scholarly journals A new diatom (Bacillariophyceae) species from a thermal spring in Azores archipelago (São Miguel island, Atlantic Ocean)

2020 ◽  
Vol 99 (1) ◽  
pp. 169-181
Author(s):  
Cristina Delgado ◽  
Vitor Gonçalves ◽  
Saúl Blanco ◽  
Salomé F.P. Almeida
Keyword(s):  
Atlantic Ocean ◽  
Northern Hemisphere ◽  
Thermal Spring ◽  
The Other ◽  
Thermal Springs ◽  
New Taxon ◽  
Diatom Species ◽  
Azores Archipelago ◽  
The One ◽  
Scanning Electron

Background: Due to their isolation, islands offer excellent areas for the study of distribution of benthic diatoms. On the other hand, diatoms bearing canal raphe have received less attention compared to other groups of diatoms such as Navicula, Pinnularia or Amphora. Questions: Is it possible that thermal springs on islands offer a refuge for infrequent diatom species? Studied species: Platichthys furnensis C. Delgado, V. Gonçalves & S.F.P. Almeida sp. nov. Study site and dates: The species here described was collected in the epilithon of a thermal spring in São Miguel Island (Azores Archipelago, Portugal) in September 2015. Methods: This new taxon was compared to other diatom species of the genera Nitzschia, Tryblionella, Entomoneis and Hantzschia and to the other species of the genus Platichthys. The morphology is documented by light and scanning electron images and discussed in detail. Results: Platichthys furnensis was found in a thermal pool, a similar habitat to the one where P. krammeri type was collected in Chile in 1940. P. furnensis has many structures that are characteristic of the recently described genus Platichthys, including raised canal raphe and fibulae, compressed valve face, steep valve face and numerous open copulae. Conclusions: The description of the new taxon is interesting because it is the first species within Platichthys to be described from the Northern Hemisphere.

scholarly journals Beyond the Nature-Culture Frontier

2022 ◽  
Vol 3 (1) ◽  
pp. 151-176
Author(s):  
Juana De Oliveira Santos ◽  
María Elena Martínez-Torres ◽  
Maristela Oliveira de Andrade
Keyword(s):  
Atlantic Ocean ◽  
Environmental Protection ◽  
Mediterranean Sea ◽  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Sea Urchin ◽  
The Other ◽  
Ethnographic Research ◽  
Artisanal Fishing ◽  
The One

In order to challenge the culture–nature dichotomy, this article investigates two festivities centered around fishing and consuming the sea urchin in two different locations: the Suape Bay Ouriçada (Brazil) in the Southern Hemisphere, and the Carry-le-Rouet Oursinade (France) in the Northern Hemisphere. This study employs both bibliographic and ethnographic research carried out at the two festivals over the last six years. The communities that originated these sea urchin festivals are both historically connected to artisanal fishing traditions that aim at creating bonds of sociability and connection with nature. While these festivities feature a wide variety of “things,” the one that stands out is the sea urchin itself. During these festivals, this species is taken by human hands from their habitat on the bottom of the Atlantic Ocean or the Mediterranean Sea to become the main reason for celebration and sociability in two different communities. On the one hand, sea urchin festivals can be seen as the heritage of local immaterial culture and as a symbol of the struggle for environmental protection. On the other hand, they are both the victim and the perpetrator of environmental degradations that threaten the event’s survival. Although the communities in these two geographic locations devised very different celebratory rituals around the same marine creature, by comparing and contrasting the two festivities we can contend that, despite their specificities, these sea urchin festivals challenge the culture–nature dichotomy. In other words, it is precisely through food that the natural and cultural worlds can become one.

scholarly journals Pinnularia baeticasp. nov. (Bacillarophyceae): a new diatom species found in an alkaline mountain lagoon in the south of Europe (Granada, Spain)

2018 ◽  
Author(s):  
David Fernádez-Moreno ◽  
Ana T. Luís ◽  
Pedro M. Sánchezcastillo
Keyword(s):  
Electron Microscopy ◽  
Morphological Characters ◽  
The Other ◽  
Diatom Species ◽  
The North ◽  
The One ◽  
A New Species ◽  
South Of Europe ◽  
Scanning Electron ◽  
Freshwater Diatom

