Molecular and morphological evidence suggests the reallocation from Parastrigea brasiliana (Szidat, 1928) Dubois, 1964 to Apharyngostrigea Ciurea, 1927 (Digenea: Strigeidae), a parasite of boat-billed heron (Cochlearius cochlearius) from the Neotropical region

2022 ◽  
Vol 86 ◽  
pp. 102468
Author(s):  
Alejandra López-Jiménez ◽  
Marcelo Tonatiuh González-García ◽  
Martín García-Varela
Keyword(s):  
Neotropical Region ◽  
Morphological Evidence

Morphology and DNA barcodes reveal the presence of the non-native land planarian Obama marmorata (Platyhelminthes : Geoplanidae) in Europe

2015 ◽  
Vol 29 (1) ◽  
pp. 12 ◽  
Author(s):  
Domingo Lago-Barcia ◽  
Fernando A. Fernández-Álvarez ◽  
Lisandro Negrete ◽  
Francisco Brusa ◽  
Cristina Damborenea ◽  
...  
Keyword(s):  
Dna Barcoding ◽  
Geographic Origin ◽  
Original Description ◽  
Neotropical Region ◽  
Morphological Evidence ◽  
Intraspecific Divergence ◽  
Interspecific Divergence ◽  
Allochthonous Species ◽  
First Time ◽  
Land Planarian

We report for the first time the occurrence of Obama marmorata in the Iberian Peninsula as an introduced species from the Neotropical Region. The species is also reported for the first time in Argentina. The identification was made on the basis of morphological evidence. The divergence levels of a fragment of the mitochondrial cytochromec oxidaseI gene from Argentinean and Iberian samples were studied. The morphology of samples from the two regions was the same and matched the original description of the species. A DNA barcoding matrix was constructed using new sequences from O. marmorata and sequences of related species taken from GenBank. Among the Geoplanidae, interspecific divergence ranged between 3.3 and 14.4%, while intraspecific divergence percentages were 0–1.2%, signalling the presence of a DNA barcoding gap. All O. marmorata sequences, irrespective of their geographic origin, form a well supported clade with an intraspecific divergence of 0–0.9 (average = 0.4%). These results indicate the utility of DNA barcoding to discover allochthonous species in this group of organisms.

Synonymy of the reduviid (Hemiptera: Heteroptera) genus Torrealbaia (Triatominae) with Amphibolus (Harpactorinae), with notes on Amphibolus venator (Klug, 1830)

Zootaxa ◽  
2004 ◽  
Vol 670 (1) ◽  
pp. 1 ◽  
Author(s):  
DIMITRI FORERO ◽  
CHRISTIANE WEIRAUCH ◽  
MANUEL BAENA
Keyword(s):  
Middle East ◽  
Neotropical Region ◽  
Northern Africa ◽  
Morphological Evidence ◽  
Stored Products

The monotypic reduviid genus Torrealbaia Carcavallo, Jurberg & Lent, 1998 (Triatominae, Cavernicolini) from Venezuela is synonymized with Amphibolus Klug, 1830 (Harpactorinae) described from Northern Africa. Morphological evidence for the synonymy of Torrealbaia martinezi Carcavallo, Jurberg & Lent, 1998 with Amphibolus venator (Klug, 1830) is discussed. The currently known distribution of A. venator (Northern Africa and the Middle East, Jamaica, India, Japan) is supplemented by new locality data from Venezuela, Canada and India. It is hypothesized that the distributional records of A. venator from the Neotropical region are due to dispersal of this species by human means, possibly with stored products.

