Icon
Photos / Sounds
Species / Taxon Name
Observer
Place
Actions

Photos / Sounds

Square

What

Rose-breasted Grosbeak Pheucticus ludovicianus

Observer

lamamark

Date

June 22, 2020 02:23 PM PDT

Description

Male rose breasted grosbeak--Pheucticus ludovicianus.

Has returned to the feeder for 30 days since the first sighting at this location.

Photos / Sounds

Square

Observer

lamamark

Date

January 20, 2019 08:19 AM PST

Description

p. 161-163. Cupp, E. E. (1943). Marine Plankton Diatoms of the West Coast of North America. Bull. Scrips. Inst. Oceanography. 5: 1-238.

pp. 91-93. Hoppenrath, M., Elbrachter, M., Drebes, G. (2009) Marine Phytoplankton, Selected microphytoplankton species from the North Sea around Helgoland and Sylt. pp. 45-46, figs. 18g-m. E. Schweizerbart’sche Verlagsbunchhandlung, Stuttgart, Germany.

p. 90. Horner, R. A. 2002. A Taxonomic Guide To Some Common Phytoplankton. Biopress Limited, Dorset Press, Dorchester, UK.

pp. 236-240. Hasle, G.R. & Syvertsen, E.E. (1996). Marine diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. 5-385. San Diego: Academic Press.

Photos / Sounds

Observer

lamamark

Date

January 24, 2005 11:57 AM PST

Description

Image of Trigonium. Likely T. arcticum. Valve view.

Basionym: Triceratium arcticum Brightwell

Specimen from plankton collected at the Spanish Hill wharf, North Galiano Island, Gulf Islands, British Columbia, Canada, January 24, 2005.

images of Trigonium arcticum (Brightwell) Cleve. Basionym: Triceratium arcticum Brightwell

References:

F.E. Round, F.E., Crawford, R.M. and Mann, D.G. (1990). The Diatoms, Biology & Morphology of the Genera. Cambridge University Press, Cambridge, UK. pp. 254-255.

Photos / Sounds

Observer

lamamark

Date

January 18, 2006 08:59 AM PST

Description

Possibly Cocconeis costata W.Gregory 1855.
https://www.algaebase.org/search/species/detail/?species_id=37569

P. 242. Plate XXI.; fig 7. Shim, J. H. (1976). Distribution and Taxonomy of Planktonic Marine Diatoms in the Strait of Georgia, B.C. Phd. Thesis, UBC.

Plate XV, 79. Tynni, R. (1986). Observations of diatoms on the coast of the state of Washington. Geological Survey of Finland, Report of Investigation 75.

Photos / Sounds

Square

Observer

lamamark

Date

January 11, 2006 07:15 PM PST

Description

Nitzschia longissima (Brébisson) Ralfs 1861.

https://www.algaebase.org/search/species/detail/?species_id=31041 M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 June 2020.

pp. 200-201. Cupp, E. E. (1943). Marine Plankton Diatoms of the West Coast of North America. Bull. Scrips. Inst. Oceanography. 5: 1-238.

pp. 324, 329, Plate 74. Hasle, G.R. & Syvertsen, E.E. (1997). Marine Diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. 90-93. San Diego: Academic Press.

p. 186, Plate 24. fig. 11. Shim, J. H. (1976). Distribution and Taxonomy of Planktonic Marine Diatoms in the Strait of Georgia, B.C. Phd. Thesis, UBC.

Photos / Sounds

Square

Observer

lamamark

Date

July 30, 2012 11:22 AM PDT

Description

Leptocylindrus minimus Gran 1915

LM image of the centric marine diatom Leptocylindrus minimus Gran 1915.

Phylum, Ochrophyta; Class, Bacillariophyceae; Subclass, Coscinodiscophycidae; Superorder, Chaetocerotanae; Order, Leptocylindrales; Family, Leptocylindraceae.