AbstractA new benthic freshwater diatom species belonging to the genusPinnulariawas found in Laguna Seca of Sierra Seca in the north of the province of Granada, Spain.Pinnularia baeticasp.nov. is proposed as a new species based on observations under light (LM) and scanning electron microscopy (SEM) and its special ecology typical of a calcareous lagoon. The most similar taxa toP. baeticaisP. atlasiiand with more differencesP. infirmaand the last two were studied through material obtained in lagoons of northern Morocco. Although there are similarities in the morphological characters of the frustule, it was possible to verify through LM and SEM micrographs, evident differences between P. baetica and the other two taxa; on the one end,P. baeticahas a panduriform shape more pronounced thanP. infirmaand bigger size. On the other hand, the absence of spines inP. baeticaand the more convergent striation at the poles are the main differences with P. atlasi.Phylum Ochrophyta Caval.-Sm. (Cavalier-Smith 1995)Class Bacillariophyceae Haeckel emend. Medlin & Kaczmarska (Medlin & Kaczmarska 2004)SubclassBacillariophycidaeRound (Round et al. 1990)OrderNaviculales(Bessey 1907 sensu emend)Family Pinnulariaceae D.G. Mann, 1990, GenusPinnulariaC.G. Ehrenberg, 1843Pinnularia baeticaFernández Moreno & Sánchez Castillo sp. nov

Angusticopula rowlingiana, a new melosiroid diatom (Bacillariophyta) from Ascension Island (South Atlantic Ocean)

Phytotaxa ◽  
2019 ◽  
Vol 388 (2) ◽  
pp. 155 ◽  
Author(s):  
BART VAN DE VIJVER ◽  
SANDRA WILFERT ◽  
VACLAV HOUK ◽  
DAVID M. JOHN
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Atlantic Ocean ◽  
Diatom Species ◽  
Ascension Island ◽  
Remote Island ◽  
A New Species ◽  
Similar Combination ◽  
Southern Atlantic Ocean ◽  
Scanning Electron

During a diatom survey of some samples from Ascension Island, a remote island located in the southern Atlantic Ocean, an unknown melosiroid diatom species was studied using both light and scanning electron microscopy. It proved to be a new species described as Angusticopula rowlingiana sp. nov. and characterized by a large number of narrow copulae in the girdle, a marginal ring of small granules, very small pores covering the entire valve face and occasionally having internal valves.                The new species is compared with all Angusticopula species known worldwide and with several Melosira species showing a similar combination of characters. Short notes on its ecology are included.

Cocconeis kurakakea, a new diatom species from Nukutavake (Tuamotu Archipelago, South Pacific): description and comparison with C. diruptoides and C. pseudodiruptoides

Phytotaxa ◽  
2018 ◽  
Vol 349 (2) ◽  
pp. 115 ◽  
Author(s):  
CATHERINE RIAUX-GOBIN ◽  
ANDRZEJ WITKOWSKI ◽  
RICHARD W. JORDAN ◽  
VALERIANO PARRAVICINI ◽  
SERGE PLANES
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
South Pacific ◽  
Benthic Diatom ◽  
New Taxon ◽  
Diatom Species ◽  
The South ◽  
Standard Methods ◽  
Tuamotu Archipelago ◽  
Scanning Electron

During the ‘Tara Pacific 2016–2018 Expedition’, marine benthic diatom samples were collected from several Tuamotu atolls in the South Pacific. Preparation and examination of these samples were conducted following standard methods including light and scanning electron microscopy. A small-celled taxon from the genus Cocconeis Ehrenb. (Bacillariophyceae) is described from the Nukutavake reef, and compared to several other taxa for which the definition is not always clear (e.g., Cocconeis diruptoides Hust. and Cocconeis pseudodiruptoides Foged). The new taxon is present only on one of the investigated Tuamotu atolls, possibly indicating local endemism.

scholarly journals Distrionella coxiana, a new fragilarioid diatom species (Bacillariophyceae) from Tierra del Fuego, Patagonia, Argentina

2019 ◽  
Vol 152 (2) ◽  
pp. 385-391
Author(s):  
Valeria Casa ◽  
Gabriela Mataloni ◽  
Bart Van de Vijver
Keyword(s):  
Typical Feature ◽  
Morphological Features ◽  
Tierra Del Fuego ◽  
New Taxon ◽  
Diatom Species ◽  
Unique Combination ◽  
Diatom Flora ◽  
Electron Microscopical ◽  
Scanning Electron ◽  
Freshwater Diatom

Background and aims – A few years ago, a new survey started of the freshwater diatom flora from peatbogs of Tierra del Fuego (southern Argentina). During this survey, an unknown fragilarioid diatom belonging to the genus Distrionella that could not be identified using the currently available literature was discovered. Methods – Using both Light Microscopical and Scanning Electron Microscopical techniques, the morphology of the unknown Distrionella species has been analysed. The new taxon is properly described, illustrated and compared with all other possible similar Distrionella taxa, known worldwide. Key results – Distrionella coxiana possesses a unique combination of morphological features that excludes conspecificity with all other members of the genus; it is characterized in having narrow, linear valves with small, capitate apices. Transapical ribs, a typical feature of the genus Distrionella, are only weakly developed. One rimoportula is observed close to the apices. Both apices have well-developed apical porefields. The girdle bands bear one complete row of poroids often accompanied by a second, incomplete row of small poroids. Notes on the occurrence and ecology of the new taxon are added.

