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natashaphillips

Date

May 5, 2019

Description

WORKING TO REIDENTIFY

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natashaphillips

Date

May 5, 2019

Description

STILL WORKING TO DETERMINE SPECIES

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natashaphillips

Date

January 25, 2019

Place

(Somewhere...)

Description

Valve margin triundulate. Central undulation is slightly broader than distal undulation. Apices are broadly rounded to cuneate. Central area is large and rhomboidal. Raphe is filiform and straight. Striae parallel, becoming radiate toward the central nodule and divergent at the ends. Length of specimen 39.4 um.

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natashaphillips

Date

January 25, 2019

Description

Valves clavate with rounded apices. Frustules heteropolar, appearing bent in girdle view. Ventral valve concave. Dorsal valve convex. Central area oval to elliptic. Pseudoseptum present at both poles on valve margins. Striae uniseriate. Areolae apically elongated.

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natashaphillips

Date

May 5, 2019

Description

Valves are clavate, with tumid central area. Distinctly capitate headpole, footpole narrow and rounded. Bow-tie shaped central area. Singled, rounded external stigma present in central area. Raphe lateral and undulate, with expanded external proximal ends. Distinct apical pore field present at footpole.

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natashaphillips

Date

May 14, 2019

Description

Valves cruciform with rostrate to capitate ends. Central margin inflated and narrowly or widely curved. Valve face flat, or slightly undulate due to raised costae. Length 14.79 um for this specimen.

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natashaphillips

Date

May 14, 2019

Description

The axial area is relatively narrow, even and straight. The central area is a rectangular or slightly bow-tie-shaped subfascia. The length of this specimen is 60 um. Distinctive silica bars are present at the poles. There is a large transversely expanded central area of variable shape. S. pupula cells are solitary, motile and are usually epipelic.

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natashaphillips

Date

May 14, 2019

Description

Raphe canal aligned with ventral margin at distal ends, the central arch of the canal is approximately 7-8 um above the ventral margin. In 10 um there are approximately 9-10 striae and 4-5 costae. Epithemia turgida contains nitrogen-fixing cyanobacteria, which enables it to live in habitats with a low Nitrogen to Phosphorus ratio.

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natashaphillips

Date

May 14, 2019

Description

Dorsiventral valve face with a strongly convex dorsal margin and a weakly concave ventral margin. My population is between 25-35 um long, 6-10 um wide. 12 striae and 8 costae in 10 um. The raphe canal runs along the ventral margin at the distal ends of the valve and arches towards the dorsal margin at the valve center. The apex of the canal almost reaches the dorsal margin.

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natashaphillips

Date

May 14, 2019

Description

The larger valves I have found in this population are undulating to form two nodes, giving this specimen the variety form binodis. Valves have rostrate to subcapitate ends. The central margin is constricted in these specimens because they are longer. The valve face is flat or slightly undulate due to coarse/raised costae. The valve face or mantle junction forms a distinctively sharp angle.

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natashaphillips

Date

May 14, 2019

Description

Valves are semi-lanceolate to semi-elliptical. The dorsal margin is subtly arched in the larger specimen, more dramatically arched in the smaller specimen.

Sample was taken with a 20 um net, planktonic sample.

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natashaphillips

Date

May 14, 2019

Description

Valves are broadly linear with a central pinch and taper into blunt ends. Striations between ribs are defined by fine striae. Raphe is contained in a canal around the margin of the valve. Undulations are oriented across the face and persist throughout the entire length of the valve face.

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natashaphillips

Date

May 14, 2019

Description

Valves are concentrically undulate discs with a convex, or concave, valve face. The valves are large and robust. Areolae large and circular to trapezoidal to sub-hexagonal in shape, arranged in uniseriate rows in the valve center, and become fasciculate in the outer 2/3 of the valve radius.

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natashaphillips

Date

May 15, 2019

Description

Valves are asymmetric, with broad headpole, almost as wide as the central area. Footpole is narrow and rounded, with pore field bisected by the distal raphe. Axial area is wide and linear-lanceolate. Raphe is complex and lateral. Central area is small, central striae of variable length. Central area contains a single isolated stigma. Striae are parallel to slightly radiate.

