Comments on: Hydra, a fresh-water polyp http://www.microbehunter.com/2009/01/17/hydra-a-fresh-water-polyp/ of Microscopy, Microbes and More Sun, 29 Jan 2012 20:12:04 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: denis fitt http://www.microbehunter.com/2009/01/17/hydra-a-fresh-water-polyp/comment-page-1/#comment-1635 denis fitt Sat, 26 Feb 2011 13:50:42 +0000 http://microscopy.okim.info/?p=938#comment-1635 to add- they will also continue to live even if cut in half as will parts grow into whole if cut. to add- they will also continue to live even if cut in half as will parts grow into whole if cut.

]]> By: Ian MacGregor http://www.microbehunter.com/2009/01/17/hydra-a-fresh-water-polyp/comment-page-1/#comment-1488 Ian MacGregor Fri, 17 Dec 2010 03:04:59 +0000 http://microscopy.okim.info/?p=938#comment-1488 Hydras are not sessile; far from it. They move by basal gliding like many of their marine cousins or, more often , by looping and somersaulting, attaching oral end and pedal disk alternately. Hydras, especially the green species, are positive to moderate light moving by random movements towards the lighted side of the aquarium. They are negative to bright light and move away from the light. Reference: Libby Hyman ( 1940 ) The Invertebrates; Volume 1 ( Protozoa through Ctenophora ) page. 492 Have a Hydra culture in your classroom ? Get the kids to design an experiment to test this statement and see for themselves. Regards: Ian MacGregor Burnaby, BC, Canada Hydras are not sessile; far from it. They move by basal gliding like many of their marine cousins or, more often , by looping and somersaulting, attaching oral end and pedal disk alternately. Hydras, especially the green species, are positive to moderate light moving by random movements towards the lighted side of the aquarium. They are negative to bright light and move away from the light.

Reference: Libby Hyman ( 1940 ) The Invertebrates; Volume 1 ( Protozoa through Ctenophora ) page. 492

Have a Hydra culture in your classroom ? Get the kids to design an experiment to test this statement and see for themselves.

Regards:
Ian MacGregor
Burnaby, BC, Canada

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