Revision of Hymenophyllum subg. Sphaerocionium (Hymenophyllaceae) in the Atlantic Forest Domain (Brazil), Based on Molecular and Morphological Evidence

2020 ◽  
Vol 45 (4) ◽  
pp. 707-748
Author(s):  
Felipe Gonzatti ◽  
Paulo G. Windisch ◽  
Fernando J. Scariot ◽  
Sergio Echeverrigaray ◽  
Mara R. Ritter
Keyword(s):  
Tropical Forests ◽  
Atlantic Forest ◽  
Sequence Comparison ◽  
Conservation Status ◽  
Neotropical Region ◽  
Morphological Data ◽  
Morphological Evidence ◽  
Herbarium Specimens ◽  
Dichotomous Key ◽  
Data Field

Abstract—Sphaerocionium is the largest subgenus of Hymenophyllum and occurs mainly in tropical forests of the Neotropical Region. Species of Hymenophyllum occurring in Brazil are poorly known due to difficulties in species delimitation and the absence of detailed studies. The aim of the present study was to present a synopsis of Hymenophyllum subg. Sphaerocionium in the Atlantic Forest domain, based on molecular and morphological data. Field and herbarium specimens were morphologically analyzed by stereomicroscopy, optical microscopy, and scanning electron microscopy. Phylogenetic relationships were evaluated by sequence comparison of the plastidial regions trnG-R and rps4-trnS. Morphological and phylogenetic evidence led to the recognition of 14 taxa throughout the Atlantic Forest, five of which are endemic. The taxonomy and nomenclature of Hymenophyllum in Brazil are revised and 19 new lectotypifications are proposed. The conservation status and geographical distributions of all species are updated and a dichotomous key is provided.

Scanning and Transmission Electron Microscopy of Endomentrium in Women Wearing TCu-380-A IUD 's

1977 ◽  
Vol 35 ◽  
pp. 666-667
Author(s):  
A. Gonzalez Angulo ◽  
R. Berlioz ◽  
R. Aznar
Keyword(s):  
Copper Wire ◽  
Uterine Cavity ◽  
Morphological Evidence ◽  
Secretory Phase ◽  
Ultrastructural Studies ◽  
Proliferative Phase ◽  
Contraceptive Devices ◽  
Transmission Electron ◽  
Intrauterine Contraceptive ◽  
Myelin Figure

Recent ultrastructural studies on endometrial tissues from women wearing copper, wire intrauterine devices have disclosed morphological evidence of impaired glycogen degradation and secretion resulting in interference with the viability of blastocysts. Reduced microapocrine secretion observed with the scanning electron microscope supports this (1). In addition, organelle modifications have been observed in the epithelial cells of these women. The changes are seen in biopsies taken in the proliferative phase of the cycle and consist of mitochondrial vacuolation and myelin figure formation. These modifications disappear in the secretory phase and therefore have been regarded as reversible (2).The aim of the present studies was to investigate surface epithelial changes as well as organelle modifications in relation to the site of contact with an IUD that releases greater amounts of copper. Endometrial tissue was obtained from the uterine cavity of four young women wearing TCu-380-A intrauterine contraceptive devices for 4-6 weeks.

Ultrastructural Study of a differentiating human colon carcinoma cell line

1990 ◽  
Vol 48 (3) ◽  
pp. 208-209
Author(s):  
Sylvie Polak-Charcon ◽  
Mehrdad Hekmati ◽  
Yehuda Ben Shaul
Keyword(s):  
Cell Line ◽  
Morphological Changes ◽  
Secretory Granules ◽  
Human Colon ◽  
Cell Types ◽  
Culture Conditions ◽  
Morphological Evidence ◽  
Human Colon Carcinoma Cell ◽  
Colon Cell

The epithelium of normal human colon mucosa “in vivo” exhibits a gradual pattern of differentiation as undifferentiated stem cells from the base of the crypt of “lieberkuhn” rapidly divide, differentiate and migrate toward the free surface. The major differentiated cell type of the intestine observed are: absorptive cells displaying brush border, goblet cells containing mucous granules, Paneth and endocrine cells containing dense secretory granules. These different cell types are also found in the intestine of the 13-14 week old embryo.We present here morphological evidence showing that HT29, an adenocarcinoma of the human colon cell line, can differentiate into various cell types by changing the growth and culture conditions and mimic morphological changes found during development of the intestine in the human embryo.HT29 cells grown in tissue-culture dishes in DMEM and 10% FCS form at late confluence a multilayer of morphologically undifferentiated cell culture covered with irregular microvilli, and devoid of tight junctions (Figs 1-3).

