scholarly journals Mantoniella Beaufortii and Mantoniella Baffinensis sp. nov. (Mamiellales, Mamiellophyceae), Two New Green Algal Species from the High Arctic

2018 ◽  
Author(s):  
Sheree Yau ◽  
Adriana Lopes dos Santos ◽  
Wenche Eikrem ◽  
Catherine Gérikas Ribero ◽  
Priscilla Gourvil ◽  
...  
Keyword(s):  
New Species ◽  
Algal Species ◽  
High Arctic ◽  
The Arctic ◽  
Temperate Species ◽  
Polar Species ◽  
Molecular Features ◽  
Green Algal ◽  
The Family ◽  
Polar Distribution

AbstractMembers of the class Mamiellophyceae comprise species that can dominate picophytoplankton diversity in polar waters. Yet polar species are often morphologically indistinguishable from temperate species, although clearly separated by molecular features. Here we examine four Mamiellophyceae strains from the Canadian Arctic. The 18S rRNA and Internal Transcribed Spacer 2 (ITS2) gene phylogeny place these strains within the family Mamiellaceae (Mamiellales, Mamiellophyceae) in two separate clades of the genus Mantoniella. ITS2 synapomorphies support their placement as two new species, Mantoniella beaufortii and Mantoniella baffinensis. Both species have round green cells with diameter between 3–5 μm, one long flagellum and a short reduced flagellum (~1 μm) and are covered by spiderweb-like scales, making both species similar to other Mantoniella species. Morphologically, M. beaufortii and M. baffinensis are most similar to the cosmopolitan M. squamata with only minor differences in scale structure distinguishing them. Screening of global marine metabarcoding datasets indicates M. beaufortii has only been recorded in seawater and sea ice samples from the Arctic while no environmental barcode matches M. baffinensis. Like other Mamiellophyceae genera that have distinct polar and temperate species, the polar distribution of these new species suggests they are cold or ice-adapted Mantoniella species.

scholarly journals Mantoniella beaufortii and Mantoniella baffinensis sp. nov. (Mamiellales, Mamiellophyceae), two new green algal species from the high arctic 1

2019 ◽  
Vol 56 (1) ◽  
pp. 37-51 ◽  
Author(s):  
Sheree Yau ◽  
Adriana Lopes dos Santos ◽  
Wenche Eikrem ◽  
Catherine Gérikas Ribeiro ◽  
Priscillia Gourvil ◽  
...  
Keyword(s):  
Algal Species ◽  
High Arctic ◽  
Green Algal ◽  
Green Algal Species

scholarly journals Molecular Phylogeny of Unicellular Marine Coccoid Green Algae Revealed New Insights into the Systematics of the Ulvophyceae (Chlorophyta)

2021 ◽  
Vol 9 (8) ◽  
pp. 1586
Author(s):  
Tatyana Darienko ◽  
Cecilia Rad-Menéndez ◽  
Christine N. Campbell ◽  
Thomas Pröschold
Keyword(s):  
Green Algae ◽  
Life Histories ◽  
Phylogenetic Analyses ◽  
Algal Species ◽  
Marine Species ◽  
Life Cycles ◽  
Rdna Sequences ◽  
Green Algal ◽  
The Family ◽  
Chloroplast Formation

Most marine coccoid and sarcinoid green algal species have traditionally been placed within genera dominated by species from freshwater or soil habitats. For example, the genera Chlorocystis and Halochlorococcum contain exclusively marine species; however, their familial and ordinal affinities are unclear. They are characterized by a vegetative cell with lobated or reticulated chloroplast, formation of quadriflagellated zoospores and living epi- or endophytically within benthic macroalgae. They were integrated into the family Chlorochytriaceae which embraces all coccoid green algae with epi- or endophytic life phases. Later, they were excluded from the family of Chlorococcales based on studies of their life histories in culture, and transferred to their newly described order, Chlorocystidales of the Ulvophyceae. Both genera form a “Codiolum”-stage that serves as the unicellular sporophyte in their life cycles. Phylogenetic analyses of SSU and ITS rDNA sequences confirmed that these coccoid taxa belong to the Chlorocystidales, together with the sarcinoid genus Desmochloris. The biflagellated coccoid strains were members of the genus Sykidion, which represented its own order, Sykidiales, among the Ulvophyceae. Considering these results and the usage of the ITS-2/CBC approach revealed three species of Desmochloris, six of Chlorocystis, and three of Sykidion. Three new species and several new combinations were proposed.

