Photos / Sounds

Observer

pliebrecht

Date

September 12, 2008
Epithemia adnata - Photo (c) Stephanie Robson, some rights reserved (CC BY-NC), uploaded by Stephanie Robson
sylviaslee's ID: Epithemia adnata, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 15, 2023
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Photos / Sounds

Observer

pliebrecht

Date

May 24, 2023 01:33 PM CDT

Description

outside valve view paired with internal view

Mastogloia grevillei - Photo (c) jrarick, some rights reserved (CC BY-NC), uploaded by jrarick
sylviaslee's ID: Mastogloia grevillei, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 15, 2023
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Photos / Sounds

Observer

pliebrecht

Date

May 24, 2023 09:51 PM CDT

Description

2023-22 Silver Lake Fen-Low Flark Chara Epiphytes. Proximal raphe ends bilaterally deflected. Not Neidium bisculcatum because it is found in fens, not acidic environments. Image 4 is of a tilted, girdle view. Also, stria density in this variety is consistently lower.

2nd image is an internal view, as indicated by proximal raphe ends deflecting clockwise.

scale bar 10 μm

Neidium bisulcatum subampliatum - Photo (c) karolinabrylka, some rights reserved (CC BY-NC)
sylviaslee's ID: Neidium bisulcatum var. subampliatum, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 15, 2023
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Photos / Sounds

Observer

pliebrecht

Date

May 24, 2023 05:38 PM CDT

Description

slide 2023-19, Silver Lake Fen High Flark from Periphyton
scale bar= 10 micrometers

Can see consisten Voigts's discontinuity across samples. Proximal and distal raphe ends swing unilaterally. 3rd image has two valves semi-open. Does not match a current caloneis species on Diatoms.org

Caloneis - Photo (c) jrarick, some rights reserved (CC BY-NC), uploaded by jrarick
sylviaslee's ID: Genus Caloneis, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 15, 2023
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Photos / Sounds

Observer

pliebrecht

Date

May 24, 2023 05:38 PM CDT

Description

slide 2023-19, Silver Lake Fen High Flark from Periphyton
scale bar= 10 micrometers

Can see consisten Voigts's discontinuity across samples. Proximal and distal raphe ends swing unilaterally. 3rd image has two valves semi-open. Does not match a current caloneis species on Diatoms.org

Caloneis schumanniana - Photo (c) peripaige, some rights reserved (CC BY-NC)
sylviaslee's ID: Caloneis schumanniana, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 15, 2023
Leading

Photos / Sounds

Observer

pliebrecht

Date

June 9, 2023 03:49 PM CDT

Description

slide 2023-76, Ricciocarpus from Pilot Knob

Stria density varies from center to apices. Valve faces are irregular.

Eunotia bilunaris - Photo (c) Karolina Fucikova, some rights reserved (CC BY-NC), uploaded by Karolina Fucikova
sylviaslee's ID: Eunotia bilunaris, a member of Diatoms (Class Bacillariophyceae)
Added on June 15, 2023
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Photos / Sounds

Observer

pliebrecht

Date

May 24, 2023 03:22 PM CDT

Description

slide 2023-18 Epipelon from silver lake fen (pond)

Has less protracted valve ends than capitata. Biseriate striae stand out in appearance.

Hippodonta hungarica - Photo (c) caraujo2016, some rights reserved (CC BY-NC)
sylviaslee's ID: Hippodonta hungarica, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 15, 2023
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Photos / Sounds

Observer

pliebrecht

Date

May 30, 2023 03:25 PM CDT

Description

slide 2023-45
Piston Core (0-1cm)
Little Miller's Bay
scale bar 10µm

image 3 is tilted for view of the raphe along the valve margin.

Valves asymmetric to the transapical axis, one side is more pointed and the other is more rounded. The raphe canals are very visible.

the valve margin contains 7-8 ribs/ 50 µm, the striae are not visible at 100x magnification

Iconella splendida - Photo (c) thrashii, some rights reserved (CC BY-NC), uploaded by thrashii
sylviaslee's ID: Iconella splendida, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 15, 2023
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Photos / Sounds

Observer

pliebrecht

Date

May 24, 2023 05:35 PM CDT

Description

slide 2023-19
Silver Lake Fen, High Flark, periphyton

Can see striae between costae. Central notches are not present.