A genus with five currently accepted species: Leptocylindrus adriaticus Schroder; L. curvatus Skvortzov; L. danicus, L. mediterraneus (H. Peragallo) Hasle 1975; L. minimus Gran 1915. Elongated cylindrical cells with adjoining circular valve faces. Both L. minimus and L. danicus have a row of small marginal projections, flap-like (triangular) spines, with smaller ones in between (blister like markings-Round et al. 1990) that are found between the valve face and the mantle. Just outside of the annulus is an off center pore. Commonly forms straight or very slightly curved chains. Each cell has two elongated plate-like pale chloroplasts, occasionally one chloroplast. (L. danicus has many small pale chloroplasts). Cell diameter for L. danicus - 5-16 μm, 2-10 x longer than wide and for L. minimus - 1.5- 6 μm. Cells from the Heads at Akaroa Harbour range from 4.7 - 6.7 m with a pervalvar axis of 41-45 μm. Diameters in these cells correspond to L. minimus (2-3.3 micron) and they show two plate-like chloroplasts per cell. It is a planktonic and cosmopolitan marine diatom, though not yet reported from Antarctic and subantarctic waters.

20 micron net collection from surface waters in Porlier Pass, between Galiano Island and Valdes Island, Southern Gulf Islands, British Columbia, Canada. July 30, 2012.

Photos / Sounds

Square

Observer

lamamark

Date

January 19, 2006 01:52 PM PST

Description

Pleurosigma sp. W.Smith, 1852

pp. 196. Cupp, E. E. (1943). Marine Plankton Diatoms of the West Coast of North America. Bull. Scrips. Inst. Oceanography. 5: 1-238.

pp. 281-283. Plate 62, p. 277. Hasle, G.R. & Syvertsen, E.E. (1997). Marine Diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. 90-93. San Diego: Academic Press.

p. 176, Plate XXIII. Shim, J. H. (1976). Distribution and Taxonomy of Planktonic Marine Diatoms in the Strait of Georgia, B.C. Phd. Thesis, UBC.

P. 21. Plate XXV. Tynni, R. (1986). Observations of diatoms on the coast of the state of Washington. Geological Survey of Finland, Report of Investigation 75.

Photos / Sounds

Observer

lamamark

Date

November 27, 2007 09:15 AM PST

Description

Possibly Cocconeis costata W.Gregory 1855.
https://www.algaebase.org/search/species/detail/?species_id=37569

P. 242. Plate XXI.; fig 7. Shim, J. H. (1976). Distribution and Taxonomy of Planktonic Marine Diatoms in the Strait of Georgia, B.C. Phd. Thesis, UBC.

Plate XV, 79. Tynni, R. (1986). Observations of diatoms on the coast of the state of Washington. Geological Survey of Finland, Report of Investigation 75.

Photos / Sounds

Square

Observer

lamamark

Date

July 11, 2008 08:28 AM PDT

Description

Membraneis challengeri (Grunow) Paddock 1988 (Guiry et al. 2020)
Class: Bacillariophyceae, Subclass: Bacillariophycidae, Order: Naviculales, Family: Naviculaceae, Genus: Membraneis

SEM images of the more commonly used name Tropidoneis antarctica (Grunow) Cleve 1894 (Cupp 1943, Shim 1976, Horner 2002) and is considered a synonym for Membraneis challengeri. Basionym is Navicula challengeri (Hasle et al. 1996: pp. 286-287) https://www.algaebase.org/search/species/detail/?species_id=48736 .

Wendy Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 June 2020https://www.algaebase.org/search/species/detail/?species_id=44946

Specimen from a general plankton tow in Trincomali Channel, near Retreat Cove, Galiano Island, July 2008. Hitachi 4700 SEM, UBC BioImaging Facility. Many thanks to Elaine Humphrey for preparation and SEM assistance.

https://green2.kingcounty.gov/marine/Photo/Individual/1/403?photoId=814

pp. 197-198. Cupp, E. E. (1943). Marine Plankton Diatoms of the West Coast of North America. Bull. Scrips. Inst. Oceanography. 5: 1-238.

pp. 284-285. Hasle, G.R. & Syvertsen, E.E. (1997). Marine Diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. 90-93. San Diego: Academic Press.

p. 244a, fig. 15. Shim, J. H. (1976). Distribution and Taxonomy of Planktonic Marine Diatoms in the Strait of Georgia, B.C. Phd. Thesis, UBC.

Photos / Sounds

Square

Observer

lamamark

Date

July 14, 2005 04:35 AM PDT

Description

Membraneis challengeri (Grunow) Paddock 1988 (Guiry et al. 2020)
Class: Bacillariophyceae, Subclass: Bacillariophycidae, Order: Naviculales, Family: Naviculaceae, Genus: Membraneis

Tropidoneis antarctica (Grunow) Cleve 1894 is a more commonly used name (Cupp 1943, Shim 1976, Horner 2002) and is considered a synonym for Membraneis challengeri. Basionym is Navicula challengeri (Hasle et al. 1996: pp. 286-287) https://www.algaebase.org/search/species/detail/?species_id=48736 .