Redescription of Leptogyra bujnitzkii (Gorbunov, 1946) comb. nov., the first representative of the gastropod subclass Neomphaliones from the high Arctic

Zootaxa ◽  
2020 ◽  
Vol 4759 (3) ◽  
pp. 446-450
Author(s):  
EKATERINA N. KROL ◽  
IVAN O. NEKHAEV
Keyword(s):  
Arctic Ocean ◽  
Original Description ◽  
Type Specimen ◽  
High Arctic ◽  
The Arctic ◽  
Laptev Sea ◽  
The Family ◽  
The Arctic Ocean ◽  
The Laptev Sea ◽  
Shell Sculpture

Ganesa bujnitzkii Gorbunov, 1946 was described from the bathyal of the Arctic Ocean north to the Laptev Sea based on only two specimens, which were the only representatives of this species mentioned by Gorbunov (1946b). Galkin (1955) noted that the shell sculpture of Ganesa bujnitzkii is similar to that of Cyclostrema valvatiodes (Jeffreys, 1883), and that the radula of the G. bujnitzkii differs from other species of the genus Ganesa Jeffreys, 1883 and members of the family Trochidae. Later, based on the original description, Warén (1993) proposed that the species may belong to the genus Skenea; however, he did not examine the type specimen. This opinion was reiterated by Kantor & Sysoev (2006). 

Two new species of Cryptopontius Giesbrecht, 1899 (Copepoda, Siphonostomatoida, Artotrogidae) associated with invertebrates from Northeastern Brazil

Zootaxa ◽  
2020 ◽  
Vol 4810 (3) ◽  
pp. 481-494
Author(s):  
AMILCAR FARIAS ◽  
ELIZABETH G. NEVES ◽  
RODRIGO JOHNSSON
Keyword(s):  
New Species ◽  
Northeastern Brazil ◽  
The Arctic ◽  
Brazilian Coast ◽  
Exopodal Segment ◽  
Key To Species ◽  
The Family ◽  
Two New Species ◽  
Almost All ◽  
Species Being

Cryptopontius is the most species-rich genus in the family Artotrogidae with 25 species, being recorded in almost all oceans, except in the Arctic. However only three species of this genus have been recorded from the Brazilian coast, all of them along the coast of Pernambuco state. This study describes two new species of the genus. Cryptopontius phyllogorgius sp. nov. differs from other species by having 9-segmented antennule, and nine elements on the third exopodal segment of leg 4. Cryptopontius pentadikos sp. nov. differs from its congeners by having five expressed antennulary segments proximal to fused ancestral IX-XII, two setae on second endopodal segment of leg 1, eight elements on third exopodal segment of leg 1 and the free segment of leg 5 with two setae. A key to species of the genus Cryptopontius is provided. 

scholarly journals Molecular phylogeny of Parabathynellidae (Crustacea, Bathynellacea), and three new species from Thai caves

2018 ◽  
Vol 87 (4) ◽  
pp. 227-260 ◽  
Author(s):  
Ana I. Camacho ◽  
Paloma Mas-Peinado ◽  
Santi Watiroyram ◽  
Anton Brancelj ◽  
Elia Bandari ◽  
...  
Keyword(s):  
New Species ◽  
North Africa ◽  
Middle Miocene ◽  
First Record ◽  
Nuclear Markers ◽  
Molecular Features ◽  
The Family ◽  
Molecular Phylogenetic ◽  
Phylogenetic Framework ◽  
Three New Species

A preliminary molecular phylogenetic framework for 12 genera (23 species) of the family Parabathynellidae from Europe, Australia, North Africa and India is presented based on mitochondrial and nuclear markers (Cox1 and 18S). The generated hypothesis places the Southeast Asia genus Paraeobathynella closer to European genera (Iberobathynella, Paraiberobathynella and Parabathynella) than to the Australian (Brevisomabathynella, Atopobathynella, Billibathynella, Octobathynella, Arkaroolabathynella and Lockyerenella) or Indian genera (Habrobathynella), or to the cosmopolitan genus Hexabathynella (Spain and Australia). Three new species of the genus Paraeobathynella from Thailand, P. ratensis n. sp., P. siamensis n. sp. and P. hanjavanitiana n. sp., are described based on morphological and molecular features. This is the first record of the genus from Thailand and extends its range of distribution within Asia, where it was previously known only from Vietnam. The new species are clearly separated as independent units at least since the Middle Miocene.

