Antique engraved illustration of the hydra. Vintage illustration of the hydra. Old engraved picture. Longitudinal cross section of the hydra. Book illustration published 1907. Hydra has a tubular, radially symmetric body up to 10 mm ( in) long when extended, secured by a simple adhesive foot known as the basal disc. Gland cells in the basal disc secrete a sticky fluid that accounts for its adhesive properties. At the free end of the body is a mouth opening surrounded by one to twelve thin, mobile tentacles. Each tentacle, or cnida (plural: cnidae), is clothed with highly specialised sting
Antique engraved illustration of the hydra. Vintage illustration of the hydra. Old engraved picture. Longitudinal cross section of the hydra. Book illustration published 1907. Hydra has a tubular, radially symmetric body up to 10 mm ( in) long when extended, secured by a simple adhesive foot known as the basal disc. Gland cells in the basal disc secrete a sticky fluid that accounts for its adhesive properties. At the free end of the body is a mouth opening surrounded by one to twelve thin, mobile tentacles. Each tentacle, or cnida (plural: cnidae), is clothed with highly specialised stinging cells called cnidocytes. Cnidocytes contain specialized structures called nematocysts, which look like miniature light bulbs with a coiled thread inside. At the narrow outer edge of the cnidocyte is a short trigger hair called a cnidocil. Upon contact with prey, the contents of the nematocyst are explosively discharged, firing a dart-like thread containing neurotoxins into whatever triggered the release. This can paralyze the prey, especially if many hundreds of nematocysts are fired.
Size: 2464px × 2628px
Location: WORLDWIDE
Photo credit: © Roman Nerud / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1800, 1800s, 19th, age, aged, ancient, animal, antique, antiquity, archival, archive, art, artwork, book, books, century, cnidaria, cultural, culture, drawing, engraved, engraving, fauna, fine, graphic, heritage, historic, historical, history, hydroid, hydrozoa, illustration, image, images, natural, picture, print, structure, vintage, wildlife, xix, zoology
