On Interaction Classification

Further classification is made of Lindquist's dichotomy of inter action effects. The extension hopefully reduces errors of inter pretation and provides a simple, accurate means of summarizing in teractions obtained.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67338/2/10.1177_001316448004000405.pd

A new species-group with new species of the genus Lasioseius (Acari: Mesostigmata: Blattisociidae) associated with neotropical hispine beetles in furled leaves of Heliconia

A new species-group of Lasioseius is described from adults and immatures of four newly described and one undescribed species associated with hispine beetles of the genera Cephaloleia and Chelobasis and other gamasine mites in the furled leaf habitat of Heliconia and related Zingiberales plants. The species-group presents a suite of apomorphic attributes placing it in the subgenus L. (Lasioseius). Adults and immatures were found moving freely on and off the beetles when the latter were exposed from their habitat. Larviparity is indicated by adult females gravid with fully developed larvae. Limited data suggest considerable host specificity between mites and their beetle hosts, indicating that there may be a vast diversity of these mites associated with hundreds of species of hispine beetles in the Neotropical Region. Keys are provided to currently accepted species-groups of Lasioseius and to the species within the new species-group

Observations on homologies of idiosomal setae in Zerconidae (Acari: Mesostigmata), with modified notation for some posterior body setae

The holotrichous condition for the idiosomal chaetotaxy of Zerconidae is reviewed. Using ontogenetic patterns of body setation of holotrichous taxa in other families of Gamasina for comparison, the homologies and notation for some of the podonotal and opisthosomal setae of zerconid mites are changed. These modifications lead to new interpretation of some of the apomorphic attributes used to characterize the family Zerconidae and superfamily Zerconoidea. The caudodorsal displacement of a pair of opisthogastric setae, JV5, so as to appear to be captured by the opisthonotal shield in deutonymphs and adults, is seen to be a unique characteristic of Zerconoidea. The caudal coalescence of the opisthonotal and opisthogastric shields, and the anterior displacement of setae J5 to a nearly transverse alignment with setae 24 well ahead of the caudal body margin, characterize Zerconidae.Se revisa la condición holotrica de la quetotáxia del idiosoma de Zerconidae. Utilizando por comparación los modelos ontogénicos de la quetotaxia del cuerpo determinada para los taxa holotricos en otras familias de Gamasina, se modifican las homologías y nomenclatura de algunas de las setas podonotales y opistonotales de los ácaros zerconidos. Estas modificaciones llevan a una nueva interpretación de alguno de los atributos apomórficos utilizados en la caracterización de la familia Zerconidae y la superfamilia Zerconoidea. El desplazamiento caudodorsal de un par de setas opistogástricas, JV5, que parecen ser capturadas por la placa opistonotal en las deutoninfas y adultos, parece ser una caracteristica única de Zerconoidea. La coalescencia caudal de las placas opistonotal y opistogástrica y el desplazamiento anterior de las setas J5 hasta alcanzar casi un alineamiento transversal con las setas 24, bien adelantadas respecto al margen caudal del cuerpo, caracteriza a Zerconidae.Nous revoyons l'holotrichie de l'idiosome des Zerconidae. Nous modifions les homologies et la notation de certains poils du podonotum et de I'opisthosoma des zerconides, en les comparant à des modèles ontogénétiques de pilosité dans les taxons holotriches des autres families de Gamasina. Ces modifications conduisent à une nouvelle interprétation de certains attributs apomorphes dont on se sert pour caracteriser la famille des Zerconidae et la superfamille des Zerconoidea. Le déplacement dorsocaudal d'une paire de poils de I'opisthogaster, JV5, tel qu'elle parait captée par le bouclier opisthonotal des deutonymphes et des adultes, est considéré comme un caractère unique des Zerconoidea. Les Zerconidae sont caractérisés par la coalescence cauda Ie des boucliers opisthonotal et opisthogastrique et par le deplacément antérieur des poils J5 jusqu'a un alignement transversal avec les poils 24 bien en avant du bord caudal du corps

A new genus of mites of the subfamily Platyseiinae associated with Azteca ant galleries in Cecropia trees in costa rica (Acari: Mesostigmata: Blattisociidae)

The genus Calyptoseius gen. nov. of the subfamily Platyseiinae Evans is described, based on adults and nymphs of one newly described species associated with ants of the genus Azteca occupying hollow stems of Cecropia in lowland rainforests of Costa Rica. Several unusual morphological attributes are noted, particularly the autapomorphic presence of four elongated setae on each of telotarsi II to IV. Some perspectives of these mites in the Cecropia-Azteca association are discussed, including a possible dispersal link via nematoceran flies to gain access to such an unusual habitat. The definition of the previously monobasic genus Cheiroseiulus is augmented, and also modified in view of an undescribed species at hand, and the subfamily definition is modified to account for morphological aspects of the new genus. A key to the genera of the Platyseiinae is given

Pyrosejidae, a new family of Trigynaspid Mites (Acari: Mesostigmata: Cercomegistina) from Middle America