Wendy Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 June 2020. https://www.algaebase.org/search/species/detail/?species_id=44946

pp. 197-198. Cupp, E. E. (1943). Marine Plankton Diatoms of the West Coast of North America. Bull. Scrips. Inst. Oceanography. 5: 1-238.

pp. 284-285. Hasle, G.R. & Syvertsen, E.E. (1997). Marine Diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. 90-93. San Diego: Academic Press.

p. 244a, fig. 15. Shim, J. H. (1976). Distribution and Taxonomy of Planktonic Marine Diatoms in the Strait of Georgia, B.C. Phd. Thesis, UBC.

Photos / Sounds

Observer

lamamark

Date

November 19, 2008 07:05 AM PST

Description

Tropidoneis lepidoptera (Grunow) Cleve 1894
Class: Mediophyceae, Subclass: Lithodesmiophycidae, Order: Lithodesmidales, Family: Lithodesmiaceae, Genus: Tropidoneis

Light microscopic image of Tropidoneis lepidoptera. T. lepidoptera is a synonym of Plagiotropis lepidoptera (W.Gregory) Kuntze according to https://www.algaebase.org/search/species/detail/?species_id=39946

Baker, A.L. et al.  2012.  Phycokey -- an image based key to Algae (PS Protista), Cyanobacteria, and other aquatic objects. University of New Hampshire Center for Freshwater Biology. http://cfb.unh.edu/phycokey/Choices/Bacillariophyceae/Pennate/biraphes/biraphe_unicells/biraphe_unicells_symmetric/PLAGIOTROPIS/Plagiotropis_Image_page.html

pp. 197. Cupp, E. E. (1943). Marine Plankton Diatoms of the West Coast of North America. Bull. Scrips. Inst. Oceanography. 5: 1-238.

pp. 288-289. Hasle, G.R. & Syvertsen, E.E. (1997). Marine Diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. 90-93. San Diego: Academic Press.

p. 588-589. Round, F. E., Crawford, R. M. and Mann, D. G. (1990), The Diatoms, Biology & Morphology of the Genera, p. 142-142. Cambridge University Press, Cambridge, UK.

Photos / Sounds

Square

Observer

lamamark

Date

January 22, 2006 05:46 PM PST

Description

Likely the marine diatom Diploneis bombus. Will require cleaned valves and SEM images. There are 215 species accepted taxonomically by: https://www.algaebase.org/search/genus/detail/?genus_id=43699&sk=0.

Possibly Diploneis vetula (A.W.F.Schmidt) Cleve 1894. Shim (1976). Marine Planktonic Diatoms of the Straight of Georgia. Phd. Thesis. UBC.

Diploneis bombus: p. 59. Planche (plate) 50 p. 121. Bérard-Therriault, L., Poulin, M. & Bossé, L. (1999). Guide d'identification du phytoplancton marin de l'estuaire et du Golfe du Saint-Laurent incluant également certains protozoaires. Publication Spéciale Canadienne des Sciences Halieutiques et Aquatiques 128: 1-387.

Photos / Sounds

Observer

lamamark

Date

July 26, 2010 01:45 PM PDT

Description

Light micrograph of the marine diatom Achnanthes subconstricta (Meister) Toyoda. Basionym: Achnanthes javanica var. subconstricta Meister 1932. Note marginal ridge and prominent spines on both terminal ends. From a general plankton net tow, Spot Light Cove, Galiano Island, BC, Canada.

References:

Lee, S. D., et al. (2013). Taxonomic study of the genus Achnanthes (Bacillariophyta) in Korean coastal waters. J. Ecol. Environ. 36(4): 1-16.

Toyoda, K., Nagumo, T., Osada, K. & Tanaka, J. (2003). Morphological investigations of Achnanthes javanica Grunow and A. subconstricta (Meister) comb. nov.. Diatom Research 18(2): 365-375.

