae) of Mexico. We constructed individual tracks for the species analyzed, based on published and unpublished records, and based on their overlap we obtained 9 generalized tracks. Three generalized tracks belong to the Californian Nearctic dominion (Nearctic region) and 6 generalized tracks extend along the Mexican transition zone. Seven generalized tracks are defined by species of the same genus or closely related genera and 2 generalized tracks are supported by species of distantly related genera, which shows that both spatial relationships and phylogenetic evidence support the existence of ancestral biotas including unrelated taxa. Resumen Se analizaron los datos de distribución de 59 especies de arañas tejedoras de red de embudo (Araneae: Agelenidae) de México. Construimos los trazos individuales de las especies analizadas utilizando registros publicados y sin publicar y, con base en su superposición, obtuvimos 9 trazos generalizados. Tres trazos generalizados pertenecen al dominio Neártico Californiano (región Neártica) y 6 trazos generalizados se extienden a lo largo de la Zona de Transición Mexicana. Por otro lado, 7 trazos generalizados están definidos por especies del mismo género o géneros relacionados cercanamente y 2 trazos generalizados están apoyados por especies de géneros relacionados lejanamente, lo cual muestra que las relaciones espaciales y la evidencia filogenética sustentan la existencia de biotas ancestrales conteniendo taxones no relacionados.
Two new species of the spider genus Ochyrocera Simon 1891 are described from Mexico. Ochyrocera jarocha new species was collected under rotten trunks and hollow trunks in a tropical rainforest, in San Martin Volcano, Veracruz, Mexico. Ochyrocera pojoj new species was collected in a mixed forest, under rotten trunks, in La Trinitaria, Chiapas, Mexico, which represents the third species described from the state of Chiapas. With the description of the two new species herein, six species of Ochyrocera are recorded from Mexico. An updated taxonomic identification key and a distribution map to the Mexican species are provided.