On the Affinities of the Cretaceous Lamellibranch Genera Trigonioides and Hoffetrigonia

1955 ◽  
Vol 92 (4) ◽  
pp. 345-349 ◽  
Author(s):  
L. R. Cox
Keyword(s):  
East Asian ◽  
New Family ◽  
New Material

AbstractThe East Asian Cretaceous lamellibranch genera Trigonioides and Hoffetrigonia are discussed after examining new material of the former, and the conclusion is reached that both belong to the Unionidae and not to the Trigoniidae. A proposal to include them in a new family is withdrawn.

The systematics of the south-east Asian genus Fangensis Rambla (Opiliones:Cyphophthalmi:Stylocellidae)

2005 ◽  
Vol 19 (4) ◽  
pp. 297 ◽  
Author(s):  
Peter J. Schwendinger ◽  
Gonzalo Giribet
Keyword(s):  
East Asian ◽  
Original Description ◽  
Distinct Species ◽  
Molecular Data ◽  
Ribosomal Genes ◽  
The Other ◽  
Morphological Data ◽  
Southern Thailand ◽  
New Material ◽  
Three New Species

The hitherto monotypic opilionid genus Fangensis Rambla, 1994 is re-evaluated from new material collected in northern, western and southern Thailand. The original description of F. leclerci Rambla (type material not traceable) was based on specimens belonging to at least three distinct species. Fangensis leclerci is thus redefined and the binomen restricted to specimens from a cave in northern Thailand only. Three new species are described, F. spelaeus, sp. nov. and F. cavernarus, sp. nov. from two caves in western Thailand and F. insulanus, sp. nov. from forests on two islands in southern Thailand. Taxonomic characters are discussed and relationships among Fangensis species and between Fangensis and other cyphophthalmids are evaluated using morphological data and ~4 Kb of molecular data from three loci, two nuclear ribosomal genes and a mitochondrial coding gene. Overall, data indicate monophyly of Stylocellidae and morphological and ribosomal data suggest monophyly of Fangensis, which is in turn divided into two clades, one composed of the three species from northern and western Thailand and the other represented by the species from southern Thailand. Observations on mating in F. leclerci are provided.

scholarly journals New insights into the earlier evolutionary history of epiphytic macrolichens

2021 ◽  
Author(s):  
Qiuxia Yang ◽  
Yanyan Wang ◽  
Robert Lucking ◽  
H. Thorsten Lumbsch ◽  
Xin Wang ◽  
...  
Keyword(s):  
Morphometric Analysis ◽  
Evolutionary History ◽  
Terrestrial Ecosystems ◽  
Molecular Dating ◽  
Geometric Morphometric ◽  
New Family ◽  
Family Level ◽  
History Of ◽  
New Material ◽  
Geometric Morphometric Analysis

Lichens are well known as pioneer organisms colonizing bare surfaces such as rocks and therefore have been hypothesized to play a role in the early formation of terrestrial ecosystems. Given the rarity of fossil evidence, our understanding of the evolutionary history of lichen-forming fungi is primarily based on molecular dating approaches. These studies suggest extant clades of macrolichens diversified after the K-Pg boundary. Here we corroborate the mid-Mesozoic fossil Daohugouthallus ciliiferus as an epiphytic macrolichen that predates the K-Pg boundary by 100 Mys. Based on new material and geometric morphometric analysis, we demonstrate that the Jurassic fossil is morphologically most similar to Parmeliaceae, but cannot be placed in Parmeliaceae or other similar family-level clades forming macrolichens as these evolved much later. Consequently, a new family, Daohugouthallaceae, is proposed here to accommodate this fossil, which reveals macrolichens may have been diverse long before the Cenozoic diversification of extant lineages.

scholarly journals A new family of harpacticoid copepods and an analysis of the phylogenetic relationships within the Laophontoidea T. Scott

1990 ◽  
Vol 60 (2) ◽  
pp. 79-120 ◽  
Author(s):  
Rony Huys
Keyword(s):  
Sexual Dimorphism ◽  
Spinous Process ◽  
Postembryonic Development ◽  
Single Male ◽  
New Family ◽  
Harpacticoid Copepods ◽  
Close Relationship ◽  
New Material ◽  
Mandibular Palp ◽  
Males And Females

