Cocconeis tortilis: a new marine diatom (Bacillariophyta, Cocconeidaceae) from Japan

Phytotaxa ◽  
2014 ◽  
Vol 161 (3) ◽  
pp. 219 ◽  
Author(s):  
Hidekazu Suzuki ◽  
TAMOTSU NAGUMO ◽  
JIRO TANAKA
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Light And Electron Microscopy ◽  
Central Area ◽  
Marine Diatom ◽  
A New Species ◽  
Apical Axis

A new species of Cocconeis, C. tortilis, was found on some seaweed collected from the Izu and Okinawa Islands of Japan. Its morphology was examined using both light and electron microscopy; details are described herein. This small diatom is characterized by: 1) a concave raphid valve with a straight raphe inclined from the apical axis, central area forming stauros, and uniseriate striae consisting of circular areolae occluded by hymens: 2) a twisted convex araphid valve with a narrow lanceolate sternum inclined from the apical axis, and uniseriate striae consisting of several loculate areolae occluded by hymens: and 3) a cingulum consisting of three non fimbriated girdle bands including a valvocopula.

Cymbopleura huohuaensis sp. nov. (Cymbellaceae; Bacillariophyceae), a new species from Sichuan Province, China

Phytotaxa ◽  
2022 ◽  
Vol 530 (2) ◽  
pp. 237-244
Author(s):  
JI-SHU GUO ◽  
WEN-WEN MENG ◽  
JOHN PATRICK KOCIOLEK ◽  
SOPHIA YANG ◽  
YAN-LING LI
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Central Area ◽  
Sichuan Province ◽  
The Other ◽  
Morphological Description ◽  
Apical Pore ◽  
A New Species ◽  
Scanning Electron ◽  
Apical Axis

Cymbopleura huohuaensis sp. nov. is identified as a new species and described from stone surfaces in Huohua Lake, Sichuan Province, China. A detailed morphological description of the new species is presented, based on light and scanning electron microscopy. Cymbopleura huohuaensis sp. nov. has the features that assign it to the genus Cymbopleura, including the raphe with dorsally deflected terminal fissures and ventrally curved central raphe ends, punctate-lineate striae, and the absence of apical pore fields and stigmata. There are five features that easily distinguish the new species from the other similar taxa within the genus: 1) linear-lanceolate central area, 2) mostly slit-like, partly T-shaped, V-shaped or irregularly-shaped areolae, 3) strongly reverse-lateral raphe, 4) slightly truncate to obtusely rounded ends and 5) the highest density of areolae (30–50 in 10 μm). Among the currently described species of Cymbopleura, the new species is in general most similar to C. subaequalis var. pertruncata in valve shape and possessing a reverse-lateral raphe, but is easily distinguished from that taxon by the size and shape of valve, shape of central area, and the degree of asymmetry about the apical axis and its notable lack of an intermissio. This species might be better placed in the C. austriaca group due to its lack of an intermissio. These findings increase our understanding the morphology and distribution of the genus Cymbopleura in China.

Four new species of monoraphid diatoms from Western Sichuan Plateau in China

Phytotaxa ◽  
2021 ◽  
Vol 479 (3) ◽  
pp. 257-274
Author(s):  
Q.M. YOU ◽  
K. ZHAO ◽  
Y.L. WANG ◽  
P. YU ◽  
J.P. KOCIOLEK ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Central Area ◽  
Morphological Characteristics ◽  
Similar Species ◽  
Small Species ◽  
Western Sichuan ◽  
The Relationship ◽  
Scanning Electron ◽  
Apical Axis

Four new monoraphid diatoms are examined and described from a high-altitude (> 3000 m) region of western Sichuan, China.  The descriptions are based on light and scanning electron microscopy observations, and the four new species are compared with similar taxa worldwide.  Achnanthidium sichuanense sp. nov. has small, lanceolate-elliptical valves, with rounded apices. The outline and central area differentiate it from similar species.  The unique characteristic of Eucocconeis undulatum sp. nov. is that it has valves that are undulate along the apical axis, forming an “H”-shaped area on both raphe and rapheless valves as seen in light microscope (LM).  Platessa mugecuonesis sp. nov. and Platessa lanceolata sp. nov. are two small species, whose valve outlines and central areas make them different from other species in this genus.  A. sichuanense sp. nov. and E. undulatum sp. nov. are discussed in terms of the relationship between “Achnanthidium & Psammothidium” and “Eucocconeis & Psammothidium”, as these genera are difficult to separate according to morphological characteristics.

