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Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 19, 2017

Descripción

Scale bar = 10 µm

Valves are biundulate. The axial area is wide; sometimes nearly as wide as the central constriction. Differentiated from the similar Staurosira contruens var. binodis based on striae characteristics and valve size.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Mayo 30, 2018

Descripción

Scale bar = 10 µm

Parallel chloroplasts and lipid bodies are distinctive of this genus, as well as the shape of the valve. Not possible to ID to species with live material.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

S. smithii has characteristic apiculate apices with pseudosepta. Valves are larger with less dense striae compared to the otherwise similar S. separanda. These valves vary in the structure of their apices, but specimens with varying structures are represented in different sources (Foged, 1981; Bahls, 2012).

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

T. flocculosa is especially common in northern waters, and has a characteristic hyaline area in the central valve, as opposed to T. fenestrata.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µ

Valves are slightly wider than those described by Minerovic (2016) on diatoms.org, but are consistent with the detailed description (valve size, valve shape, striae density) by Wetzel et al. (2015).

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

Mann et al. (2004) explain the subtle differences between S. capitata and S. blackfordensis. These valves are identified as S. blackfordensis primarily based on: 1) slightly sinuous raphes, 2) slightly wider valves and 3) slightly less capitate valves compared to those of S. capitata. Identification of these species is more fruitful when both are present, and the likely presence of S. capitata in this sample aided in identification. However, according to Mann et al. (2004), "describing the differences exactly in words is not possible" and "identification can be extremely difficult."

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

Specimens are similar in size to Pinnularia neomajor var. inflata as described by Krammer (2000), but have striae density closer to that of Pinnularia neomajor var. frequentis.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

The striae in these specimens are less dense than those reported by Krammer (2000), but the distinctive central area, valve shape, striae patterning, length, width, and length to width ratio (~5) are consistent with the Krammer (2000) P. savona identification. Around the central area striae density in these specimens is closer to that reported by Krammer (2000) (5/10 µm).

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 19, 2017

Descripción

Scale bar = 10 µm

E. adnata has valves that are dorsiventral and taper toward rounded rostrate ends. The dorsal margin is convex, while the ventral margin is concave. This species is distinguished from E. turgida based on its finer striae and its larger number of striae per costae.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 19, 2017

Descripción

Scale bar = 10 µm

Valves are biundulate, differentiating them from the nominate variety S. construens. Valves are small with rostrate to subcapitate ends. Differentiated from the similar Pseudostaurosira robusta by striae characteristics and valve size.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 19, 2017

Descripción

Scale bar = 10 µm

Valves are small, cruciform, and have rostrate to subcapitate ends. The central margin is inflated and curved. S. construens is differentiated from Pseudostaurosira pseudoconstruens based on its more narrow central sternum, and from Staurosirella leptostauron based on its narrower striae.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 19, 2017

Lugar

Kelly Lake (Google, OSM)

Descripción

Scale bar = 10 µm

C. inaequalis has rhomboid-lanceolate valves, with bluntly rounded apices that are subrostrate to rostrate. The species is differentiated from C. lata by its wider valves, and from C. crassipunctata and C. heinii by its more rhomboid (rather than lanceolate) shaped valves. Additionally, the simple raphe ends differentiate C. inaequalis from C. apiculata, C. subcuspidata, and C. subrostrata.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 19, 2017

Lugar

Kelly Lake (Google, OSM)

Descripción

Scale bar = 10 µm

A. subarctica has straight mantle sides and rows of aeriolae curved to the right. Robust spines are visible. A. subarctica is differentiated from A. ambigua by its lack of a hollow ringleiste, and from A. pusilla by its higher mantle height to valve diameter ratio.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Agosto 15, 2016

Descripción

Scale bar = 10 µm

N. vulpina has broadly, rounded apices with hook-like distal raphe ends. Striae are radiate, becoming parallel to convergent near the apices.