A new family Cristacoxidae is proposed to accommodate the monotypic genera Cristacoxa gen. nov., Noodtorthopsyllus Lang (ex Canthocamptidae) and Cubanocleta Petkovski (ex Laophontidae). Cristacoxa petkovskii gen. et spec. nov. is described on the basis of a single male collected from coralline sand of Bonaire, West Indies. N. psammophilus Noodt and C. noodti Petkovski are redescribed and refigured on the basis of new material from the Galápagos (Isla Santa Cruz), the West Indian Islands (Curaçao, Klein Curaçao, Bonaire) and the Canary Islands (El Hierro, Tenerife). The new family is characterised by the presence of an outer spinous process on the first antennular segment, the absence of the antennary exopod, the uniramous mandibular palp, the presence of conspicuous cristae on the precoxa and coxa of leg 1 and the elongation of the apical exopodal spines of P2 to P4. The Cristacoxidae are unique in having an equal number of setae/spines onthe P5 in both sexes. Examination of the ontogeny of this leg in males and females of Orthopsyllus spec. gives strong evidence that the cristacoxid P5 has undergone neotenous evolution. Males of Cristacoxidae are readily recognisable by their extremely long spermatophores. The new family is allocated to the superfamily Laophontoidea T. Scott, together with the Laophontidae T. Scott, the Laophontopsidae Huys & Willems, the Orthopsyllidae Huys and the Adenopleurellidae Huys. A phylogenetic analysis of the relationships within the superfamily is presented, and as a result Por’s (1986) concept of the Laophontoidea is refuted. Instead, it is concluded that the superfamily can be defined on the basis of the following apomorphies: (1) antennules with outer spinous process on segment 2; (2) antenna with allobasis bearing 1 seta; (3) antennary exopod quadrisetose; (4) P1 exopod without inner seta on exp-2 and 4 setae/spines on exp-3; (5) P1 endopod 2-segmented with elongated enp-1 and 2 elements on enp-2; (6) P2—P4 with 2-segmented endopods; exp-1 without inner seta; (7) sexual dimorphism of P3 endopod; (8) P6 bisetose with one member fused to somite. There is no close relationship neither with the Normanellidae Lang, nor with the Ancorabolidae T. Scott. The Laophontidae are considered the first offshoot in the evolution of the Laophontoidea because of the retention of the 8-segmented antennule in both sexes and the ancestral seta formulae on P2–P4. The other families can be assigned to two clades: the Adenopleurellidaeand the Laophontopsidae-Cristacoxidae- Orthopsyllidae-grouping. The Laophontopsidae and the Cristacoxidae are sister groups because of the shared sexual dimorphism of the P3 endopod (advanced type), and the fusion of antennular segments distal to the geniculation in the male. Emphasis is placed on the postembryonic development in the Laophontoidea of the male P3 endopod and P6 and on their homologies in the female. A reconstruction of the hypothetical ancestor of the Laophontoideais presented.

scholarly journals High-entropy ceramics: Present status, challenges, and a look forward

2021 ◽  
Author(s):  
Huimin Xiang ◽  
Yan Xing ◽  
Fu-zhi Dai ◽  
Hongjie Wang ◽  
Lei Su ◽  
...  
Keyword(s):  
Inorganic Compounds ◽  
Rapid Development ◽  
Material Design ◽  
Future Directions ◽  
High Entropy ◽  
New Family ◽  
New Material ◽  
Novel Processing ◽  
Structure Engineering ◽  
Infant Stage

AbstractHigh-entropy ceramics (HECs) are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near-equal atomic ratios of multi-principal elements. Although in the infant stage, the emerging of this new family of materials has brought new opportunities for material design and property tailoring. Distinct from metals, the diversity in crystal structure and electronic structure of ceramics provides huge space for properties tuning through band structure engineering and phonon engineering. Aside from strengthening, hardening, and low thermal conductivity that have already been found in high-entropy alloys, new properties like colossal dielectric constant, super ionic conductivity, severe anisotropic thermal expansion coefficient, strong electromagnetic wave absorption, etc., have been discovered in HECs. As a response to the rapid development in this nascent field, this article gives a comprehensive review on the structure features, theoretical methods for stability and property prediction, processing routes, novel properties, and prospective applications of HECs. The challenges on processing, characterization, and property predictions are also emphasized. Finally, future directions for new material exploration, novel processing, fundamental understanding, in-depth characterization, and database assessments are given.

A systematic and phylogenetic revision of the family Elipsocidae (Insecta : Psocoptera), with the erection of two new families: Lesneiidae and Sabulopsocidae

2004 ◽  
Vol 18 (2) ◽  
pp. 157 ◽  
Author(s):  
T. R. New ◽  
E. R. Schmidt
Keyword(s):  
Phylogenetic Analysis ◽  
New Genera ◽  
Clear Definition ◽  
Generic Level ◽  
Incertae Sedis ◽  
New Family ◽  
The Family ◽  
New Material ◽  
Phylogenetic Revision ◽  
Generic Relationships