A new isopod species from the abyssal South Pacific ocean: Eugerda gigantea sp. nov. (Isopoda: Asellota: Desmosomatidae)

1999 ◽  
Vol 79 (6) ◽  
pp. 1061-1067 ◽  
Author(s):  
Ja-Yang Park
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
Atlantic Ocean ◽  
Northern Hemisphere ◽  
South Pacific ◽  
First Record ◽  
The Other ◽  
Equatorial Atlantic ◽  
South Pacific Ocean ◽  
Equatorial Atlantic Ocean

The new species Eugerda gigantea sp. nov. is described from the abyssal of the equatorial eastern South Pacific. For the genus Eugerda this is the first record from the South Pacific ocean, the other known species of the genus occur in the northern hemisphere or the equatorial Atlantic ocean.

Behavior of Cr-Rich Phase during Rapid Solidification Cu71Cr29 Alloys

2011 ◽  
Vol 228-229 ◽  
pp. 101-105
Author(s):  
Zhi Ming Zhou ◽  
Li Wen Tang ◽  
Jing Luo ◽  
Tao Zhou ◽  
Jie Zhan ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
The Other ◽  
Solidification Behavior ◽  
Rich Phase ◽  
Splat Quenching ◽  
The One ◽  
Average Size ◽  
Scanning Electron

Behavior of Cr-rich phase in rapid solidification Cu71Cr29 alloys was investigated by using melt spinning and splat quenching. The microstructure and solidification behavior of the Cr-rich were investigated by scanning electron microscopy (SEM). The results showed that the alloys generally have a microstructure consisting of a fine dispersion of a Cr-rich phase in a Cu-rich matrix. However, the morphology and size of the Cr-rich phase vary greatly with the cooling rate. On the one hand, the average size of the Cr-rich phase is reduced with increasing cooling rate. On the other hand, the Cr-rich phase show both dendrites and spheroids for lower cooling rate but only spheroids for the higher cooling rate. This means liquid phase separation occurred during rapid solidification. The results were discussed with respect to the formation of the Cr-rich spheroids during rapid solidification.

Pinnularia baetica sp. nov. (Bacillarophyceae): Comparison with other panduriform species in the Mediterranean area

Phytotaxa ◽  
2020 ◽  
Vol 435 (2) ◽  
pp. 85-100
Author(s):  
DAVID FERNÁNDEZ MORENO ◽  
ANA T. LUÍS ◽  
DANIJELA VIDAKOVIC ◽  
ZLATKO LEVKOV ◽  
PEDRO M. SÁNCHEZ CASTILLO
Keyword(s):  
Electron Microscopy ◽  
Mediterranean Area ◽  
Morphological Characters ◽  
The Other ◽  
Diatom Species ◽  
Valve Size ◽  
The Mediterranean ◽  
Locus Classicus ◽  
Scanning Electron ◽  
Freshwater Diatom

A new freshwater diatom species Pinnularia baetica sp. nov. is described from two different ponds from the Mediterranean area: Andalucia (South of Spain) and Lake Livadičko, Serbia. The species is described by observations under light (LM) and scanning electron microscopy (SEM). The most similar taxa to P. baetica are P. atlasii and P. infirma that were studied through material obtained in lagoons of northern Morocco (locus classicus of P. atlasi). Although there are similarities in the morphological characters of the frustule, it was possible to verify both through LM and SEM observations, clear differences between P. baetica and the latter two taxa: Pinnularia baetica has a panduriform shape more pronounced than P. infirma and larger valve size. On the other hand, the absence of spines in P. baetica, the more convergent striation at the poles and a slightly wider valve are the main differences with P. atlasi. This paper documents the distribution areas of P. baetica in calcareous systems of oligotrophic mid-mountain ponds of Spain and Serbia.

scholarly journals A new marine varanoid from the Cenomanian of the Middle East

2005 ◽  
Vol 84 (3) ◽  
pp. 247-255 ◽  
Author(s):  
A. Haber ◽  
M.J. Polcyn
Keyword(s):  
Middle East ◽  
The Other ◽  
New Taxon ◽  
Question Mark ◽  
The One ◽  
Nasal Capsule