Preliminary assessment of the β-dimethylsulfoniopropionate (DMSP) content of macroalgae from the tropical island of Hainan (People's Republic of China)

1994 ◽  
Vol 45 (7) ◽  
pp. 1329 ◽  
Author(s):  
B Bischoff ◽  
U Karsten ◽  
C Daniel ◽  
K Kuck ◽  
B Xia ◽  
...  
Keyword(s):  
Algal Species ◽  
People’S Republic Of China ◽  
People's Republic Of China ◽  
Preliminary Assessment ◽  
Tropical Island ◽  
Republic Of China ◽  
Polar Species ◽  
Green Algal ◽  
Red Algal ◽  
Almost All

The β-dimethylsulfoniopropionate (DMSP) contents of 46 macroalgal species from the tropical island of Hainan, People's Republic of China, were determined by gas-liquid phase chromatography. In almost all investigated green, brown and red algal species, DMSP could be detected. The highest concentrations were measured in members of the green algal order Ulvales, and these were similar to those of isolates from polar and temperate regions. The tropical Ulvales from Hainan are comparable in their DMSP contents with temperate species of this order. Polar species, in contrast, exhibit significantly higher DMSP values.

scholarly journals Biodiversity hotspot in cold waters: a review of the genus Cuthonella with descriptions of seven new species (Mollusca, Nudibranchia)

2020 ◽  
pp. 1-68
Author(s):  
Tatiana A. Korshunova ◽  
Nadezhda P. Sanamyan ◽  
Karen E. Sanamyan ◽  
Torkild Bakken ◽  
Kennet Lundin ◽  
...  
Keyword(s):  
New Species ◽  
North Pacific ◽  
Cold Water ◽  
Biodiversity Hotspot ◽  
Morphological Data ◽  
The Arctic ◽  
The Family ◽  
History Of ◽  
Taxonomic Confusion ◽  
The Kuril Islands

Cuthonella Bergh, 1884 is of one of the most neglected nudibranch groups, with a long history of taxonomic confusion with other aeolidacean genera. Owing to its predominantly Arctic distribution with cold water, its species are difficult to find and to collect, and thus to describe. In this study we revise the genus by presenting molecular and morphological data for a majority of the species, including the type, C. abyssicola Bergh, 1884. The material is based on a broad geographic sampling throughout the Northern Hemisphere. Particular emphasis is placed on the Kuril Islands, a diversity hotspot for the genus. Seven new species and two subspecies of Cuthonella are described from the Arctic and North Pacific regions. The number of species of Cuthonella is thus increased over threefold and now comprises 15 species plus two subspecies instead of five species. This work is the most substantial update of the genus Cuthonella since its description in 1884. To delineate taxonomic and phylogenetic limits of Cuthonella-like aeolidaceans, the molecular phylogeny of the wider traditional “tergipedids” is presented and shows that Cuthonella-like aeolidaceans form a distinct molecular clade as the family Cuthonellidae Miller, 1977, corroborated by reliable morphological apomorphies.

Nematodes of the family Neotylenchidae (Tylenchida:Nematoda) from the Canadian high Arctic

1969 ◽  
Vol 47 (6) ◽  
pp. 1261-1268 ◽  
Author(s):  
R. H. Mulvey
Keyword(s):  
New Species ◽  
High Arctic ◽  
Nominal Species ◽  
Canadian High Arctic ◽  
Taxonomic Key ◽  
The Family ◽  
Two New Species ◽  
First Time

Six species of nematodes in the family Neotylenchidae, including two new species, are reported from the Canadian high Arctic for the first time. Hadrodenus n. gen. is established for species similar to Deladenus Thorne, 1941, but with a more anterior vulva and a postuterine sac. Deladenus saccatus Andrássy, 1954 is transferred to this genus. H. megacondylus n. sp. and Nothotylenchus attenuatus n. sp. are described and illustrated. Measurements and illustrations of the known species N. acris, N. acutus, N. danubialis, and Stictylus mucronatus, and a taxonomic key to the nominal species of these genera, are provided.

A new species of Menestho Møller, 1842 from the Arctic with remarks on Menestho albula (Fabricius, 1780)(Gastropoda: Heterobranchia: Pyramidellidae)

Zootaxa ◽  
2017 ◽  
Vol 4347 (1) ◽  
pp. 196 ◽  
Author(s):  
IVAN O. NEKHAEV
Keyword(s):  
New Species ◽  
North Atlantic ◽  
Barents Sea ◽  
The Arctic ◽  
Valuable Contribution ◽  
Arctic Seas ◽  
The Family ◽  
A New Species

North Atlantic and Arctic representatives of the family Pyramidellidae had been intensively studied during the last decades. A valuable contribution was made by Warén (1989; 1991; 1993), who partially revised several genera from the Scandinavian waters. Norwegian representatives of the family were reviewed by Høisæter (2014). Distribution and diagnostic of many species had been specified by Schander (1995) and Nekhaev (2011; 2014; 2017). However, in the Eurasian Arctic Seas (except for the SW Barents Sea) only five species of Pyramidellidae had been recorded (Golikov et al. 2001; Kantor & Sysoev 2006; Nekhaev 2017): Liostomia eburnea (Stimpson, 1851), Chrysallida sublustris (Friele, 1886), Amaura candida (Møller, 1842), Amaura arctica (Dall et Bartsch, 1909) and Menestho truncatula Odhner, 1915. 

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