Photos / Sounds

Observer

lamamark

Date

July 21, 2006 05:56 PM PDT

Description

Images are likely of Achnanthes longipes C.Agardh 1824 which is a synonym of Achnanthes armillaris (O.F.Müller) Guiry (https://www.algaebase.org/search/species/detail/?species_id=30895).

p. 192. Cupp, E. E. (1943). Marine Plankton Diatoms of the West Coast of North America. Bull. Scrips. Inst. Oceanography. 5: 1-238.

pp. 106-109 Hoppenrath, M., Elbrächter, M. & Drebes, G. (2009). Marine phytoplankton Selected microphytoplankton species from the North Sea around Helgoland and Sylt. pp. [1]-264, figs 1-87. Stuttgart: E. Schweizerbart'sche Verlagsbuchhandlung.

Photos / Sounds

Observer

lamamark

Date

July 21, 2006 02:00 PM PDT

Description

pp. 295-305. Hasle, G.R. & Syvertsen, E.E. (1996). Marine Diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. table 10-p. 68, p.70. San Diego: Academic Press.

Photos / Sounds

Observer

lamamark

Date

July 25, 2006 05:57 AM PDT

Description

Possibly a variety of Fragilaria crotonensis. See: p. 181. Cupp, E. E. (1943). Marine Plankton Diatoms of the West Coast of North America. Bull. Scrips. Inst. Oceanography. 5: 1-238.

Photos / Sounds

Square

Observer

lamamark

Date

January 15, 2006 09:09 PM PST

Description

LM image of the marine diatom Thalassionema nitzschioides (Grunow). N. frauenfeldii has a prominent apical spine spine and the differences in marginal ornamentation distinguishes N. frauenfeldii from N. nitzschioides.

General plankton tow in Trincomali Channel, Galiano island, B.C., Canada.

pp. 257-261. Hasle, G.R. & Syvertsen, E.E. (1996). Marine Diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), p. 58. Plate 5, p. 55. San Diego: Academic Press.

pp. 106-107. Hoppenrath, M., Elbrachter, M., Drebes, G. (2009) Marine Phytoplankton, Selected microphytoplankton species from the North Sea around Helgoland and Sylt. pp. 59, figure 5. Plate 24, page 58:fig. f-k. E. Schweizerbart’sche Verlagsbunchhandlung, Stuttgart, Germany.

Photos / Sounds

Observer

lamamark

Date

July 19, 2006 09:12 AM PDT

Description

SEM images of the marine diatom Thalassionema nitzschioides (Grunow). N. frauenfeldii has a prominent apical spine spine and the differences in marginal ornamentation distinguishes N. frauenfeldii from N. nitzschioides.

General plankton tow in Trincomali Channel, Galiano island, B.C., Canada. Hitachi 4700 SEM, BioImaging Facility, UBC. Many thanks to Elaine Humphrey for preparation and imaging assistance.

pp. 257-261. Hasle, G.R. & Syvertsen, E.E. (1996). Marine Diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), p. 58. Plate 5, p. 55. San Diego: Academic Press.

pp. 106-107. Hoppenrath, M., Elbrachter, M., Drebes, G. (2009) Marine Phytoplankton, Selected microphytoplankton species from the North Sea around Helgoland and Sylt. pp. 59, figure 5. Plate 24, page 58:fig. f-k. E. Schweizerbart’sche Verlagsbunchhandlung, Stuttgart, Germany.

Photos / Sounds

Observer

lamamark

Date

January 24, 2007 08:45 AM PST

Description

pp. 106-107. Hoppenrath, M., Elbrachter, M., Drebes, G. (2009) Marine Phytoplankton, Selected microphytoplankton species from the North Sea around Helgoland and Sylt. pp. 59, figure 5. Plate 24, page 58:fig. f-k. E. Schweizerbart’sche Verlagsbunchhandlung, Stuttgart, Germany.

Photos / Sounds

Observer

lamamark

Date

January 8, 2013 11:34 PM PST

Description

SEM images of Trigonium arcticum (Brightwell) Cleve. Basionym: Triceratium arcticum Brightwell

Valve view.

Specimen from plankton collected at Montague Harbour, Galiano Island, Gulf Islands, British Columbia, Canada, January 8, 2013. Hitachi 4800 SEM, Advanced Microscope Facility, UVIC. Many thanks to Elaine Humphrey for SEM assistance.

References:

F.E. Round, F.E., Crawford, R.M. and Mann, D.G. (1990). The Diatoms, Biology & Morphology of the Genera. Cambridge University Press, Cambridge, UK. pp. 254-255.

