Hydra oligactis, also known as the brown Hydra, is a species of hydra found widely dispersed in the northern temperate zone. It is a common organism found in still waters from early Spring to late Autumn.
It is commonly found attached to the stems of water plants, the undersides of leaves , submerged twigs and on the surface of stones. When disturbed it retracts to a small brown blob which is easly overlooked. Gently sweeping through a clean weedy pond and allowing the collected water and leaves to stand in a jar will often reveal Hydra emerging after only a few minutes.
When in feeding mode, the fully extended tentacles are very long and may exceed 1 inch (25 mm) in length. In this condition the tentacles are very difficult to see with the naked eye and are often only revealed when a prey animal such as Daphnia is caught.
A fragmented metazoan organellar genome: the two mitochondrial chromosomes of Hydra magnipapillata.(Research article)
Jul 26, 2008; Authors: Oliver Voigt ; Dirk Erpenbeck ; Gert Wörheide (corresponding author) BackgroundMitochondria were most likely...
Immunocytochemically defined populations of neurons progressively increase in size through embryogenesis of Hydra vulgaris.
Aug 01, 2002; Introduction Cnidarian nervous systems are simple nervous systems with relatively few neurons and synapses (Grimmelikhuijzen et...