A new species of Neidiomorpha (Bacillariophyceae) from Dianshan Lake in Shanghai, China

Phytotaxa ◽  
2019 ◽  
Vol 423 (2) ◽  
pp. 99-104
Author(s):  
FEN LUO ◽  
QI YANG ◽  
KAIJUAN GUO ◽  
TENGTENG LIU ◽  
QUANXI WANG ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Central Area ◽  
Diatom Species ◽  
Dianshan Lake ◽  
A New Species ◽  
Scanning Electron

A new diatom species, Neidiomorpha dianshaniana sp. nov., found in Dianshan Lake in Shanghai, China, is described herein. The morphology of N. dianshaniana has been documented by light and scanning electron microscopy. Neidiomorpha dianshaniana valves are elliptical in outline with rostrate apices. Raphe is almost straight and filiform. The axial area is narrow and linear. The central area is small, round to transversely elliptical or irregular. Striae are slightly radiate and almost parallel near the apices. Puncta are arranged in undulating longitudinal rows. Neidiomorpha dianshaniana’s most visible feature is its lack of central constriction, in which respect it differs from the three other species in the genus Neidiomorpha.

scholarly journals Hantzschia subandina Frenguelli (Bacillariophyceae): Morphology, status and typification, as well as the description of a new species of Nitzschia

2020 ◽  
Vol 55 (4) ◽  
Author(s):  
John P. Kociolek ◽  
Amelia A. Vouilloud
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Taxonomic Status ◽  
Ventral Side ◽  
Phylogenetic Position ◽  
Original Material ◽  
New Taxon ◽  
A New Species ◽  
Scanning Electron ◽  
Apical Axis

Backgrounds and aims: Hantzschia Grunow is a genus characterized by having valves asymmetric to the apical axis, markedly dorsiventral, with an eccentric raphe on the ventral side supported by fibulae and ‘hantzschioid’ symmetry of the frustules. In 1942 J. Frenguelli published the flora of diatoms of Neuquén province (Argentina), work in which he erected Hantzschia subandina as a new species for science. This work investigates the identity and taxonomic status of this taxon.  M&M: Original material of Hantzschia subandina of the Frenguelli Collection was analysed with light and scanning electron microscopy. Results: Observations on the material suggested two different species were included in the concept of this species assigned originally to the genus Hantzschia. Furthermore, neither of the two species present are assignable to the genus Hantzschia. Nitzschia subandina (Frenguelli) comb. nov. has a large central nodule and a slight asymmetry about the apical axis; it also produces frustules with nitzschioid and hantzschioid symmetry. We designate a lectotype for this taxon. In addition, another diatom in the same material with slight asymmetry about the apical axis has distinctive ornamentation on the mantle of the valve and produces nitzschioid and hantzschioid frustules. For this taxon we tentatively assign it to the non-monophyletic genus Nitzschia, describing it as N. araucana sp. nov. We discuss the possible phylogenetic position of this new taxon, and suggest that the genus Nitzschia is “the next Navicula” ready to be further subdivided into distinct genera.

Mallomonas lusca sp. nov. (Synurales, Chrysophyceae)—a rare species from Southeast Asia

Phytotaxa ◽  
2021 ◽  
Vol 529 (1) ◽  
pp. 105-112
Author(s):  
EVGENIY GUSEV ◽  
ELENA KEZLYA
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
New Species ◽  
Southeast Asia ◽  
Rare Species ◽  
Central Area ◽  
Scale Morphology ◽  
Transmission Electron ◽  
Silica Scale ◽  
A New Species

A new species of tropical chrysophyte algae, Mallomonas lusca sp. nov. is described from Vietnam based on silica-scale morphology observed using scanning and transmission electron microscopy. Scales of this species were previously found in Malaysia, but had not yet been described. Mallomonas lusca belongs to section Torquatae and is most similar to M. favosa. Its scales have a unique conspicuous rounded pit with a raised thickened central area, which develops in association with the posterior pore in the angle of the posterior submarginal rib. This rounded pit is surrounded by delicate papillae across the border on the shield. Mallomonas lusca has been observed in six localities in Vietnam and one in Malaysia.

Oricymba gongshanensis sp. nov. (Cymbellaceae; Bacillariophyceae), a new species from southwest China

Phytotaxa ◽  
2021 ◽  
Vol 508 (1) ◽  
Author(s):  
JI-SHU GUO ◽  
WEN-WEN MENG ◽  
XIAO-YANG HE ◽  
YUN ZHANG ◽  
YAN-LING LI ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Yunnan Province ◽  
Southwest China ◽  
Morphological Description ◽  
Single Opening ◽  
A New Species ◽  
Scanning Electron ◽  
Apical Axis

Oricymba gongshanensis sp. nov. is identified as a new cymbelloid species, and described from a rock wall in Gongshan County, Yunnan Province, China. A detailed morphological description of the new species is presented, based on light and scanning electron microscopy. O. gongshanensis sp. nov. has the features that assign it to the genus Oricymba, including a thickened ridge positioned around the margin of the valve, presence of pore fields at the apices, a stigma with a single opening externally and two openings internally together with external distal raphe ends deflected dorsally. There are three features that easily distinguish the new species from all others in the genus. They include: 1) valves that are weakly asymmetrical about the apical axis, 2) presence of mostly biseriate striae and 3) areolae that are round to elliptical in shape. Among the currently described species of Oricymba, the new species is most similar to O. tianmuensis in valve shape, but is easily distinguished by the degree of asymmetry about the apical axis and presence of biseriate striae. These findings increase our understanding the morphology and distribution of the genus Oricymba in China.