Photos / Sounds

Observer

lamamark

Date

January 27, 2011 10:16 AM PST

Description

Thalassiosira punctigera (Castracane) Hasle 1983

SEM images of the marine diatom Thalassiosira punctigera (Castracane) Hasle 1983. Phylum: Bacillariophycophyta, Subphylum: Bacillariophytina, Class: Mediophyceae, Order: Thalassiosirales, Family: Thalassiosiraceae. Girdle view. Thalassiosira cells are cylindrical to discoid and usually joined together in chains. In girdle view T. punctigera cells appear as low cylindrical discs with a convex, evenly shaped valve. Often, but not always, there are a few long occluded processes away from the valve margin (not a stable morphological characteristic). Cells from Trincomali Channel usually have 1-9 occluded processes, some cells in culture have none. A row of short strutted processes that exude chitinous threads are spaced close together just inside the margin. There is one long labiate process found just inside, towards the centre of the valve, from the marginal ring of strutted processes. The valve margin is ribbed. Areolae are small and close together (fasciculated). From a central strutted process a thin chitinous thread connects cells. Cells may be single (often in cultures) or in chains. Cell diameter is 40-186 µm (Hasle 1983:604). Over 100 recorded species in this genus, the vast majority are marine.

Abundant and commonly found in Trincomali Channel. Collected by net December 19, 2010 from a coastal plankton sample at Spanish Hills Wharf (N48˚ 59.688’, W123˚ 35.064’), Trincomali Channel, Galiano Island, Southern Gulf Islands, British Columbia, Canada. Single cells isolated December 19, 2010, grown in in HESNW growth media. Transferred on Jan. 23, 2011 to the Canadian Centre for the Culture of Microorganisms (CCCM) (culture #: SHW-Thal-056-) at the University of British Columbia, Vancouver. Hitachi 4700 SEM, BioImaging Facility, UBC. Many thanks to Elaine Humphrey for SEM imaging assistance.

References:

Hoppenrath, M., Elbrachter, M., Drebes, G. (2009) Marine Phytoplankton, Selected microphytoplankton species from the North Sea around Helgoland and Sylt. pp. 59, figure 5. Plate 24, page 58:fig. f-k. E. Schweizerbart’sche Verlagsbunchhandlung, Stuttgart, Germany.

Horner, R. A. (2002), A Taxonomic Guide to Some Common Marine Phytoplankton. p. 31. Biopress Ltd., Bristol.

Hasle, G.R. & Syvertsen, E.E. (1996). Marine Diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), p. 58. Plate 5, p. 55. San Diego: Academic Press.

Guiry, M.D. & Guiry, G.M. 2007, AlgaeBase version 4.2. World-wide electronic publication, National University of Ireland, http://algaebase.org, searched October 16, 2010.

F.E. Round, F.E., Crawford, R.M. and Mann, D.G. (1990). The Diatoms, Biology & Morphology of the Genera. Cambridge University Press, Cambridge, UK. pp. 132-133.

Hasle, G.R. (1983). Thalassiosira punctigera (Castr.) comb. nov., a widely distributed marine planktonic diatom. Nordic Journal of Botany 3: 593-608.

Fryxell, G.A. and Hasle, G.R. (1979). The genus Thalassiosira: species with internal extensions of the strutted processes. Phycologia. vol. 18 (4), 378-393.

Photos / Sounds

Observer

lamamark

Date

December 28, 2010 09:57 AM PST

Description

Thalassiosira punctigera (Castracane) Hasle 1983

LM images of the marine diatom Thalassiosira punctigera (Castracane) Hasle 1983. Phylum: Bacillariophycophyta, Subphylum: Bacillariophytina, Class: Mediophyceae, Order: Thalassiosirales, Family: Thalassiosiraceae. Girdle view. Thalassiosira cells are cylindrical to discoid and usually joined together in chains. In girdle view T. punctigera cells appear as low cylindrical discs with a convex, evenly shaped valve. Often, but not always, there are a few long occluded processes away from the valve margin (not a stable morphological characteristic). Cells from Trincomali Channel usually have 1-9 occluded processes, some cells in culture have none. A row of short strutted processes that exude chitinous threads are spaced close together just inside the margin. There is one long labiate process found just inside, towards the centre of the valve, from the marginal ring of strutted processes. The valve margin is ribbed. Areolae are small and close together (fasciculated). From a central strutted process a thin chitinous thread connects cells. Cells may be single (often in cultures) or in chains. Cell diameter is 40-186 µm (Hasle 1983:604). Over 100 recorded species in this genus, the vast majority are marine.

