Freshwater Hydra Zoological Poster - Hydra oligactis/Hydra viridissima

The Science:

The Hydra is a small, common freshwater predator related to Coral, Sea Anemones and Jellyfish. Found in ponds, streams and other slow-moving bodies of fresh water, it attaches itself to plants, rocks or other objects, and hunts small invertebrates using its tentacles, paralyzing and killing them using Nematocysts, the stinging structures common to Cnidaria. Shown are a Brown Hydra extended (catching Daphnia) and retracted, a Green Hydra, details of the structure of the Hydra, including sectional views of the body, the network of ectodermal nerve cells, and the stinging cell, both ready and discharged. At the bottom are shown methods of locomotion. This is one of a wonderful series of Scientific German Educational Charts, created in the 1950s and 60s and still produced by the original printer, internationally recognized for producing educational science charts since 1929. These charts are issued today using the original film and same methods as the first printing. They are printed without inscription for both classroom study and decorative purposes, with special attention paid to botanical detail and scientific accuracy.

The Story:

Mounted on linen canvas stretched on wooden rods for display, each measures 44.5 inches tall by 32.25 inches wide (85 cm x 120 cm), and comes with a nylon cord strung through the top wooden rod for easy hanging. Each comes securely rolled and will be shipped to you in a sturdy mailing tube. These lovely botanical posters are large, colorful and impressive pieces of science decor. Add a touch of vintage classroom style to your home today!

DETAILS

SKU: HD-PO0064
Dimensions: 36"W x 46.5"H
Scientific Name: Hydra oligactis/Hydra viridissima
Origin: Germany
Material: Linen backed canvas
Shipping Restrictions: None.