The phylogeny of the Elipsocidae is reappraised to aid understanding of generic relationships within the family, leading to its clear definition as a monophyletic entity and clarification of its position within the infraorder Homilopsocidea. Examination of new material and generic-level revision results in descriptions of ten new elipsocid genera: Prionotodrilus, gen. nov. for P. parvus (Smithers & Thornton), comb. nov. and P. serratus (Schmidt & Thornton), comb. nov.; Ausysium, gen. nov. for A. joyceorum, sp. nov.; Diademadrilus, gen. nov. for D. annulatus (Smithers), comb. nov., for which a description of the female is given, and D. masseyi (New), comb. nov.; Euryphallus, gen. nov. for E. badonneli (New & Thornton), comb. nov., E. cinqueportsae (Thornton & New), comb. nov., E. cooki (Thornton & New), comb. nov., E. defoei (Thornton & New), comb. nov., E. selkirki (Thornton & New), comb. nov., E. skottsbergi (Thornton & New), comb. nov. and E. stigmaticus (Tillyard), comb. nov.; Gondwanapsocus, gen. nov. for G. australis, sp. nov.; Onychophallus, gen. nov. for O. diemenensis, sp. nov.; Psocophloea, gen. nov. for P. sarahae, sp. nov.; Telmopsocus, gen. nov. for T. waldheimensis, sp. nov.; Villopsocus, gen. nov. for V. tasmaniensis, sp. nov., and Weddellopsocus, gen. nov. for W. avius (Smithers), comb. nov., W. carrilloi (Thornton & Lyall), comb. nov., W. flavus (Thornton & Lyall), comb. nov., W. griseus (New & Thornton), comb. nov. and W. valdiviensis (Blanchard), comb. nov. A rediagnosis of Spilopsocus is given, the male of Sabulopsocus tractuosus Smithers is described and Nepiomorpha phragmitella Smithers is transferred to Clinopsocus New. We provide a phylogenetic analysis to assess the monophyly of Elipsocidae. Sixty-one characters are scored for 38 taxa, including the putative new genera and four outgroups. Monophyly of Elipsocidae is supported with the exclusion of four genera: Palmicola Mockford is transferred to Mesopsocidae; Sabulopsocus Smithers and Moapsocus, gen.�nov. for M. angelicus, sp. nov. are placed in the new family Sabulopsocidae; and Drymopsocus Smithers, which is the sister-taxon to Elipsocidae, is incertae sedis. Other taxa previously regarded as elipsocids are reassigned: Elipsocus impressus (Hagen), Elipsocus modestus Banks and Elipsocus boops (Hagen) are redescribed and respectively placed in Valenzuela Navás (Caeciliusidae), Dasydemella Enderlein (Dasydemellidae) and Mesopsocus Kolbe (Mesopsocidae). Lesneia Badonnel is placed in the new family Lesneiidae. The position of Eolachesilla Badonnel is discussed briefly. A key to genera and comment on characters diagnosing the family Elipsocidae is presented. We retain two subfamilies and discuss the merits of our proposed higher classification. A brief biogeographical interpretation suggests that the family has a southern origin and may be as old as the Mesozoic.

Maxims of Foreign Policy

Itinerario ◽  
2000 ◽  
Vol 24 (2) ◽  
pp. 62-79
Author(s):  
W.J. Boot
Keyword(s):  
Foreign Policy ◽  
Sixteenth Century ◽  
Foreign Relations ◽  
East Asian ◽  
Modern Period ◽  
Cultural Sphere ◽  
Japanese Identity

In the pre-modern period, Japanese identity was articulated in contrast with China. It was, however, articulated in reference to criteria that were commonly accepted in the whole East-Asian cultural sphere; criteria, therefore, that were Chinese in origin.One of the fields in which Japan's conception of a Japanese identity was enacted was that of foreign relations, i.e. of Japan's relations with China, the various kingdoms in Korea, and from the second half of the sixteenth century onwards, with the Portuguese, Spaniards, Dutchmen, and the Kingdom of the Ryūkū.

Microstructure and crystal symmetry of Pb2Sr2(Y/Ca)Cu3O9−δ

1990 ◽  
Vol 48 (4) ◽  
pp. 64-65
Author(s):  
Y. P. Lin ◽  
J. S. Xue ◽  
J. E. Greedan
Keyword(s):  
Electron Diffraction ◽  
High Temperature Superconductors ◽  
Carbon Film ◽  
Basic Structure ◽  
Crystal Symmetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Space Groups ◽  
New Family ◽  
Convergent Beam

A new family of high temperature superconductors based on Pb2Sr2YCu3O9−δ has recently been reported. One method of improving Tc has been to replace Y partially with Ca. Although the basic structure of this type of superconductors is known, the detailed structure is still unclear, and various space groups has been proposed. In our work, crystals of Pb2Sr2YCu3O9−δ with dimensions up to 1 × 1 × 0.25.mm and with Tc of 84 K have been grown and their superconducting properties described. The defects and crystal symmetry have been investigated using electron microscopy performed on crushed crystals supported on a holey carbon film.Electron diffraction confirmed x-ray diffraction results which showed that the crystals are primitive orthorhombic with a=0.5383, b=0.5423 and c=1.5765 nm. Convergent Beam Electron Diffraction (CBED) patterns for the and axes are shown in Figs. 1 and 2 respectively.