Abundant and commonly found in Trincomali Channel. Collected by net December 19, 2010 from a coastal plankton sample at Spanish Hills Wharf (N48˚ 59.688’, W123˚ 35.064’), Trincomali Channel, Galiano Island, Southern Gulf Islands, British Columbia, Canada. Single cells isolated December 19, 2010, grown in in HESNW growth media. Transferred on Jan. 23, 2011 to the Canadian Centre for the Culture of Microorganisms (CCCM) (culture #: SHW-Thal-056-) at the University of British Columbia, Vancouver.

References:

Hoppenrath, M., Elbrachter, M., Drebes, G. (2009) Marine Phytoplankton, Selected microphytoplankton species from the North Sea around Helgoland and Sylt. pp. 59, figure 5. Plate 24, page 58:fig. f-k. E. Schweizerbart’sche Verlagsbunchhandlung, Stuttgart, Germany.

Horner, R. A. (2002), A Taxonomic Guide to Some Common Marine Phytoplankton. p. 31. Biopress Ltd., Bristol.

Hasle, G.R. & Syvertsen, E.E. (1996). Marine Diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), p. 58. Plate 5, p. 55. San Diego: Academic Press.

Guiry, M.D. & Guiry, G.M. 2007, AlgaeBase version 4.2. World-wide electronic publication, National University of Ireland, http://algaebase.org, searched October 16, 2010.

F.E. Round, F.E., Crawford, R.M. and Mann, D.G. (1990). The Diatoms, Biology & Morphology of the Genera. Cambridge University Press, Cambridge, UK. pp. 132-133.

Hasle, G.R. (1983). Thalassiosira punctigera (Castr.) comb. nov., a widely distributed marine planktonic diatom. Nordic Journal of Botany 3: 593-608.

Fryxell, G.A. and Hasle, G.R. (1979). The genus Thalassiosira: species with internal extensions of the strutted processes. Phycologia. vol. 18 (4), 378-393.

Photos / Sounds

Observer

lamamark

Date

November 3, 2010 09:39 AM PDT

Description

Thalassiosira rotula Meunier 1910

LM (SEM) image of the marine diatom Thalassiosira rotula Meunier 1910. Phylum: Bacillariophycophyta, Subphylum: Bacillariophytina, Class: Mediophyceae, Order: Thalassiosirales, Family: Thalassiosiraceae. Girdle view. Thalassiosira cells are cylindrical to discoid and usually joined together in chains. In girdle view T. rotula cells appear as flattened discs with slightly rounded corners. Multiple chitinous threads between cells coming from the central strutted processes (variable number: 14-22 in these these SHW cells) at the central annulus. The valve face has delicate radial ribs, with strutted processes dispersed over the valve face and rows of marginal strutted processes. There is one small marginal labiate process. Many chloroplasts that are discoid and can appear distinctively square to rectangular in outline. Over 100 recorded species in this genus, the vast majority are marine.

Note: It is questionable whether T. rotula is currently a valid species name. Sar et al. (2011) argue that T. rotula and T. gravida (Cleve 1896) are conspecific and that T. rotula is a temperature and silica dependent morphotype and is a heterotypic synonym for T. gravida. (MW Feb 1-2012)

Collected by net October 19, 2010 from a coastal plankton sample at Spanish Hills Wharf (N48˚ 59.688’, W123˚ 35.064’), Trincomali Channel, Galiano Island, Southern Gulf Islands, British Columbia, Canada. Single cells isolated October 30, 2010, grown in in HESNW growth media. Transferred on Nov. 2, 2010 to the Canadian Centre for the Culture of Microorganisms (CCCM) (culture #: SHW-Thal-r-01) at the University of British Columbia, Vancouver.

References:

Sar, E.A., Sunesen, I., Lavigne, A. and Lofeudo, S. (2011) Thalassiosira rotula, a heterotypic synonym of Thalassiosira gravida: morphological evidence. Diatom Research. Vol. 26 (1), 109–119.

Hoppenrath, M., Elbrachter, M., Drebes, G. (2009) Marine Phytoplankton, Selected microphytoplankton species from the North Sea around Helgoland and Sylt. pp. 58, plate 24:fig. l-q., p.60. E. Schweizerbart’sche Verlagsbunchhandlung, Stuttgart, Germany.

Horner, R. A. (2002), A Taxonomic Guide to Some Common Marine Phytoplankton. fig. 12, p. 27. and p. 33. Biopress Ltd., Bristol.