Ultrastructural evidence of transplacental transport of immunoglobulin G in bitches

Reproduction ◽  
2000 ◽  
pp. 315-326 ◽  
Author(s):  
MH Stoffel ◽  
AE Friess ◽  
SH Hartmann
Keyword(s):  
Mammary Gland ◽  
Basement Membrane ◽  
Immunoglobulin G ◽  
Passive Immunity ◽  
Morphological Evidence ◽  
Membrane Material ◽  
Ultrastructural Evidence ◽  
Cytotrophoblast Cells ◽  
Fetal Vessels

In dogs, passive immunity is conferred to fetuses and neonates by the transfer of maternal immunoglobulin G through the placenta during the last trimester of pregnancy and via the mammary gland after parturition, respectively. However, morphological evidence of transplacental transport is still lacking. The aim of the present study was to localize maternal immunoglobulin G in the labyrinthine zone and in the haemophagous zone of the canine placenta by means of immunohistochemistry and immunocytochemistry. In the labyrinthine zone, immunoglobulin G was detected in all the layers of the materno-fetal barrier including the fetal capillaries. Immunoreactivity was particularly prominent in maternal basement membrane material as well as in the syncytiotrophoblast. However, this evidence of transplacental transport of immunoglobulin G originated from a limited number of unevenly distributed maternal vessels only. In the cytotrophoblast of the haemophagous zone, immunoglobulin G was localized to phagolysosomes at various stages but was never detected within fetal vessels. The results indicate that maternal immunoglobulin G is degraded in cytotrophoblast cells of the hemophagous zone and, therefore, that transplacental transport is restricted to a subpopulation of maternal vessels in the labyrinthine zone.

Diversification of the North American Doellingeria-Eucephalus Clade (Astereae: Asteraceae) Inferred from Molecular and Morphological Evidence

2019 ◽  
Vol 44 (4) ◽  
pp. 930-942
Author(s):  
Geraldine A. Allen ◽  
Luc Brouillet ◽  
John C. Semple ◽  
Heidi J. Guest ◽  
Robert Underhill
Keyword(s):  
North American ◽  
Sequence Data ◽  
Phylogenetic Analyses ◽  
Sister Group ◽  
Morphological Evidence ◽  
South American ◽  
New Combinations ◽  
The North ◽  
Hybridization Event ◽  
Ancient Hybridization

Abstract—Doellingeria and Eucephalus form the earliest-diverging clade of the North American Astereae lineage. Phylogenetic analyses of both nuclear and plastid sequence data show that the Doellingeria-Eucephalus clade consists of two main subclades that differ from current circumscriptions of the two genera. Doellingeria is the sister group to E. elegans, and the Doellingeria + E. elegans subclade in turn is sister to the subclade containing all remaining species of Eucephalus. In the plastid phylogeny, the two subclades are deeply divergent, a pattern that is consistent with an ancient hybridization event involving ancestral species of the Doellingeria-Eucephalus clade and an ancestral taxon of a related North American or South American group. Divergence of the two Doellingeria-Eucephalus subclades may have occurred in association with northward migration from South American ancestors. We combine these two genera under the older of the two names, Doellingeria, and propose 12 new combinations (10 species and two varieties) for all species of Eucephalus.

A new species of the subgenus Scheloribates (Topobates) (Acari: Oribatida: Scheloribatidae) from Panama

2020 ◽  
Vol 29 (2) ◽  
pp. 278-283
Author(s):  
S.G. Ermilov
Keyword(s):  
New Species ◽  
Body Size ◽  
Leaf Litter ◽  
Related Species ◽  
Large Body ◽  
Oribatid Mite ◽  
Neotropical Region ◽  
Large Body Size ◽  
First Time ◽  
A New Species

The oribatid mite subgenus Scheloribates (Topobates) Grandjean, 1958, is recorded from the Neotropical region for the first time. A new species of this subgenus is described from the leaf litter collected in Cayo Agua Island, Panama. Scheloribates (Topobates) panamaensis sp. nov. differs from its related species by the very large body size and presence of a strong ventrodistal process on the leg femora II–IV.