Scale bar= 10µm

Epithemia gibberula - Photo Charles Sumner Boyer (1856-1928)., no known copyright restrictions (public domain)
sylviaslee's ID: Epithemia gibberula, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 15, 2023
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Photos / Sounds

Observer

hanna_37

Date

September 15, 2022 04:25 PM EDT

Description

These specimen came from the Kissimmee river. The valves are very small and ovoid with broadly rounded apices. Compared to Staurosirella lapponica, my specimen are too small. According to KLB 2/3 lapponica are 10-30µm long and my specimen range from 5-7µm long. This species was also described in a nearby county, Palm Beach County, in the Stoermer et al. 1992 study.

Staurosira construens - Photo (c) khatcher, some rights reserved (CC BY-NC), uploaded by khatcher
sylviaslee's ID: Staurosira construens, a member of Diatoms (Class Bacillariophyceae)
Added on June 15, 2023
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Photos / Sounds

Observer

pliebrecht

Date

May 24, 2023 04:54 PM CDT

Description

slide 2023-19
Periphyton from Silver Lake Fen High Flark

scale bar 10µm

Image 2 includes a semi-attached frustule.

Fibulae density is 7 per 10µm

Central nodule is visible. Width is 5-6, which is a larger value than what is on Diatoms of North America reference.

Nitzschia amphibia - Photo (c) emassa, some rights reserved (CC BY-NC)
sylviaslee's ID: Nitzschia amphibia, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 15, 2023
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Observer

hanna_37

Date

September 15, 2022 02:14 PM EDT

Description

These came form a periphyton sample in the Kissimmee river. Valves are elliptical lanceolate with truncate to broadly rounded apices. They have a distinct sinus or horseshoe shaped depression with a flap of silica over creating a double horseshoe.

Planothidium frequentissimum - Photo (c) aedrahos, some rights reserved (CC BY-NC)
sylviaslee's ID: Planothidium frequentissimum, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 14, 2023
Supporting

Photos / Sounds

Observer

hanna_37

Date

July 9, 2022 03:51 PM MDT

Description

These specimen came from South Boulder creek. Their valves are elliptic lanceolate with broadly rounded apices. As the specimen get bigger they have more sub-rostrate ends. They have distinct costae and very thin striae.

cf. mesodon

Odontidium - Photo (c) Lane Allen, some rights reserved (CC BY-NC), uploaded by Lane Allen
sylviaslee's ID: Genus Odontidium, a member of Diatoms (Class Bacillariophyceae)
Added on June 14, 2023
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Observer

hanna_37

Date

September 15, 2022 04:17 PM EDT

Description

These specimen are from periphyton in the Kissimmee river. Their valves are linear-lanceolate with ghost striae in the central area. They also have rimoportula process on both apices. Unlike Fragilaria they don't have spines.

sp. goulardii

Synedra goulardii - Photo (c) Natalia Pucheta, some rights reserved (CC BY-NC), uploaded by Natalia Pucheta
sylviaslee's ID: Synedra goulardii, a member of Diatoms (Class Bacillariophyceae)
Added on June 14, 2023
Leading

Photos / Sounds

Observer

andrew-burgess

Date

May 22, 2023 02:22 PM CDT

Description

Cylindrical frustules are seen joined face-to-face. Circular areolae form striae that appear to curve to the right. Thickly silicified valves appear to have resulted from a narrow microscope aperture when capturing, giving it the appearance of a thicker valve than the species' DONA page.
DONA measurements report a diameter range from 4-17 µm.

Aulacoseira granulata - Photo (c) lindsey_scarlson, some rights reserved (CC BY-NC)
sylviaslee's ID: Aulacoseira granulata, a member of Diatoms (Class Bacillariophyceae)
Added on June 14, 2023
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Observer

andrew-burgess

Date

June 25, 2022

Description

Valves are apically and transapically symmetrical and are linear with capitate ends. Primary and secondary costae are both visible. Individual areolae are unresolvable in LM.

Meridion anceps - Photo (c) Lane Allen, some rights reserved (CC BY-NC), uploaded by Lane Allen
sylviaslee's ID: Meridion anceps, a member of Diatoms (Class Bacillariophyceae)
Added on June 14, 2023
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Observer

afifo

Date

June 9, 2023 10:39 AM CDT

Description

Little Sioux River
Sample type: Epipelon
Scale bar=10µm
These specimen are in girdle views

Reference:
Stepanek, J., Kociolek, P. (2011). Amphora copulata. In Diatoms of North America. Retrieved June 13, 2023, from https://diatoms.org/species/amphora_copulat

Amphora copulata - Photo (c) emassa, some rights reserved (CC BY-NC)
sylviaslee's ID: Amphora copulata, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 14, 2023
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Photos / Sounds