ABSTRACT: A new family of trigynaspid mesostigmatic mites, Pyrosejidae, is described on the basis of a group of ten species collected from southern Mexico, Central America, and northern South America. Mites of this group are found in leaf litter habitats of a variety of forest types, including tropical rainforests, cloudforests, and mixed pine-oak forests. Pyrosejus n. gen. is described as the type genus of the family, based on material representing the type species, P. prionotus n. sp., and 8 un described species which are thought to represent 2 species groups. The species of this genus are differentiated from another un described species which represents another, undescribed, genus. The characteristics and placement of this family among others of the cohort Cercomegistina are discussed.RESUMEN: Se describe una nueva familia de ácaros mesostigmaticos, Pyrosejidae, basada en un grupo de 10 especies encontrado al sur de México, Centroamérica y al norte de Sudamérica. Los ácaros de este grupo se encuentran en la hojarasca de diversos tipos de bosque, entre los que se pueden incluir bosques tropicales lluviosos, bosques nublosos, y bosques mixtos de pinos y robles. Se describe Pyrosejus n. gen. como género tipo de la familia, basándose en material representativo de la especie tipo P. prionotus n. sp. y de 8 especies de este género no descritas, las cuales representan a 2 grupos de especies. Las especies de este género se diferencian de otra no descrita y representante a su vez de otro género no descrito. Se discuten las características y posición de esta familia dentro de otras de la cohorte Cercomegistina.RÉSUMÉ: Une famille nouvelle d'acariens mesostigmates trigynaspides, les Pyrosejidae, est décrite d'après dix espèces récoltées au sud du Mexique, en Amérique Centrale et au Nord de I'Amérique du Sud. On trouve ces acariens dans la litière de forêts de types variès, comprenant les forêtes tropicales humides, les forêts denses et les forêts mixtes pin-chêne. Le genre type de la famille, Pyrosejus n. gen., est décrit d'après le matériel de I'espèce type, P. prionotus n. sp., et de huit espèces non décrites que l'on croit représenter deux groupes d'espèces. Les espèces de ce genre se differencient d'une autre espèce non décrite représentant un autre genre non décrit. Les caractères et la place de cette famille au sein de la cohorte des Cercomegistina sont discutés

Coprozerconidae, a new family of zerconoid mites from North America (Acari: Mesostigmata: Zerconoidea)

RESUMEN: Se describe una nueva familia de acaros Mesostigmata, Coprozerconidae, basad a en material procedente de heces de la rata de bosque, Neotomafloridana magister Baird, de una cueva de Kentucky, E.U.A. Coprozercon gen. n. se describe como genero tipo de esta familia, basandose en el material que representa a la especie tipo, Coprozercon scopaeus sp. n. Se discuten las caracteristicas de esta familia con relaci6n alas demas de la cohorte Epicriina, incluyendo una discusi6n de Coprozerconidae como el "grupohermanado" de Zerconidae. Se traslada el genero Halozercon Wisniewski, Karg y Hirschmann, 1992, desde la familia podoespermica Halolaelapidae a la familia tocoespermica Zerconidae.SUMMARYA: new family of mesostigmatic mites, Coprozerconidae, is described on the basis of material collected from feces of the wood rat, Neotomafloridana magister Baird, in a cave in Kentucky, U.S.A. Coprozercon n. gen. is described as the type genus of the family, based on material representing the type species, Coprozercon scopaeus n. sp. The characteristics and relationships of this family among others of the cohort Epicriina are discussed, including a rationale for Coprozerconidae as the sister group of Zerconidae. The tocospermous genus Halozercon Wisniewski, Karg and Hirschmann, 1992, is transferred from the podospermous family Halolaelapidae to the tocospermous family Zerconidae

A search for resonances decaying into a Higgs boson and a new particle X in the XH → qqbb final state with the ATLAS detector

A search for heavy resonances decaying into a Higgs boson (H) and a new particle (X) is reported, utilizing 36.1 fb−1 of proton–proton collision data at collected during 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The particle X is assumed to decay to a pair of light quarks, and the fully hadronic final state is analysed. The search considers the regime of high XH resonance masses, where the X and H bosons are both highly Lorentz-boosted and are each reconstructed using a single jet with large radius parameter. A two-dimensional phase space of XH mass versus X mass is scanned for evidence of a signal, over a range of XH resonance mass values between 1 TeV and 4 TeV, and for X particles with masses from 50 GeV to 1000 GeV. All search results are consistent with the expectations for the background due to Standard Model processes, and 95% CL upper limits are set, as a function of XH and X masses, on the production cross-section of the resonance

Comparison between simulated and observed LHC beam backgrounds in the ATLAS experiment at Ebeam =4 TeV

Results of dedicated Monte Carlo simulations of beam-induced background (BIB) in the ATLAS experiment at the Large Hadron Collider (LHC) are presented and compared with data recorded in 2012. During normal physics operation this background arises mainly from scattering of the 4 TeV protons on residual gas in the beam pipe. Methods of reconstructing the BIB signals in the ATLAS detector, developed and implemented in the simulation chain based on the \textscFluka Monte Carlo simulation package, are described. The interaction rates are determined from the residual gas pressure distribution in the LHC ring in order to set an absolute scale on the predicted rates of BIB so that they can be compared quantitatively with data. Through these comparisons the origins of the BIB leading to different observables in the ATLAS detectors are analysed. The level of agreement between simulation results and BIB measurements by ATLAS in 2012 demonstrates that a good understanding of the origin of BIB has been reached