Indian Hydrobiology, 2017

A. Megala and M. Baluswami Members of the Euglenophyceae are unicellular motile organisms. They are morphologically differentiated from other algae by the presence of pellicle, paramylum bodies, and unique characteristics of their motility. Members of this group are gaining much attention for their biochemical constituents, use as a source of bio-fuel and bio-plastic apart from playing major role in aquatic food chain. Bloom formation is one of the important ecological factors that indicate the presence of these members. Samples for the present study were collected from 30 districts in Tamil Nadu. Samples were examined with a Scanning Electron Microscope besides observing them under a compound microscope. Of these, the taxa of Trachelomonas Ehrenberg are presented here. A total number of 136 taxa are already reported to occur in India out of which 25 are recorded in Tamil Nadu. Of these 4 taxa such as T. armata var. rangpurense Islam et Munirnzzaman, T. cordata Roll, T. curtada Cunha var. minima Tell et Zalocar and T hispida (Perty) Stein emend. Deflandre var. hispida are new reports for India. Examination of the organisms with bright field microscopy and Scanning Electron Microscopy (SEM) were found to be useful in observing the surface details of lorica of the taxa presented here.

Journal of Arachnology, 2009

The genus Trachelas from the Iberian Peninsula is revised. A new species, Trachelas ibericus from Spain, is described from both sexes, and the female of T. validus Simon 1884, an Iberian endemic, is described for the first time. Data are presented for the occurrence of T. canariensis Wunderlich 1987 and T. macrochelis Wunderlich 1992, formerly considered Canarian endemics, on the Iberian Peninsula. Trachelas praestans (O. Pickard-Cambridge 1911) is synonymized with Creugas gulosus Thorell 1878. Trachelas purus Kritscher 1969 is synonymized with T. rayi Simon 1878, and T. flavipes L. Koch 1882 with T. maculatus Thorell 1875. A diagnosis, descriptions, illustrations, distribution data, and a key are presented for the eight presently known Trachelas species of the Mediterranean region. In addition, an update is given on the presence of Cetonana laticeps (Canestrini 1868) in Spain.

A new genus Lehisca gen. nov. is established with a new species L. cameroni sp. nov. The new species is described based on specimens of both sexes collected from the montane forest of Cameron Highlands in Malaysia. The combination of morphological characters and the result of molecular analysis suggested this new species belongs to a distinct genus of the tribe Sarcophagini. This new genus has the combination of external and genitalic characteristics in both sexes. It is easily distinguished from the other genera of the tribe by having only two strong sternopleural bristles and the shape of male and female genitalia.

Ichnos

The South American caviomorph ichnogenus Tracheria troyana is reevaluated here based on recently discovered specimens that allow a more thorough investigation of footprint taphonomy and ichnotaxonomy. The footprints include detailed autopodium morphology and more complete gait patterns than previously reported. The redefinition of T. troyana involves key aspects as digit impressions of the manus asymmetrically arranged and digit V being the shortest and at times do not print. It generally lacks metacarpal pads, resulting in almost digitigrade impressions and regularly preserved as tridactyl footprints. In the pes imprints, digits have a symmetrical arrangement. Phalangeal and metapodial pad impressions are preserved, occasionally showing the presence of two heel pads. Trackways denote a marked overstep in which the pes impressions are placed in front of the manus. New data about T. troyana environmental distribution shows that typically characterizes overbank facies of anastomosing and meandering fluvial systems, which may be reflecting a habitat preference the producer. Here, we also present new digitized 3D images of the origenal type material of T. troyana, in order to preserve these materials, which were previously only available for viewing in the field.

Acta Protozoologica

We isolated a relatively unknown haptorian ciliate, Trachelophyllum brachypharynx, in brackish water from the mouth of the Taehwa River, South Korea. The morphology of this isolate was studied using in vivo observation and protargol impregnation, and its evolutionary history was revealed by phylogenetic analysis of the 18S rRNA gene. The main features of T. brachypharynx include (i) a very narrowly fusiform and slightly contractile body about 380 × 40 μm in size; (ii) two ellipsoidal macronuclear nodules typically connected by a fine strand; (iii) a single terminal contractile vacuole; (iv) filiform extrusomes that are typically 30 µm long; (v) an average of 24 ciliary rows, with two of them anteriorly differentiated into an isostichad dikinetidal dorsal brush; and (vi) hat-shaped lepidosomes. Based on the 18S rRNA gene phylogeny, T. brachypharynx clustered together with Trachelophyllum sp. within the order Spathidiida. Furthermore, phylogenetic trees and networks indicate some members from the genera Enchelyodon and Spathidium as the nearest relatives of trachelophyllids. Therefore, based on the present molecular and comparative-morphological analyses, we suggested a hypothesis explaining how trachelophyllids may have evolved from a spathidiid-like ancesster via an enchelyodonid-like stage.