Measurements by Kociolek (2011) on diatoms.org do not reflect smaller specimens in this population, but measurements by Foged (1981) do; conversely, measurements by Kociolek (2011) capture the largest sizes of valves in this population while Foged (1981) does not.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Agosto 15, 2016

Descripción

Scale bar = 10 µm

Valves are oval and small, with spines on the costae. It is primarily the oval shape of S. pinnata that differentiates it from S. martyi and Staurosira construens var. venter. Some specimens are slightly longer than those described by Morales (2010) on diatoms.org.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

Valves are linear with capitate apices, and have a widened, large central area. The apices are more strongly capitate than those of P. marchica, and less strongly capitate than those of P. rumrichae.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

S. elegans has large valves (110-400 µm in length, 35-90 µm in width) with coarse undulations (12-21/100 µm), and has previously been found in Alaska (Foged, 1981).

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

N. affine exhibits substantial variety in valve shape, with some morphs in the nominate variety resembling this population (Krammer and Lange-Bertalot, 1986). Some morphs are very similar to certain morphs of N. ampliatum, but are differentiated based on the shape of their apices, which are rounder and less distinct than for certain morphs of N. affine.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

According to Levkov (2009), these specimens are slightly larger than A. copulata. However, they fit the dimensions of A. affinis, which Levkov (2009) explains are so similar in morphology that they were previously assumed to be the same species. A. copulata can be identified from A. affinis by several characteristics, including the raphe ledge, which is broad than that of A. affinis, and the shape of the central area, which is smaller and bordered by striae close to the valve margin in A. copulata.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Agosto 15, 2016

Descripción

Scale bar = 10 µm

Valves are strongly dorsiventral, with a convex dorsal margin. 3-5 (usually) stigmata present in central area. C. neocistula is differentiated from similar species mainly based on aeriolae density, but can also be differentiated from C. blinni based on its lower striae density and larger valve size.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Agosto 15, 2016

Descripción

Scale bar = 10 µm

E. praerupta has a convex and smooth valve margin with rounded apices to varying degrees.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 19, 2017

Descripción

Scale bar = 10 µm

Specimens are longer than reported by Foged (1981), but have the characteristic valve length and small rounded apices.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

Valves are slender and sigmoid with rounded ends. G. acuminatum is differentiated from G. attenuatum based on its coarser striae, and from G. rautenbachiae based on its proximal raphe ends.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Mayo 16, 2016

Descripción

Scale bar = 10 µm

This species was recently transferred from the genus Surirella, and is commonly seen in the literature as Surirella linearis var. helvetica. This species has a large size range, but has a notable elliptical shape with pointed apices.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Mayo 16, 2016

Descripción

Scale bar = 10 µm

This population from Schrader Lake in the northeastern Brooks Range comprises multiple morphotypes with different striae characteristics (e.g. photo's top versus bottom row; top row is a photo of each valve of the same specimen). Specimens in the population are also unusually round, unlike other documented populations of this species. It is likely that these specimens comprise an undescribed variety, as they do not resemble any currently described varieties.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Mayo 16, 2016

Descripción

Scale bar = 10 µm

D. parma has narrow longitudinal canals that closely follow the raphe system along the apical axis. The central area is also more narrow than other similar species, such as D. elliptica. Valves are oblong to elliptical in shape.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

Valves are small and nearly round. The round valve shape differentiates C. pseudoscutiformis from C. vincentii, C. scutelloides, and C. jaernefeltii.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

Often cited as Navicula jaernefeltii, prior to the establishment of the genus Cavinula. C. jaernefeltii is characterized primarily by the valve shape, which is oblong with smooth apices that do not protrude from the valve.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

E. elginense is characterized by a nearly flat ventral margin with a slightly convex bulge near the central area, as well as pointed apices. The species is often listed in the literature as Cymbella elginensis, prior to the establishment of the genus Encyonema.

Fotos / Sonidos

Observ.

ebroadman

Fecha

Junio 11, 2017

Descripción

Scale bar = 10 µm

A. valida has valves with thick-walled mantles and aeriolae that curve to the right. Prominent, large spines and a solid ringleiste differentiate the species from A. ambigua.

Fuentes: : Átomo