The External Morphology of the Eggs of Culex (Culex) saltanensis (Diptera: Culicidae) Under Scanning Electron Microscopy

2020 ◽  
Author(s):  
J R Santos-Mallet ◽  
T D Balthazar ◽  
A A Oliveira ◽  
W A Marques ◽  
A Q Bastos ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Optical Microscopy ◽  
Osmium Tetroxide ◽  
Neotropical Region ◽  
External Morphology ◽  
Metal Supports ◽  
Scanning Electron

Abstract The aim of the present study was to describe the morphology of the eggs of Culex (Culex) saltanensis Dyar that occurs in the Neotropical region. Eggs of the Cx. (Cux.) saltanensis were collected at the Mata Atlântica FIOCRUZ campus, fixed in 1% osmium tetroxide, prepared for mounting on metal supports, observed under a scanning electron microscope, and described morphologically. The eggs had a coniform shape with a length of approximately 0.5 mm (505–510 µm) and a width in the median portion of 117 µm (113–123 µm). Upper portion is lined with tubers of irregular shape and varying sizes (0.64–1.31 µm), located on a cross-linked matrix forming bands observed under optical microscopy. The micropyle is encased in a necklace of approximately 6.6-µm plates arranged in a flower-like shape. Comparing Cx. (Cux.) saltanensis eggs with several species of different genera, important divergent characteristics can be observed. However, this study points to the need for new descriptions of eggs of species belonging to the same subgenus in order to analyze if there will be differences between them. Culex (Cux.) saltanensis eggs have particular characteristics not observed in eggs of other Culicidae genera.

scholarly journals Morphological evolution of supermassive black hole merger hosts and multimessenger signatures

2021 ◽  
Vol 503 (3) ◽  
pp. 3629-3642
Author(s):  
Colin DeGraf ◽  
Debora Sijacki ◽  
Tiziana Di Matteo ◽  
Kelly Holley-Bockelmann ◽  
Greg Snyder ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Star Formation ◽  
Morphological Evolution ◽  
Full Range ◽  
High Mass ◽  
Morphological Evidence ◽  
Galaxy Mergers ◽  
Host Galaxies ◽  
Supermassive Black Hole

ABSTRACT With projects such as Laser Interferometer Space Antenna (LISA) and Pulsar Timing Arrays (PTAs) expected to detect gravitational waves from supermassive black hole mergers in the near future, it is key that we understand what we expect those detections to be, and maximize what we can learn from them. To address this, we study the mergers of supermassive black holes in the Illustris simulation, the overall rate of mergers, and the correlation between merging black holes and their host galaxies. We find these mergers occur in typical galaxies along the MBH−M* relation, and that between LISA and PTAs we expect to probe the full range of galaxy masses. As galaxy mergers can trigger star formation, we find that galaxies hosting low-mass black hole mergers tend to show a slight increase in star formation rates compared to a mass-matched sample. However, high-mass merger hosts have typical star formation rates, due to a combination of low gas fractions and powerful active galactic nucleus feedback. Although minor black hole mergers do not correlate with disturbed morphologies, major mergers (especially at high-masses) tend to show morphological evidence of recent galaxy mergers which survive for ∼500 Myr. This is on the same scale as the infall/hardening time of merging black holes, suggesting that electromagnetic follow-ups to gravitational wave signals may not be able to observe this correlation. We further find that incorporating a realistic time-scale delay for the black hole mergers could shift the merger distribution towards higher masses, decreasing the rate of LISA detections while increasing the rate of PTA detections.

Sign in / Sign up

Export Citation Format

Share Document