Hasle, G.R. & Syvertsen, E.E. (1996). Marine Diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. table 10-p. 68, p.70. San Diego: Academic Press.

Guiry, M.D. & Guiry, G.M. 2007, AlgaeBase version 4.2. World-wide electronic publication, National University of Ireland, http://algaebase.org, searched October 16, 2010.

F.E. Round, F.E., Crawford, R.M. and Mann, D.G. (1990). The Diatoms, Biology & Morphology of the Genera. Cambridge University Press, Cambridge, UK. pp. 132-133.

Fryxell, G.A. and Hasle, G.R. (1979). The genus Thalassiosira: species with internal extensions of the strutted processes. Phycologia. vol. 18 (4), 378-393.

Photos / Sounds

Observer

lamamark

Date

December 22, 2012 09:18 AM PST

Description

p. 177. Cupp, E. E. (1943). Marine Plankton Diatoms of the West Coast of North America. Bull. Scrips. Inst. Oceanography. 5: 1-238.

p. 113. Kraberg, A., Baumann, M., & Dürselen, C-D. (2010). Coastal Phytoplankton :
Photo Guide for Northern European Seas. p. 71. Verlag Dr. F. Pfeil. Munchen.

Photos / Sounds

Observer

lamamark

Date

November 19, 2011 09:08 AM PST

Description

p. 177. Cupp, E. E. (1943). Marine Plankton Diatoms of the West Coast of North America. Bull. Scrips. Inst. Oceanography. 5: 1-238.

p. 113. Kraberg, A., Baumann, M., & Dürselen, C-D. (2010). Coastal Phytoplankton :
Photo Guide for Northern European Seas. p. 71. Verlag Dr. F. Pfeil. Munchen.

Photos / Sounds

Observer

lamamark

Date

February 25, 2005 09:00 AM PST

Photos / Sounds

Observer

lamamark

Date

December 16, 2009 08:38 AM PST

Description

pp. 157-158. Hasle, G.R. & Syvertsen, E.E. (1996). Marine Diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. table 10-p. 68, p.70. San Diego: Academic Press.

Photos / Sounds

Square

Observer

lamamark

Date

August 11, 2010 11:34 AM PDT

Photos / Sounds

Observer

lamamark

Date

July 19, 2005 07:44 AM PDT

Description

SEM image of the centric diatom Skeletonema sp., probably the species japonicum: has more than two chloroplasts, the junction of the IFPP (intercalary fultoportula process or the struted tubular processes) join in a 1:2 junction which shows up in this image as a zig-zag pattern, and the SEM images from the similar samples and location have been identified as S. japonicum.

From plankton collected in the Tincomali Channel, near north Galiano Island, Gulf Islands, near Vancouver, British Columbia, Canada, July 19, 2005. Hitachi 4700 SEM. Many thanks to Elaine Humphrey, BioImaging Facility, UBC.

Sarno, D., Kooistra, W.H.C.F., Medlin, L.K., Percopo, I. & Zingone, A. (2005). Diversity in the genus Skeletonema (Bacillariophyceae): II. An assessment of the taxonomy of S. costatum-like species, with the description of four new species. Journal of Phycology 41: 151-176.

Shevchenko, O.G., Ponomareva, A.A., Turanov, S.V. & Dutova, D.I. (2019). Morphological and genetic variability of Skeletonema dohrnii and Skeletonema japonicum (Bacillariophyta) from northwestern Sea of Japan. Phycologia 58(1): 95-107.

Photos / Sounds

Observer

lamamark

Date

April 25, 2020 06:56 AM PDT

Description

Isolated from a plankton tow at Spanish Hills wharf, April 25, 2020. A clone from an initial chain of 8 cells, grown in f/10 media. Images taken May 28 and June 7, 2020.

Hasle, G.R. & Syvertsen, E.E. (1996). Marine diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. 5-385. San Diego: Academic Press.

Hoppenrath, M., Elbrächter, M. & Drebes, G. (2009). Marine phytoplankton Selected microphytoplankton species from the North Sea around Helgoland and Sylt. pp. [1]-264, figs 1-87. Stuttgart: E. Schweizerbart'sche Verlagsbuchhandlung.

Horner, R. A. 2002. A Taxonomic Guide To Some Common Phytoplankton. Biopress Limited, Dorset Press, Dorchester, UK.

Feeds: Atom