Early 20th Century British Microscope (circa 1900)


Galleria
License Info
Image Use
Custom Photos
Partners
Site Info
Contact Us
Publications
Home

The Galleries:

Photo Gallery
Silicon Zoo
Pharmaceuticals
Chip Shots
Phytochemicals
DNA Gallery
Microscapes
Vitamins
Amino Acids
Birthstones
Religion Collection
Pesticides
BeerShots
Cocktail Collection
Screen Savers
Win Wallpaper
Mac Wallpaper
Movie Gallery
 

Spike (M.I.) Walker

Rotifer (Synchaeta grandis)

English photomicrographer Spike (M.I.) Walker has been a consistent winner of the Nikon Small World competition for many years and has published many articles and a book about microscopy. Featured below is a photomicrograph of a living rotifer specimen taken with DIC illumination.

Rotifer (Synchaeta grandis)

Photomicrograph of Synchaeta grandis. This rotifer was photographed during a field course, using a 16x/0.35 NA planachromat objective and Nomarski DIC condenser on a Zeiss GFL stand. A Zeiss microflash unit was used to obtain the 0.5 millisecond exposure. Photographed with Fujichrome Velvia. (50x)

Discovered in the late 1600s by Antoni van Leeuwenhoek, rotifers were originally called "wheel animalcules" or wheel animals because their coronas look like turning wheels. This appearance is caused by rippling (metachronal) waves of tiny beating cilia that draw food into their mouths and provide a means of locomotion. Rotifers are the smallest multicellular animals and occur worldwide in primarily freshwater habitats. Nearly all rotifers have chitinous jaws called trophi that grind and shred food. The trophi are the only part of a rotifer that can be fossilized and have been found in amber dating back to the Eocene epoch (38-55 million years ago).

Many rotifer species have no males, females producing only females (parthenogenesis). In some rotifer species, stress can cause females to produce eggs that hatch as males. They have no mouth or digestive tract and die within hours or days. The appearance of males is followed by sexual reproduction. The females then produce resting eggs, which settle to the bottom to hatch when conditions permit. The tiny eggs can withstand desiccation for considerable periods of time and can be carried by wind or birds to any place that holds water (even bird baths and gutters) where they will hatch.

BACK TO SPIKE WALKER GALLERY

Questions or comments? Send us an email.
Text and graphics for this article are
© 2000-2013 by Spike (M. I.) Walker.
All Rights Reserved under copyright law.
© 1995-2013 by Michael W. Davidson and The Florida State University. All Rights Reserved. No images, graphics, software, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders. Use of this website means you agree to all of the Legal Terms and Conditions set forth by the owners.
This website is maintained by our
Graphics & Web Programming Team
in collaboration with Optical Microscopy at the
National High Magnetic Field Laboratory.
Last modification: Friday, Aug 01, 2003 at 11:42 AM
Access Count Since November 18, 2000: 13531
Microscopes provided by:
Visit the Nikon website. Visit the Olympus Microscopy Resource Center website.