A new family of fluorescent calcium indicators designed to resist leakage or for measuring calcium near membranes

1994 ◽  
Vol 52 ◽  
pp. 168-169
Author(s):  
Martin Poenie ◽  
Akwasi Minta ◽  
Charles Vorndran
Keyword(s):  
Metal Binding ◽  
Acetoxymethyl Ester ◽  
Binding Properties ◽  
Fura 2 ◽  
New Family ◽  
Anion Transporter ◽  
Calcium Indicator ◽  
Calcium Indicators ◽  
High Calcium ◽  
Intracellular Compartmentalization

The use of fura-2 as an intracellular calcium indicator is complicated by problems of rapid dye leakage and intracellular compartmentalization which is due to a probenecid sensitive anion transporter. In addition there is increasing evidence for localized microdomains of high calcium signals which may not be faithfully reported by fura-2.We have developed a new family of fura-2 analogs aimed at addressing some of these problems. These new indicators are based on a modified bapta which can be readily derivatized to produce fura-2 analogs with a variety of new properties. The modifications do not affect the chromophore and have little impact on the spectral and metal binding properties of the indicator. One of these new derivatives known as FPE3 is a zwitterionic analog of fura-2 that can be loaded into cells as an acetoxymethyl ester and whose retention in cells is much improved. The improved retention of FPE3 is important for both cuvettebased measurements of cell suspensions and for calcium imaging.

Scanning tunneling microscopy and atomic force microscopy: New tools for biology

1989 ◽  
Vol 47 ◽  
pp. 778-779
Author(s):  
CE Bracker ◽  
P. K. Hansma
Keyword(s):  
Physical Property ◽  
Scanning Probe ◽  
Scanning Tunneling ◽  
Small Scale ◽  
Tunneling Microscopy ◽  
Force Microscopy ◽  
New Family ◽  
Small Probe ◽  
Atomic Force ◽  
Transmission Electron

A new family of scanning probe microscopes has emerged that is opening new horizons for investigating the fine structure of matter. The earliest and best known of these instruments is the scanning tunneling microscope (STM). First published in 1982, the STM earned the 1986 Nobel Prize in Physics for two of its inventors, G. Binnig and H. Rohrer. They shared the prize with E. Ruska for his work that had led to the development of the transmission electron microscope half a century earlier. It seems appropriate that the award embodied this particular blend of the old and the new because it demonstrated to the world a long overdue respect for the enormous contributions electron microscopy has made to the understanding of matter, and at the same time it signalled the dawn of a new age in microscopy. What we are seeing is a revolution in microscopy and a redefinition of the concept of a microscope.Several kinds of scanning probe microscopes now exist, and the number is increasing. What they share in common is a small probe that is scanned over the surface of a specimen and measures a physical property on a very small scale, at or near the surface. Scanning probes can measure temperature, magnetic fields, tunneling currents, voltage, force, and ion currents, among others.

Characterization of a monolayer graphitic structure

1994 ◽  
Vol 52 ◽  
pp. 760-761
Author(s):  
X. Lin ◽  
X. K. Wang ◽  
V. P. Dravid ◽  
J. B. Ketterson ◽  
R. P. H. Chang
Keyword(s):  
Three Dimensional ◽  
Single Layer ◽  
Synthesis Process ◽  
Graphitic Structure ◽  
Positive Gaussian Curvature ◽  
Graphitic Sheet ◽  
Structural And Electronic Properties ◽  
New Material ◽  
Hexagonal Network

For small curvatures of a graphitic sheet, carbon atoms can maintain their preferred sp2 bonding while allowing the sheet to have various three-dimensional geometries, which may have exotic structural and electronic properties. In addition the fivefold rings will lead to a positive Gaussian curvature in the hexagonal network, and the sevenfold rings cause a negative one. By combining these sevenfold and fivefold rings with sixfold rings, it is possible to construct complicated carbon sp2 networks. Because it is much easier to introduce pentagons and heptagons into the single-layer hexagonal network than into the multilayer network, the complicated morphologies would be more common in the single-layer graphite structures. In this contribution, we report the observation and characterization of a new material of monolayer graphitic structure by electron diffraction, HREM, EELS.The synthesis process used in this study is reported early. We utilized a composite anode of graphite and copper for arc evaporation in helium.

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