Green Algae

Click the image numbers below to view the photographs:


Image Caption
MO1000 Members of genus Vorticella represent one of the most impressive groups within the Protozoa. They occur in nature as single organisms as well as in colonies looking like a bunch of flowers. They are ubiquitous in freshwater and seawater habitats where their favorite food, bacteria, occurs in high concentrations.More than a hundred species of Vorticella are recognised.
MO1001 .Vaginicola sp. feeding on bacteria, the complex pattern of ciliary movement creates a vortex in the water like a propeller.
MO1002 Phase contrast photomicrograph of Paramecium bursaris, showing the algal endosymbiont Chlorella sp living within the cytoplasm.
MO1003 Plankton bloom of the Ciliate Spirostomum sp. in garden pond in late summer, the indevidual cells are clumping together due to raised oxygen levels after increased photosynthesis from aquatic plants during a hot sunny day, it has been noted that microrganisms react quickly to changing gas gradients, and this clumping behaviour is possibly an ancient response that evolved during the mesoproterozoic era.
MO1004 Phase contrast image of Euplotes sp..
MO1005 Unidentified ciliate phase contrast length: 50 microns

Interference Contrast photomicrograph of unidentified Ciliate containing ingested Euglenoids.


Green Algae

Image Caption
MO2000 Naviculoid diatom frustule.
MO2001 Mixture of centric and pennate diatom frustules, cleaned and mounted for microscopy.
MO2002 Large centric diatom
MO2003 Diatom frustule made of silica
MO2004 Photomicrograph of valve view of the centric diatom Actinoptychus senarius Ehrenberg 1843. Diatoms are extremely abundant in freshwater and marine ecosystems, it is estimated that 20% to 25% of all organic carbon fixation on the planet is carried out by diatoms.Diameter approximately 100 micrometres,imaged using differential interference contrast.
MO2005 Diatom
MO2006 Photomicrograph of Volvox sp,each mature Volvox colony is composed of numerous flagellate cells similar to Chlamydomonas


Image Caption
MO3000 Nostoc sp. is a nitrogen-fixing cyanobacterium, consisting of chains of cells supended in a gelatinous matrix. Nostoc species are widely distributed in illuminated portions of the biosphere, including fresh waters and tropical, temperate and polar terrestrial systems.
MO3001 Cyanobacteria also known as Blue Green Algae are sometimes considered to be photosynthetic bacteria having evolved during the Mesoproterozoic era approximately 3.5 billion years ago. They are credited with converting the earths atmosphere from a reducing atmosphere to an oxidising one. This enabled new life forms to evolve which required free oxygen. The image shows strings of cells of Nostoc, a common blue green alga. The larger cells are heterocysts which are Nitrogen fixing. This sample is beginning to decompose hence visible bacteria. Phase Contrast illumination, approximate magnification x500.
MO3002 Chains of prokaryotic cells of Nostoc sp, the large central cell is a heterocyst, a specialised cell for fixing Nitrogen. Magnification about 1000x Differential Interference Contrast
MO3003 Macro photograph of Nostoc sp forming irregular colonies in temporary water pocket in limeestone pavement, Burren, Western Ireland, average diameter of colonies about 1 centimetre.
MO3004 Nostoc colonies on soil surface at the Burren, Western Ireland.
MO3005 Oscillatoria sp (Vaucher) This genus is well known for its motility, trichomes being able to glide apparently by means of wave movements of microfibrils, so long as the cells are in contact with a solid substrate. Mucilage is secreted through pores in the cell walls and may help to provide better contact with the substrate surface. Movement has been timed at up to 11 µm per second (van den Hoek et al., 1995).


Image Caption
MO4000 Hypsibius dujardini (Doyere 1840)
MO4001 A colonial Rotifer Conochilus hippocrepis (Schrank 1830) dark field photomicrograph. The colony is about a millimetre in diameter and was found at Littlewick ponds, Surrey
MO4002 Colonial Rotifers Conochilus hippocrepis (Schrank 1830) The colonies are about a millimetre in diameter and were found at Littlewick ponds, Surrey
MO4003 Photomicrograph of a Gastrotrich Chaetonotus sp. phase contrast illumination.
MO4004 Photomicrograph of a Gastrotrich swimming between algal filaments magnification about 500x using Nomarski Interference Contrast illumination.
MO4005 A large Gastrotrich from the River Teifi in West Wales. The name means "hairy stomach" as the ventral surface is covered in cilia which allow it to glide smoothly over objects such as algal filaments. They are transparent microscopic creatures which range in size from approximately 0.1mm -, there are about 400 species known to science.
MO4006 Rotifers of the genus Collotheca use five tufts of relatively long tentacle-like cilia known as setae, surrounding the very large corona. Most rotifers possess chitinous jaws called trophi that are used for grinding ingested food. Often only the trophi are found as fossils, and the oldest, embedded in amber, date them to the Eocene epoch (38 to 55 million years ago).



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