Observer

afifo

Date

June 10, 2023 05:04 PM CDT

Description

Grove Lake
Sample type: Zygnemetales Epiphytes
Scale bar: 10µm
Reference: Morales, E. (2010). Staurosirella leptostauron. In Diatoms of North America. Retrieved June 13, 2023, from https://diatoms.org/species/staurosirella_leptostauron

Staurosira leptostauron - Photo (c) aedrahos, some rights reserved (CC BY-NC)
sylviaslee's ID: Staurosira leptostauron, a member of Diatoms (Class Bacillariophyceae)
Added on June 14, 2023
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Photos / Sounds

Observer

hanna_37

Date

May 26, 2023 01:09 PM CDT

Description

These specimen came from an epidendron sample from a stream on the North 40 trail. The valves are lunate shaped with convex dorsal margins. The apices are bent towards the dorsal side with a protracted and rounded shape. The raphe is on the dorsal side right next to the mantle. My samples have a breadth width that is 0.7µm wider than the reference samples, but all other measurements and descriptions are similar.

Slide 23-36

Rhopalodia gibberula var. vanheurckii

Rhopalodia gibberula vanheurckii - Photo (c) hanna_37, some rights reserved (CC BY-NC)
sylviaslee's ID: Rhopalodia gibberula ssp. vanheurckii, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 12, 2023
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Photos / Sounds

Observer

pliebrecht

Date

May 28, 2023 03:18 PM CDT

Description

slide 2023-76 Ricciocarpus from Pilot Knob

Each of these is the rapheless valve with a rimmed depression.

Image 1 shows the valve from the underside.

Planothidium lanceolatum - Photo (c) Stephanie Robson, some rights reserved (CC BY-NC), uploaded by Stephanie Robson
sylviaslee's ID: Planothidium lanceolatum, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 12, 2023
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Photos / Sounds

Observer

afifo

Date

June 9, 2023 01:30 PM CDT

Description

Silver Lake Fen- High Fark
Sample type: Surface biofilm
Scale bar: 10µm
Reference; Kociolek, P. (2011). Nitzschia amphibia. In Diatoms of North America. Retrieved June 09, 2023, from https://diatoms.org/species/nitzschia_amphibia

Nitzschia amphibia - Photo (c) emassa, some rights reserved (CC BY-NC)
sylviaslee's ID: Nitzschia amphibia, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 12, 2023
Supporting

Photos / Sounds

Observer

hanna_37

Date

May 24, 2023 02:23 PM CDT

Description

These specimen are from a phytoplankton tow in Silver lake. These are centric diatoms with cylindrical frustules. They have prominent coarse, slightly diagonal areolae on their mantle. The 3rd and 4th pictures show their long separation spines. My specimen differ from the var. ambigua because ambigua have 17-22 areolae/10µm and my specimen have 12 areolae/10µm.

Slide 23-23

Aulacoseira granulata - Photo (c) lindsey_scarlson, some rights reserved (CC BY-NC)
sylviaslee's ID: Aulacoseira granulata, a member of Diatoms (Class Bacillariophyceae)
Added on June 12, 2023
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Photos / Sounds

Observer

afifo

Date

June 9, 2023 02:27 PM CDT

Description

Silver Lake Fen _High Fark
Sample type: Surface Biofilm
Scale bar =10µm

These specimen are species complex around Gophonema angustum, G. vibrio, G. dichotomum/G. intricatum aligning to the G. vibrio more.

Reference:
Krammer, K., & Lange-Bertalot, H. (2004). Achnanthaceae: Kritische ergänzungen zu achnanthes s.l., Navicula s.str., Gomphonema. Spektrum. : Gomphonema vibrio cf.

Spaulding, S., Edlund, M. (2009). Gomphonema. In Diatoms of North America. Retrieved June 11, 2023, from https://diatoms.org/genera/gomphonema

Gomphonema - Photo (c) sydski, some rights reserved (CC BY-NC)
sylviaslee's ID: Genus Gomphonema, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 12, 2023
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Observer

jdepa

Date

June 2, 2023 09:03 AM AKDT

Description

scale bar = 10µm
Observed in ~2600-yr-old core sample sediments from a coastal lagoon on Montague Island, Prince William Sound, Alaska.

Now Stephanocyclus meneghiniana.
Distinctive chambered striae around the margin (generally 7-8/10µm).
In two of the images, the central fultoportulae are visible. This species usually contains 1-4.