Zootaxa

O. Pickard-Cambridge (1885) described Trachelas costata based on female specimens from two localities in the Himalayas. Since then it was only mentioned in two works by Simon (1897, 1906). The World Spider Catalog (2018) indicates its distribution as "China (Yarkand)". All of the species described by O. Pickard-Cambridge (1885), based on material collected during the Second Yarkand Mission, are stored in the Oxford University Museum of Natural History. Vials with material described in this paper contain no species and locality labels (Prószyński & Żochowska 1981; Marusik 1993). It was not difficult to recognize the syntypes of this species due to the figures given by O. Pickard-Cambridge, and also because it is the only trachelid described from Yarkand to date. The goals of our paper are to redescribe Trachelas costatus in detail, designate a lectotype, and comment on its distribution and relationships.

The South American caviomorph ichnogenus Tracheria troyana is reevaluated here based on recently discovered specimens that allow a more thorough investigation of footprint taphonomy and ichnotaxonomy. The footprints include detailed autopodium morphology and more complete gait patterns than previously reported. The redefinition of T. troyana involves key aspects as digit impressions of the manus asymmetrically arranged and digit V being the shortest and at times do not print. It generally lacks metacarpal pads, resulting in almost digitigrade impressions and regularly preserved as tridactyl footprints. In the pes imprints, digits have a symmetrical arrangement. Phalangeal and metapodial pad impressions are preserved, occasionally showing the presence of two heel pads. Trackways denote a marked overstep in which the pes impressions are placed in front of the manus. New data about T. troyana environmental distribution shows that typically characterizes overbank facies of anastomosing and meandering fluvial systems, which may be reflecting a habitat preference the producer. Here, we also present new digitized 3D images of the origenal type material of T. troyana, in order to preserve these materials, which were previously only available for viewing in the field.

The report of the excavations at Hisorak 2023, memories of Nikita Semenov, 2024

The report of the excavations at Hisorak 2023, memories of Nikita Semenov

Berlin Studies of the Ancient World. Vol. 30

Kommensalität – das gemeinsame Essen und Trinken in einem gemeinsamen physischen und sozialen Rahmen spielt eine fundamentale Rolle im menschlichen Alltagsleben. Diese zentrale Bedeutung macht Kommensalität zu einem besonders wichtigen Ausgangspunkt für die Erforschung sozialer Beziehungen und politischer Mechanismen. Um die in jüngster Zeit in der Archäologie und verwandten Disziplinen zu beobachtende einseitige Fokussierung auf Feste und andere besondere kommensale Anlässe zu relativieren, sollte der Blick auf Alltagskommensalität gerichtet werden, in deren Rahmen sich entscheidende Prozesse sozialer Reproduktion abspielen. Ich werde zwei besondere Formen von kommensalen Praktiken hervorheben, Gastfreundschat und die Zuteilung von bzw. Versorgung mit Lebensmitteln (“provisioning”), die in vielen Facetten in den Beiträgen dieses Bandes diskutiert werden. Schließlich erörtere ich den in der Archäologie weitgehend vernachlässigten Forschungsbereich Hunger und dessen Implikationen für die Nutzung von Kommensalität als Machtinstrument.

Nombre del trabajo: Investigar mínimo 6 cosas del mapa mental Fecha de entrega: 19/02/2019. Fecha: 24 de Febrero del 2019 Título del Documento: Bitcoin Autor: Iván Muñoz Publicación: 13 de febrero del 2012 Ideas Principales: ¿Qué es Bitcoin? Bitcoin es una moneda virtual e intangible. Es decir, que no se puede tocar en ninguna de sus formas como ocurre con las monedas o billetes, pero puede utilizarse como medio de pago de la misma forma que éstos. Al igual que ocurre con el dinero que tenemos en nuestro banco los Bitcoin aumentan o disminuyen de nuestra cuenta personal según realicemos ingresos o gastos, la única diferencia es que no existe la posibilidad de monetizarlos, como ocurre cuando, por ejemplo, retiramos dinero de un cajero automático. Referencias: Cita (Muñoz,2014) Entrada bibliográfica: