Posts Tagged ‘Diplocentrus’


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Abstract

Scorpions are among the oldest terrestrial arthropods, which are distributed worldwide, except for Antarctica and some Pacific islands. Scorpion envenomation represents a public health problem in several parts of the world. Mexico harbors the highest diversity of scorpions in the world, including some of the world’s medically important scorpion species. The systematics and diversity of Mexican scorpion fauna has not been revised in the past decade; and due to recent and exhaustive collection efforts as part of different ongoing major revisionary systematic projects, our understanding of this diversity has changed compared with previous assessments. Given the presence of several medically important scorpion species, the study of their venom in the country is also important. In the present contribution, the diversity of scorpion species in Mexico is revised and updated based on several new systematic contributions; 281 different species are recorded. Commentaries on recent venomic, ecological and behavioral studies of Mexican scorpions are also provided. A list containing the most important peptides identified from 16 different species is included. A graphical representation of the different types of components found in these venoms is also revised. A map with hotspots showing the current knowledge on scorpion distribution and areas explored in Mexico is also provided.

See here at http://www.mdpi.com/2072-6651/8/1/2

 

Abstract
The scorpion genus Diplocentrus Peters, 1861, endemic to North and Central America, is the most diverse in family Diplocentridae
Karsch, 1880. There is considerable morphological variation among the species of Diplocentrus. It is necessary to test the monophyly and
phylogenetic position of Diplocentrus in order to revise its diagnosis and taxonomic limits. The present contribution provides a phylogenetic
analysis of 29 species of Diplocentrus, five exemplar species representing the three putatively most closely related diplocentrid genera,
and an exemplar of a more distantly related diplocentrid genus. The analysis was based on 95 morphological characters and 4202 aligned
nucleotides from DNA sequences of five markers in the nuclear and mitochondrial genomes. Separate and simultaneous parsimony analyses
of the morphological and DNA sequence data were conducted with equal weighting and six implied weighting regimes. The nuclear
and mitochondrial DNA datasets were also analyzed separately and simultaneously with Bayesian inference. The resulting topologies
recovered the monophyly of Diplocentrus, with the exception of two neobothriotaxic species from central Mexico, for which a new genus
Kolotl Santibáñez-López et al., 2014, is justified. The keyserlingii group, as previously defined, was not monophyletic due to the placement
of two species in the mexicanus group; the rest of its component species were monophyletic, however. A third clade was recovered that has
not been previously recognized: the zacatecanus group, comprising four species from northern Mexico and the southwestern U.S.A. New
insights are provided concerning relationships among Diplocentrus and the diplocentrid genera Bioculus Stahnke, 1968 and Didymocentrus
Kraepelin, 1905, the phylogenetic positions of which were previously ambiguous..

http://www.senckenberg.de/files/content/forschung/publikationen/arthropodsystematics/asp_72_3/03_asp_72_3_santibanez_et_al_257-279.pdf

Edit note with format issues…Thanks and will try to correct.

Koloti genus

Abstract:

The monophyly and phylogenetic position of Diplocentrus Peters, 1861, has remained ambiguous since the first published phylogenetic analysis of diplocentrid relationships, in which it was rendered paraphyletic by the placement of exemplar species from two other diplocentrid genera, Bioculus Stahnke, 1968, and Didymocentrus Kraepelin, 1905. The discovery of two diplocentrids with neobothriotaxic pedipalps, Diplocentrus magnus Beutelspacher and López-Forment, 1991, and Diplocentrus poncei Francke and Quijano-Ravell, 2009, from the central Mexican states of Guerrero and Michoacán, respectively, raised further questions about the limits of Diplocentrus. A recent phylogenetic analysis of 29 species of Diplocentrus and five exemplar species of the most closely related genera, based on 95 morphological characters and 4202 aligned nucleotides from DNA sequences of five markers in the nuclear and mitochondrial genomes, recovered the monophyly of Diplocentrus, excepting two neobothriotaxic species from central Mexico, justifying their removal from Diplocentrus. In the present contribution, Kolotl, n. gen. is created to accommodate the two species, Kolotl magnus (Beutelspacher and López-Forment, 1991), n. comb., and Kolotl poncei (Francke and Quijano-Ravell, 2009), n. comb., and both are redescribed.
Picture from the Scorpion Files Blog site.
American Museum of Natural History at the Digital Library.
URL @ http://digitallibrary.amnh.org/dspace/handle/2246/5465