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natashaphillips

Date

May 15, 2019

Description

Valves are linear to linear-lanceolate, sides are parallel. The side bearing the keel is concave at the center. Apices are nearly capitate. A distinct central nodule is present.

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natashaphillips

Date

May 15, 2019

Description

Valves are small, disc-shaped, with a concentrically undulate valve face. Valve faces are complementary, with scutate (raised) and lacunate (depressed) valves. Areolae are dispersed randomly at the valve center and arranged in multiseriate fascicles toward the margin.

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natashaphillips

Date

May 15, 2019

Description

I need help with describing this species. I cannot find a written description of it in the reference I used to ID it.

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natashaphillips

Date

May 15, 2019

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natashaphillips

Date

May 15, 2018

Description

Valves linear-oblong. Valve face flat, isopolar with capitate apices. Length in this population ranges from 30.12-55.4 um.

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natashaphillips

Date

May 15, 2019

Description

Valves heteropolar. Headpole broadly rounded, footpole cuneately rounded to broadly rounded. Valves slightly undulate. Costae extend from margin to apical axis. Length range found in this sample 25.60-37.2 um.

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natashaphillips

Date

May 15, 2019

Description

Valves dorsi-ventral, with relatively even area on dorsal and ventral sides. Rounded apices. Outline of valve cymbelliform-lanceolate. Central portion of ventral margin is slightly convex. Central area circular to oval. A single stigma is present between proximal raphe ends. Length range in this sample from 105.21-127.70 um.

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natashaphillips

Date

May 15, 2018

Description

Central nodule located in the keel. Apices round to capitate. Length range from 130.3-138.7 um. Fibulae 8-9 in 10 um.

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natashaphillips

Date

May 15, 2018

Description

Valves linear, with apices bent towards the ventral margin. The center is deflected slightly towards the dorsal margin and notched. The raphe is positioned in a canal. Costae are prominent, and extend across the valve face.

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natashaphillips

Date

the past

Description

Valves are slender and sigmoid. They smoothly taper to rounded ends. The central area is small and longitudinally elliptical.

The raphe is straight and central for half its length, except near distal ends where it follows a sigmoid shape.

Proximal raphe ends project into the central area, curve in opposite directions.

Areolae are uniseriate and punctate, except near margin where they appear more lineolate.

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natashaphillips

Date

May 13, 2019

Description

Melosira varians is very common in rivers and lakes across North America. This species is considered to be tolerant of poor water quality. M. varians is primarily found in benthic habitats, with cells joined in long filamentous chains.

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natashaphillips

Date

May 15, 2018

Description

B. paxillifer has a long, narrow and linear valve, with a centrally located keel containing the raphe. Striae are distinct, course and parallel and perpendicular to the keel. Living cells are joined in colonies, which are joined by hooks along the keel.

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natashaphillips

Date

May 15, 2019

Description

Nitzschia umbonata.

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natashaphillips

Date

May 16, 2019

Description

Valves rhombic-lanceolate. Central area wide, tapers to narrow apices. Striae parallel and equidistant throughout valve. Axial area narrow, central area slightly widened. Raphe is filiform, proximal raphe ends expanded. Length 108.7 um, width 26.79 um.

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natashaphillips

Date

May 16, 2019

Description

Valves disc-shaped, with narrow mantle. Valve face may be flat or transversely undulate. Central area is distinct and isolated from the marginal chambered striae. Central area covers 1⁄ 2 to 1⁄ 3 of the valve face and contains 1-4 fultoportulae. The number of costae in 10 µm is 12-15. Length of diameter in this sample ranged from 10.35-16.9 um.

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natashaphillips

Date

May 15, 2018

Description

Valves are elliptical-lanceolate. Apices are capitate to subcapitate. Axial area is narrow and linear. Central area is small, round or elliptical. Raphe is straight, filiform. Raphe ends slightly expanded. Striae are biseriate, radiate in the valve center and convergent at the apices. Areolae are elongated and oriented in the apical axis.

Length range from 19-29 um in this sample.

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