Cyclotella meneghiniana - Photo (c) Stephanie Robson, some rights reserved (CC BY-NC), uploaded by Stephanie Robson
sylviaslee's ID: Cyclotella meneghiniana, a member of Diatoms (Class Bacillariophyceae)
Added on June 12, 2023
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Observer

jdepa

Date

June 4, 2023 01:14 PM AKDT

Description

scale bar = 10µm

Monoraphid diatom species with both a raphe and rapheless valve.
Valves are elliptical.
Raphe valves feature a central raphe and an intricately decorated valve circumference. They contain a thicker transapical gap in the striae at the valve center. Rapheless valves feature a central, linear sternum. Striae are biseriate, parallel and slightly radiate at the apices.

Cocconeis costata - Photo (c) Jessica DePaolis, some rights reserved (CC BY-NC), uploaded by Jessica DePaolis
sylviaslee's ID: Cocconeis costata, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 12, 2023
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Photos / Sounds

Observer

jdepa

Date

May 22, 2023 09:00 AM CDT

Description

scale bar = 10µm

Valves are narrow and linear with rostrate to subcapitate apices. Striae are straight and alternate. There is a narrow linear central axial area. In smaller specimen there is an asymmetric central gap in the center of the valve, and in larger specimen there is a larger gap with ghost striae visible.

Another reference: Morales, E. (2010). Fragilaria vaucheriae. In Diatoms of North America. Retrieved June 12, 2023, from https://diatoms.org/species/fragilaria_vaucheriae

Fragilaria vaucheriae - Photo (c) Kelsey Solomon, some rights reserved (CC BY-NC), uploaded by Kelsey Solomon
sylviaslee's ID: Fragilaria vaucheriae, a member of Diatoms (Class Bacillariophyceae)
Added on June 12, 2023
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Observer

jdepa

Date

May 25, 2023 02:18 PM CDT

Description

scale bar = 10µm

Valves are bent at the central node creating asymmetry along the apical axis. Apices are rostrate to capitate, protracted, and bend slightly to the dorsal side. Fibulae are present and spaced unevenly along the ventral side of the valve. Valves can be quite large (~150µm) however the specimen pictured here range from 61-72µm.

Hantzschia amphioxys - Photo (c) jrarick, some rights reserved (CC BY-NC), uploaded by jrarick
sylviaslee's ID: Hantzschia amphioxys, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 12, 2023
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Observer

pliebrecht

Date

May 22, 2023 05:18 PM CDT

Description

Ventral margin is slightly convex. Distal raphe ends are deflected ventrally. Benthic, and found in the Triboji Marina and is epiphytic.

https://diatoms.org/species/encyonema_lange-bertalotii

Encyonema lange-bertalotii - Photo (c) Megan Powers, some rights reserved (CC BY-NC), uploaded by Megan Powers
sylviaslee's ID: Encyonema lange-bertalotii, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 12, 2023
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Observer

jdepa

Date

June 6, 2023 08:02 AM CDT

Description

scale bar = 10µm

Apices are angled towards the ventral side of the valve. The striae density/10µm is slightly lower for my specimen than what is recorded in the original description (see reference). Proximal raphe ends deflect slightly to the dorsal side.

Encyonema lange-bertalotii - Photo (c) Megan Powers, some rights reserved (CC BY-NC), uploaded by Megan Powers
sylviaslee's ID: Encyonema lange-bertalotii, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 12, 2023
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Observer

jdepa

Date

June 2, 2023 10:27 AM AKDT

Description

scale bar = 10µm

Observed in ~2600 yr-old marsh sediments.

This was difficult to identify. I used the book "Diatoms in Alaska" for reference where they provide an image (fig. 2 in Plate XLV) that does not contain the gap in striae on the central dorsal valve. They called this Amphora ovalis. The smaller specimen for A. ovalis on diatoms.org (cited below) do not have the gap, but larger specimen do. However, a large difference in my specimen vs. Amphora ovalis is the raphe shape towards the proximal raphe ends. In A. ovalis they curve intensely toward the dorsal valve but that curvature is missing in my samples.

This is likely not A. ovalis.

Stepanek, J., Kociolek, P. (2011). Amphora ovalis. In Diatoms of North America. Retrieved June 12, 2023, from https://diatoms.org/species/amphora_ovalis

Amphora - Photo (c) Proyecto Agua, some rights reserved (CC BY-NC-SA)
sylviaslee's ID: Genus Amphora, a member of Raphid Diatoms (Subclass Bacillariophycidae)
Added on June 12, 2023
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