AbstractWe describe a new marine varanoid, Judeasaurus tchernovi gen. et sp. nov., on the basis of a partial skull recovered from the Middle Cenomanian of the Judean Hills. The new taxon possesses a unique suite of characters exhibited in terrestrial varanoid lizards on the one hand and derived mosasauroids on the other. The characters that relate it to terrestrial varanoid lizards include broad premaxilla, anteriorly depressed maxillae underlying the nasal capsule, extensive postorbitofrontal-parietal contact and vertically oriented parietal rami. Derived mosasauroid characters include a question-mark shaped quadrate, fused frontals, intricate fronto-parietal suture and moderately retracted nares. The shape of the supratemporal and its syndesmotic articulation with the parietal distinguishes the new taxon from any other known specimen. The dentition exhibits elongate and narrow cylindrical roots lacking resorption pits, a condition reminiscent of Coniasaurus, but crowns are small, slightly recurved and conical. Taken together, the new taxon possesses a suite of characters suggesting dolichosaurid affinities.

scholarly journals Diagnose et écologie de quelques microalgues de la lagune Vodroboué et son embouchure

2019 ◽  
Vol 42.2 ◽  
pp. 7226-7236
Author(s):  
ADON Marie Paulette ◽  
SALLA Moreto ◽  
KONAN Estelle Sévérine ◽  
KOMOÉ Koffi ◽  
OUATTARA Allassane ◽  
...  
Keyword(s):  
Ivory Coast ◽  
Physicochemical Parameters ◽  
Temperature Tolerance ◽  
The Other ◽  
Alkaline Ph ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
The One ◽  
First Time ◽  
Scanning Electron

La description succincte et l’écologie d’un taxon de Dinophyta et de quelques taxons de Chrysophyta ont été réalisées à partir du microscope électronique à balayage (MEB) et des paramètres physico-chimiques. Les mesures des paramètres physico-chimiques (Température, pH, conductivité, nitrates et phosphates) et l’échantillonnage des taxons ont été réalisés entre 8h et 12h dans trois stations de la lagune Vodroboué (V1, V2 et V3) et son embouchure (E) pendant les périodes 2014-2015 et 2016-2017. Les échantillons pour le phytoplancton ont été prélevés à l’aide de la bouteille hydrologique, puis filtrés avec le filet à plancton. L’épiphyton a été récolté sur des macrophytes localisés dans le plan d’eau lagunaire à l’embouchure et au niveau des berges des stations V1, V2 et V3. Les taxons Torodinium sp. de la classe des Dinophyceae, Paraphysomonas uniformis hemiradia sp. n. Type de la classe des Chrysophyceae, les écailles de Mallomonas sorohexareticulata Jo, Shin, Kim, Siver & Andersen sp. nov., Mallomonas sp. et Mallomonas sp. 1 de la classe des Synurophyceae ont été observés pour la première fois en Côte d’Ivoire. Selon la diagnose des taxons, une similarité de l’ultrastructure des écailles de Mallomonas sorohexareticulata sp. nov. d’une part, et d’autre part, celles de Mallomonas sp. serait liée à la tolérance à la température. Pour ce qui concerne leur écologie, les taxons ont tolérés des pH acido-alcalines, une faible conductivité, une température et des taux de nutriments modérés. Les résultats de cette étude contribuent à la connaissance de quelques taxons de Dinophyta et de Chrysophyta qui pourraient être utilisés pour l’enseignement et les études de taxonomie des microalgues. Diagnosis and ecology of some microalgae from the Vodroboué lagoon and around its mouth ABSTRACT Succinct description and ecology of one Dinophyta taxa and some Chrysophyta taxa were realized from scanning electron microscope (SEM) and physico chemical parameters. Measurements of physicochemical parameters (temperature, pH, conductivity, nitrates and phosphates) and sampling of taxa were carried out between 8 and 12 in three stations of the Vodroboué lagoon (V1, V2 and V3) and its mouth (E) during 2014-2015 and 2016-2017 periods. Samples for phytoplankton were collected using the hydrologic bottle and then filtered with the plankton net. The epiphyton was collected by expression method on macrophytes located in the lagoon at the mouth and at the banks of V1, V2 and V3. Torodinium sp. of the Dinophyceae class, Paraphysomonas uniformis hemiradia sp. n. Type of Chrysophyceae class, the scales of Mallomonas sorohexareticulata Jo, Shin, Kim, Siver & Andersen sp. nov., Mallomonas sp. and Mallomonas sp. 1 of the class Synurophyceae were observed for the first time in Ivory Coast. According to the diagnosis of taxa, a similarity of the ultrastructure of Mallomonas sorohexareticulata sp. nov. scales, on the one hand, and Mallomonas sp. scales on the other hand would be related to temperature tolerance. Concerning their ecology, taxa have tolerated acido-alkaline pH, low conductivity and moderate temperature and nutrient levels. Results of this study contribute to the knowledge of some Dinophyta and Chrysophyta taxa can be used for teaching and microalgae taxonomy studies.

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