Sellaphora mayrii (Bacillariophyceae), a new diatom from the Argentinean Patagonia

Phytotaxa ◽  
2020 ◽  
Vol 437 (3) ◽  
pp. 135-146
Author(s):  
M. LUJÁN GARCÍA ◽  
EDUARDO A. MORALES ◽  
DAVID G. MANN ◽  
NORA I. MAIDANA
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Size Range ◽  
Central Area ◽  
Chemical Characteristics ◽  
New Taxon ◽  
Santa Cruz ◽  
Physico Chemical ◽  
Argentinean Patagonia ◽  
A New Species

A new species of Sellaphora was found in modern and fossil sediments from shallow-lake Laguna Gemelas Este, Santa Cruz, Argentina. The new taxon was studied with light microscopy and scanning electron microscopy. We present a detailed analysis of its morphology, supporting its placement in the genus Sellaphora Mereschkowsky, and report the physico-chemical characteristics of the lake where it was found. Sellaphora mayrii sp. nov. is most similar to S. smirnovii Chudaev & Gololobova, a small-celled species first reported from Russia. Both species have in common the valve outline, but the new species from Argentina has a wider size range and, when observed with electron microscopy, is visibly different regarding stria pattern, central area, and shape of the areolae.

scholarly journals Berkeleya Transfretana sp. Nov., a New Marine Diatom from Ceuta (North Africa)

2021 ◽  
Vol 9 (2) ◽  
pp. 146
Author(s):  
Adriana Olenici ◽  
Francisco Jiménez-Gómez ◽  
Saúl Blanco
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
North Africa ◽  
Coastal Area ◽  
Marine Diatom ◽  
A New Species ◽  
Scanning Electron

The diatom Berkeleya transfretana is described as a new species from samples collected at Playa Punta Sauciño, an intertidal coastal area in Ceuta, North Africa. Its main features are the comparatively small size in relation to other Berkeleya species and the very fine and dense striae pattern (more than 40 striae per 10 µm). The new species is here described under light and scanning electron microscopy and compared to related taxa. The benthos of these rocky beaches are interesting spots of biodiversity still to be explored.

Taxonomic revision and morphological cladistics analysis of the diatom genus Anorthoneis (Cocconeidaceae), with description of Anorthoneis arthus-bertrandii sp. nov.

Phytotaxa ◽  
2018 ◽  
Vol 336 (3) ◽  
pp. 201 ◽  
Author(s):  
Chiara PENNESI ◽  
ROKSANA MAJEWSKA ◽  
FRITHJOF A.S. STERRENBURG ◽  
CECILIA TOTTI ◽  
MARIO DE STEFANO
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Central Area ◽  
Taxonomic Revision ◽  
Morphological Characters ◽  
Parsimony Method ◽  
Maximum Parsimony Method ◽  
Valve Margin ◽  
Diatom Genus ◽  
A New Species

We present here an ultrastructure-based revision of the diatom genus Anorthoneis using both light (LM) and electron microscopy (SEM). The original slides and type material of all known Anorthoneis species were analysed and new, previously unseen, morphological features of the frustules, such as rota-like vela and ligulate structures around the valve margin, were revealed. The phylogenetic relationships among Anorthoneis taxa were investigated based on morphological characters using a maximum parsimony method. This analysis indicated a large, well-supported clade that included taxa that exhibited similarities in external and internal details of the central areas in both raphe-sternum and sternum valves. Revealed synapomorphies within the genus include externally and internally transversely dilated central area on both sides of the raphe-sternum valve, externally transversely dilated central area on both sides of the sternum valve, sternum valve striae parallel at the center and radiate at the apices, and areolae with hymenes in both valves. During a survey a new species Anorthoneis arthus-bertrandii sp. nov., was found on seagrass leaves collected from Siladen Island (Indonesia). This taxon is sister to A. hyalina, but can be easily differentiated from the latter by smaller valve dimensions, central area size and shape, and rota-like vela occluding sternum valve areolae - a feature that has never been observed in other Anorthoneis taxa. 

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