Abstract

A new species of the genus Diplocentrus Peters, 1861 is described, based on several specimens collected in the Mexican state of Oaxaca. It is characterized by a high telotarsal spiniform setae count (4-5/5:5/6:6/6:6/6-7), and the pectinal tooth counts of 12–15, mode = 13 (male) or 11–13, mode = 12 (female). With the description of this species, the diversity of the genus is increased to 51 species in Mexico.

Introduction

The genus Diplocentrus Peters, 1861 comprises nearly 60 species, 51 of them are distributed in Mexico, is the most diverse genus in the family Diplocentridae Karsch, 1880 (Santibáñez-López et al. 2013a). The Mexican species were divided in two groups by Hoffmann (1931), based on size and coloration. Francke (1977) redefined the groups in a key to identification of the Diplocentrus species occurring in the Mexican state of Oaxaca, based on cheliceral and pedipalp femur ratios, and renamed the whitei group to mexicanus group because it included type species (Diplocentrus mexicanus Peters, 1861). Nevertheless, Francke (1978) realized that the distinction of both groups was problematic because the diagnostic characters of the pedipalp femur were also used to separate other genera in the family. Recently, Santibáñez-López et al. (2013a) presented an operational diagnosis for the keyserlingii group; but did not assume that it was monophyletic, pending further investigation of Diplocentrus phylogeny. Fifteen species are reported for the Mexican state of Oaxaca, nine of them belong to the keyserlingii group, and six to the mexicanus group. In the present contribution, Diplocentrus franckei, sp. n. from the mexicanus group is described from Oaxaca, Mexico; it is compared to its most morphological similar species.

Citation: Santibáñez-López CA (2014) A new species of the genus Diplocentrus Peters, 1861 (Scorpiones, Diplocentridae) from Oaxaca, Mexico. ZooKeys 412: 103–116

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Blog title update:  Expanding  into news with general arachnids relevant to North America all in one place.  Mexico and the western states in the U.S. presents various transitions zones and micro habitats and is thus unique in arachnid taxa.

Hope you enjoy the site for educational and regional informations !

Sincerely,

Chad Lee B.Sc. 1995.

Biology and Natural Resource Management.  Texas Certified Applicator

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The scorpion genus Diplocentrus Peters, 1861, comprising more than 50 species, most of

The scorpion genus Diplocentrus Peters, 1861, comprising more than 50 species, most of which are endemic to Mexico, is the most diverse in the family Diplocentridae Karsch, 1880 (Santibáñez-López et al., 2011). Hoffmann (1931) divided the Mexican species into two groups, the whitei group and the keyserlingi group, based largely on differences in size and coloration. Francke (1977) redefined these groups. The whitei group, renamed the mexicanus group because it included the type species of the genus, comprised species with short cheliceral fingers and the pedipalp femur wider than high. The keyserlingii group comprised species with long cheliceral fingers and the pedipalp femur higher than wide. Several new species of Diplocentrus were since described, but no attempt was made to synthesize the taxonomy of the species assigned to either group or further clarify the validity of the groups. In the present contribution, the species of Diplocentrus with the pedipalp femur higher than wide are reviewed. An operational diagnosis is provided for the keyserlingii group. Diplocentrus formosus Armas and Martín-Frías, 2003, previously synonymized with Diplocentrus tehuano Francke, 1977, is reinstated. Revised, updated diagnoses are provided for all previously described species and three new species, Diplocentrus kraepelini, n. sp., Diplocentrus sagittipalpus, n. sp., and Diplocentrus sissomi, n. sp., are described. The female of Diplocentrus mitlae Francke, 1977, is described for the first time. A dichotomous key is provided for identification of the 10 species in the keyserlingii group.

Url:  http://digitallibrary.amnh.org/dspace/handle/2246/6438

 

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